1 | %'sub_background': substract background to an image series, used with series.fig |
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2 | %------------------------------------------------------------------------ |
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3 | % Method: |
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4 | %calculate the background image by sorting the luminosity of each point |
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5 | % over a sliding sub-sequence of 'nbaver_ima' images. |
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6 | % The luminosity value of rank 'rank' is selected as the |
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7 | % 'background'. rank=nbimages/2 gives the median value. Smaller values are appropriate |
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8 | % for a dense set of particles. The extrem value rank=1 gives the true minimum |
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9 | % luminosity, but it can be polluted by noise. |
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10 | % Organization of image indices: |
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11 | % The program is working on a series of images, |
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12 | % The processing can be done over groups of nbfield2 consecutive files in slices (parameter NbSlice) |
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13 | % In the mode 'volume', nbfield2=1 (1 image at each level)and NbSlice (=nbfield_j) |
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14 | % Else nbfield2=nbfield_j =nbre of images in a burst (j index) |
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15 | |
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16 | % function GUI_series_config=sub_background(Param) |
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17 | % |
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18 | %%%%%%%%%%% GENERAL TO ALL SERIES ACTION FCTS %%%%%%%%%%%%%%%%%%%%%%%%%%% |
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19 | %OUTPUT |
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20 | % GUI_series_config=list of options in the GUI series.fig needed for the function |
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21 | % |
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22 | %INPUT: |
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23 | % In run mode, the input parameters are given as a Matlab structure Param copied from the GUI series. |
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24 | % In batch mode, Param is the name of the corresponding xml file containing the same information |
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25 | % In the absence of input (as activated when the current Action is selected |
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26 | % in series), the function ouput GUI_series_config set the activation of the needed GUI elements |
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27 | % |
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28 | % Param contains the elements:(use the menu bar command 'export/GUI config' in series to see the current structure Param) |
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29 | % .InputTable: cell of input file names, (several lines for multiple input) |
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30 | % each line decomposed as {RootPath,SubDir,Rootfile,NomType,Extension} |
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31 | % .OutputSubDir: name of the subdirectory for data outputs |
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32 | % .OutputDir: directory for data outputs, including path |
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33 | % .Action: .ActionName: name of the current activated function |
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34 | % .ActionPath: path of the current activated function |
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35 | % .IndexRange: set the file or frame indices on which the action must be performed |
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36 | % .FieldTransform: .TransformName: name of the selected transform function |
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37 | % .TransformPath: path of the selected transform function |
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38 | % .TransformHandle: corresponding function handle |
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39 | % .InputFields: sub structure describing the input fields withfields |
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40 | % .FieldName: name of the field |
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41 | % .VelType: velocity type |
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42 | % .FieldName_1: name of the second field in case of two input series |
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43 | % .VelType_1: velocity type of the second field in case of two input series |
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44 | % .ProjObject: %sub structure describing a projection object (read from ancillary GUI set_object) |
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45 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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46 | |
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47 | |
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48 | function GUI_config=sub_background (Param,get_param) |
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49 | |
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50 | %% set the input elements needed on the GUI series when the action is selected in the menu ActionName |
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51 | if ~exist('Param','var') % case with no input parameter |
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52 | GUI_config={'NbViewMax';1;...% max nbre of input file series (default='' , no limitation) |
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53 | 'AllowInputSort';'off';...% allow alphabetic sorting of the list of input files (options 'off'/'on', 'off' by default) |
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54 | 'NbSlice';'on'; ...%nbre of slices ('off' by default) |
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55 | 'VelType';'off';...% menu for selecting the velocity type (options 'off'/'one'/'two', 'off' by default) |
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56 | 'FieldName';'off';...% menu for selecting the field (s) in the input file(options 'off'/'one'/'two', 'off' by default) |
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57 | 'FieldTransform'; 'off';...%can use a transform function |
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58 | 'ProjObject';'off';...%can use projection object(option 'off'/'on', |
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59 | 'Mask';'off';...%can use mask option (option 'off'/'on', 'off' by default) |
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60 | 'OutputDirExt';'.sback';...%set the output dir extension |
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61 | ''}; |
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62 | return |
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63 | end |
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64 | |
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65 | %%%%%%%%%%%% STANDARD PART (DO NOT EDIT) %%%%%%%%%%%% |
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66 | %% get input parameters, file names and indices |
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67 | % BATCH case: read the xml file for batch case |
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68 | if exist('get_param','var') && isequal(get_param,0) |
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69 | checkrun=-1; %the function is just used to define to complement the input parameters |
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70 | elseif ischar(Param) && ~isempty(find(regexp(Param,'.xml$'))) %batch mode |
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71 | Param=xml2struct(Param); |
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72 | checkrun=0; |
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73 | % RUN case: parameters introduced as the input structure Param |
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74 | else |
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75 | hseries=guidata(Param.hseries);%handles of the GUI series |
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76 | WaitbarPos=get(hseries.waitbar_frame,'Position');%position of the waitbar on the GUI series |
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77 | checkrun=1; % indicate the RUN option is used |
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78 | end |
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79 | % get the set of input file names (cell array filecell), and the lists of |
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80 | % input file or frame indices i1_series,i2_series,j1_series,j2_series |
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81 | [filecell,i1_series,i2_series,j1_series,j2_series]=get_file_series(Param); |
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82 | % filecell{iview,fileindex}: cell array representing the list of file names |
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83 | % iview: line in the table corresponding to a given file series |
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84 | % fileindex: file index within the file series, |
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85 | % i1_series(iview,ref_j,ref_i)... are the corresponding arrays of indices i1,i2,j1,j2, depending on the input line iview and the two reference indices ref_i,ref_j |
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86 | % i1_series(iview,fileindex) expresses the same indices as a 1D array in file indices |
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87 | % set of frame indices used for movie or multimage input |
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88 | |
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89 | |
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90 | %% root input file(s) and type |
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91 | RootPath=Param.InputTable(:,1); |
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92 | RootFile=Param.InputTable(:,3); |
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93 | SubDir=Param.InputTable(:,2); |
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94 | NomType=Param.InputTable(:,4); |
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95 | FileExt=Param.InputTable(:,5); |
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96 | |
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97 | % numbers of slices and file indices |
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98 | NbSlice=1;%default |
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99 | if isfield(Param.IndexRange,'NbSlice') |
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100 | NbSlice=Param.IndexRange.NbSlice; |
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101 | end |
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102 | nbview=numel(i1_series);%number of input file series (lines in InputTable) |
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103 | nbfield_j=size(i1_series{1},1); %nb of fields for the j index (bursts or volume slices) |
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104 | nbfield_i=size(i1_series{1},2); %nb of fields for the i index |
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105 | nbfield=nbfield_j*nbfield_i; %total number of fields |
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106 | nbfield_i=floor(nbfield/NbSlice);%total number of indexes in a slice (adjusted to an integer number of slices) |
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107 | nbfield=nbfield_i*NbSlice; %total number of fields after adjustement |
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108 | |
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109 | %determine the file type on each line from the first input file |
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110 | ImageTypeOptions={'image','multimage','mmreader','video'};%allowed input file types(images) |
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111 | |
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112 | [FileType{1},FileInfo{1},MovieObject{1}]=get_file_type(filecell{1,1}); |
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113 | CheckImage{1}=~isempty(find(strcmp(FileType,ImageTypeOptions)));% =1 for images |
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114 | if ~isempty(j1_series{1}) |
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115 | frame_index{1}=j1_series{1}; |
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116 | else |
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117 | frame_index{1}=i1_series{1}; |
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118 | end |
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119 | |
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120 | %% calibration data and timing: read the ImaDoc files |
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121 | %not relevant here |
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122 | |
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123 | %% check coincidence in time for several input file series |
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124 | %not relevant here |
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125 | |
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126 | %% coordinate transform or other user defined transform |
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127 | %not relevant here |
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128 | |
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129 | %%%%%%%%%%%% END STANDARD PART %%%%%%%%%%%% |
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130 | % EDIT FROM HERE |
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131 | |
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132 | %% check the validity of input file types |
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133 | if CheckImage{1} |
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134 | FileExtOut='.png'; % write result as .png images for image inputs |
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135 | if strcmp(lower(NomType{1}(end)),'a') |
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136 | NomTypeOut=NomType{1};%case of letter appendix |
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137 | else |
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138 | NomTypeOut='_1_1';% caseof purely numerical indexing |
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139 | end |
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140 | else |
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141 | msgbox_uvmat('ERROR',['invalid file type input: ' FileType{1} ' not an image']) |
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142 | return |
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143 | end |
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144 | |
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145 | %% Set field names and velocity types |
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146 | %not relevant here |
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147 | |
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148 | %% Initiate output fields |
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149 | %not relevant here |
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150 | |
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151 | %%% SPECIFIC PART BEGINS HERE |
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152 | NbSlice=Param.IndexRange.NbSlice; %number of slices |
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153 | %siz=size(i1_series); |
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154 | nbaver_init=23;%approximate number of images used for the sliding background: to be adjusted later to include an integer number of bursts |
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155 | j1=[];%default |
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156 | |
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157 | %% adjust the proposed number of images in the sliding average to include an integer number of bursts |
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158 | if nbfield_i~=1 |
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159 | nbaver=floor(nbaver_init/nbfield_j); % number of bursts used for the sliding background, |
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160 | if isequal(floor(nbaver/2),nbaver) |
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161 | nbaver=nbaver+1;%put the number of burst to an odd number (so the middle burst is defined) |
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162 | end |
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163 | nbaver_init=nbaver*nbfield_j;%propose by default an integer number of bursts |
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164 | end |
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165 | |
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166 | %% set processing parameters |
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167 | if checkrun ==-1 |
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168 | prompt = {'volume scan mode (Yes/No)';'Number of images for the sliding background (MUST FIT IN COMPUTER MEMORY)';... |
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169 | 'the luminosity rank chosen to define the background (0.1=for dense particle seeding, 0.5 (median) for sparse particles'}; |
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170 | dlg_title = ['get (slice by slice) a sliding background and substract to each image, result in subdir ' Param.OutputDir]; |
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171 | num_lines= 3; |
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172 | def = { 'No';num2str(nbaver_init);'0.1'}; |
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173 | answer = inputdlg(prompt,dlg_title,num_lines,def); |
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174 | |
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175 | %check input consistency |
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176 | if strcmp(answer{1},'No') && ~isequal(NbSlice,1) |
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177 | check=msgbox_uvmat('INPUT_Y-N',['confirm the multi-level splitting into ' num2str(NbSlice) ' slices']); |
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178 | if ~strcmp(check,'Yes') |
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179 | return |
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180 | end |
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181 | end |
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182 | if strcmp(answer{1},'Yes') |
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183 | step=1; |
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184 | else |
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185 | step=nbfield_j;%case of bursts: the sliding background is shifted by the length of one burst |
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186 | end |
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187 | nbaver_ima=str2num(answer{2});%number of images for the sliding background |
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188 | nbaver=ceil(nbaver_ima/step);%number of bursts for the sliding background |
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189 | if isequal(floor(nbaver/2),nbaver) |
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190 | nbaver=nbaver+1;%set the number of bursts to an odd number (so the middle burst is defined) |
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191 | end |
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192 | nbaver_ima=nbaver*step; |
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193 | if nbaver_ima > nbfield |
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194 | msgbox_uvmat('ERROR','number of images in a slice smaller than the proposed number of images for the sliding average') |
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195 | return |
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196 | end |
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197 | GUI_config.CheckVolume=strcmp(answer{1},'Yes'); |
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198 | GUI_config.SlidingSequenceSize=nbaver_ima; |
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199 | GUI_config.BrightnessRankThreshold=str2num(answer{3}); |
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200 | |
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201 | % apply the image rescaling function 'level' (avoid the blinking effects of bright particles) |
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202 | answer=msgbox_uvmat('INPUT_Y-N','apply image rescaling function levels.m after sub_background'); |
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203 | GUI_config.CheckLevelTransform=strcmp(answer,'Yes'); |
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204 | |
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205 | % return to BATCH mode |
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206 | if checkrun==-1 |
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207 | return %transfer to BATCH mode |
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208 | end |
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209 | else |
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210 | GUI_config=Param.Specific; |
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211 | if isequal(GUI_config.CheckVolume,1) |
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212 | step=1; |
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213 | else |
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214 | step=nbfield_j;%case of bursts: the sliding background is shifted by the length of one burst |
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215 | end |
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216 | nbaver_ima=GUI_config.SlidingSequenceSize;%number of images for the sliding background |
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217 | nbaver=ceil(nbaver_ima/step);%number of bursts for the sliding background |
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218 | if isequal(floor(nbaver/2),nbaver) |
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219 | nbaver=nbaver+1;%set the number of bursts to an odd number (so the middle burst is defined) |
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220 | end |
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221 | nbaver_ima=nbaver*step; |
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222 | if nbaver_ima > nbfield |
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223 | msgbox_uvmat('ERROR','number of images in a slice smaller than the proposed number of images for the sliding average') |
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224 | return |
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225 | end |
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226 | end |
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227 | |
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228 | % calculate absolute brightness rank |
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229 | rank=floor(GUI_config.BrightnessRankThreshold*nbaver_ima); |
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230 | if rank==0 |
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231 | rank=1;%rank selected in the sorted image series |
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232 | end |
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233 | |
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234 | %% prealocate memory for the sliding background |
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235 | try |
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236 | Afirst=read_image(filecell{1,1},FileType{1},MovieObject{1},frame_index{1}(1)); |
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237 | [npy,npx]=size(Afirst); |
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238 | if strcmp(class(Afirst),'uint8') % case of 8bit images |
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239 | Ak=zeros(npy,npx,nbaver_ima,'uint8'); %prealocate memory |
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240 | Asort=zeros(npy,npx,nbaver_ima,'uint8'); %prealocate memory |
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241 | else |
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242 | Ak=zeros(npy,npx,nbaver_ima,'uint16'); %prealocate memory |
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243 | Asort=zeros(npy,npx,nbaver_ima,'uint16'); %prealocate memory |
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244 | end |
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245 | catch ME |
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246 | msgbox_uvmat('ERROR',ME.message) |
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247 | return |
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248 | end |
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249 | |
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250 | %% update the xml file |
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251 | % SubDirBase=regexprep(Param.InputTable{1,2},'\..*','');%take the root part of SubDir, before the first dot '.' |
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252 | % filexml=fullfile(RootPath{1},[SubDirBase '.xml']); |
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253 | % if ~exist(filexml,'file') && exist([fullfile(RootPath{1},SubDir{1},RootFile{1}) '.xml'],'file')% xml inside the image directory |
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254 | % copyfile([filebase '.xml'],filexml);% copy the .xml file |
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255 | % end |
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256 | % if exist(filexml,'file') |
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257 | % t=xmltree(filexml); |
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258 | % %update information on the first image name in the series |
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259 | % uid_Heading=find(t,'ImaDoc/Heading'); |
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260 | % if isempty(uid_Heading) |
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261 | % [t,uid_Heading]=add(t,1,'element','Heading'); |
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262 | % end |
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263 | % uid_ImageName=find(t,'ImaDoc/Heading/ImageName'); |
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264 | % if ~isempty(j1_series{1}) |
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265 | % j1=j1_series{1}(1); |
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266 | % end |
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267 | % ImageName=fullfile_uvmat([dir_images term],'',RootFile{1},'.png',NomType,i1_series(1,1),[],j1); |
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268 | % [pth,ImageName]=fileparts(ImageName); |
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269 | % ImageName=[ImageName '.png']; |
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270 | % if isempty(uid_ImageName) |
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271 | % [t,uid_ImageName]=add(t,uid_Heading,'element','ImageName'); |
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272 | % end |
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273 | % uid_value=children(t,uid_ImageName); |
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274 | % if isempty(uid_value) |
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275 | % t=add(t,uid_ImageName,'chardata',ImageName);%indicate name of the first image, with ;png extension |
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276 | % else |
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277 | % t=set(t,uid_value(1),'value',ImageName);%indicate name of the first image, with ;png extension |
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278 | % end |
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279 | % |
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280 | % %add information about image transform |
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281 | % [t,new_uid]=add(t,1,'element','ImageTransform'); |
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282 | % [t,NameFunction_uid]=add(t,new_uid,'element','NameFunction'); |
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283 | % [t]=add(t,NameFunction_uid,'chardata','sub_background'); |
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284 | % if GUI_config.CheckLevel |
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285 | % [t,NameFunction_uid]=add(t,new_uid,'element','NameFunction'); |
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286 | % [t]=add(t,NameFunction_uid,'chardata','levels'); |
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287 | % end |
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288 | % [t,NbSlice_uid]=add(t,new_uid,'element','NbSlice'); |
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289 | % [t]=add(t,new_uid,'chardata',num2str(NbSlice)); |
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290 | % [t,NbSlidingImages_uid]=add(t,new_uid,'element','NbSlidingImages'); |
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291 | % [t]=add(t,NbSlidingImages_uid,'chardata',num2str(nbaver)); |
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292 | % [t,LuminosityRank_uid]=add(t,new_uid,'element','RankBackground'); |
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293 | % [t]=add(t,LuminosityRank_uid,'chardata',num2str(rank));% luminosity rank almong the nbaver sliding images |
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294 | % save(t,filexml) |
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295 | % end |
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296 | %copy the mask |
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297 | % if exist([filebase '_1mask_1'],'file') |
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298 | % copyfile([filebase '_1mask_1'],[filebase_b '_1mask_1']);% copy the mask file |
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299 | % end |
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300 | |
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301 | %MAIN LOOP ON SLICES |
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302 | for islice=1:NbSlice |
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303 | %% select the series of image indices at the level islice |
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304 | indselect=islice:NbSlice*step:nbfield;% select file indices of the slice |
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305 | for ifield=1:step-1 |
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306 | indselect=[indselect;indselect(end,:)+1]; |
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307 | end |
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308 | |
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309 | %% read the first series of nbaver_ima images and sort by luminosity at each pixel |
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310 | for ifield = 1:nbaver_ima |
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311 | ifile=indselect(ifield); |
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312 | filename=filecell{1,ifile}; |
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313 | Aread=read_image(filename,FileType{1},MovieObject{1},frame_index{1}(ifile)); |
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314 | if ndims(Aread)==3;%color images |
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315 | Aread=sum(double(Aread),3);% take the sum of color components |
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316 | end |
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317 | Ak(:,:,ifield)=Aread; |
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318 | end |
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319 | Asort=sort(Ak,3);%sort the luminosity of images at each point |
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320 | B=Asort(:,:,rank);%background image |
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321 | display( 'first background image will be substracted') |
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322 | nbfirst=(ceil(nbaver/2))*step; |
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323 | for ifield=1:nbfirst |
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324 | Acor=double(Ak(:,:,ifield))-double(B);%substract background to the current image |
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325 | Acor=(Acor>0).*Acor; % put to 0 the negative elements in Acor |
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326 | ifile=indselect(ifield); |
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327 | if ~isempty(j1_series{1}) |
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328 | j1=j1_series{1}(ifile); |
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329 | end |
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330 | newname=fullfile_uvmat(RootPath{1},Param.OutputSubDir,RootFile{1},FileExtOut,NomTypeOut,i1_series{1}(ifile),[],j1); |
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331 | |
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332 | %write result file |
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333 | if GUI_config.CheckLevelTransform |
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334 | C=levels(Acor); |
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335 | imwrite(C,newname,'BitDepth',8); % save the new image |
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336 | else |
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337 | if isequal(FileInfo{1}.BitDepth,16) |
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338 | C=uint16(Acor); |
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339 | imwrite(C,newname,'BitDepth',16); % save the new image |
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340 | else |
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341 | C=uint8(Acor); |
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342 | imwrite(C,newname,'BitDepth',8); % save the new image |
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343 | end |
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344 | end |
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345 | display([newname ' written']) |
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346 | end |
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347 | |
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348 | %% repeat the operation on a sliding series of images |
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349 | display('sliding background image will be substracted') |
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350 | if nbfield_i > nbaver_ima |
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351 | for ifield = step*ceil(nbaver/2)+1:step:nbfield_i-step*floor(nbaver/2) |
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352 | if checkrun |
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353 | stopstate=get(hseries.RUN,'BusyAction'); |
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354 | update_waitbar(hseries.waitbar_frame,WaitbarPos,(ifield+(islice-1)*nbfield_i)/(nbfield_i*NbSlice)) |
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355 | else |
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356 | stopstate='queue'; |
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357 | end |
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358 | if isequal(stopstate,'queue')% enable STOP command |
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359 | Ak(:,:,1:nbaver_ima-step)=Ak(:,:,1+step:nbaver_ima);% shift the current image series by one burst (step) |
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360 | %incorporate next burst in the current image series |
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361 | for iburst=1:step |
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362 | ifile=indselect(ifield+step*floor(nbaver/2)+iburst-1); |
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363 | filename=fullfile_uvmat(RootPath{1},SubDir{1},RootFile{1},FileExt{1},NomType{1},i1_series{1}(ifile),[],j1_series{1}(ifile)); |
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364 | Aread=read_image(filename,FileType{1},MovieObject{1},i1_series{1}(ifile)); |
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365 | if ndims(Aread)==3;%color images |
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366 | Aread=sum(double(Aread),3);% take the sum of color components |
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367 | end |
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368 | Ak(:,:,nbaver_ima-step+iburst)=Aread; |
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369 | end |
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370 | Asort=sort(Ak,3);%sort the new current image series by luminosity |
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371 | B=Asort(:,:,rank);%current background image |
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372 | for iburst=1:step |
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373 | index=step*floor(nbaver/2)+iburst; |
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374 | Acor=double(Ak(:,:,index))-double(B); |
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375 | Acor=(Acor>0).*Acor; % put to 0 the negative elements in Acor |
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376 | ifile=indselect(ifield+iburst-1); |
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377 | if ~isempty(j1_series{1}) |
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378 | j1=j1_series{1}(ifile); |
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379 | end |
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380 | newname=fullfile_uvmat(RootPath{1},Param.OutputSubDir,RootFile{1},FileExtOut,NomTypeOut,i1_series{1}(ifile),[],j1); |
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381 | %write result file |
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382 | if GUI_config.CheckLevelTransform |
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383 | C=levels(Acor); |
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384 | imwrite(C,newname,'BitDepth',8); % save the new image |
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385 | else |
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386 | if isequal(FileInfo{1}.BitDepth,16) |
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387 | C=uint16(Acor); |
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388 | imwrite(C,newname,'BitDepth',16); % save the new image |
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389 | else |
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390 | C=uint8(Acor); |
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391 | imwrite(C,newname,'BitDepth',8); % save the new image |
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392 | end |
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393 | end |
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394 | display([newname ' written']) |
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395 | |
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396 | end |
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397 | else |
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398 | return |
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399 | end |
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400 | end |
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401 | end |
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402 | |
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403 | %% substract the background from the last images |
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404 | display('last background image will be substracted') |
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405 | ifield=nbfield_i-(step*ceil(nbaver/2))+1:nbfield_i; |
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406 | for ifield=nbfield_i-(step*floor(nbaver/2))+1:nbfield_i |
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407 | index=ifield-nbfield_i+step*(2*floor(nbaver/2)+1); |
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408 | Acor=double(Ak(:,:,index))-double(B); |
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409 | Acor=(Acor>0).*Acor; % put to 0 the negative elements in Acor |
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410 | ifile=indselect(ifield); |
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411 | if ~isempty(j1_series{1}) |
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412 | j1=j1_series{1}(ifile); |
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413 | end |
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414 | newname=fullfile_uvmat(RootPath{1},Param.OutputSubDir,RootFile{1},FileExtOut,NomTypeOut,i1_series{1}(ifile),[],j1); |
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415 | |
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416 | %write result file |
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417 | if GUI_config.CheckLevelTransform |
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418 | C=levels(Acor); |
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419 | imwrite(C,newname,'BitDepth',8); % save the new image |
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420 | else |
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421 | if isequal(FileInfo{1}.BitDepth,16) |
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422 | C=uint16(Acor); |
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423 | imwrite(C,newname,'BitDepth',16); % save the new image |
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424 | else |
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425 | C=uint8(Acor); |
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426 | imwrite(C,newname,'BitDepth',8); % save the new image |
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427 | end |
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428 | end |
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429 | display([newname ' written']) |
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430 | end |
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431 | end |
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432 | |
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433 | %finish the waitbar |
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434 | if checkrun |
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435 | update_waitbar(hseries.waitbar,WaitbarPos,1) |
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436 | end |
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437 | |
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438 | |
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439 | function C=levels(A) |
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440 | %whos A; |
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441 | B=double(A(:,:,1)); |
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442 | windowsize=round(min(size(B,1),size(B,2))/20); |
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443 | windowsize=floor(windowsize/2)*2+1; |
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444 | ix=1/2-windowsize/2:-1/2+windowsize/2;% |
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445 | %del=np/3; |
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446 | %fct=exp(-(ix/del).^2); |
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447 | fct2=cos(ix/(windowsize-1)/2*pi/2); |
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448 | %Mfiltre=(ones(5,5)/5^2); |
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449 | %Mfiltre=fct2'; |
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450 | Mfiltre=fct2'*fct2; |
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451 | Mfiltre=Mfiltre/(sum(sum(Mfiltre))); |
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452 | |
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453 | C=filter2(Mfiltre,B); |
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454 | C(:,1:windowsize)=C(:,windowsize)*ones(1,windowsize); |
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455 | C(:,end-windowsize+1:end)=C(:,end-windowsize+1)*ones(1,windowsize); |
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456 | C(1:windowsize,:)=ones(windowsize,1)*C(windowsize,:); |
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457 | C(end-windowsize+1:end,:)=ones(windowsize,1)*C(end-windowsize,:); |
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458 | C=tanh(B./(2*C)); |
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459 | [n,c]=hist(reshape(C,1,[]),100); |
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460 | % figure;plot(c,n); |
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461 | |
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462 | [m,i]=max(n); |
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463 | c_max=c(i); |
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464 | [dummy,index]=sort(abs(c-c(i))); |
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465 | n=n(index); |
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466 | c=c(index); |
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467 | i_select = find(cumsum(n)<0.95*sum(n)); |
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468 | if isempty(i_select) |
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469 | i_select = 1:length(c); |
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470 | end |
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471 | c_select=c(i_select); |
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472 | n_select=n(i_select); |
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473 | cmin=min(c_select); |
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474 | cmax=max(c_select); |
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475 | C=(C-cmin)/(cmax-cmin)*256; |
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476 | C=uint8(C); |
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