1 | % 'ima_edge_detection': find edges
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2 |
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3 | %------------------------------------------------------------------------
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4 | %%%% Use the general syntax for transform fields with a single input and parameters %%%%
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5 | % OUTPUT:
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6 | % Data: output field structure
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7 | %
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8 | %INPUT:
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9 | % DataIn: input field structure
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10 | % Param: matlab structure whose field Param.TransformInput contains the filter parameters
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11 | %-----------------------------------
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12 |
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13 | %=======================================================================
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14 | % Copyright 2008-2016, LEGI UMR 5519 / CNRS UGA G-INP, Grenoble, France
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15 | % http://www.legi.grenoble-inp.fr
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16 | % Joel.Sommeria - Joel.Sommeria (A) legi.cnrs.fr
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17 | %
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18 | % This file is part of the toolbox UVMAT.
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19 | %
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20 | % UVMAT is free software; you can redistribute it and/or modify
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21 | % it under the terms of the GNU General Public License as published
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22 | % by the Free Software Foundation; either version 2 of the license,
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23 | % or (at your option) any later version.
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24 | %
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25 | % UVMAT is distributed in the hope that it will be useful,
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26 | % but WITHOUT ANY WARRANTY; without even the implied warranty of
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27 | % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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28 | % GNU General Public License (see LICENSE.txt) for more details.
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29 | %=======================================================================
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30 |
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31 | function Data=ima_edge_detection(Data,Param,Data_1)
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32 |
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33 | %% request input parameters
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34 | if isfield(Data,'Action') && isfield(Data.Action,'RUN') && isequal(Data.Action.RUN,0)
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35 | prompt = {'npx';'npy';'threshold'};
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36 | dlg_title = 'get the filter size in x and y';
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37 | num_lines= 3;
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38 | def = { '50';'50';'0.3'};
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39 | if isfield(Param,'TransformInput')&&isfield(Param.TransformInput,'FilterBoxSize_x')&&...
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40 | isfield(Param.TransformInput,'FilterBoxSize_y')&&isfield(Param.TransformInput,'LumThreshold')
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41 | def={num2str(Param.TransformInput.FilterBoxSize_x);num2str(Param.TransformInput.FilterBoxSize_y);num2str(Param.TransformInput.LumThreshold)};
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42 | end
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43 | answer = inputdlg(prompt,dlg_title,num_lines,def);
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44 | Data.TransformInput.FilterBoxSize_x=str2num(answer{1}); %size of the filtering window
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45 | Data.TransformInput.FilterBoxSize_y=str2num(answer{2}); %size of the filtering window
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46 | Data.TransformInput.LumThreshold=str2num(answer{3}); %size of the filtering window
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47 | return
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48 | end
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49 |
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50 |
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51 | %definition of the cos shape matrix filter
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52 | ix=[1/2-Param.TransformInput.FilterBoxSize_x/2:-1/2+Param.TransformInput.FilterBoxSize_x/2];%
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53 | iy=[1/2-Param.TransformInput.FilterBoxSize_y/2:-1/2+Param.TransformInput.FilterBoxSize_y/2];%
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54 | %del=np/3;
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55 | %fct=exp(-(ix/del).^2);
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56 | fct2_x=cos(ix/((Param.TransformInput.FilterBoxSize_x-1)/2)*pi/2);
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57 | fct2_y=cos(iy/((Param.TransformInput.FilterBoxSize_y-1)/2)*pi/2);
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58 | %Mfiltre=(ones(5,5)/5^2);
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59 | Mfiltre=fct2_y'*fct2_x;
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60 | Mfiltre=Mfiltre/(sum(sum(Mfiltre)));%normalize filter
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61 |
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62 | Afilt=filter2(Mfiltre,Data.A);% smooth the image, excluding the edges (spurious reflexions)
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63 |
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64 | %Afilt=filter2(Mfiltre,Data.A(100:end-100,100:end-100));% smooth the image, excluding the edges (spurious reflexions)
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65 | %Data.A= double(Data.A)-Afilt;
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66 |
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67 |
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68 |
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69 |
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70 | %
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71 | Amax=max(max(Afilt));
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72 | Amin=min(min(Afilt));
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73 | % Data.A( Data_1.A(100:end-100,100:end-100)==100)=(Amin+Amax)/2;
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74 |
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75 |
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76 |
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77 | Athreshold=(Amin+Amax)*Param.TransformInput.LumThreshold;
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78 | %
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79 | % Data.A=zeros(size(Data.A,1),size(Data.A,2),3);
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80 | Data.A=(Data.A>Athreshold);%transform to the initial image format
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81 | % Data.A(:,:,1)=Data.A;%transform to the initial image format, red
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82 | STATS = regionprops(Data.A, 'FilledArea','MinorAxisLength','MajorAxisLength','PixelIdxList');
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83 | Area=zeros(size(STATS));
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84 | for iobj=1:numel(STATS)
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85 | Area(iobj)=STATS(iobj).FilledArea;
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86 | end
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87 | [Area, main_obj]=max(Area)
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88 | MajorAxisLength=STATS(main_obj).MajorAxisLength;
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89 | MinorAxisLength=STATS(main_obj).MinorAxisLength;
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90 | for iobj=1:numel(STATS)
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91 | if iobj~=main_obj
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92 | Data.A(STATS(iobj).PixelIdxList)=0;
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93 | end
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94 | end
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95 |
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96 | Data.A=Amax*Data.A;
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97 |
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