Changes between Version 77 and Version 78 of UvmatHelp


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Timestamp:
Jun 27, 2013, 11:40:44 PM (7 years ago)
Author:
sommeria
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  • UvmatHelp

    v77 v78  
    271271
    272272=== 4.4 Comparing two fields ===
    273 A second field series can be opened and compared to the first one, using the menu bar command '''[Open_1]'''.  Then a new file name and indices appear on the second line, as well as the check box '''[SubField]''' on the very right. The second field can be alternatively obtained by selecting a field in the popup menu '''[Fields_1] ''' (under '''[Fields]''').
     273A second field series can be opened and compared to the first one, by selecting the check box '''[!SubField]''' on the very left.
    274274
    275275If the two files are both images or scalar, their difference is introduced as the input field. If one field  is an image (or scalar), while the other one is a vector field, the image will appear as a background in the vector field. This is convenient for instance to relate the CIV result to the quality of the images, or to relate vorticity to the vector field.
     
    277277If  two vector fields are compared, their difference is taken as the input field, and is then displayed and analysed. If the two fields are not at the same points, the velocity of the second field is linearly interpolated at the positions of the first one (using the Matlab function {griddata.m}). The color and flags are then taken from the first field.
    278278
    279 The two file series will be scanned simultaneously by '''[runplus]''' ( '->') and  '''[runmin]''' ('<-') , according to their own nomenclature. It is also possible to manually edit the second file indices '''[FieldIndex_1] ''' to compare two fields with different indices.  If available, the time of the second field is indicated in the edit box '''[abs_time_1] ''' at the very right, below the time of the main field.
    280 
    281 The second field can be removed by unselecting the check box '''[SubField] ''' on the very right.
     279The two file series will be scanned simultaneously by '''[runplus]''' ( '->') and  '''[runmin]''' ('<-') , according to their own nomenclature. It is also possible to manually edit the second file indices '''[!FieldIndex_1] ''' to compare two fields with different indices.  If available, the time of the second field is indicated in the edit box '''[abs_time_1] ''' at the very right, below the time of the main field.
     280
     281The second field can be removed by unselecting the check box '''[!SubField] '''.
    282282
    283283=== 4.5 Field transforms ===
    284 A transform can be systematically applied after reading the input field, for instance the transform 'phys' which takes into account geometric calibration. This transform can possibly combine two input fields, for instance to substract a background from an image. The processing function is chosen  by the popup menu '''[transform_fct]''' on the left, and its path is displayed in the box '''[path_transform]'''. Select the option 'more...' to browse new functions. The same functions can be called in data processsing using the GUI '''series.fig'''. A few functions are provided in the folder /transform_fct, see list in  [annex->#overview].
    285 
    286 These functions can transform fields into polar coordinates, do image filtering, Fourier transform, signal analysis for a 1D input field... Other functions can be easily written using those as templates.  The  general form of such functions is  DataOut=transform_fct(DataIn,XmlData,DataIn_1,XmlData_1) where Data is an input field object, as described in [section 5.4->#sec5.4], and XmlData the content of the xml file Imadoc, as stored in the uvmat GUI. XmlData contains in particular the element .[wiki:GeometryCalib] containing the calibration parameters, see  [section 7->#geometry_calib].
     284A transform can be systematically applied after reading the input field, for instance the transform 'phys' which takes into account geometric calibration. This transform can possibly combine two input fields, for instance to substract a background from an image. The processing function is chosen  by the popup menu '''[transform_fct]''' on the left, and its path is displayed in the box '''[path_transform]'''. Select the option 'more...' to browse new functions. The same functions can be called in data processsing using the GUI '''series.fig'''. A few functions are provided in the folder /transform_fct, see the list in  [#transformfunctions the function overview].
     285
     286These functions can transform fields into polar coordinates, do image filtering, Fourier transform, signal analysis for a 1D input field... Other functions can be easily written using those as templates.  The  general form of such functions is  !DataOut=transform_fct(!DataIn,!XmlData,!DataIn_1,!XmlData_1) where Data is an input field object, as described in [#a5.2FieldrepresentationasMatlabstructure section 5.2], and !XmlData the content of the xml file Imadoc, as stored in the uvmat GUI. !XmlData contains in particular the element .[wiki:GeometryCalib] containing the calibration parameters, see  [#a8.2TheGUIgeometry_calib.fig section 8.2].
    287287
    288288=== 4.6 Succession of operations: ===