Changes between Version 75 and Version 76 of UvmatHelp


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Timestamp:
Jun 27, 2013, 10:57:30 PM (7 years ago)
Author:
sommeria
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  • UvmatHelp

    v75 v76  
    240240
    241241=== 4.2 Vectors ===
    242 The vector fields are represented by arrows. The length of the arrows is automatically set when the check box'''[!CheckFixVectors]''' is not selected, or it can be adjusted by the edit box '''[num_VecScale]'''.  For clarity of visualisation, the number of displayed vectors can be divided by 2 or 4 in each direction by selecting the check box '''[CheckDecimate4]''', or '''[CheckDecimate16]''' respectively.
     242The vector fields are represented by arrows. The length of the arrows is automatically set by default, or can be adjusted by the edit box '''[num_VecScale]''' when the check box'''[!CheckFixVectors]''' is selected.  For clarity of visualisation, the number of displayed vectors can be divided by 2 or 4 in each direction by selecting the check box '''[CheckDecimate4]''', or '''[CheckDecimate16]''' respectively.
    243243
    244244Each vector has a color, ranging from blue to red, which can represent an associated  scalar value. In addition, black and magenta colors represent warning and error flags respectively. This color system is primarily designed for PIV data but can be used in other contexts as well.
     
    246246[[Image(help_vectors_titres.jpg)]]
    247247
    248 -'''Warning flags''': they indicate a vector resulting from a dubious  image correlation process, but not removed from the data set. Their display in black can be desactivated by selecting the check box '''[!CheckHideWarning]'''.
    249 
    250 -'''Error flags''': they mark in magenta color vectors considered as false. These vectors are kept in the data set so that their elimination can be reversed, but they must not be taken into account for data processing. They can be removed for visualisation by selecting the check box '''[!CheckHideFalse]'''.
    251 
    252 -'''Associated scalar: '''  for PIV velocity fields, the color  represents by default the image correlation, ranging from 0 to 1.  The red values correspond to poor correlations, green to fair values, and blue to good ones. The value range covered by each of the three colors is set by the pair of sliders  '''[Slider1]''' and '''[Slider2]''', or equivalently by the edit boxes '''[num_ColCode1]''' and '''[num_ColCode2]'''. Other color representations can be specified. '''[!ColorScalar]''' sets the scalar used for color representation, for instance the vector norm 'norm_vec' or vorticity 'vort' (the list of available scalars is set by the function {calc_scal.m}).  '''[ColorCode] ''' sets the kind of color representation:
    253 
     248-'''Warning flags''': they indicate a vector resulting from a dubious image correlation process, but not removed from the data set. They are displayed in black by default. This feature can be desactivated by selecting the check box '''[!CheckHideWarning]'''.
     249
     250-'''Error flags''': they mark vectors considered as false. These vectors are kept in the data set so that their elimination can be reversed, but they must not be taken into account for data processing. These false vectors are displayed in magenta. They can be also removed from the plot by selecting the check box '''[!CheckHideFalse]'''.
     251
     252-'''Associated scalar: '''  for PIV velocity fields, the color  represents by default the image correlation '''C''', ranging from 0 to 1.  The red values correspond to poor correlations, green to fair values, and blue to good ones. The value range covered by each of the three colors is set by the pair of sliders  '''[Slider1]''' and '''[Slider2]''', or equivalently by the edit boxes '''[num_ColCode1]''' and '''[num_ColCode2]'''. Other color representations can be specified. '''[!ColorScalar]''' sets the scalar used for color representation, for instance the vector norm 'norm_vec' or vorticity 'vort' (the list of available scalars is set by the function {calc_scal.m}).
     253
     254-'''[ColorCode] ''' sets the kind of color representation:
    254255 * 'rgb':  color ranging from red, for the scalar value set by '''[num_MinVec]''', to blue, for the scalar value set by  '''[num_MaxVec]'''. The  color thresholds from red to green and green to blue are set by '''[ColCode1]''' and '''[ColCode2]''' respectively, or the sliders  '''[Slider1]''' and '''[Slider2]'''. By unselecting the check box [CheckFixVecColor], these thresholds can be set to match the min and max scalar values.
    255256 * 'black' or 'white': set the color for all vectors
     
    257258 * '64 colors': quasi-continuous color representation, ranging from blue (for the scalar value given by '''[num_MinVec]''', to red, for the scalar value given by '''[num_MaxVec]'''.
    258259
    259 -'''Mouse display''': when the mouse is moved over a vector, it is marked by a circle, and its features appear in the display text boxes on the upper right. These are  -* fist line: the position coordinates x, y, (z for 3D cases).  -* second line: the vector components -* third line: the vector index in the file, the values of the scalar (C), the warning flag (F) and the error flag (FF). The meaning of the flag values is given in [section 10.3->#sec10.3].
    260 
    261 -'''Manual editing of vectors''':  vectors can be manually set as 'false' by pressing '''[!Edit/Vectors] ''' in the menu bar, then selecting the vector with the mouse. The selected vector becomes magenta. Inversely, if a magenta vector is selected, it is rehabilitated and retrieves its initial color.  The corrections are  recorded as false flags in the data file by pressing the pushbutton '''[record]'''.
     260-'''Mouse display''': when the mouse is moved over a vector, it is marked by a circle, and its features appear in the display text boxes on the upper right. These are 
     261 * fist line: the position coordinates x, y, (z for 3D cases). 
     262 * second line: the vector components
     263 * third line: the vector index in the file, the values of the scalar (C), the warning flag (F) and the error flag (FF). The meaning of the flag values is given in [#a11.3FIX section 11.3].
     264
     265-'''Manual editing of vectors''': error flags are automatically produced by the PIV operation, see [#a11.3FIX section 11.3]. It is also possible to introduce them manually by checking '''[edit_vect]''' and selecting a vector with the mouse. The flag can be removed by selecting it again. To record the changes in the input file, press the button '''[record]'''.
    262266
    263267=== 4.3 Histograms ===