Changes between Version 151 and Version 152 of UvmatHelp

Jan 14, 2015, 2:55:57 PM (9 years ago)



  • UvmatHelp

    v151 v152  
    140140The field indices can be incremented or decremented by the push buttons  '''[runplus]''' ( '''+''') and  '''[runmin]''' ('''-''') respectively.  This scanning is performed  over the first index (i) or the second one (j), depending on the selection of the check boxes '''[scan_i]''' or '''[scan_j]''' respectively. The step for increment is set by the edit box '''[increment_scan]'''. If this box is blank (or does not contain a number) the next available file is opened.
    142 <doc65|center>
     142[[Image(3-4 Navigation among fields indices.png)]]
    144144The current indices are displayed in the four edit boxes '''[i1], [i2], [j1], [j2]'''. The two first indices i1 and j1 are used for image series, while the second line i2, j2 is used to label the image pairs used for PIV data. The file indices can be directly set in these edit boxes, or equivalently in the edit box '''[!FileIndex]''' at the top of the GUI.
    539539This GUI '''get_field.fig''' is aimed at browsing a NetCDF file, showing all its variables, attributes and variable dimensions. Variables can be selected for input in '''uvmat''' or '''series'''. The GUI is opened by selecting the option '''get_field...''' in the menu '''[!FieldName]''' of '''uvmat''' or '''series'''. This option is automatically selected when the input NetCDF file is not recognised as CIV data.
    541 <doc62|center>
     541[[Image(7-2 The GUI get_field .png )]]
    543543When a NetCDF input file opened, its full name, including path, is displayed in the upper window '''[inputfile]'''. The names and value of the global attributes are listed in the left column '''[attributes]''', the list of variables in the central column '''[variables]''', and the list of dimension names and values in the right column '''[dimensions]'''. By selecting one of the variables in the central column, the corresponding variable attributes and dimensions are displayed in the left and right columns respectively. Note that the whole content of the NetCDF file can be obtained by the function ''nc2struct.m''. Input fields can be selected according to three options, chosen by the menu '''[!FieldOption]'''.
    780780With all the options for pair comparisons, the set of reference frames is given by the master GUI '''series.fig'''.
    782 <doc78|center>
     782[[Image(11-1 Overview PIV.png)]]
    784784-''' Succession of operations: '''
    805805The search parameters (SearchBoxSize,earchBoxShift) can be estimated using the press button '''[search range]'''. First introduce the estimated minimum and maximum values of each velocity component u and v. The result depends on the time interval of the image pair. Change the selected image pair if the maximum displacement (ibsx-ibx)/2 is too small (lack of precision) or too large (bad image correlations and risks of false vectors).
    807 <doc72|center>
     807[[Image(11-2 CV1.png)]]
    809809The grid determines the positions of measured velocity vectors: it sets the central positions of the correlation boxes (in pixels) for the first image. A default regular grid can be set by the meshes '''[num_Dx] ''' and '''[num_Dy]''' (in pixels). Alternatively a custom [grid->#sec3.6_grid] can be stored in a text file and selected by the check box '''[GET_GRID]'''. This is convenient to limitate the processing to a subregion or to fine tune the resolution.