Changes between Version 44 and Version 45 of UvmatHelp


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Timestamp:
Jun 5, 2013, 10:16:13 PM (7 years ago)
Author:
sommeria
Comment:

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  • UvmatHelp

    v44 v45  
    8686Once a root name has been introduced, navigation among  the file indices is provided by the red push buttons '''[runplus]''' ( '''[+>]''')  and   '''[runmin] ''' ('''[<-]'''). The central push button '''[run0]''' ('''[0]''') refreshes the current plot. See [#a3.4Navigationamongfileindices: section 3.4] for more details.
    8787
    88 When available, the time of each frame or field is displayed in the edit box '''[TimeValue]''', at the very right. In the case of image pairs, the time interval Dt is displayed between the edit boxes '''[i1], [j1]''' and '''[i2], [j2]'''. This timing information can be read directly in the input file, in the case of movies or Netcdf files, or can be defined in an image documentation file, see [#a3.5Imagedocumentationfiles.xml: section 3.5] (in case of conflict, the latter prevails).
     88When available, the time of each frame or field is displayed in the edit box '''[!TimeValue]''', at the very right. In the case of image pairs, the time interval Dt is displayed between the edit boxes '''[i1], [j1]''' and '''[i2], [j2]'''. This timing information can be read directly in the input file, in the case of movies or Netcdf files, or can be defined in an image documentation file, see [#a3.5Imagedocumentationfiles.xml: section 3.5] (in case of conflict, the latter prevails).
    8989
    9090'''Note: ''' the five last input file names, as well as other pieces of personal information, are stored for convenience in a file (''uvmat_perso.mat'') automatically created in the user preference directory of Matlab (indicated by the Matlab command '>>prefdir'. Browsers then  read default input in this file. A corruption of this file ''uvmat_perso.mat'' may lead to problems for  opening uvmat, type '>>reinit' on the Matlab prompt to delete it and reinitialise the configuration of uvmat.
     
    108108uvmat can read any image format recognised by the Matlab image reading function ''imread.m''. Images can be in true color or B&W, with 8 bit or 16 bit grey levels. Image files containing multiple frames are handled. Movie files can be also opened, using the Matlab function ''!VideoReader.m'', or ''mmreader.m'' for older versions of Matlab.
    109109
    110 Velocity fields and all results of data processing are stored in the Netcdf format, see [#a7Netcdffilesandget_field.fig: section 7-] for details. They are read by the function ''nc2struct.m''. Then different quantities (vorticity, divergence...) can be obtained.
     110''Uvmat'' can also read various kinds of data in the format Netcdf. Velocity fields obtained by PIV and results of data processing are stored in this format, see [#a7Netcdffilesandget_field.fig: section 7] for details. Then different quantities (vorticity, divergence...) can be obtained. The input file type is recognized by the function ''get_file_type.m'' of uvmat and the file is opened by the function ''read_field.m'' according to this file type. it is possible to include new file types by a modification of these two functions.
    111111
    112112The PIV software CIVx requires B&W images in the format png (portable network graphics). It is a binary format for images with lossless (reversible) compression, recommended by w3c (http://www.w3.org/Graphics/PNG). It is an open source patent-free replacement of GIF and can also replace many common uses of TIFF. It can be read directly by all standard programs of image visualisation and processing.  Compressing a raw binary image to its png form typically saves disk storage by a factor of 3.