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       gpiv_imgproc - Image processing program for (PIV) images.


       gpiv_imgproc  [-b  N] [--filter N] [-h | --help] [-p | --print] [-o N |
       --operation N]  [-t  N  |  --threshold  N]  [-w  N]  [-v  |  --version]
       [filename] < stdin > stdout


       gpiv_imgproc  processes, filters or converts images in order to improve
       the  interrogation  for  Particle  Image   Velocimetry.    gpiv_smooth:
       smoothing  filter,  gpiv_hilo  :  high-low filter, gpiv_clip: clipping,
       gpiv_fft: Fast Fourier Transform, gpiv_invfft:  Inverse   Fast  Fourier
       Transform,  gpiv_highpass:  high-pass  filtering  gpiv_getbit:  get bit
       bumber.  gpiv_mktestimg: generates test image-pair for PIV

       The parameters read from the configuration  resources  (containing  the
       key  GPIV_IMGPROC)  may  be  overruled  by the command line options, as
       explained below.


       -b N   In case of using gpiv_getbit N denotes the bit number [0, .., 7]

       --filter N
              Image  filter  to  be  applied: make test image (N=0), smoothing
              (N=1), high-low filtering  (N=2),  clipping  (N=3),  fft  (N=4),
              inverse  fft (N=5), lowpass filter (N=8), highpass filter (N=9),
              getbit (N=10).

       -h | --help
              On-line help

       -o N | --operation N
              In case of using gpiv_smooth: set pixel equal to the mean of the
              window  value (N0), subtract mean from from pixel (N1) add (N2),
              multiply (N3) or divide (N4)

       -t N | --threshold N
              In case of using gpiv_clip: threshold value to be set to zero

       -v | --version
              Print  version  information  on  standard  output,   then   exit

       -w N   window size (default: 15)

              Input  image  filename. Overrides stdin and stdout with the full
              filename of the image. Output will be written  to  filename.png.
              Parameters are stored in filename.par and may be used for future
              use by including them in ./gpivrc. If stdin and stdout are used,
              the input is expected to be a PNG formatted image.

       SEE ALSO


       Gerber Van der Graaf

                                7 November 2006