Provided by: gpivtools_0.6.0-3build1_amd64

**NAME**

gpiv_imgproc - Image processing program for (PIV) images.

**SYNOPSIS**

gpiv_imgproc[-bN] [--filterN] [-h|--help] [-p|-oN|--operationN] [-tN|--thresholdN] [-wN] [-v|--version] [filename] <stdin>stdout

**DESCRIPTION**

gpiv_imgprocprocesses, 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 filteringgpiv_getbit: get bit bumber.gpiv_mktestimg: generates test image-pair for PIV The parameters read from the configuration resources (containing the keyGPIV_IMGPROC) may be overruled by the command line options, as explained below.

**Options**

-bNIn case of usinggpiv_getbitNdenotes the bit number [0, .., 7]--filterNImage 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|--helpOn-line help-oN|--operationNIn case of usinggpiv_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)-tN|--thresholdNIn case of usinggpiv_clip: threshold value to be set to zero-v|--versionPrint version information on standard output, then exit successfully.-wNwindow size (default: 15)filenameInput image filename. Overridesstdinandstdoutwith the fullfilenameof the image. Output will be written tofilename.png. Parameters are stored infilename.parand may be used for future use by including them in./gpivrc. Ifstdinandstdoutare used, the input is expected to be a PNG formatted image.SEEALSOgpivtools

**AUTHOR**

Gerber Van der Graaf 7 November 2006 GPIV_IMGPROC(1)