NAME
gpiv_imgproc gpiv_smooth gpiv_hilo gpiv_clip gpiv_fft gpiv_invfft gpiv_lowpass gpiv_highpass gpiv_getbit - Image processing program for PIV images.
SYNOPSIS
gpiv_imgproc [-b N] [-c int] [-f filename] [--filter N] [-h | --help] [-p | --print] [-o N | --operation N] [-r int] [-t N | --threshold N] [-w N] [-v | --version] < stdin > stdout
DESCRIPTION
gpiv_imgproc Processes, filters or converts images in order to improve the interrogation for Particle Image Velocimetry. smooth: smoothing filter, hilo : high-low filter, clip: clipping fft : Fast Fourier Transform, invfft: Inverse Fast Fourier Transform, lowpass: low-pass filtering, highpass: high-pass filtering getbit: get bit bumber. 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.
Options
- -b N
-
In case of using getbit N denotes the bit number [0, .., 7]
-c N Specify the number of columns with N that contains the image.
- -f filename
-
Overrides stdin and stdout with filename. The filename has to be given without its .r extension. The output will be written to filename..proc.r. Parameters are stored in filename.par and may be used for future use by including them in ./gpivrc.
- --filter N
-
Only if gpiv_imgproc is used. image filter to be performed: 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 smoothing: set pixel equal to the mean of the window value (N0), subtract mean from from pixel (N1) add (N2), multiply (N3) or divide (N4)
- -r N
-
Number of rows N that contains the image.
- -t N | --threshold N
-
In case of using clip: threshold value to be set to zero
- -v | --version
-
Print version information on standard output, then exit successfully.
- -w N
-
window size (default: 15)
- gpivtools
SEE ALSO
AUTHOR
Gerber Van der Graaf