NAME¶
gpiv_imgproc - Image processing program for (PIV) images.
SYNOPSIS¶
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
DESCRIPTION¶
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.
Options¶
- -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 successfully.
- -w N
- window size (default: 15)
- filename
- 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¶
gpivtools
AUTHOR¶
Gerber Van der Graaf
