1 .TH GPIV_IMGPROC 1 "21 October 2010"
3 gpiv_imgproc \- Image processing program for (PIV) images.
10 [\fB-h\fR | \fB--help\fR]
11 [\fB-p\fR | \fB--print\fR]
12 [\fB-o \fIN\fR | \fB--operation \fIN\fR]
13 [\fB-t \fIN\fR | \fB--threshold \fIN\fR]
15 [\fB-v\fR | \fB--version\fR]
16 [\fB-i\fR | \fB--image\fR \fIfilename\fR]
18 < \fIstdin\fR > \fIstdout\fR
24 \fBgpiv_imgproc\fP processes, filters or converts images in order to
25 improve the interrogation for Particle Image Velocimetry.
26 \fBgpiv_smooth\fR: smoothing filter,
27 \fBgpiv_hilo \fR: high-low filter,
28 \fBgpiv_clip\fR: clipping,
29 \fBgpiv_fft\fR: Fast Fourier Transform,
30 \fBgpiv_invfft\fR: Inverse Fast Fourier Transform,
31 \fBgpiv_highpass\fR: high-pass filtering
32 \fBgpiv_getbit\fR: get bit bumber.
33 \fBgpiv_mktestimg\fR: generates test image-pair for PIV
34 \fBgpiv_subtr-img\fR: subtracts an image from the input data
36 The parameters read from the configuration resources (containing the
37 key \fBGPIV_IMGPROC\fR) may be overruled by the command line options, as
43 In case of using \fBgpiv_getbit\fR \fIN\fP denotes the bit number [0, .., 7]
46 \fB-f\fR | \fB--filter \fIN\fR
47 Image filter to be applied: make test image (\fIN\fR=0), subtract
48 image (\fIN\fR=1), smoothing (\fIN\fR=2), high-low filtering
49 (\fIN\fR=3), clipping (\fIN\fR=4), fft (\fIN\fR=5), inverse fft
50 (\fIN\fR=6), lowpass filter (\fIN\fR=9), highpass filter (\fIN\fR=10),
54 \fB-h\fR | \fB--help\fP
58 \fB-i\fR | \fB--image\fR \fIfilename\fR
59 Only used for subtracting an image from the input image: image
60 filename used for subtraction. Default: background.png. This might,
61 for example, be a background image that has been produced by
62 \fBgpiv_t-avg-img\fR. Image subtracting can also be performed by using
66 \fB-o \fIN\fR | \fB--operation \fIN\fR
67 In case of using \fBgpiv_smooth\fR: set pixel equal to the mean of the
68 window value (\fIN\fR0), subtract mean from from pixel (\fIN\fR1) add
69 (\fIN\fR2), multiply (\fIN\fR3) or divide (\fIN\fR4)
72 \fB-t \fIN\fR | \fB--threshold \fIN\fR
73 In case of using \fBgpiv_clip\fR: threshold value to be set to zero
76 \fB-v\fR | \fB--version\fP
77 Print version information on standard output, then exit successfully.
81 window size (default: 15)
85 Input image filename. Overrides \fIstdin\fR and \fIstdout\fR with the full \fIfilename\fR of
86 the image. Output will be written to \fIfilename\fB.png\fR. Parameters
87 are stored in \fIfilename\fB.par\fR and may be used for future use by
88 including them in \fI./gpivrc\fR. If \fIstdin\fR and \fIstdout\fR are
89 used, the input is expected to be a PNG formatted image.