1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
.TH GPIV_IMGPROC 1 "19 Januari 2005"
.SH 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.
.SH SYNOPSIS
\fBgpiv_imgproc\fP
[\fB-b \fIN\fR]
[\fB-c \fIint\fR]
[\fB-f \fIfilename\fR]
[\fB--filter \fIN\fR]
[\fB-h\fR | \fB--help\fR]
[\fB-p\fR | \fB--print\fR]
[\fB-o \fIN\fR | \fB--operation \fIN\fR]
[\fB-r \fIint\fR]
[\fB-t \fIN\fR | \fB--threshold \fIN\fR]
[\fB-w \fIN\fR]
[\fB-v\fR | \fB--version\fR]
< \fIstdin\fR > \fIstdout\fR
\fP
.SH DESCRIPTION
\fBgpiv_imgproc\fP Processes, filters or converts images in order to
improve the interrogation for Particle Image Velocimetry.
\fIsmooth\fR: smoothing filter,
\fIhilo \fR: high-low filter,
\fIclip\fR: clipping
\fIfft \fR: Fast Fourier Transform,
\fIinvfft\fR: Inverse Fast Fourier Transform,
\fIlowpass\fR: low-pass filtering,
\fIhighpass\fR: high-pass filtering
\fIgetbit\fR: get bit bumber.
\fImktestimg\fR: generates test image-pair for PIV
The parameters read from the configuration resources (containing the
key \fBGPIV_IMGPROC\fR) may be overruled by the command line options, as
explained below.
.SH Options
.TP
\fB-b \fIN\fP
In case of using \fBgetbit\fR \fIN\fP denotes the bit number [0, .., 7]
\fB-c \fIN\fR
Specify the number of columns with \fIN\fR that
contains the image.
.TP
\fB-f \fIfilename\fR
Overrides stdin and stdout with \fIfilename\fR. The \fIfilename\fR has
to be given without its \fB.r\fR extension. The output will be
written to \fIfilename\fB..proc.r\fR. Parameters are stored
in \fIfilename\fB.par\fR and may be used for future use by including them
in \fI./gpivrc\fR.
.TP
\fB--filter \fIN\fR
Only if \fBgpiv_imgproc\fR is used. image filter to be performed: make test
image (\fIN\fR=0), smoothing (\fIN\fR=1), high-low filtering
(\fIN\fR=2), clipping (\fIN\fR=3), fft (\fIN\fR=4), inverse fft
(\fIN\fR=5), lowpass filter (\fIN\fR=8), highpass filter (\fIN\fR=9),
getbit (\fIN\fR=10).
.TP
\fB-h\fR | \fB--help\fP
On-line help
.TP
\fB-o \fIN\fR | \fB--operation \fIN\fR
In case of using \fBsmoothing\fR: set pixel equal to the mean of the
window value (\fIN\fR0), subtract mean from from pixel (\fIN\fR1) add
(\fIN\fR2), multiply (\fIN\fR3) or divide (\fIN\fR4)
.TP
\fB-r \fIN\fR
Number of rows \fIN\fR that contains the image.
.TP
\fB-t \fIN\fR | \fB--threshold \fIN\fR
In case of using \fBclip\fR: threshold value to be set to zero
.TP
\fB-v\fR | \fB--version\fP
Print version information on standard output, then exit successfully.
.TP
\fB-w \fIN\fR
window size (default: 15)
.TP
.SH SEE ALSO
gpivtools
.SH AUTHOR
Gerber Van der Graaf
|
