1 .TH GPIV_SCALE 1 "8 November 2006"
3 gpiv_scale \- Scaling of PIV data.
7 [\fB-h\fR | \fB--help\fR]
8 [\fB-p\fR | \fB--print\fR]
9 [\fB-s \fIM\fR |\fB-S \fIM\fR]
10 [\fB-t \fIdT\fR |\fB-T \fIdT\fR]
11 [\fB-v\fR | \fB--version\fR]
15 < \fIstdin\fR > \fIstdout\fR
21 \fBgpiv_scale\fP applies the image magnification and the time between
22 successive recordings to the PIV estimators. This results that
23 particle displacements [px] are modified to velocities [m/s] and their
24 positions from [px] to [m]. A physical reference for the positions of
25 the PIV data can be applied by means of the image zero-offset option.
27 If \fIfilename\fR is used, the parameters and options to be used for
28 \fBgpiv_scale\fP are subsequently read from the image header
29 (\fIfilename\fB.h\fR in case of raw binary images) or from the
30 configuration resources (containing the \fBIMG\fR and \fBPOST\fR
31 keys). The parameters may be overruled by the command line options, as
36 \fB-h\fR | \fB--help\fP
40 \fB-p\fR | \fB--print\fP
41 Prints parameters, command line options and input and output filenames
42 to stdout. The output is identic of \fIfilename\fB.par\fR, in case
47 spatial scaling with magnification factor \fIM\fR [m/px]
51 Inverse spatial scaling with magnification factor \fIM\fR [m/px]; returns
52 scaled data to their original magnitudes.
55 \fB-v\fR | \fB--version\fP
56 Prints version information on standard output, then exits successfully.
60 Translates particle displacements into velocities by devising them
61 with the time between subsequent recordings \fIdT\fR [s].
65 Inverse time scaling. Returns velocities into displacements [px]
69 Relates the positions of the observations of velocities/displacements
70 to a physical location in the experiment by image zero offsetting. \fIx0
71 y0\fR denote the physical position of pixel (0,0) in the image.
75 Input PIV file. Overrides stdin and stdout. The output will be
76 written to \fIfilename\fB.sc.piv\fR. Parameters are stored in
77 \fIfilename\fB.par\fR and may be used for future use by including them
91 The program has been tested for PIV data. So far, no bugs have been