NAME
osiv - open source imaging velocimetry
SYNOPSIS
osiv [ arg=... ] [ ppr=... ]
[...]
DESCRIPTION
osiv is a program for performing
efficient analysis of PIV images. It provides a variety of
algorithms for pre-processing, interpolation, and cross-correlation
of images. This page will serve as a quick reference location, more
information can be found in the online manual.
OPTIONS
- prn=STRING - parameter file name
- mvn=STRING - movie file name
- The movie type will be inferred from the file extension,
namely:
.dat - binary data
.tif - TIFF file
.tiff - TIFF file
If file is "-", data will be read from stdin and assumed to be raw
binary.
- dtn=STRING - output file name
- If file is "-", data will be written to stdout.
- alg=INTEGER - cross-correlation algorithm
- The integer takes the following interpretation:
1 - Direct Least Squares
2 - Direct Least Squares (Non-Redundant)
3 - Direct Cross Correlation
4 - Direct Cross Correlation (Non-Redundant)
5 - FFT Cross Correlation
6 - FFT Cross Correlation (Less-Redundant)
7 - Minimum Quadratic Difference
8 - Iterative FFT Correlation
- ppr=INTEGER - pre-processing algorithm
- The integer takes the following interpretation:
0 - No pre-processing
1 - Subtract to minima
2 - Add to maxima
3 - Stretch to limits
4 - Stretch to variance
5 - Stretch to average
- itp=INTEGER - interpolation algorithm
- The integer takes the following interpretation:
0 - No interpolation
1 - Gaussian
2 - Parabolic
3 - Paraboloidal
4 - Centroid
- szx=INTEGER - image width
- szy=INTEGER - image height
- stx=INTEGER - x start of grid
- A value of zero denotes the left of the image.
- sty=INTEGER - y start of grid
- A value of zero denotes the top of the image.
- spx=INTEGER - x grid spacing
- A value of one places a window at every pixel column.
- spy=INTEGER - y grid spacing
- A value of one places a window at every pixel row.
- nmx=INTEGER - x grid length
- nmy=INTEGER - y grid length
- ofx=INTEGER - x window offset
- ofy=INTEGER - y window offset
- wsx=INTEGER - x window size
- Powers of two allow efficient FFT algorithms, but are not
necessary.
- wsy=INTEGER - y window size
- Powers of two allow efficient FFT algorithms, but are not
necessary.
- wlx=INTEGER - x super window size
- This argument only has meaning for the minimum quadratic
difference algorithm.
- wly=INTEGER - y super window size
- This argument only has meaning for the minimum quadratic
difference algorithm.
- mdx=INTEGER - x maximum window displacement
- mdy=INTEGER - y maximum window displacement
- sfr=INTEGER - start frame
- efr=INTEGER - end frame
- skp=INTEGER - frame skipping
- set=INTEGER - frame set
- nit=INTEGER - number of iterations
- This argument only has meaning for iterative fft cross
correlation.
- wsd=STRING - wisdom file name
- Wisdom can be generated by the program osiv_mkwsd
- wmp=INTEGER - write map switch
- A value of "1" denotes "yes", a value of anything else denotes
"no". The default value is "no".
SEE ALSO
osiv_getargs(1),
osiv_getvects(1),
osiv_getmap(1),
osiv_draw(1),
osiv_mkwsd(1),
readovd(1).
BUGS
Let me know, my email address is jamesas@uclink.berkeley.edu.
COPYRIGHT NOTICE
Copyright © 2002 James Strother.