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Special Forums News, Links, Events and Announcements Software Releases - RSS News Parallel Three-Dimensional Fast Fourier Transforms 2.3.1 (Default branch)
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Old 11-26-2008
Parallel Three-Dimensional Fast Fourier Transforms 2.3.1 (Default branch)
Parallel Three-Dimensional Fast Fourier Transforms, dubbed P3DFFT, is a library for computing 3D FFTs using 2D (pencil) decomposition. It is written using Fortran with MPI, and is tuned to work on multiple single-CPU systems (up to 32768 of them). It is built to leverage high-performance serial 1D FFT libraries, such as FFTW or ESSL.License: Public DomainChanges:
An option has been added to overwrite the(complex) input array when using thecomplex-to-real transform with FFTW. An option hasbeen added to use data layout using unit-stride onoutput of the real-to-complex routine, i.e.(Z,X,Y) ordering.Image

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gpiv_imgproc

GPIV_IMGPROC(1) 					      General Commands Manual						   GPIV_IMGPROC(1)

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] [file-
       name] < 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. Param-
	      eters 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

								  7 November 2006						   GPIV_IMGPROC(1)