V3FFT | VisionX V4 |
v3fft − 3D Fast Fourier Transform (FFT)
SYNOPSISv3fft [if=<infile>] [of=<outfile>] [-i] [-m] [-v]
DESCRIPTIONv3fft computes three-dimensional FFT of the image. All computations are conducted in single precision floating point arithmetic and the result is a two channel (real, imaginary) image. By default, the input is modulated so that the origin of the frequency domain is located in the center of the image. The FFT is computed separately for each dimension. If a dimension of the input image is not a power of two, the image is padded with zeros along this dimension. The FFT (or inverse FFT) operation is normalized by 1/sqrt(n).
OPTIONS|
if= |
input image file: either single or two channel image | ||
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of= |
output file: two channel floating point image | ||
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-i |
specifies the inverse FFT operation | ||
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-m |
inhibits the modulation by -1 ^ (x + y + z); therefore, the zero frequency term is located at image location (0, 0, 0) | ||
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-v |
verbose mode; gives some runtime information |
v3fftw(1), vfft(1)
AUTHORSergei Fotin, August 2008