36 lines
1.3 KiB
Groff
36 lines
1.3 KiB
Groff
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.TH IM_FOURFLT 3 "10 May 1991"
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.SH NAME
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im_freqflt \- filters an image with a float filter mask in the frequency domain
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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.B int im_freqflt(in, filtermask, out)
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.br
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IMAGE *in, *filtermask, *out;
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.SH DESCRIPTION
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im_freqflt() performs filtering in the frequency domain of the input image
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held by the image descriptor in with a mask held by the descriptor filtermask
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and writes the result on the image descriptor out.
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Image sizes should be power of two and less or equal to 512. All images
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should be one channel square images. Image filtermask is a non-complex one
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channel image created by im_create_fmask(). Input image can be any type. If
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input is complex, in and filtermask are multiplied using the function
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im_cmultim(3).
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If input is not complex then it is transformed into the frequency domain and
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then it is multiplied with the filtermask. In the latter case the result is
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inverse fourier transformed and clipped to the input image format using the
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function im_clip2fmt(3).
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.SH RETURN VALUE
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The function returns 0 on success and -1 on error.
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.SH BUGS
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The function has not been fully tested.
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.SH SEE\ ALSO
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im_fwfft(3), im_invfft(3), im_create_fmask(3), im_cmultim(3).
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.SH COPYRIGHT
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.br
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N. Dessipris
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.SH AUTHOR
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N. Dessipris \- 10/05/1991
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