48 lines
1.1 KiB
Groff
48 lines
1.1 KiB
Groff
.TH IM_EYE 3 "10 May 1991"
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.SH NAME
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im_eye, im_feye \- creates a pattern which shows the spatial response of the human visual system
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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.B int im_eye(image, xsize, ysize, factor)
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.br
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.B IMAGE *image;
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.br
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.B int xsize, ysize;
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.br
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.B double factor;
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.B int im_feye(image, xsize, ysize, factor)
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.br
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.B IMAGE *image;
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.br
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.B int xsize, ysize;
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.br
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.B double factor;
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.SH DESCRIPTION
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.B im_feye()
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creates an one band float image with pels in [-1,+1] of a pattern which has
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the following properties:
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.br
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- the spatial frequency increases from left to right.
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.br
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- the grey level intensity decreases from top to bottom.
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.br
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The sizes of the produced image are determined by the entered arguments
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xsize and ysize. The variable factor which should be between 0 and 1,
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determines the number of maximum spatial frequencies present along the
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horizontal direction.
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.B im_eye()
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behaves exactly as im_feye(), but scales the output to [0,255].
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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 SEE ALSO
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im_grey(3), im_zone(3).
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.SH COPYRIGHT
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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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