30 lines
977 B
Groff
30 lines
977 B
Groff
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.TH IM_GRAD_X 3 "08 January 2008"
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.SH NAME
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im_grad_x, im_grad_y \- find horizontal or vertical differences
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.SH SYNOPSIS
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.nf
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.B #include <vips/vips.h>
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.sp
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.BI "int im_grad_x( IMAGE " "*in" ", IMAGE " "*out" " );
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.br
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.BI "int im_grad_y( IMAGE " "*in" ", IMAGE " "*out" " );
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.fi
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.SH DESCRIPTION
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.B im_grad_x(3)
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generates an image where the value of each pixel is the difference between horizontally ajacent pixels in the input
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image. The output has the same height as the input and one pixel less width.
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.PP
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.B im_grad_y(3)
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generates an image where the value of each pixel is the difference between vertically ajacent pixels in the input
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image. The output has the same width as the input and one pixel less height.
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.PP
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In both cases, the input can be any uncoded integer type, and the output is signed 32 bit integer.
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.SH RETURN VALUE
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The functions returns 0 on success and -1 on error.
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.SH COPYRIGHT
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.br
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Copyright 2008, Nottingham Trent University.
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.SH AUTHOR
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Tom Vajzovic
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