mlib_ImageSobel(3MLIB) mediaLib Library Functions mlib_ImageSobel(3MLIB)NAME
mlib_ImageSobel, mlib_ImageSobel_Fp - Sobel filter
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageSobel(mlib_image *dst, const mlib_image *src,
mlib_s32 cmask, mlib_edge edge);
mlib_status mlib_ImageSobel_Fp(mlib_image *dst, const mlib_image *src,
mlib_s32 cmask, mlib_edge edge);
DESCRIPTION
Each function is a special case of the gradient filter, which is an
edge detector which computes the magnitude of the image gradient vector
in two orthogonal directions. In this case, the gradient filter uses
specific horizontal and vertical masks.
The Sobel filter is one of the special cases of gradient filter using
the following horizontal and vertical masks:
hmask = { -1.0, 0.0, 1.0,
-2.0, 0.0, 2.0,
-1.0, 0.0, 1.0 }
vmask = { -1.0, -2.0, -1.0,
0.0, 0.0, 0.0,
1.0, 2.0, 1.0 }
PARAMETERS
Each function takes the following arguments:
dst Pointer to destination image.
src Pointer to source image.
cmask Channel mask to indicate the channels to be processed, each
bit of which represents a channel in the image. The channels
corresponding to 1 bits are those to be processed. For a sin‐
gle channel image, the channel mask is ignored.
edge Type of edge condition. It can be one of the following:
MLIB_EDGE_DST_NO_WRITE
MLIB_EDGE_DS_FILL_ZERO
MLIB_EDGE_DST_COPY_SRC
MLIB_EDGE_SR_EXTEND
RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns
MLIB_FAILURE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOmlib_ImageGradient3x3(3MLIB), mlib_ImageGradient3x3_Fp(3MLIB),
attributes(5)SunOS 5.10 2 Mar 2007 mlib_ImageSobel(3MLIB)
