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mlib_imagesobel(3mlib) [opensolaris man page]

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 corre- sponding to 1 bits are those to be processed. For a single 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 ALSO
mlib_ImageGradient3x3(3MLIB), mlib_ImageGradient3x3_Fp(3MLIB), attributes(5) SunOS 5.11 2 Mar 2007 mlib_ImageSobel(3MLIB)

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mlib_ImageGradientMxN_Fp(3MLIB) 			    mediaLib Library Functions				   mlib_ImageGradientMxN_Fp(3MLIB)

NAME
mlib_ImageGradientMxN_Fp - MxN gradient filter SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_ImageGradientMxN_Fp(mlib_image *dst, const mlib_image *src, const mlib_d64 *hmask, const mlib_d64 *vmask, mlib_s32 m, mlib_s32 n, mlib_s32 dm, mlib_s32 dn, mlib_s32 cmask, mlib_edge edge); DESCRIPTION
The mlib_ImageGradientMxN_Fp() function performs floating-point edge detection by computing the magnitude of the image gradient vector in two orthogonal directions using MxN gradient filtering. It uses the following equation: dst[x][y][i] = ( SH(x,y,i)**2 + SV(x,y,i)**2 )**0.5 where SH() and SV() are the horizontal and vertical gradient images generated from the corresponding channel of the source image by corre- lating it with the supplied orthogonal (horizontal and vertical) gradient masks. PARAMETERS
The function takes the following arguments: dst Pointer to destination image. src Pointer to source image. hmask Pointer to horizontal mask in row-major order. vmask Pointer to vertical mask in row-major order. m Width of the convolution kernel. m > 1. n Height of the convolution kernel. n > 1. dm X coordinate of the key element in the convolution kernel. 0 <= dm < m. dn Y coordinate of the key element in the convolution kernel. 0 <= dn < n. cmask Channel mask to indicate the channels to be convolved, each bit of which represents a channel in the image. The channels corre- sponding to 1 bits are those to be processed. For a single 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 ALSO
mlib_ImageGradientMxN(3MLIB), mlib_ImageGradient3x3(3MLIB), mlib_ImageGradient3x3_Fp(3MLIB), attributes(5) SunOS 5.11 2 Mar 2007 mlib_ImageGradientMxN_Fp(3MLIB)
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