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mlib_imagegradientmxn_fp(3mlib) [opensolaris man page]

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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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 corresponding 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 |Evolving | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mlib_ImageGradientMxN(3MLIB), mlib_ImageGradient3x3(3MLIB), mlib_ImageGradient3x3_Fp(3MLIB), attributes(5) SunOS 5.10 10 Nov 2004 mlib_ImageGradientMxN_Fp(3MLIB)

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