mlib_ImageConv4x4Index - 4x4 convolution on a color indexed image
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#include <mlib.h>
mlib_status mlib_ImageConv4x4Index(mlib_image *dst, const mlib_image *src,
const mlib_s32 *kernel, mlib_s32 scale, mlib_edge edge,
const void *colormap);
The mlib_ImageConv4x4Index() function performs a 4x4 convolution on the color indexed source image by using the user-supplied kernel.
The input and output images must have the same image type and size.
For this convolution, the key element of the convolution kernel is located at (1, 1) of the kernel matrix.
This function performs the convolution on color indexed image. The input image and the output image must be single channel images. The image type must be MLIB_BYTE or MLIB_SHORT.
It uses the following equation:
m-1-dm n-1-dn
dst[x][y][i] = SUM SUM src[x+p][y+q][i]*k[p][q]*2**(-scale)
p=-dm q=-dn
where m = 4, n = 4, dm = (m - 1)/2 = 1, dn = (n - 1)/2 = 1.
The function takes the following arguments:
Pointer to destination image.
Pointer to source image.
Pointer to the convolution kernel, in row major order.
Scaling factor.
Type of edge condition. It can be one of the following:
MLIB_EDGE_DST_NO_WRITE MLIB_EDGE_DST_FILL_ZERO MLIB_EDGE_DST_COPY_SRC MLIB_EDGE_SRC_EXTEND
Internal data structure for inverse color mapping. This data structure is generated by the mlib_ImageColorTrue2IndexInit() function.
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
See attributes(5) for descriptions of the following attributes:
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mlib_ImageConv2x2(3MLIB), mlib_ImageConv2x2_Fp(3MLIB), mlib_ImageConv2x2Index(3MLIB), mlib_ImageConv3x3(3MLIB), mlib_ImageConv3x3_Fp(3MLIB), mlib_ImageConv3x3Index(3MLIB), mlib_ImageConv4x4(3MLIB), mlib_ImageConv4x4_Fp(3MLIB), mlib_ImageConv5x5(3MLIB), mlib_ImageConv5x5_Fp(3MLIB), mlib_ImageConv5x5Index(3MLIB), mlib_ImageConv7x7(3MLIB), mlib_ImageConv7x7_Fp(3MLIB), mlib_ImageConv7x7Index(3MLIB), mlib_ImageConvKernelConvert(3MLIB), mlib_ImageConvMxN(3MLIB), mlib_ImageConvMxN_Fp(3MLIB), mlib_ImageConvMxNIndex(3MLIB), mlib_ImageConvolveMxN(3MLIB), mlib_ImageConvolveMxN_Fp(3MLIB), mlib_ImageSConv3x3(3MLIB), mlib_ImageSConv3x3_Fp(3MLIB), mlib_ImageSConv5x5(3MLIB), mlib_ImageSConv5x5_Fp(3MLIB), mlib_ImageSConv7x7(3MLIB), mlib_ImageSConv7x7_Fp(3MLIB), mlib_ImageSConvKernelConvert(3MLIB), attributes(5)