Filters an image using a horizontal Roberts kernel.
IppStatus ippiFilterRobertsDown_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDst, int dstStep, IppiSize dstRoiSize);
Supported values for mod:
8u_C1R | 16s_C1R | 32f_C1R |
8u_C3R | 16s_C3R | 32f_C3R |
8u_AC4R | 16s_AC4R | 32f_AC4R |
pSrc |
Pointer to the source image ROI. |
srcStep |
Distance in bytes between starts of consecutive lines in the source image. |
pDst |
Pointer to the destination image ROI. |
dstStep |
Distance in bytes between starts of consecutive lines in the destination image. |
dstRoiSize |
Size of the source and destination ROI in pixels. |
The function ippiFilterRobertsDown is declared in the ippi.h file. It operates with ROI (see Regions of Interest in Intel IPP). This function applies a horizontal Roberts operator to an image ROI. The corresponding kernel is the matrix of 3x3 size with the following values:
0 0 0
0 1 0
0 0 -1
The anchor cell is the center cell of the kernel (red). The size of the source image ROI is equal to dstRoiSize, the size of the destination image ROI.
This filter gives the gross approximation of the pixel values' gradient in the horizontal direction.
To ensure valid operation when image boundary pixels are processed, the application should correctly define additional border pixels (see Borders).
ippStsNoErr |
Indicates no error. Any other value indicates an error or a warning. |
ippStsNullPtrErr |
Indicates an error condition if pSrc or pDst is NULL. |
ippStsSizeErr |
Indicates an error condition if dstRoiSize has a field with a zero or negative value. |
ippStsStepErr |
Indicates an error condition if srcStep or dstStep has a zero or negative value. |
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