Visible to Intel only — GUID: GUID-E5EDF4EA-B385-42C9-95B2-F7D43E9579BC
Visible to Intel only — GUID: GUID-E5EDF4EA-B385-42C9-95B2-F7D43E9579BC
MaxIndx
Computes the maximum of image pixel values and retrieves the x and y coordinates of pixels with maximal intensity values.
Syntax
Case 1: Operation on one-channel data
IppStatus ippiMaxIndx_<mod>(const Ipp<datatype>* pSrc, int srcStep, IppiSize roiSize, Ipp<datatype>* pMax, int* pIndexX, int* pIndexY);
Supported values for mod:
8u_C1R |
16u_C1R |
16s_C1R |
32f_C1R |
Case 2: Operation on multi-channel data
IppStatus ippiMaxIndx_<mod>(const Ipp<datatype>* pSrc, int srcStep, IppiSize roiSize, Ipp<datatype> max[3], int indexX[3], int indexY[3]);
Supported values for mod:
8u_C3R |
16u_C3R |
16s_C3R |
32f_C3R |
8u_AC4R |
16u_AC4R |
16s_AC4R |
32f_AC4R |
IppStatus ippiMaxIndx_<mod>(const Ipp<datatype>* pSrc, int srcStep, IppiSize roiSize, Ipp<datatype> max[4], int indexX[4], int indexY[4]);
Supported values for mod:
8u_C4R |
16s_C4R |
16u_C4R |
32f_C4R |
Include Files
ippi.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Parameters
pSrc |
Pointer to the source image ROI. |
srcStep |
Distance in bytes between starts of consecutive lines in the source image. |
roiSize |
Size of the source ROI in pixels. |
pMax |
Pointer to the maximum pixel value (for one-channel data). |
max |
Array containing maximum channel values of pixels in the source buffer (for multi-channel data). |
pIndexX, pIndexY |
Pointers to the x and y coordinates of the pixel with maximum value. |
indexX, indexY |
Arrays containing the x and y coordinates of pixels with maximum channel values. |
Description
This function operates with ROI (see Regions of Interest in Intel IPP). This function computes the maximum pixel value pMax for the source image pSrc. In case of a multi-channel image, the maximum is computed over each channel and stored in the array max. The function also retrieves the x and y coordinates of pixels on which the maximum is reached. If several pixels have equal maximum values, the coordinates of the first pixel from the start of the source buffer is returned. For multi-channel data, indexX[k]and indexY[k]are the x and y coordinates of the pixel that has the maximal intensity value of the k-th channel, k = 1,2,3,4.
Return Values
ippStsNoErr |
Indicates no error. Any other value indicates an error or a warning. |
ippStsNullPtrErr |
Indicates an error condition if any of pSrc,pMax, pIndexX, or pIndexY pointers is NULL. |
ippStsSizeErr |
Indicates an error condition if roiSize has a field with zero or negative value. |
Example
The code example below demonstrates how to use the function ippiMaxIndx.
Ipp8u src[4*1] = { 40, 20, 60, 80 }; IppiSize roiSize = { 4, 1 }; Ipp8u max; int IndexX; int IndexY; ippiMaxIndx_8u_C1R ( src, 4, roiSize, &max, &IndexX, &IndexY );
Output:
max = 80 IndexX = 3 IndexY = 0