Intel® Integrated Performance Primitives Developer Guide and Reference

ID 790148
Date 11/07/2023
Public

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Document Table of Contents

CompareEqualEps

Compares two images with floating-point data, testing whether pixel values are equal within a certain tolerance eps.

Syntax

IppStatus ippiCompareEqualEps_<mod>(const Ipp32f* pSrc1, int src1Step, const Ipp32f* pSrc2, int src2Step, Ipp8u* pDst, int dstStep, IppiSize roiSize, Ipp32f eps);

Supported values for mod:

32f_C1R

32f_C3R

32f_C4R

IppStatus ippiCompareEqualEps_32f_AC4R(const Ipp32f* pSrc1, int src1Step, const Ipp32f* pSrc2, int src2Step, Ipp8u* pDst, int dstStep, IppiSize roiSize, Ipp32f eps);

Include Files

ippi.h

Domain Dependencies

Headers: ippcore.h, ippvm.h, ipps.h

Libraries: ippcore.lib, ippvm.lib, ipps.lib

Parameters

pSrc1, pSrc2

Pointers to the source image ROIs.

src1Step, src2Step

Distances in bytes between starts of consecutive lines in the source images.

pDst

Pointer to the destination image ROI.

dstStep

Distance in bytes between starts of consecutive lines in the destination image.

roiSize

Size of the source and destination ROI in pixels.

eps

The tolerance value.

Description

This function operates with ROI (see Regions of Interest in Intel IPP).

This function tests if the corresponding pixels of ROI in two source images pSrc1, pSrc2 are equal within the tolerance eps, and writes the results to a one-channel Ipp8u image pDst. If the absolute value of difference of the pixel values in pSrc1 and pSrc2 is less than or equal to eps, then the corresponding pixel in pDst is set to an IPP_MAX_8U value; otherwise the pixel in pDst is set to 0. For multi-channel images, the differences for all color channel values of a pixel must be within the eps tolerance for the compare condition to be true.

This function processes images with floating-point data only.

Return Values

ippStsNoErr

Indicates no error. Any other value indicates an error or a warning.

ippStsNullPtrErr

Indicates an error condition if one of the specified pointer is NULL.

ippStsSizeErr

Indicates an error condition if roiSize has a field with zero or negative value.

ippStsStepErr

Indicates an error condition if src1Step, src2Step, or dstStep has a zero or negative value.

ippStsEpsValErr

Indicates an error condition if eps has a negative value.