Tests whether floating-point pixel values of an image are equal to a given value within a certain tolerance eps.

Syntax

Case 1: Operation on one-channel data

IppStatus ippiCompareEqualEpsC_32f_C1R(const Ipp32f* pSrc, int srcStep, Ipp32f value, Ipp8u* pDst, int dstStep, IppiSize roiSize, Ipp32f eps);

Case 2: Operation on multi-channel data

IppStatus ippiCompareEqualEpsC_32f_C3R(const Ipp32f* pSrc, int srcStep, const Ipp32f value[3], Ipp8u* pDst, int dstStep, IppiSize roiSize, Ipp32f eps);

IppStatus ippiCompareEqualEpsC_32f_C4R(const Ipp32f* pSrc, int srcStep, const Ipp32f value[4], Ipp8u* pDst, int dstStep, IppiSize roiSize, Ipp32f eps);

IppStatus ippiCompareEqualEpsC_32f_AC4R(const Ipp32f* pSrc, int srcStep, const Ipp32f value[3], 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

pSrc

Pointer to the source image ROI.

srcStep

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

value

The value to compare each pixel to. In case of multi-channel data, an array of separate values (one for each channel).

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 pixel values of the source image ROI pSrc are equal to a given constant value within the tolerance eps, and writes the results to a one-channel Ipp8u image pDst. If the absolute value of difference between the pixel value in pSrc and value 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 between all color channel values of a pixel and the respective components of value must be within the tolerance eps 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 a zero or negative value.

ippStsStepErr

Indicates an error condition if srcStep or dstStep has a zero or negative value.

ippStsEpsValErr

Indicates an error condition if eps has a negative value.
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