Intel® Integrated Performance Primitives Developer Guide and Reference

ID 790148
Date 11/07/2023
Public

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Document Table of Contents

CopySubpix

Copies pixel values between two images with subpixel precision.

Syntax

Case 1: Copying without conversion or with conversion to floating point data

IppStatus ippiCopySubpix_<mod>(const Ipp<srcDatatype>* pSrc, int srcStep, Ipp<dstDatatype>* pDst, int dstStep, IppiSize roiSize, Ipp32f dx, Ipp32f dy);

Supported values for mod:

8u_C1R 16u_C1R 32f_C1R
8u32f_C1R 16u32f_C1R  

Case 2: Copying with conversion to integer data

IppStatus ippiCopySubpix_8u16u_C1R_Sfs(const Ipp8u* pSrc, int srcStep, Ipp16u* pDst, int dstStep, IppiSize roiSize, Ipp32f dx, Ipp32f dy, int scaleFactor);

Include Files

ippcv.h

Domain Dependencies

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

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

Parameters

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.

roiSize

Size of the source and destination ROI in pixels.

dx

Fractional part of the x-coordinate in the source image.

dy

Fractional part of the y-coordinate in the source image.

scaleFactor

Scale factor (see Integer Result Scaling).

Description

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

This function computes the pixel value of the destination image using linear interpolation (see Linear Interpolation in Appendix B) in accordance with the following formula:



where i = 0, ... roiSize.height - 1 , j = 0, ... roiSize.width - 1 .

Return Values

ippStsNoErr

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

ippStsNullPtrErr

Indicates an error when any of the specified pointers 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 is less than roiSize.width * <pixelSize>.

ippStsNotEvenStepErr

Indicates an error condition if one of srcStep or dstStep is not divisible by 4 for floating point images, or by 2 for short integer images.