Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference

ID 790148
Date 3/22/2024
Public
Document Table of Contents

FilterMedian

Filters an image using a median filter.

Syntax

IppStatus ippiFilterMedian_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDst, int dstStep, IppiSize dstRoiSize, IppiSize maskSize, IppiPoint anchor, Ipp8u* pBuffer);

Supported values for mod:

32f_C3R
32f_C4R
64f_C1R

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.

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.

maskSize

Size of the mask in pixels.

anchor

Anchor cell specifying the mask alignment with respect to the position of the input pixel.

pBuffer

Pointer to the external work buffer.

Description

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

This function sets each pixel in the output buffer as the median value of all the input pixel values taken in the neighborhood of the processed pixel. To ensure valid operation when image boundary pixels are processed, the application should correctly define additional border pixels (see Borders in Neighborhood Operations). The anchor cell is specified by its coordinates anchor.x and anchor.y in the coordinate system associated with the top left corner of the kernel. The size of the source image ROI is equal to the size of the destination image ROI dstRoiSize.

Some flavors of the function require the external buffer pBuffer. Prior to using this functions, compute the size of the external buffer by using the function FilterMedianGetBufferSize.

Return Values

ippStsNoErr

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

ippStsNullPtrErr

Indicates an error if pSrc or pDst is NULL.

ippStsSizeErr

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

ippStsStepErr

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

ippStsMaskSizeErr

Indicates an error if maskSize has a field with zero, negative, or even value.

ippStsAnchorErr

Indicates an error if anchor is outside the mask size.