Developer Reference

  • 2020
  • 10/21/2020
  • Public Content
Contents

FilterMedianColor

Filters an image using a color median filter.

Syntax

IppStatus ippiFilterMedianColor_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, Ipp<datatype>*
pDst
, int
dstStep
, IppiSize
dstRoiSize
, IppiMaskSize
mask
);
Supported values for
mod
:
8u_C3R
16s_C3R
32f_C3R
8u_AC4R
16s_AC4R
32f_AC4R
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.
mask
Predefined mask of the
IppiMaskSize
type.
Description
This function operates with ROI (see Regions of Interest in Intel IPP).
When applied to a color image, the previously described median filtering functions process color planes of an image separately, and as a result any correlation between color components is lost. If you want to preserve this information, use the
ippiFilterMedianColor
function instead. For each input pixel, this function computes differences between red (R), green (G), and blue (B) color components of pixels in the
mask
neighborhood and the input pixel. The distance between the input pixel
i
and the neighborhood pixel
j
is formed as the sum of absolute values:
abs (R(i)-R(j)) + abs (G(i)-G(j)) + abs (B(i)-B(j))
After scanning the entire neighborhood, the function sets the output value for pixel
i
as the value of the neighborhood pixel with the smallest distance to
i
.
The function
ippiFilterMedianColor
supports square masks of size either
ippMskSize3x3
or
ippMskSize5x5
and processes color images only. To ensure valid operation when image boundary pixels are processed, the application should correctly define additional border pixels (see Borders in Neighborhood Operations).
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
mask
has an illegal value.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.