Developer Reference

  • 2021
  • 01/15/2021
  • Public Content
Contents

RGBToYCbCr

Converts an RGB image to the YCbCr color model.

Syntax

Case 1: Operation on pixel-order data
IppStatus ippiRGBToYCbCr_<mod>(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
Supported values for
mod
:
8u_C3R
8u_AC4R
Case 2: Operation on planar data
IppStatus ippiRGBToYCbCr_8u_P3R(const Ipp8u*
pSrc
[3], int
srcStep
, Ipp8u*
pDst
[3], int
dstStep
, IppiSize
roiSize
);
Case 3: Conversion from pixel-order to planar data
IppStatus ippiRGBToYCbCr_<mod>(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
[3], int
dstStep
, IppiSize
roiSize
);
Supported values for
mod
:
8u_C3P3R
8u_AC4P3R
Include Files
ippcc.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 for a pixel-order image. An array of pointers to ROI in each separate source color planes for planar images.
srcStep
Distance in bytes between starts of consecutive lines in the source image.
pDst
Pointer to the destination imnage ROI. Array of pointers to ROI in the separate destination color planes for planar images.
dstStep
Distance in bytes between starts of consecutive lines in the destination image.
roiSize
Size of the source and destination ROI in pixels.
Description
This function operates with ROI (see Regions of Interest in Intel IPP).
This function converts the gamma-corrected
R'G'B'
image
pSrc
with values in the range [0..255] to the
Y'Cb'Cr'
image
pDst
according to the following formulas:
Y' = 0.257*R' + 0.504*G' + 0.098*B' + 16
Cb' = -0.148*R' - 0.291*G' + 0.439*B' + 128
Cr' = 0.439*R' - 0.368*G' - 0.071*B' + 128
In the
YCbCr
model,
Y
is defined to have a nominal range [16..235], while
Cb
and
Cr
are defined to have a range [16..240], with the value of 128 as corresponding to zero.
Both the source and destination images have the same bit depth.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error or a warning.
ippStsNullPtrErr
Indicates an error condition if
pSrc
or
pDst
is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
has a field with a zero or negative value.

Product and Performance Information

1

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