Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

RGBToYUV422

Converts an RGB image to the YUV color model; uses 4:2:2 sampling.

Syntax

Case 1: Operation on pixel-order data
IppStatus ippiRGBToYUV422_8u_C3C2R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
Case 2: Operation on planar data with ROI
IppStatus ippiRGBToYUV422_8u_P3R(const Ipp8u*
pSrc
[3], int
srcStep
, Ipp8u*
pDst
[3], int
dstStep
[3], IppiSize
roiSize
);
Case 3: Operation on planar data without ROI
IppStatus ippiRGBToYUV422_8u_P3(const Ipp8u*
pSrc
[3], Ipp8u*
pDst
[3], IppiSize
imgSize
);
Case 4: Conversion from pixel-order to planar data with ROI
IppStatus ippiRGBToYUV422_8u_C3P3R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
[3], int
dstStep
[3], IppiSize
roiSize
);
Case 5: Conversion from pixel-order to planar data without ROI
IppStatus ippiRGBToYUV422_8u_C3P3(const Ipp8u*
pSrc
, Ipp8u*
pDst
[3], IppiSize
imgSize
);
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 buffer for pixel-order image. An array of pointers to the source image buffer in each color plane for planar image.
srcStep
Distance in bytes between starts of consecutive lines in the source image for operations with ROI.
pDst
Pointer to the destination image buffer for pixel-order image. An array of pointers to the destination image buffer in each color plane for planar image.
dstStep
Distance in bytes between starts of consecutive lines in the destination image for operations with ROI. An array of three values for planar image.
roiSize
Size of the source and destination ROI in pixels.
imgSize
Size of the source and destination images in pixels for operations without ROI.
Description
This function converts the gamma-corrected
R'G'B'
image
pSrc
to the
Y'U'V'
image
pDst
with 4:2:2 sampling format, according to the same formulas as the function
ippiRGBToYUV
does. For more details on this sampling format, see Table
“Pixel-Order Image Formats”
and Table
“Planar Image Formats”
.
For digital RGB values in the range [0..255],
Y'
has the range [0..255],
U
varies in the range [-112..+112], and
V
in the range [-157..+157]. To fit in the range of [0..255], the constant value 128 is added to computed
U
and
V
values, and
V
is then saturated.
Some function flavors operates with ROI (see Regions of Interest in Intel IPP). The function flavors that does not use ROI operate on the assumption that both the source and destination images have the same size and occupy a contiguous memory area, which means that image rows are not padded with zeroes. In this case the step parameters are not needed.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error or a warning.
ippStsNullPtrErr
Indicates an error condition if
pSrc
or
pDst
pointer is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
or
imgSize
has a field with a zero or negative value.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804