BGR565ToYCbCr422, BGR555ToYCbCr422

Converts 16-bit per pixel BGR image to 16-bit per pixel YCbCr image.

Syntax

Case 1: Operation on pixel-order data

IppStatus ippiBGR565ToYCbCr422_16u8u_C3C2R(const Ipp16u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize);

IppStatus ippiBGR555ToYCbCr422_16u8u_C3C2R(const Ipp16u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize);

Case 2: Conversion from pixel-order to planar data

IppStatus ippiBGR565ToYCbCr422_16u8u_C3P3R(const Ipp16u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);

IppStatus ippiBGR555ToYCbCr422_16u8u_C3P3R(const Ipp16u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);

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 ROI in the destination pixel-order image. An array of pointers to ROI in each planes of the destination planar image.
dstStep	Distance in bytes between starts of consecutive lines in the destination pixel-order image. An array of distances in bytes for each plane of the destination planar image.
roiSize	Size of the source and destination ROI in pixels.

Description

The functions ippiBGR565ToYCbCr422 and ippiBGR555ToYCbCr422 are declared in the ippcc.h file. They operate with ROI (see Regions of Interest in Intel IPP).

These functions convert a three- or four-channel gamma-corrected B'G'R' image pSrc to the two-channel or three-planes Y'Cb'Cr' image pDst according to the same formulas as the function ippiRGBToYCbCr does. The difference is that these functions use 4:2:2 sampling format (see Table “Pixel-Order Image Formats” and Table “Planar Image Formats” for more details).

The source image pSrc is a packed 16-bit BGR image with reduced bit depth; all 3 channel intensities for a pixel are packed into two consecutive bytes (16u data type). It can be in one of two possible formats (see Figure 16-bit Pixel Formats for more details): BGR565 (5 bits for blue, 6 bits for green, 5 bits for red), and BGR555 (5 bits for blue, green, red).

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.width is less than 2 or roiSize.height is less than 1.