How to get detail conversion of ippiYCbCr422ToBGR_8u_C2C3R ?

[Peter_L_8]

Hello everyone, 

I would like to do image processing and need to know the detail of ippiYCbCr422ToBGR_8u_C2C3R.

such as 

Y'= 0.299*R' + 0.587*G' + 0.114*B'

U'= -0.147*R' - 0.289*G' + 0.436*B' = 0.492*(B'- Y') V'= 0.615*R' - 0.515*G' - 0.100*B' = 0.877*(R'- Y') R' = Y' + 1.140*V'

G' = Y' - 0.394*U' - 0.581*V' )

Is anyone can help me ? thanks

[Ying_H_Intel]

Hi Peter, 

Do you have problem to call the function or other exact issues? 

Yes, the function do the exact work as you list. You can see it in IPP manual. 

https://software.intel.com/en-us/ipp-9.0-ippi-manual-pdf

https://software.intel.com/en-us/articles/intel-integrated-performance-primitives-documentation/

There is sample: about  ippiYCbCr422ToGray

const int WIDTH = 2;
const int HEIGHT = 2;
Ipp8u pSrc[WIDTH * HEIGHT * 2] = {
190,70,191,80,
200,71,201,81,
};
Ipp8u pDst[WIDTH * HEIGHT];
int srcStep = WIDTH * 2, dstStep = WIDTH;
IppiSize roiSize = {WIDTH, HEIGHT};
IppStatus status = ippiYCbCr422ToGray_8u_C2C1R(pSrc, srcStep, pDst, dstStep, roiSize);
if ( status == ippStsNoErr) 
printf("PASS:\n%3d %3d\n%3d %3d\n", pDst[0], pDst[1], pDst[2], pDst[3]);
else 
printf("FAIL: status = %d\n", status);
 

You can change it to ippiYCbCr422ToBGR_8u_C2C3R

like  

Ipp8u pDst[3*WIDTH * HEIGHT];

dstStep = 3*WIDTH

ippiYCbCr422ToBGR_8u_C2C3R(pSrc,  srcStep,  pDst,
dstStep, roiSize)

Best Regards,

Ying H.

Intel IPP Support