topic Converting from pixel-order (C3) to planar (P3) data ? in Intel® Integrated Performance Primitives

Converting from pixel-order (C3) to planar (P3) data ?

gari154 — Wed, 24 Aug 2005 09:28:44 GMT

Hi all,

I have a little problem to convert image color from pixel-order RGB to planar data YCbCr. Anybody know how to do that ? I need your suggestions.

Thanks,

Gunawan

Re: Converting from pixel-order (C3) to planar (P3) data ?

Vladimir_Dudnik — Wed, 24 Aug 2005 18:10:00 GMT

Hi Gunawan

You can check Intel Integrated Performance Primitives for Intel Architecture Reference Manual, Volume 2: Image and Video Processing

to find any particular functions in Image Processing domain. For example, convertion like you mention can be done with using the following functions (described in ippi.h file)

Code:

/* Pixel to Plane */
IPPAPI(IppStatus, ippiRGBToYUV_8u_C3P3R,( const Ipp8u* pSrc, int srcStep ,
       Ipp8u* pDst[3], int dstStep, IppiSize roiSize))
/* Plane to Pixel */
IPPAPI(IppStatus, ippiYUVToRGB_8u_P3C3R,(const Ipp8u* const pSrc[3], int srcStep,
       Ipp8u* pDst, int dstStep, IppiSize roiSize))

Regards,

Vladimir

Re: Converting from pixel-order (C3) to planar (P3) data ?

gari154 — Thu, 25 Aug 2005 11:32:18 GMT

Hi Vladimir,

Thanks for your suggestion. However I think YUV and YCbCr are different( based on the convertion formula on IPP reference manual ). I found "C3P3R" on RGBToYUV but not on RGBToYCbCr.

Thanks,
Gunawan

Re: Converting from pixel-order (C3) to planar (P3) data ?

Vladimir_Dudnik — Thu, 25 Aug 2005 22:49:32 GMT

You are right, there might be difference between YUV and YCbCr (depends how you define these color spaces). The exact formulae used in this functions are described in IPP documentation. By the way, we also have ippiRGBToYCbCr_JPEG_8u_C3P3R function in ippJP library (see ippj.h file)

Regards,

Vladimir