topic Re: YUV422ToRGB or YUV420ToRGB in Intel® Integrated Performance Primitives

YUV422ToRGB or YUV420ToRGB

jaimevalenzuela — Mon, 17 Jan 2005 23:46:11 GMT

Hi,

What kind of interpolation is used in the half size UV planes to convert from YUV422 to RGB? What is the process in this function, YUV422 to YUV444 and finally to RGB?

Thanks

Re: YUV422ToRGB or YUV420ToRGB

Vladimir_Dudnik — Wed, 19 Jan 2005 03:01:46 GMT

Hi,

For convertions like YUV422 To RGB or YUV422 To YUV444 we dont use interpolation at all.

The Catmull-Rom interpolation is used in function ippiYCbCr420ToYCbCr422Filter_8u_P2P3R

Regards,

Vladimir

Re: YUV422ToRGB or YUV420ToRGB

foreststone — Wed, 19 Jan 2005 10:22:03 GMT

It is difficult to understand to convert yuv420 or yuv422 to yuv444 without interpolation . Just like resizing image from small size to large
size , we must use interpolation .

Re: YUV422ToRGB or YUV420ToRGB

jaimevalenzuela — Wed, 19 Jan 2005 14:32:05 GMT

Perhaps I should rephrase the question.

A straightconversion from YUV to RGB only involves a colortwist operationwith equal size planes andwe end up with an RGB image that has 3 planes of equal size.

When converting from YUV 422 or YUV 420 to RGB we start with a U and V planes of half or a fourth the size of the Y plane.How are the extra pixels made up when converting from YUV422 or YUV420 To RGB?