How to deal with RGB to YUV conversion

Question

The formula says:

Y = 0.299 * R + 0.587 * G + 0.114 * B;  U = -0.14713 * R - 0.28886 * G + 0.436 * B;  V = 0.615 * R - 0.51499 * G - 0.10001 * B; 

What if, for example, the U variable becomes negative?

U = -0.14713 * R - 0.28886 * G + 0.436 * B; 

Assume maximum values for R and G (ones) and B = 0 So, I am interested in implementing this convetion function in OpenCV, So, how to deal with negative values? Using float image? anyway please explain me, may be I don't understand something..

Answer 1

You can convert RGB<->YUV in OpenCV with cvtColor using the code CV_YCrCb2RGB for YUV->RGB and CV_RGBYCrCb for RGB->YUV.

void cvCvtColor(const CvArr* src, CvArr* dst, int code) 

Converts an image from one color space to another.

Answer 2

Y, U and V are all allowed to be negative when represented by decimals, according to the YUV color plane.

Answer 3

for planar formats OpenCV is not the right tool for the job. Instead you are better off using ffmpeg. for example

static void rgbToYuv(byte* src, byte* dst, int width,int height) {      byte* src_planes[3] = {src,src + width*height, src+ (width*height*3/2)};     int src_stride[3] = {width, width / 2, width / 2};     byte* dest_planes[3] = {dst,NULL,NULL};     int dest_stride[3] = {width*4,0,0};     struct SwsContext *img_convert_ctx = sws_getContext(         width,height,         PIX_FMT_YUV420P,width,height,PIX_FMT_RGB32,SWS_POINT,NULL,NULL,NULL);         sws_scale(img_convert_ctx, src_planes,src_stride,0,height,dest_planes,dest_stride);      sws_freeContext(img_convert_ctx); } 

will convert a YUV420 image to RGB32