Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

adding color to grey scale video

Hello, I have a system that generates 8-bit grey scale video. The frame data is in ram, 8-bit grey scale 656 format. Depending upon the value of each pixel I want to be able to colorize the data. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

You will need to take your RGB value and convert it to YCbCr via a colour space converter, or just have a set of preset YCbCr values. Then you will need to convert it to 444 to 422 video for output (assuming you're using NTSC or PAL).

Colour space conversion is a matrix transform using the following matrix: 


(Y ) = (  0.299 ,  0.587 ,  0.114 , 0.0   ) (R)
(Cb)   ( -0.147 , -0.289 ,  0.436 , 128.0 ).(G)
(Cr)   (  0.615 , -0.515 , -0.1   , 128.0)) (B)
                                            (1)