Pseudo random sequence matrix from an image

Hello,

How to obtain pseudo random sequence matrix from a Y frame of image which is already converted to YCbCr?

Thanks

Answer 1

[Ameer Hamza]

As the documentation specifies, the Y matrix has values in the range [16 235]/255 for the floating-point datatype. You can do something like this

lims = [16 235]/255;
Y_new = rand(size(T))*diff(lims)+lims(1)

If your matrix is uint8, then use this

lims = [16 235]
Y_new = randi(lims, size(Y))

[marie lasz]

Y--luminance of an image. and what is 16?i have to encode 1024 bits in these pseudo rand values