lookup into array given a matrix (just replacing the values of matrix by vector)

Hi everyone,

I have a very big matrix R of uint8. For every element (0-255) I have an other value in array A, where A is 256 length vector.

Now How can I replace each element in R by their lookup value in A. I want to do it as fast as it can.

Answer 1

[Image Analyst]

The function you want to use is called intlut() and it's in the Image Processing Toolbox. It's fast and is just a single line of code.

new_R = intlut(R, A);

[Aravin]

Thanks, it is what I exactly want.

Can we have A as matrix instead an Array.