Random Walk Image Processing

Hi pls help me..How to do random walk in RGB image to store the local lightness pixel values?.

[Image Analyst]

Not sure what you mean. Do you just want to start a random path of N steps and collect all the RGB values in an N-by-3 matrix? If so, ok, easy enough. But why do you want to do this? I don't see the use of it.

[Priya Sri]

I am trying to enhance an image using random walk. I want to find similar texture in the neighbourhood of the RGB image through random walk. Thank you