MATLAB: Extracting pixels from an image random

Question

Hello,

How can I extract 100 pixels color randomly from an image ?

Answer 1

One way:

row = randi(size(yourimage, 1), 100, 1);  %select 100 row coordinates at random
col = randi(size(yourimage, 1), 100, 1);  %and 100 columns to go with it
rgb = yourimage(sub2ind(size(yourimage), repmat(row, 1, 3), repmat(col, 1, 3), repmat(1:3, 100, 1)));  
%for pretty display
table(row, col, rgb)