To find the entropy, you just need to apply the definition:
H = -0.25 * log2(0.25) - 0.75 * log2(0.75)
Since we are using log2
, the result will be in bits.
As for generating a Matlab B&W (i.e. binary) image of size 512x512, you can simply do:
im = rand(512) < 0.75;
By convention, true
= 1 = white and false
= 0 = black.