5- Calculate the entropy H of several grayscale images, including the uniform random image generated above. Entropy is defined as

where M is the number of gray levels and pk is the probability associated with gray level k. Note that a base-2 logarithm is used conventionally. See the file entropy.m. Read p 532533 of the textbook.

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function h = entropy(x) % % Entropy of an image % counts = imhist(x); counts = counts / sum(counts); i = find(counts); h = -sum(counts(i).*log2(counts(i)));