how to reach amount of entropy of image in between the range [0,1] ?

Hi, Usually the amount of entropy is between the range [0,1]. but after run

     E = entropy(I)

E is a scalar value representing the entropy of grayscale image I that E>1.i want E between [0,1]. please guide me or suggest an another function.

Answer 1

[Thorsten]

You can scale the output by the maximum entropy for this image

 H = entropy(I);
 N = numel(I);
 maxH = entropy([1:N]/N);
 Hscaled = H/maxH;

[fred bnm]

ok.very thanks.what is difference between the class of input image for this problem.for example double or unint8.

[Thorsten]

If it's double, the values have to be in the range [0,1], and if its unit8, the values have to be in the range [0, 255], as far as I understood.

[fred bnm]

N is number of element in matrix.i cant understand the maxH.please explain more.