How to calculate and plot the histogram of DCT coefficients of an image?

How to calculate and plot the histogram of DCT coefficients of an image?

Answer 1

[Walter Roberson]

Calculate the coefficients with dct(). Call histogram() with them.

[Mohsin Shah]

can you explain it with an example?

[Walter Roberson]

Img = imread('cameraman.tif');
y = dct(double(Img));
histogram(y)