How to calculate Multi Block DCT of an image where block size are 2x2; 4x4 and 8x8? Thanks

Hi, I am trying to calculate MBDCT of a 2D gray image where block size is 2x2 or 4x4 or 8x8. I have used dct2 function before. But as far I understand, dct2 function calculates the entire image matrix. So can you please tell me how to code this? Thanks a lot for your kind guidance.

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/images/ref/dct2.html

[Mohammad Manzurul Islam]

As i said, I need to apply dct on blocks of image. For example, the blocks may be 2x2 or 4x4 or any other block size. And image can be of any size.