Image analysis for Signal processing help

Hello,

I have an image

How can I select a region of this image to crop out a 10x10 region of pixels and then display this on a figure window?

After this how can I perform a Discrete Cosine Transform (2D DCT) on it

and obtain the DCT coefficient values?

Thank you

Answer 1

[Sulaymon Eshkabilov]

Use imcrop()

How to use this function: >> doc imcrop

Answer 2

[Sulaymon Eshkabilov]

Using the Discrete Cosine Transform is quite straightforward. You'd need to employ dctmtx() fcn.

Help documentation:

doc dctmtx

Also, you can view this online documentation:

mathworks.com/help/images/discrete-cosine-transform.html