How to divide an image into blocks(non overlapping) and access each block separately to calculate centroid for each block and get result as vector for each block

I need to divide image to separated blocks for example 5x5 blocks and then calculate centroid for each block and get result as vector for each block im new user so im confused and i want to know how to calculate centroid foe each block thank you

Answer 1

[Image Analyst]

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F

Or else see my attached demos. Use blockproc() if your blocks are non-overlapping and move in "jumps" of the block size. Use nlfilter() if the blocks move by just one pixel each time.

[Babatunde oladapo]

Hello Image analyst,

I am new to MATLAB. Kindly assist me on the question: How do I use the nlfilter to divide an image into 5x5 or 10 x10 blocks? further, how do I calculate the contrast of such block image(i.e 5x5 block image created). I would appreciate your reply on this question. Thank you in advance

[Image Analyst]

See my attached nlfilter demo and adapt as needed.

[Babatunde oladapo]

Thanks for replying to my questions. However, I still haven't gotten solutions to my questions.

If you could help, attached is the task I wanted answers to.

Thank you

[Image Analyst]

You should start your own question for this. In the meantime see the attached demo for how to mask a portion of the picture.