How can I make a Loop (!) over the image using a 5×5 pixel window

Loop (!) over the image using a 5×5 pixel window. For each such window, compute the average pixel value and store the result in a new image. Treat borders in some controlled way and make sure the result has the same size in pixels as the original image. You will need at least two nested for-loops, to scan rows and columns in your image.

[Walter Roberson]

Overlapping windows, or non-overlapping windows?

Look at blockproc()

[KALYAN ACHARJYA]

There is no need of loops, is it must be use?

[Nadeen Bahnam]

Is there some other way to solve this if loops are not be used ?

[Walter Roberson]

nlfilt(), blockproc(), conv2()

Answer 1

[Mahesh Taparia]

Hi Nadeen,

It seems you want to do average filtering of an image with the kernal size of 5x5. It can be done using imfilter command. Consider the code below:

window_size = 5; 
filter_type=fspecial('average', window_size); 
filtered_image = imfilter(I,filter_type, 'replicate'); %%%  I = image

For more details refer to the documentation page of imfilter using the link given below:

https://www.mathworks.com/help/images/ref/imfilter.html

[Nadeen Bahnam]

ok thank you