Dividing an image into N block in the width and calculating the edge points of each block

Hello everyone I was trying to divide an image into N different blocks in the width after I performed this code to get its edge points:

Ioriginal = imread('sample.jpg') %read the image
Igray = rgb2gray(Ioriginal) %change it to gray scale
InoNoise = wiener2(Igray)  %remove noise from image
image = edge(InoNoise, 'prewitt') %get the edge points of the image

the result is shown in this picture

Now what i want to do is dividing the image into N equal blocks and calculate the edge points of each block

I really appreciate if someone can really help me doing this part

Thank you

Answer 1

[Image Analyst]

Two ways are shown in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F