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how do i divide an image into blocks?

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Rey Kelvin Peralta
Rey Kelvin Peralta on 16 Aug 2015
Commented: Rena Berman on 24 Jan 2017
I have this image (2848 x 4288) and i want to divide it into 9 blocks and perform some operations on individual or each block. For example i perform this operations on an image:;
y = rgb2gray(imresize(imread('DSC_0009.jpg'),.2));
z = 255.0 - 1.0 * double(y);
z = z ./5 ;
z2 = imfilter(z, fspecial('average', 15));
z2(z2 > 35) = 35;
z2(z2 < 30) = 0;
surface(z2);
shading interp;
axis ij;
axis tight;
I want to do a similar operation on each of the blocks and output it as well.
thank you.

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Rena Berman
Rena Berman on 24 Jan 2017
(Answers dev) Restored question.

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Answers (2)

Image Analyst
Image Analyst on 16 Aug 2015
See the FAQ for code to perform it two different ways, normal indexing, and the cell2mat() function: http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F

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Image Analyst
Image Analyst on 16 Aug 2015
You can also use blockproc() if you don't need to store the subimages but just need to perform some operation on them and give you an output image. See attached demos for a variety of ways to use blockproc().

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Rey Kelvin Peralta
Rey Kelvin Peralta on 18 Aug 2015
Also sir, is there a way we can export my code or the figure/surface/3dsurface of this code in to a format into which blender can read it? please help
Image Analyst
Image Analyst on 19 Aug 2015
I don't know. I've never used blender. However using fwrite() or fprintf() you can create any file you want.

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