How to divide an image in two blocks

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Jack Sparrow 2013-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/61485-how-to-divide-an-image-in-two-blocks

评论： Image Analyst 2019-4-26

采纳的回答： Azzi Abdelmalek

How can I divide an image into two halves? Then, after dividing it make each half independent, say

A = top half and

B = the bottom half.

So that I can extract features from each half.

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Nourou 2014-8-8

编辑：Image Analyst 2014-8-8

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Hi Jack, Azzi,

Please I need a clarification about the usage of the following method:

im=imread('yourimage')
n=fix(size(im,1)/2)
A=im(1:n,:,:);
B=im(n+1:end,:,:)
imshow(A)
figure
imshow(B)

I try to use it on a grayscale image, but the results are 2 blank images. Please how can I edit your code to make it divide my image. I know you use it with a rgb image.

Thank you!

Image Analyst 2014-8-8

编辑：Image Analyst 2014-8-8

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A and B are probably double for some reason. Try

imshow(A, []);
imshow(B, []);

Start your own question if you need more help.

And there is a FAQ for the original poster's question: http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F

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采纳的回答

Azzi Abdelmalek 2013-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/61485-how-to-divide-an-image-in-two-blocks#answer_73534

在 MATLAB Online 中打开

im=imread('yourimage')
n=fix(size(im,1)/2)
A=im(1:n,:,:);
B=im(n+1:end,:,:)
imshow(A)
figure
imshow(B)

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zohreh nezami 2017-6-22

thank you

suma g 2018-4-2

sir u have given for left half and right half of the image... very helpful.i want to segment the face image into upper and bottom half of the face ... upper- forehead,eyes and eyebrows & lower- nose lips and chin CAN U GIVE ME SOME IDEA

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utkarsh kumar 2019-4-26

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hi i am having a doubt in understanding the code.....in the below code

im=imread('yourimage')

n=fix(size(im,1)/2)

A=im(1:n,:,:);

B=im(n+1:end,:,:)

imshow(A)

figure

imshow(B)

What is the meaning of the highlighted one .

Thanks

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Image Analyst 2019-4-26

It says A is equal to rows 1 through n, all columns, all color rows. The colon means "all" if it's by itself, or "to" if it's in an expressions like 1:n.

So if n is the middle row, A will be the top half. Then B picks up from one row below the middle row. It says B equals all rows from one row below the middle row to the last row, and all columns and all color channels. If it's grayscale, having an extra : in there for the third index will not hurt - it will just ignore it.

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