How would i extract ONLY even numbered elements of an image?

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Jenalyn Palacios 2020-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/509121-how-would-i-extract-only-even-numbered-elements-of-an-image

评论： Jenalyn Palacios 2020-3-5

I have an image that I am suppose to `Half' the size of the image (i.e.  reducing it to 256x256) by extracting only even numbered elements. This is my code so far:

% Part i.

imgroup0=imread('selfie2.tif');

A1= rgb2gray(imgroup0);

imgroup1=imresize(A1, [512 512]);

% Part ii.

evens=imgroup1(mod(imgroup1,2)==0);

But i dont understand how mod will help me 'extract' the even numbers from the image or how i would display it afterwards. Can someone explain?

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Answer 1

Bhaskar R 2020-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/509121-how-would-i-extract-only-even-numbered-elements-of-an-image#answer_418601

编辑：Bhaskar R 2020-3-5

在 MATLAB Online 中打开

Part ii

% for even values
even_values = imgroup1(mod(imgroup1, 2) == 0);
% for display purpose
evens = imgroup1.*uint8(mod(imgroup1, 2) == 0);
figure, imshow(evens);  