I'm new to MATLAB and I want to consider a 4x4 pixel block with it's intensities from a whole picture which is a grey scale image. How do I do it?

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Vaibav Reddy 2022-7-26

评论： Vaibav Reddy 2022-7-26

a = imread('Spiderman.png');

y = rgb2gray(a);

for i = 186:1:189

for j = 165:1:168

pixel_values = y(i,j);

end

I wrote this code. I think I made a mistake because it's not working. I hope you can help me with it. Thank you.

David Hill 2022-7-26

a = imread('Spiderman.png');
y = rgb2gray(a);
pixel_values=y(186:189,165:168);

Vaibav Reddy 2022-7-26

Thanks a lot Mr.Hill. And I used the 'disp' command to display the intensity values on my command window.

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