To identify the pixels with the highest intensity (index) value in a figure.

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U B 2021-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/1611395-to-identify-the-pixels-with-the-highest-intensity-index-value-in-a-figure

评论： U B 2021-12-15

I want to identify the value/values which has the highest intensity value in a figure . To read an image, im using the below code.

a = imread('Fig.png');
a1 = sum(a,3);
figure, t=imagesc(a1),axis square; 

Using a data tip, I can see the value of index and corresponding (X,Y). I want those pixels to be identified on that figure itself. How do I do that?

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Answer 1

Image Analyst 2021-12-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1611395-to-identify-the-pixels-with-the-highest-intensity-index-value-in-a-figure#answer_855780

在 MATLAB Online 中打开

Try this:

a = imread('Fig.png');
a1 = sum(a, 3);
imshow(a1, []);
axis('on', 'image'); 
impixelinfo; % Show RGB values in status line at bottom left.
% Find max value
maxValue = max(a1(:))
% Find where it occurs and put red crosshairs there in the overlay.
[rows, columns] = find(a1 == maxValue);
for k = 1 : length(rows)
    hold on;
    plot(columns(k), rows(k), 'r+', 'MarkerSize', 50, 'LineWidth', 2);
end
hold off;