how can i plot a histogram of pixel values?

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sanaz 2014-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/142661-how-can-i-plot-a-histogram-of-pixel-values

评论： sanaz 2014-7-21

1.JPG

i'm working on a simulation and it contains a histogram of pixel differences for original image and marked one. but i do not understand this plot (that comes in attachment). can anybody please review it and guide me on that?

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Wayne King 2014-7-20

Did you attach anything?

sanaz 2014-7-20

i had but seems like it was not attached, i did again, can you see it now?

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Image Analyst 2014-7-20

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编辑：Image Analyst 2014-7-20

在 MATLAB Online 中打开

Your plot shows that there is a pixel-to-pixel difference (same location) of anywhere from -4 to +0.5 gray levels.

diffImage = double(image1) - double(image2);
minValue = min(diffImage(:));
maxValue = max(diffImage(:));
edges = linspace(minValue, maxValue, 500); % 500 bins
counts = histc(diffImage(:));
plot(edges, counts, 'b-');
grid on;