Take the average from a region of a plot and subtract the background

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aneps
aneps 2013-11-25
评论： Image Analyst 2013-11-25
I have a histogram ranging from 0 to 700 (along X axis). It is an exponential decay curve. I want to take the average from 600 to 700. This average is the background. I want to subtract this background from the plot. How can I perform this in Matlab?

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Image Analyst
Image Analyst 2013-11-25
Try this:
binaryImage = grayImage > 600;
meanGL = mean(grayImage(binaryImage ))
newImage = double(grayImage) - meanGL; % Casting to double is needed to get negative values.
imshow(newImage, []); % The [] is needed.
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aneps
aneps 2013-11-25
Yes, I know indexing a little bit. This meanBinIndex gives the mean in the range 620 to 720 right? If so, I guess, this value can be used as the background.
Image Analyst
Image Analyst 2013-11-25
It should give you the mean t in the histogram. Because your t starts at 0, you can find the index, if you need it, by adding 1. If you need just the t value, you don't need to add 1.

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