How to get the bright areas separately from an image?
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Hi there,
I have a combustion image in gray scale (Sample), with this I would like to extract the bright areas separately (Sample02).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/526219/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/526224/image.jpeg)
However, the areas are connected with other areas (merge together), I could not extract them out from the whole area after binarizing the image.
PS: the bright areas are resulted from auto-ignition and the corresponding area and intensity go up very fast, so I want to extract them for analysis.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/526229/image.jpeg)
Any possible solution will be highly appreciated, thanks a lot!
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Image Analyst
2021년 2월 21일
Can you divide the later image by an earlier one? The ratio in the regions where the intensity went up faster than the rest of the image will have a ratio bigger than the rest of the image. Then you can threshold and call regionprops().
ratioImage = double(image2) ./ double(image1);
mask = ratioImage > someValue;
props = regionprops(mask, image2, 'Area', 'MeanIntensity')
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