How to get the bright areas separately from an image?

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Hao Shi
Hao Shi el 20 de Feb. de 2021
Comentada: Hao Shi el 25 de Feb. de 2021
Hi there,
I have a combustion image in gray scale (Sample), with this I would like to extract the bright areas separately (Sample02).
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.
Any possible solution will be highly appreciated, thanks a lot!

Respuesta aceptada

Image Analyst
Image Analyst el 21 de Feb. de 2021
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')
  1 comentario
Hao Shi
Hao Shi el 25 de Feb. de 2021
Dear Analyst,
Thank you so much for your kind suggestion, it works!!
I tried this method before, there were some noises along the flame boundary, where the intensities also change significantly when the flame propagates. Later I used the filter to filter out the noises, and it looks ok. Thanks a lot!
Before filtering:
After filtering:

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