how to make a light color features to become bright?

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vidya 2013-12-16

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评论： vidya 2014-1-8

good day i have an image with extracted blood vessels and with no noise and a complete figure with all vessels in it..but some of my vessels are light in color..is there a way to make it dark.my image is..

expected output image is (this is image is a manualy drawn image form DRIVE data set

original vessels are

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Image Analyst 2013-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/109870-how-to-make-a-light-color-features-to-become-bright#answer_118488

在 MATLAB Online 中打开

grayImage(binaryImage) = 0; % Set white pixels to black.
grayImage(binaryImage) = 0.5 * grayImage(binaryImage); % Set white pixels to half intensity.

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Image Analyst 2013-12-24

I don't have any way of making the super faint vessels get detected, but I'm pretty sure it has been done before. If you go to section 20.5 here http://iris.usc.edu/Vision-Notes/bibliography/contentsmedical.html#Medical%20Applications,%20CAT,%20MRI,%20Ultrasound,%20Heart%20Models,%20Brain%20Models you will find lots of papers on that. There are plenty of spatial filters and ridge/valley detectors that could work, and I'm sure some of the papers have algorithm specialized for fundus images.

vidya 2014-1-8

Above u told me to use bwconvhull.. for d removal of cup..but i dont have .m file of bwconvhull...is there any other function that can substitute convhull

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