Conversion of Medical image to Blue Ration

Question

Tahir 2014-4-6

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124723-conversion-of-medical-image-to-blue-ration

评论： Dishant Arora 2014-4-7

采纳的回答： Dishant Arora

在 MATLAB Online 中打开

Respected Members! My task is to convert RGB image to Blue ratio image.

This is the formula of conversion:

and code is

% RGB to Blue Ratio Conversion %--------------------------------------
R= img(:,:,1);
G=img(:,:,2);
B=img(:,:,3);
BR=((100 * B)./(1+R+G)) .* (256./(1+B+R+G)); % formula for conversion
imshow(BR);

The expected output can be seen in this image after running the code.

But when I apply the code...the output is a black image -- there is no sign of anything in image. Here is the input image:

Kindly help. How I can fix this issue so that I can see the contents of image?

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Answer 1

Dishant Arora 2014-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/124723-conversion-of-medical-image-to-blue-ration#answer_132463

在 MATLAB Online 中打开

use:

imshow(BR , [])

Or

imagesc(BR)

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Tahir 2014-4-6

编辑：Image Analyst 2014-4-6

I have to use this image for further processing ...what can i do next..the output is 100% correct...but for further processing what i do.

imshow(BR , []);

i have to apply filter on this image.reply plz

[EDIT]

The issue is solved after obeying the instruction from him..Good job sir.

Dishant Arora 2014-4-7

Use your image as it is for further processing or cast it to double using im2double as Image Analyst said.

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Answer 2

Image Analyst 2014-4-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124723-conversion-of-medical-image-to-blue-ration#answer_132473

You need to cast to double because (B+R+G) will get clipped at 255 if you dont and just leave them as uint8!!! Then display with [] option in imshow like Dishant showed you.