Conversion of Medical image to Blue Ration

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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?

Accepted Answer

Dishant Arora
Dishant Arora on 6 Apr 2014
use:
imshow(BR , [])
Or
imagesc(BR)
  3 Comments
Dishant Arora
Dishant Arora on 7 Apr 2014
Use your image as it is for further processing or cast it to double using im2double as Image Analyst said.

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More Answers (1)

Image Analyst
Image Analyst on 6 Apr 2014
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.

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