What is the benefit of casting image into double after reading in Matlab

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Tahir
Tahir 2015-2-16
评论： Image Analyst 2015-2-16
Hello, I asked several questions here.in every answer it is recommended that caste the image to double.
So i want to know what is the benefit of casting image to double. My segmentation results are not good.so i am thinking on every factor. plz help.Thank you

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Image Analyst
Image Analyst 2015-2-16
It's not necessarily true that you should cast to double. It depends on the circumstances and what you're trying to do or measure. I don't think it should make the segmentation worse though.
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Tahir
Tahir 2015-2-16
Ok sir i want to know that this function input should be in double or unit8.This is my first operation on my medical image image. The image is also attached here.
function img_BlueRation = Fun_BlueRationConv(img)
R = img(:,:,1);
G = img(:,:,2);
B = img(:,:,3);
img_BlueRation = ((100 * B)./(1+R+G)) .* (256./(1+B+R+G));
end
Kindly sir also tell me what is clipping in this sense.
Image Analyst
Image Analyst 2015-2-16
Just make a little experiment to see. Look at this code and see the two different results:
R = uint8(9);
G = uint8(19);
B = uint8(139);
img_BlueRation = ((100 * B)./(1+R+G)) .* (256./(1+B+R+G))
whos img_BlueRation
R = double(9);
G = double(19);
B = double(139);
img_BlueRation = ((100 * B)./(1+R+G)) .* (256./(1+B+R+G))
whos img_BlueRation
img_BlueRation =
18
Name Size Bytes Class Attributes
img_BlueRation 1x1 1 uint8
img_BlueRation =
730.377668308703
Name Size Bytes Class Attributes
img_BlueRation 1x1 8 double
So it seems to me you should case img to double before you do that kind of math on it.

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