how to measure the contrast ratio of input and enhanced image?

i,m trying to calculate the contrast ratio as a parameter for quality check for an image,can some tell me how to calculate the contrast ratio?

[David Barry]

Example image? What have you tried so far?

Answer 1

[Image Analyst]

How are you measuring it? Why not search the File Exchange for contrast: https://www.mathworks.com/matlabcentral/fileexchange/?utf8=%E2%9C%93&term=contrast

or check some of the links on the right side of this page?

Answer 2

[r r]

I have a image that contains a tumor and I want to calculate the contrast ratio for this tumor. Is this method correct? Thank you

I found this example but I don't need you.

https://www.mathworks.com/matlabcentral/fileexchange/46257-digital-mammography-image-enhancement-using-improved

I want to calculate the contrast ratio for the tumor region and the background