How to quantify the image quality from the given image samples

2013 7 26
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Dear MATLAB users,
I have three image samples derived from an original RGB image.
1) Image 1 = R / (R+G+B) <http://i335.photobucket.com/albums/m466/blakeex/Picture2.png>
2) Image 2 = G / (R+G+B) <http://i335.photobucket.com/albums/m466/blakeex/Picture3.png>
3) Image 3 = B / (R+G+B) <http://i335.photobucket.com/albums/m466/blakeex/Picture4.png>
How can I quantify the image quality from three images? What are the formulas or built-in MATLAB functions to calculate the SNR and contrast of those images?
Thank you.

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Eric
Eric
2013-7-26

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