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Image quality Parameters in opencv ( noise + distortion )

I need to make an application in iphone which needs to calculate noise, geometric deformation other distortions in an image. How to do this? I have done some image processing stuff with opencv + iphone. But I dont know how to calculate these parameters.

1) How to calculate noise in an image?

2) What is geometric deformation and how to calculate geometric deformation of an image?

3) Is geometric deformation and distortion are same parameters in terms of image filter? or any other distortions available to calculate an image is good quality or not?