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Image quality Parameters in opencv ( noise + distortion )

asked 2013-02-11 03:28:49 -0500

UserOpenCV gravatar image

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?

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answered 2013-02-11 04:13:22 -0500

sammy gravatar image

Both noise and deformations are defined in relation to a model - the perfect picture. Of course, when you take a picture, there is no accompanying 'standard' to allow you to compare. So, NO, there is no way to define noise or distortions in an image.

However, this subject is a really interesting field, and many scientists and students tried to find ways to approximate the noise in an image. So far, there is no accepted or perfect way to do it, and the best you can is to google and read papers on the subject.

As for geometrical deformations, Wiki is your friend. There is plenty of info out there, no need to paste it here. Again, you will not find any way to miraculously measure it.

By the way, I do not understand why professors set this as homework - it's a very popular topic among students.

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Asked: 2013-02-11 03:28:49 -0500

Seen: 1,177 times

Last updated: Feb 11 '13