OpenCV Q&A Forum - RSS feedhttp://answers.opencv.org/questions/OpenCV answersenCopyright <a href="http://www.opencv.org">OpenCV foundation</a>, 2012-2018.Mon, 11 Feb 2013 04:13:22 -0600Image quality Parameters in opencv ( noise + distortion )http://answers.opencv.org/question/7222/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?Mon, 11 Feb 2013 03:28:49 -0600http://answers.opencv.org/question/7222/image-quality-parameters-in-opencv-noise-distortion/Answer by sammy for <p>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.</p>
<p>1) How to calculate noise in an image?</p>
<p>2) What is geometric deformation and how to calculate geometric deformation of an image?</p>
<p>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?</p>
http://answers.opencv.org/question/7222/image-quality-parameters-in-opencv-noise-distortion/?answer=7225#post-id-7225Both 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.Mon, 11 Feb 2013 04:13:22 -0600http://answers.opencv.org/question/7222/image-quality-parameters-in-opencv-noise-distortion/?answer=7225#post-id-7225