motion blur parameters

hello, pls help me for finding motion blur parameters.i'm working on image forgeries detection based on motion blur ness.

[Image Analyst]

Let me try to understand. So, people try to create a forgery of an image by taking the original and blurring it, and now you want to take a blurred image, deblur it, and see if it's the same as one of your original images? Does that describe what's happening? I have a question first, though: why would any blur an image- wouldn't that ruin it? And why not use watermarking to secretly hide identifying information in your original image. Many watermarking methods are resistant to blurring, intensity or spatial scaling, noise, rotation, cropping, translation, etc.