Patent ID: 9686449
Date: 2017-06-20
CPC Classifications: G06T,H04N

Claim:
1. A method for determining blur in a video having at least one image, due to high quantization adopted during encoding of the image, the method comprising the steps of: preprocessing the image for filtering out the noise; extracting an edge image by extracting gradients of the preprocessed image; determining a grid periodicity and an offset in horizontal and vertical direction for the edge image; determining a blockiness metric based on the validation of a grid in the previous step; determining a ringing metric, based on, generating a gradient histogram by using the grid periodicity and the offset of the gradients that are off the grid; computing a mean and kurtosis of the gradient histogram; determining a perceptual blurriness metric based on the computed mean and kurtosis; and determining a composite blurring metric based on,