Patent ID: 7099518

Claim:
A method of estimating blurring due to video processing in a test video sequence comprising the steps of: detecting blocks within each frame of the test video sequence that have a valid image edge by filtering each frame of the test video sequence to produce a filtered output having either a zero or a one at each pixel location within each frame with the ones identifying an edge; and identifying the blocks within each frame that have the valid image edge as a function of the filtered output and a block size value by counting a number of transitions from zero to one around the perimeter of each block, and determining as a function of the number for each block whether the block has a valid edge; selecting an edge point centrally located within each detected block as a function of an edge enhanced version of the test video sequence without video processing induced block boundary edges; and estimating a blurring value for the test video sequence as a function of normals to the valid image edges at the edge points.