Patent ID: 7031552

Claim:
A method for reducing ringing noise in a decompressed image, comprising the steps of: obtaining reconstructed frame blocks of the decompressed image; for each reconstructed frame block, selectively performing a first type of filtering on each pixel of that reconstructed frame block based on certain relationships between that pixel and its left and right adjacent pixels, wherein, for each pixel of that block, a first filter is applied to perform the first type of filtering if a first condition is satisfied, a second filter is applied to perform the first type of filtering if the first condition is not satisfied but a second condition is satisfied; and for each reconstructed frame block, selectively performing a second type of filtering on each pixel of that reconstructed frame block based on certain relationships between that pixel and its upper and lower adjacent pixels, wherein, for each pixel of that block, the first filter is applied to perform the second type of filtering if a third condition is satisfied, the second filter is applied to perform the second type of filtering if the third condition is not satisfied but a fourth condition is satisfied.