Patent ID: 6807317
Filing Date: 2004-10-19
Classification: G06T,H04N

Abstract:
A method for reducing quantization effects of a decoded image, the method comprising the steps of:receiving at least part of a decoded image comprising decode blocks that were decoded from transform coded blocks quantized by a selected quantization parameter; analyzing selected pixel values of selected pixels with neighboring pixel values of associated neighboring pixels in said decoded blocks to determine difference values for each of said selected pixels; detecting potential object edges, of the decoded image represented by the decoded blocks, to identify said selected pixels as edge pixels, said detecting being effected by comparing said difference values with selected threshold values that are determined with respect to said selected quantization parameter associated with a selected one of said blocks, said selected threshold values having a non-linear relationship with varying quantization parameter values of said image; and modifying said selected pixel values of said selected pixels that are identified as not being edge pixels.