Patent ID: 7076114

Claim:
A method of reducing an artifact at a block boundary in a decompressed image comprising the steps of: (a) identifying a plurality of interpolation pixels including at least one pixel on each of a first side and a second side of said block boundary; (b) identifying one said interpolation pixel on said first side of said block boundary as a subject pixel; (c) determining a distribution of a scalar characteristic of said interpolation pixels, wherein said scalar characteristic is a non-quantized characteristic; (d) selecting a plurality of filter coefficients correlated to a quantization of said distribution of said scalar characteristic; (e) modifying an intensity of said subject pixel by applying a filter producing said modified intensity of said subject pixel as a function of said filter coefficients; and (f) selecting a second plurality of filter coefficients correlated to a distribution of said scalar characteristic of said first pixel, said subject pixel, a second pixel on said second side of said block boundary and adjoining said subject pixel, and a third pixel adjoining a side of said first pixel remote from said block boundary; and (g) modifying an intensity of a first pixel by applying a filter producing said modified intensity of said first pixel as a function of said second plurality of filter coefficients.