Patent ID: 6529638
Filing Date: 2003-03-04
Classification: H04N

Abstract:
A method of reducing an artifact at a block boundary in a decompressed digital 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) computing the mean of an intensity said interpolation pixels; (d) computing an intensity difference between said mean intensity and said intensity of each of said interpolation pixels; and (e) quantizing said intensity differences; (f) constructing an intensity distribution index from said quantized intensity differentials; (d) selecting a plurality of filter coefficients correlated to said intensity distribution index; (e) modifying said intensity of said subject pixel by applying a filter producing said modified intensity as a function of said filter coefficients.