Post-processing method and apparatus for use in a video signal d

Details Post-processing method and apparatus for use in a video signal d Post-processing method and apparatus for use in a video signal d

1996-02-01

1998-12-22

Moore, David K.

Image analysis

Image enhancement or restoration

Edge or contour enhancement

348420, 382233, G06K 936, G06K 940, H04N 712

Patent

active

058526820

ABSTRACT:
A method for post-processing a current block is used in a decoding system for decoding an encoded digital image signal. The encoded digital image signal includes a plurality of encoded blocks of quantized transform coefficients, and the current block corresponds to one of the encoded blocks having a quantized DC coefficient and a predetermined number of quantized AC coefficients, the quantized DC coefficient having been quantized based on a DC quantization step size. The method comprises the steps of:
(a) calculating an average neighboring pixel value(ANV) of neighboring block pixels located along a borderline between the current block and its neighboring blocks; (b) obtaining an average current pixel value(ACV) of current block pixels located along the borderline between the current block and the neighboring blocks; and (c) adjusting pixel values of the current block pixels based on the average neighboring pixel value, the average current pixel value, and the DC quantization step size.

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