Reducing blocking effects in block transfer encoders

Details Reducing blocking effects in block transfer encoders Reducing blocking effects in block transfer encoders

1995-05-12

1997-03-04

Ramirez, Ellis B.

Boots, shoes, and leggings

G06F 1700

Patent

active

056086520

ABSTRACT:
A computer-implemented method and apparatus for encoding video signals, wherein the encoding is defined by a plurality of encoding parameters. According to a preferred embodiment, an initial quantization level is determined for quantizing a block of signals representative of a block of pixels of a picture, wherein the initial quantization level is an encoding parameter of the plurality of encoding parameters. At least one encoding parameter of the plurality of encoding parameters is modified before encoding the block of signals to provide a modified plurality of encoding parameters such that block edge artifacts between the block of pixels and at least one adjacent block of pixels that arise after decoding encoded signals are reduced. In an alternative preferred method and apparatus for encoding a block of signals representative of a block of pixels of a picture, wherein the encoding is defined by a plurality of encoding parameters including a quantization level selected from a plurality of possible quantization levels, an encoding error is determined for the block of pixels such that the encoding error for the block of pixels tends to be larger for encoding parameters that cause a block edge artifact between the block of pixels and at least one adjacent block of pixels. A plurality of encoding parameters is selected in accordance with the encoding error.

REFERENCES:
patent: 5426673 (1995-06-01), Mitra et al.
patent: 5506621 (1996-04-01), Ogasawara et al.

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