Patent · US Active

Pixel block processing

US8335385B2 · kind B2 · utility

7Cited by

1References

26Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Jacob Ström · Stockholm, SE
Tomas G. Akenine-Moller · Lund, SE
Per Wennersten · Kramfors, SE

Key dates

Filing date	Sep 17, 2008
Grant date	Dec 18, 2012
Priority date	—
Expiry date	Mar 27, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/176
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A pixel block (300) is losslessly compressed into a candidate compressed block. If the bit length of the candidate block exceeds a threshold value, the property values of the pixels (310-317) in the block (300) are quantized and the quantized values are losslessly compressed into a new candidate compressed block. The procedure is repeated until a candidate compressed block having good image quality and a bit length below the threshold value is found. A compressed representation (400) of the block (300) is determined based on the found candidate compressed block (420) and an identifier (410) of the used quantization parameter.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.