Patent · US Active

Image processing

US8577164B2 · kind B2 · utility

7Cited by

10References

20Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Jacob Ström · Stockholm, SE
Per Wennersten · Kramfors, SE

Key dates

Filing date	May 29, 2009
Grant date	Nov 5, 2013
Priority date	—
Expiry date	Mar 16, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/192
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An image (1) is decomposed into multiple superblocks (20, 22), each encompassing multiple pixel blocks (30A-30D, 32A-32D) having multiple pixels (40). The property values of a superblock (20) is fixed rate compressed to get a compressed block having a target bit length. The compressed block is stored in the memory locations (310, 320) assigned to the multiple pixel blocks (30A-30D) encompassed by the superblock (20) to thereby get multiple copies of the compressed block in the memory (300). The multiple copies collectively constitute a compressed representation of the superblock (20). When accessing a compressed block in a memory location (310) using random access during decoding, property values for neighboring pixel blocks (30B-30D) are obtained for free without the need for any further memory access.

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