Patent · US Active

Image coding apparatus and image decoding apparatus

US8189934B2 · kind B2 · utility

9Cited by

4References

11Claims

0Family size

Assignee

PANASONIC HOLDINGS CORPORATION · JP

Inventors

Steffen Wittmann · Klipphausen, DE
Thomas Wedi · Groß-Umstadt, DE

Key dates

Filing date	Mar 26, 2007
Grant date	May 29, 2012
Priority date	—
Expiry date	Aug 22, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/86
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Provide is an image decoding apparatus which reliably prevents deterioration of the image quality of decoded images which have been previously coded. An image decoding apparatus (200) includes: an inverse quantization and inverse orthogonal transform unit (220) and an adder (230) which decode a coded image included in a coded stream (Str) to generate a decoded image (Rc); an entropy decoding unit (210) which extracts cross-correlation data (p) which indicates a cross-correlation between the decoded image (Rc) and an image which corresponds to the decoded image and has not yet been coded; and an adaptive filter (240) which computes a filter parameter (w) based on the extracted cross-correlation data (p), and performs a filtering operation on the decoded image (Rc) according to the filter parameter (w).

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