Patent · US Active

Image debanding using adaptive sparse filtering

US11663702B2 · kind B2 · utility

0Cited by

11References

20Claims

0Family size

Assignee

Dolby Laboratories Licensing Corporation · US

Inventors

Neeraj J. Gadgil · Sunnyvale, US
Qing Song · Charleston, US
Guan-Ming Su · Fremont, US

Key dates

Filing date	Dec 10, 2019
Grant date	May 30, 2023
Priority date	—
Expiry date	May 10, 2040

Classification

Technology area (CPC G)Physics
CPC primaryG06T2207/20012
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Methods and systems for reducing banding artifacts when displaying images are described. Identified image bands are filtered using an adaptive sparse finite response filter, where the tap-distance in the sparse filter is adapted according to an estimated width of each image band. Image debanding may be performed across multiple pixel orientations, such as rows, columns, a 45-degree angle, or a −45-degree angle. Given a threshold to decide whether sparse filtering needs to be performed or not, an iterative debanding process is also proposed.

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