Patent · US Active

Method and apparatus for adjusting quantization parameter for adaptive quantization

US11490084B2 · kind B2 · utility

0Cited by

10References

18Claims

0Family size

Assignee

BEIJING BAIDU NETCOM SCIENCE TECHNOLOGY CO., LTD. · CN

Inventors

Ke Lin · Beijing, CN
Wenpeng Ding · Hefei, CN

Key dates

Filing date	Jun 21, 2021
Grant date	Nov 1, 2022
Priority date	—
Expiry date	Jun 21, 2041

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/59
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An implementation of a method for adjusting a quantization parameter for adaptive quantization may include: acquiring at least one pixel block corresponding to a to-be-compressed image and an initial quantization parameter adjustment value corresponding to the pixel block, the initial quantization parameter adjustment value being generated based on an image objective quality evaluation index; determining a just noticeable difference, JND, threshold corresponding to each pixel point in the at least one pixel block; determining a block JND threshold corresponding to each pixel block, based on the JND threshold corresponding to each pixel point in the at least one pixel block; and adjusting the corresponding initial quantization parameter adjustment value based on the block JND threshold to generate an adjusted quantization parameter adjustment value corresponding to the at least one pixel block.

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