Patent · US Active

Image compression method with variable quantization parameter

US8428381B2 · kind B2 · utility

1Cited by

5References

8Claims

0Family size

Assignee

Altek Corporation · TW

Inventors

Chen-Hung Chan · Daxi District, TW
Hong-Long Chou · Taipei, TW

Key dates

Filing date	Jun 4, 2010
Grant date	Apr 23, 2013
Priority date	—
Expiry date	Oct 7, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/14
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An image compression method s used for processing a plurality of pixels of an image. The image compression method includes the steps of receiving N successive pixels; obtaining N pixel differences and N map differences corresponding to the N pixels according to values of the N pixels through differential pulse code modulation; calculating to obtain a quantization reference value corresponding to the N pixels according to the N pixel differences; obtaining a quantization parameter corresponding to the N pixels according to the quantization reference value; and encoding the N map differences according to the quantization parameter.

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