Method for compressing image and device using the same
US10984561B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2019 |
| Grant date | Apr 20, 2021 |
| Priority date | — |
| Expiry date | Sep 3, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/184
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disclosure provides a method for image compression and a device using the same method. The method includes: retrieving an image block including pixels, wherein each pixel include a plurality of channel data; defining root nodes according to an image compressing ratio of the image block; categorizing each channel data of each pixel into groups corresponding to the root nodes, wherein a structure of each group is a binary tree; if an empty tree exists in the aforementioned groups, dividing an non-empty tree of the groups into sub-trees and replacing the empty tree and the non-empty tree with the sub-trees to update the groups and the root nodes; building a center value of each group and determining a group index of each channel data of each group; encoding the center value of each group and characterizing each channel data as the corresponding center value and the group index to compress each channel data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.