2 dimensional signal encoding/decoding method and device
US8265402B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 2011 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | Sep 6, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/64
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image is divided into subbands by wavelet transform using the Haar function as the base, and the lowest-frequency LL subband is entirely encoded. LH, HL, and HH subband coefficients which belong to the wavelet decomposition level of each hierarchy are encoded such that coefficients at the same spatial position are encoded based on a resolution or quantization accuracy mapping at each spatial coordinate. Additionally, an updated region detecting means detects an updated region from a plurality of sequential frames forming the two-dimensional signal, and obtains a changing period during which a signal value changes in each region. A resolution or quantization accuracy is set for each spatial coordinate based on the changing period, and a coefficient map is generated in which the resolution or quantization accuracy of the updated region differs from that of a region other than the updated region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.