Information processing method and apparatus
US6810131B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2000 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | May 15, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/902
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an image encoding apparatus for receiving and encoding an image signal, the input image signal is encoded in units of blocks in accordance with an encoding parameter via a DCT device, quantizer, and variable-length encoder. The encoded codes are multiplexed together with information indicating the presence/absence of scrambling, authentication data, a quantization parameter used in the quantizer, and a quantization parameter obtained by converting this quantization parameter. A copyrighted image signal is scrambled upon encoding, an image decoding apparatus of an authentic viewer normally plays back, and an image decoding apparatus of an unauthentic viewer plays back an image with which the viewer can recognize its outline.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.