Method and device for data encoding and method for data transmission
US6628713B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1999 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Apr 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/147
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention generates coded data having always high image quality irrespective of the change amount of a picture. When a difference between two adjacent frames in inputted picture data is calculated as well as a motion vector between the above frames is calculated, and the picture data is encoded based on the difference and the motion vector between the above frames as well as the motion vector is encoded, a scene change in the above picture data is detected based on the difference between the two adjacent frames in the picture data, and the feature quantity of the picture data is calculated. If the above feature quantity exceeds a prescribed threshold value, the number of pixels of the picture data is reduced in a prescribed conversion ratio at the prescribed timing according to the detected scene change. And the picture data and the motion vector are encoded so as to be the amount of generating codes obtained by allotting the amount of signal of the motion vector representing the movement of the picture data reduced based on the picture data reduced in pixel, to the amount of signal of the picture data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.