Image signal recording and reproducing system with use of bandwidth compression coding
US5319468A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Apr 17, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/107
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording and reproducing system for digitizing the image signal and compression coding the signal by in-field and inter-field, or in-frame and inter-frame coding, wherein the inter-field or inter-frame coding is used as the primary coding method, in field or in-frame coding is applied at a regular interval, and when scene changes are detected, in-field or in-frame coding is mandatorily applied to the field or frame immediately after the scene change. Furthermore, a new in-field or in-frame coding cycle is started at the field or frame immediately after the scene change to absorb the increased information resulting from in-field or in-frame coding by increasing the compression ratio of the inter-field or inter-frame coding means within the period to the next in-field or in-frame coded field or frame. The generation of additional information is further reduced and the increase in information produced by the field or frame immediately after the scene change is absorbed by a data substitution, specifically by absorbing the increase in information generated by the field or frame immediately after the scene change by using the same data as that of the immediately preceding field or fr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.