Video capture, compression and display system, including averaging of chrominance information
US5053864A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1989 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Jun 1, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/641
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The system is controlled by a control receiver receiving commands from the external computer across a primary control bus. A captured unit captures digital samples from a composite video signal and transfers them to a memory unit across a capture bus. The memory unit stores samples for two complete frames in four memory banks. The samples are transferred across a data bus to an external computer at addresses given by the computer on an address bus. The computer separates the samples into their luminance, inline and quadrature components, averages the inline component and the quadrature component for an area of two pixels by two pixels. The luminance component and the averaged inline and quadrature component are stored in the memory banks. The samples are stored as 5 luminance bits with 3 inline or quadrature bits for similar addresses in each of the four memory banks. During display all of the luminance and chrominance bits for a given area are latched by the memory unit and read by the display unit. The display unit has two multiplexers selecting the appropriate luminance bits for display for the appropriate pixel in a line and a third multiplexer selecting which line is to be dis…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.