Color video processing circuitry
US4916531A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1988 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Mar 23, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/67
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Circuitry for converting digital red, green, blue (RGB) inputs into digital saturation and hue outputs comprising hardwired digital components connected to receive the digital RGB inputs and to perform arithmetic manipulations of them so as to provide a digital saturation output representing saturation for the RGB inputs and to provide a digital first intermediate output, and a first look-up memory storing digital hue data representing hue of the digital RGB inputs at addresses corresponding to values of the digital first intermediate output, the look-up memory being connected to the hardwired digital components to be addressed by the digital intermediate output, the memory providing a digital hue output. Also disclosed are: circuitry for converting digital hue data, digital saturation data, and brightness-related digital data into digital RGB outputs using a further look-up memory that is addressed by the hue data and provides an intermediate output used with the saturation data and brightness-related data by hardwired components to provide digital RGB outputs; a fixed point divider including bit subcircuits that each include an adder, a multiplexer and a bit shifting element; and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.