Digital versatile disc playback system with efficient modification of subpicture data
US6229523A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1998 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Feb 18, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/426
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a display system having a predefined number, n, of pixel types, a display processor, such as a digital versatile disc (DVD) display processor, includes a color palette which can store more than n color/contrast values and a subpicture bitmap composed of subpicture pixel values, each of which corresponds to one of the n pixel types. In a DVD display system, for example, the DVD subpicture pixel types are: Background, Pattern, Emphasis 1, and Emphasis 2. Each subpicture pixel value is, in turn, related to a color/contrast combination by the color palette, with each pixel value corresponding to the address of a palette location. The corresponding palette location contains the color/contrast value for the related subpicture pixel type. To modify the color/contrast value of a selected group of the pixels having one of the four DVD subpicture pixel types, the display processor updates the color palette, associating new color/contrast values with previously "unused" palette locations. Additionally, pixel values within the bitmap locations which are to have their color/contrast values changed are modified to correspond to the address of the color palette location containing the "new" co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.