Display refresh memory with variable line start addressing
Video retouching system
Method and apparatus for enhancing video displays
Color display apparatus and method of coding a color image
Multilevel grey scale or composite video to RGBI decoder
Enhanced video graphics controller
Graphics system for video and printed images Patent #: 4829455
ApplicationNo. 519977 filed on 05/07/1990
US Classes:345/603, Format change (e.g., NTSC to RGB, RGB to composite, XYZ to RGB)348/660Digital
ExaminersPrimary: Oberley, Alvin E.
Assistant: Luu, Matthew
Attorney, Agent or Firm
Foreign Patent References
International ClassG09G 001/28
AbstractMethod and apparatus process a composite video signal, converted it to component video signals which are processed digitally to produce reprogrammable digital RGB graphics signals. Specifically, a composite video signal is first digitized and then processed to convert digitized YUV component video signals into digitized RGB signals by means of a RAM-based table lookup technique optimized to the resolution of each of the component signals so as to minimize memory requirements and computation overhead. In a specific embodiment, a Y or luminance signal having a resolution of 6 bits is employed in connection with a V component signal having a resolution of 5 bits and a U component signal having a resolution of 3 bits without noticeable degradation of RGB color quality.