Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Patent
1996-10-18
1999-07-20
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
345433, G06T 300
Patent
active
059261870
ABSTRACT:
A video overlay system includes a bus device including a processor, a local memory, a video interface, and a DMA unit. A host computer passes to the processor the locations of one or more video windows in a graphics image, and the processor prepares a video pixel map in local memory which corresponds the size of the graphics image. The video pixel map has video data for one or more video images in the locations of the video window. The remainder of the video pixel map contains dummy values. The DMA unit moves pixel values from the local memory to the video interface, and the video interface provides the pixel values including both video data and dummy values to an encoder in synchronization with pixel values from another source which represent the graphics image. The encoder generates a video signal from pixel values representing the graphics image except when a key value occurs. When the key value occurs, the encoder uses a pixel value from the video interface in place of the key value.
REFERENCES:
patent: 5634040 (1997-05-01), Her et al.
patent: 5701184 (1997-12-01), Motoyama
patent: 5706417 (1998-01-01), Adelson
patent: 5706419 (1998-01-01), Matsugu et al.
Millers David T.
Nguyen Phu K.
Samsung Electronics Co,. Ltd.
Vo Cliff N.
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