The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 1999
Filed:
Oct. 18, 1996
Hoyoung Kim, San Jose, CA (US);
Samsung Electronics Co., Ltd., Seoul, KR;
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.