Compressed video graphics system and methodology
First Claim
Patent Images
1. A method of processing video and graphics data for display comprising:
- storing a plurality of graphics elements produced by graphics signals at least partly coded in a compressed video signal format;
obtaining a base video image formed by a video signal coded in a compressed video signal format the same as, or functionally compatible with, the compressed video signal format in which the graphics elements are coded;
selecting a graphics element from among said plurality of graphics elements;
combining the base video image and the selected graphics element coded in said compressed video signal format to produce combined base video and selected graphic image signals in the compressed video signal format; and
decoding the combined base video and selected graphics element signals for display.
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Abstract
Graphics in the same compressed digital format as that of a target video image are combined, on the fly, by an application. Combination is performed by frame modification or overlay techniques. In the preferred embodiment, the compressed video image format conforms to an MPEG-2 compression standard. A base image is produced by an I-frame, and MPEG-2 graphics elements formed either by modifying the I-frame or overlaying the I-frame with one or more P-frames.
104 Citations
17 Claims
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1. A method of processing video and graphics data for display comprising:
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storing a plurality of graphics elements produced by graphics signals at least partly coded in a compressed video signal format; obtaining a base video image formed by a video signal coded in a compressed video signal format the same as, or functionally compatible with, the compressed video signal format in which the graphics elements are coded; selecting a graphics element from among said plurality of graphics elements; combining the base video image and the selected graphics element coded in said compressed video signal format to produce combined base video and selected graphic image signals in the compressed video signal format; and decoding the combined base video and selected graphics element signals for display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for producing a video graphics display, comprising:
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a first port for receiving a video stream in a compressed digital format; a second port for receiving user selection input signals; a memory for storing a plurality of graphic images in the form of graphics signals in a compressed digital format the same as, or functionally compatible with, that of the video stream; a controller logically configured for creating a graphic image and producing a corresponding graphic image signal in response to an application signal in the video stream or a user selection input signal received at said second port; and a decoder connected to be responsive to the video stream and graphics signals for producing a composite output signal in said compressed digital format. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification