Low latency video decoder with high-quality, variable scaling and minimal frame buffer memory
AssigneeInternational Business Machines Corporation
InventorsFrancesco A. Campisano, Dennis P. Cheney, David A. Hrusecky
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Abstract
Loss of decoding time prior to the vertical synchronization signal when motion video is arbitrarily scaled and positioned by placing the frame switch point at the completion of frame decoding and synchronizing the bottom border of the scaled image therewith while maintaining low latency of decoded data. High latency operation is provided only when necessitated by minimal spill buffer capacity and in combination with fractional image size reduction in the decoding path in order to maintain image resolution without requiring additional memory.
Claims15
A method of operating a motion video decoder for decoding compressed image data, said method including steps of
- determining a frame switch point in accordance with a signal corresponding to completion of decoding of a previous frame, and
- synchronizing said motion video decoder with a bottom border of a scaled image.
A method of operating a motion video decoder comprising steps of
- testing spill buffer capacity responsive to a signal to produce a test result, and
- controlling scaling in a decoding path of a decoder and altering decoder latency in response to said test result.
Dependencies are inferred from the claim text.