TH41402B - Decoding methods and devices that achieve fast channel switching of recorded video. - Google Patents

Abstract

DC60 (07/09/45) video decoders (200, 600, 700) and corresponding methods (900) have been described to achieve fast channel switching of the recorded video. Which video decoders (200, 600, 700) for receiving the compressed stream and to organize Prepare decompressed video output, including multiplexers (210, 610, 710) for receiving compressed stream information and for normal separation and switching streams. Normal decoding (212, 612, 712) in signal communication with a multiplex decoding to receive normal and compressed channel change streams and to Provides compression-reduced video output and normal frame storage in communication communications. Signal with normal decoding segment for storing reference images. Video decoders (200, 600, 700) and their corresponding methods (900) have been described to achieve fast channel switching of recorded video. Which video decoders (200, 600, 700) for receiving the compressed stream and to organize Prepare decompressed video output, including multiplexers (210, 610, 710) for receiving compressed stream information and for normal separation and switching streams. Normal decoding (212, 612, 712) in signal communication with a multiplex decoding to receive normal and compressed channel change streams and to Provides compression-reduced video output and normal frame storage in communication communications. Signal with normal decoding segment for storing reference images.

Claims (12)

1. Video decoder (200) for receiving compressed stream data for the preparation of reduced video output, which such decoder consists of: 2. The video decoder as described in claim 1, which also includes a lower-resolution decoding section (618) for signal communication with the demultiplexer for receiving the compressed transition stream; a lower-resolution decoding section (618) for signal communication with the demultiplexer for receiving the compressed transition stream; a storage of at least one transition frame (620) for signal communication with the lower-resolution decoding section for the stored reference image; a riser sampler (622) for signal communication with the lower-resolution decoding section for riser sampling of the reduced video data and selectively outputting such data to at least one of the storage of at least one normal frame and at least one display section. 3. A video decoder as specified in claim 1, which also includes a post-processing filter (716) for signal communication with the normal decoding section for post-processing of the video data that has been selectively reduced and output to at least one normal frame storage and at least one display section. 4. A video decoder as specified in Claim 1, which also includes a device for selecting the recorded image for decoding from one stream of normal and transition streams. 5. A video decoder as specified in claim number 4, which also includes a device for sampling the upstream image of a low-resolution transition stream. 6. A video decoder as specified in claim 1, which also includes a device for decoding redundant video syntax according to ITU-T H.264 [ISO/IEC MPEG 14496-10 as well?]. 7. A video decoder as specified in Claim 1, which also includes devices for decoding video signals, converting user data to a consistent normal video stream. 8. A video decoder as specified in Claim 1, which also includes a device for responding to signals from the encoder indicating to use the normal stream or transition stream for images encoded in a sub-stream in the transition stream thereafter. 9. A video decoder as specified in claim number 4, which also includes a device for post-processing the normal decoder output to reduce discontinuity in the transition from lower quality output to normal quality output. 10. A method for decoding video (900) for receiving compressed stream data and for providing reduced video output. This method includes receiving the compressed stream data (912) and separating the normal and channel switching streams (914), receiving at least one stream from the compressed normal and channel switching streams and providing reduced video output (916), and storing a reference image for use in decoding inter-encoded images (918). 11. The video decoding method as specified in claim 10 shall, in addition, consist of at least one of the following: selection of the compressed image for decoding from one normal stream and from the channel transition stream, which takes the uplink sample of the lower resolution channel transition stream image; decoding of redundant image syntax according to the JVT standard; decoding of the channel transition image from the user data of the corresponding normal stream image, which responds to a signal from the encoder indicating to use the normal stream or channel transition image for the image that is partially encoded within the channel transition stream; and post-output processing of the normal decoder to reduce discontinuities in the transition from lower quality to normal quality output. 12. A compressed digital video signal consisting of a first block transform coefficient corresponding to the normal video quality stream and a second block transform coefficient corresponding to the channel switching stream.