Video transcoding apparatus
January 3, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDigital television signal compression apparatus Device, method and system for variable bit-rate packet video communications Method and apparatus for coding and decoding digital image data using image quantization modification Motion vector extrapolation for transcoding video sequences Video transcoder with bitstream look ahead for rate control and statistical multiplexing Method for inserting a visual element into an MPEG bit stream Apparatus and methods for down-conversion video de-interlacing Patent #: 6898243 InventorAssigneeApplicationNo. 10034380 filed on 01/03/2002US Classes:375/240.03, Quantization375/240.05, Feed back375/240.07, Feed back375/240.25, Specific decompression process375/240.26, Associated signal processing382/251, Quantization382/233, Including details of decompression382/239, Adaptive coding (i.e., changes based upon history, activity, busyness, etc.)382/246, Huffman or variable-length coding382/245, Run-length coding348/448, Line doublers type (e.g., interlace to progressive IDTV type)709/232, Computer-to-computer data transfer regulating375/240.16, Motion vector375/240.14PluralExaminersPrimary: An, Shawn S.Attorney, Agent or FirmInternational ClassH04B 1/66AbstractDisclosed is a video transcoding apparatus converting a specific bit rate of an MPEG (moving pictures experts group) bit stream into a different rate thereof for transportation. The present invention includes a video pre-processing unit having a predetermined matrix structure and down-sampling a macro block decoded by the video decoder by transforming the macro block into a corresponding picture structure to the compressed video bit stream, a transcoding parameter control unit detecting information about a picture from a previous bit stream variable-length-decoded by the video decoder and setting up an encoding mode for a transcoding in accordance with the detected information, etc. Therefore, the present invention does not need the motion estimation unit of encoder and reduce the complexity of the bit allocation unit. When changing HD-rated MPEG sequence over 10 Mbps into NTSC-rated MPEG sequence below 6 Mbps, the present invention reduces calculation time and complexity of hardware.Field of SearchQuantizationFeed back Feed forward Motion vector Subsampling Variable length coding Block coding Specific decompression process Associated signal processing Feed back Assignment of variable bandwidth or time period for transmission or reception Including details of decompression Pyramid, hierarchy, or tree structure Quantization Adaptive coding (i.e., changes based upon history, activity, busyness, etc.) Huffman or variable-length coding Run-length coding | |
