1
Limin Wang, Rajeev Gandhi, Krit Panusopone, Ajay Luthra: Macroblock level adaptive frame/field coding for digital video content. General Instrument Corporation, Laurence T Cullen, December 27, 2005: US06980596 (186 worldwide citation)

A method and system of encoding and decoding digital video content. The digital video content comprises a stream of pictures which can each be intra, predicted, or bi-predicted pictures. Each of the pictures comprises macroblocks that can be further divided into smaller blocks. The method entails en ...


2
Limin Wang, Ajay Luthra: Dynamic bit allocation for statistical multiplexing of compressed and uncompressed digital video signals. Motorola, General Instrument Corporation, Barry R Lipsitz, December 26, 2000: US06167084 (162 worldwide citation)

The present invention relates to a method and apparatus for allocating bits in a statistical multiplexing system (stat mux). A statistical multiplexer (stat mux) accommodates both compressed and uncompressed video programs using transcoding and encoding, respectively. Hierarchical dynamic bit alloca ...


3
Xuemin Chen, Limin Wang, Ajay Luthra, Robert O Eifrig: Method of architecture for converting MPEG-2 4:2:2-profile bitstreams into main-profile bitstreams. General Instrument Corporation, Barry R Lipsitz, July 10, 2001: US06259741 (107 worldwide citation)

A system for converting the color format of a digital video bitstream. The system accounts for the allowable formats of the pre- and-post-conversion bitstreams, including quantizer precision level, and whether luma and chroma data have separate quantization matrices, or share a common quantization m ...


4
Limin Wang, Ajay Luthra: Multi-functional transcoder for compressed bit streams. General Instrument Corporation, Barry R Lipsitz, Douglas M McAllister, August 13, 2002: US06434197 (97 worldwide citation)

A method and apparatus for transcoding digital video data, for example, at the headend of a cable or satellite television network. A generic multi-functional transcoder architecture has a “post-pre-processing engine” that provides a number of processing functions for implementing desired format conv ...


5
Limin Wang, Ajay Luthra, Robert O Eifrig: Rate control for an MPEG transcoder without a priori knowledge of picture type. General Instrument Corporation, Barry R Lipsitz, Douglas M McAllister, May 27, 2003: US06570922 (91 worldwide citation)

A rate control system suitable for use with a digital video transcoder, such as one conforming to the MPEG standard. The proposed rate control system starts coding with any reasonable set of assumed Group of Pictures (GOP) parameters, thereby avoiding a processing delay of about one GOP which would ...


6
Limin Wang, Ajay Luthra, Paul Moroney: Apparatus and methods for transcoder-based adaptive quantization. General Instrument Corporation, Charles J Kulas, Townsend and Townsend and Crew, August 27, 2002: US06441754 (74 worldwide citation)

The present invention provides a transcoding architecture and a consumer set-top box with storage capability that is based on the transcoding architecture and capable of operating efficiently in an all-digital environment. In a preferred embodiment, a digital-VIDEO DEVICE employs an MPEG-2 compliant ...


7
Limin Wang: Statistical multiplexer and remultiplexer that accommodates changes in structure of group of pictures. General Instrument Corporation, Barry R Lipsitz, Douglas M McAllister, November 4, 2003: US06643327 (45 worldwide citation)

A system for rate control during transcoding and encoding of digital video data in a multi-program transmission environment accommodates changes in the GOP structure of any of the programs, e.g., due to a commercial insertion or the like. A hierarchical bit allocation scheme is used, where bits are ...


8
Limin Wang, David M Baylon, Krit Panusopone, Rajeev Gandhi, Yue Yu, Ajay Luthra: Frequency coefficient scanning paths for coding digital video content. General Instrument Corporation, Robert P Marley, January 17, 2006: US06987888 (38 worldwide citation)

A method and system of transform-based encoding, decoding, and bitstream generation of digital video content. The digital video content comprises a stream of pictures, slices, or macroblocks which can each be intra, predicted or bi-predicted pictures. The pictures, slices, or macroblocks comprise bl ...


9
Limin Wang, David M Baylon, Krit Panusopone, Rajeev Gandhi, Yue Yu, Ajay Luthra: Frequency coefficient scanning paths for coding digital video content. General Instrument Corporation, Benjamin D Driscoll, February 13, 2007: US07177475 (35 worldwide citation)

A method and system of transform-based encoding, decoding, and bitstream generation of digital video content. The digital video content comprises a stream of pictures, slices, or macroblocks which can each be intra, predicted or bi-predicted pictures. The pictures, slices, or macroblocks comprise bl ...


10
Limin Wang: Rate control and buffer protection for variable bit rate video programs over a constant rate channel. General Instrument Corporation, Barry R Lipsitz, December 10, 2002: US06493388 (35 worldwide citation)

A system for rate control and buffer management during coding of multiple variable bit rate digital video programs over a constant bit rate channel. The system is suitable for use in a hierarchical bit allocation scheme that includes a super group of pictures (GOP) level, a super frame level, and a ...