1
Robert O Eifrig, Xuemin Chen, Ajay Luthra: Prediction and coding of bi-directionally predicted video object planes for interlaced digital video. General Instrument Corporation, Barry R Lipsitz, Ralph F Hoppin, November 23, 1999: US05991447 (258 worldwide citation)

A system for coding of digital video images such as bi-directionally predicted video object planes (B-VOPs), in particular, where the B-VOP and/or a reference image used to code the B-VOP is interlaced coded. For a B-VOP macroblock which is co-sited with a field predicted macroblock of a future anch ...


2
Robert O Eifrig, Xuemin Chen, Ajay Luthra: Motion estimation and compensation of video object planes for interlaced digital video. General Instrument Corporation, Barry R Lipsitz, Ralph F Hoppin, December 21, 1999: US06005980 (191 worldwide citation)

A motion estimation and compensation technique is provided for interlaced digital video such as video object planes (VOPs). Predictor motion vectors for use in differentially encoding a current field coded macroblock are obtained using the median of motion vectors of surrounding blocks or macroblock ...


3
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 ...


4
Robert O Eifrig, Xuemin Chen, Ajay Luthra: Motion estimation and compensation of video object planes for interlaced digital video. General Instrument Corporation, Barry R Lipsitz, Ralph F Hoppin, February 15, 2000: US06026195 (178 worldwide citation)

A motion estimation and compensation technique is provided for interlaced digital video such as video object planes (VOPs). Predictor motion vectors for use in differentially encoding a current field coded macroblock are obtained using the median of motion vectors of surrounding blocks or macroblock ...


5
Robert O Eifrig, Xuemin Chen, Ajay Luthra: Intra-macroblock DC and AC coefficient prediction for interlaced digital video. General Instrument Corporation, Barry R Lipsitz, Ralph F Hoppin, October 26, 1999: US05974184 (165 worldwide citation)

DC and AC DCT transform coefficients of an INTRA coded block are differentially encoded by selecting predictor DC and AC coefficients from a left-hand neighboring block and a top neighboring block. Each block is coded according to a frame mode, a reordered field mode, and a non-reordered field mode. ...


6
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 ...


7
Xuemin Chen, Ajay Luthra, Ganesh Rajan, Mandayam Narasimhan: Temporal and spatial scaleable coding for video object planes. General Instrument Corporation, Barry R Lipsitz, Ralph F Hoppin, May 2, 2000: US06057884 (158 worldwide citation)

Temporal and spatial scaling of video images including video object planes (VOPs) in an input digital video sequence is provided. Coding efficiency is improved by adaptively compressing scaled field mode video. Upsampled VOPs in the enhancement layer are reordered to provide a greater correlation wi ...


8
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 ...


9
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 ...


10
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 ...