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
Krit Panusopone, Xuemin Chen: Video size conversion and transcoding from MPEG-2 to MPEG-4. General Instrument Corporation, Barry R Lipsitz, Douglas M McAllister, November 11, 2003: US06647061 (204 worldwide citation)

A transcoder architecture that provides the lowest possible complexity with a small error, e.g., for converting an MPEG-2 bitstream into an MPEG-4 bitstream. The transcoder reads header information from an input bitstream and provides a corresponding header in the new format for the output bitstream ...


3
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 (193 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 ...


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 (166 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
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 (163 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 ...


7
Xuemin Chen, Vincent Liu: Scene change detector for digital video. General Instrument Corporation, Barry R Lipsitz, Ralph F Hoppin, May 12, 1998: US05751378 (134 worldwide citation)

In a method for detecting a scene change between a prior video picture and a current video picture of a sequence of pictures, an average luminance value is determined for a block pair of the prior and current video pictures. Preferably, the blocks of the block pair are located, respectively, in the ...


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
Xuemin Chen: Rate control for stereoscopic digital video encoding. General Instrument Corporation, Barry R Lipsitz, Ralph F Hoppin, June 6, 2000: US06072831 (106 worldwide citation)

Rate control in a stereoscopic digital video communication system is accomplished by modifying the quantization level of P or B-frame data in the enhancement layer depending on whether the frame is temporally predicted (from the same layer) or disparity predicted (from the opposite layer). The inven ...


10
Robert O Eifrig, Fan Ling, Xuemin Chen: Transcoder-multiplexer (transmux) software architecture. General Instrument Corporation, Barry R Lipsitz, Douglas M McAllister, June 8, 2004: US06748020 (104 worldwide citation)

A digital video transcoder-multiplexer (transmux) architecture that is fully software-implemented. The transmux includes transcoder processing elements (TPEs) that may use a very long instruction word (VLIW) media processor for performing transcoding, and de-assembly and re-assembly at a transport s ...