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21. 发明专利

NZ509326A Video encoder and encoding method with buffer control 未知
公开(公告)号：NZ509326A
公开(公告)日：2002-09-27
申请号：NZ50932699
申请日：1999-05-28
申请人： GEN INSTRUMENT CORP
发明人： EIFRIG ROBERT O , CHEN XUEMIN
IPC分类号： G06T9/00 , H04N7/26 , H04N7/50
摘要： A technique is provided for enabling data, such as video, to be broadcast using a push dataflow scenario without causing a data rate buffer for the pushed data at a decoder to overflow or underflow. At an encoder, data are encoded for communication to the decoder to provide an output bitstream. The data rate buffer of the decoder is simulated at the encoder. The simulation is used to control the output bitstream to preclude overflow or underflow of the decoder buffer. For example, a complementary encoder buffer, which operates in a manner opposite to the decoder buffer, can be monitored and inverted to provide the simulation. Various different techniques are disclosed for controlling the amount of data produced at the encoder to maintain the data within the confines of the decoder buffer.

22. 发明专利

AU3237602A Transcoder-multiplexer (transmux) software architecture 未知
公开(公告)号：AU3237602A
公开(公告)日：2002-05-06
申请号：AU3237602
申请日：2001-10-15
申请人： GEN INSTRUMENT CORP
发明人： EIFRIG ROBERT O , LING FAN , CHEN XUEMIN
IPC分类号： H04N7/26 , H04N7/24
摘要： 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 stream level, and a co-processor for providing de-assembly and re-assembly at an elementary stream level. The processors operate in parallel, at least in part, to optimize throughput and provide processing load balancing. A transmux architecture that is fully software implemented is provided to allow upgrading to handle new functions, fix hardware or software problems, test new processes, adapt to changing customer requirements, and so forth.

23. 发明专利

BR9911289A 未知
公开(公告)号：BR9911289A
公开(公告)日：2001-10-23
申请号：BR9911289
申请日：1999-05-28
申请人： GEN INSTRUMENT CORP
发明人： CHEN XUEMIN , EIFRIG ROBERT O
IPC分类号： H04N7/26 , G06T9/00 , H04N7/50
摘要： A technique is provided for enabling data, such as video, to be broadcast using a push dataflow scenario without causing a data rate buffer for the pushed data at a decoder to overflow or underflow. At an encoder, data are encoded for communication to the decoder to provide an output bitstream. The data rate buffer of the decoder is simulated at the encoder. The simulation is used to control the output bitstream to preclude overflow or underflow of the decoder buffer. For example, a complementary encoder buffer, which operates in a manner opposite to the decoder buffer, can be monitored and inverted to provide the simulation. Various different techniques are disclosed for controlling the amount of data produced at the encoder to maintain the data within the confines of the decoder buffer.

24. 发明专利

AU728469B2 Intra-macroblock DC and AC coefficient prediction for interlaced digital video 未知
公开(公告)号：AU728469B2
公开(公告)日：2001-01-11
申请号：AU5739998
申请日：1998-03-06
申请人： GEN INSTRUMENT CORP
发明人： EIFRIG ROBERT O , CHEN XUEMIN , LUTHRA AJAY
IPC分类号： H04N19/625 , G06T9/00 , H04N7/26 , H04N7/30 , H04N7/32 , H04N7/36 , H04N7/50 , H04N19/176 , H04N19/50 , H04N19/59 , H04N19/593
摘要： DC and AC DCT transform coefficients of an INTRA coded block (310) are differentially encoded by selecting predictor DC and AC coefficients from a left-hand neighboring block (320) and a top neighboring block (340). Each block (310, 320, 340) is coded according to a frame mode, a reordered field mode, and a non-reordered field mode. The AC predictor block is selected according to the respective coding modes of the blocks, and the block in which a DC predictor resides. The top block (340) is selected as an AC predictor when the top block (340) and current block (310) are both reordered field mode, or both frame mode and/or non-reordered field mode, and the DC predictor resides in the top block. Zeroed AC spatial transform coefficients are used in place of the AC spatial transform coefficients from the selected block when the selected block is not INTRA coded, or does not reside in the same Video Object Plane (VOP) as the current block. DC coefficients may be non-linearly quantized.

25. 发明专利

AU7469100A Method and architecture for converting mpeg-2 4:2:2-profile bitstreams into main-profile bitstreams 未知
公开(公告)号：AU7469100A
公开(公告)日：2000-12-05
申请号：AU7469100
申请日：2000-02-16
申请人： GEN INSTRUMENT CORP
发明人： CHEN XUEMIN , WANG LIMIN , LUTHRA AJAY , EIFRIG ROBERT O
IPC分类号： G06T9/00 , H04N7/26
摘要： 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 matrix. In a particular implementation, an MPEG-2 4:2:2 P bitstream having a color format of 4:2:2 or 4:2:0 is converted to a MP bitstream having a color format of 4:2:0. Coding efficiencies are achieved by using the luma quantization matrix to re-quantize the chroma data, and re-using luma motion vectors for performing motion compensation of the chroma data. Further efficiencies can be achieved by representing a 4:2:2 reference picture in a 4:2:0 format for converting inter coded frames, and changing the position of a pixel downsizing filter and clip function. Adjustment of the quantization precision is provided as required. A transcoding function can also be achieved.

26. 发明专利

CA2334785A1 VIDEO ENCODER AND ENCODING METHOD WITH BUFFER CONTROL 未知
公开(公告)号：CA2334785A1
公开(公告)日：1999-12-23
申请号：CA2334785
申请日：1999-05-28
申请人： GEN INSTRUMENT CORP
发明人： EIFRIG ROBERT O , CHEN XUEMIN
IPC分类号： H04N7/26 , G06T9/00 , H04N7/50
摘要： A technique is provided for enabling data, such as video, to be broadcast using a push dataflow scenario without causing a data rate buffer (32) for t he pushed data at a decoder (30) to overflow or underflow. At an encoder (20), data are encoded for communication to the decoder (30) to provide an output bitstream. The data rate buffer (32) of the decoder is simulated at the encoder (22). The simulation is used to control the output bitstream to preclude overflow or underflow of the decoder buffer (32). For example, a complementary encoder buffer (22), which operates in a manner opposite to th e decoder buffer (32), can be monitored and inverted to provide the simulation . Various different techniques are disclosed for controlling the amount of dat a produced at the encoder to maintain the data within the confines of the decoder buffer (32).

27. 发明专利

NO980949L 未知
公开(公告)号：NO980949L
公开(公告)日：1998-09-08
申请号：NO980949
申请日：1998-03-05
申请人： GEN INSTRUMENT CORP
发明人： EIFRIG ROBERT O , CHEN XUEMIN , LUTHRA AJAY
IPC分类号： H04N7/32 , G06K9/00 , G06K9/46 , G06T9/00 , H04N7/26 , H04N7/30 , H04N7/36 , H04N7/46 , H04N7/50 , H04N19/593 , H04N19/94
摘要： A system for coding of digital video images such as bi-directionally predicted video object planes (B-VOPs) (420), in particular, where the B-VOP and/or a reference image (400,440) used to code the B-VOP is interlaced coded. For a B-VOP macroblock (420) which is co-sited with a field predicted macroblock of a future anchor picture (440), direct mode prediction is made by calculating four field motion vectors (MVf,top, MVf,bot, MVb,top, MVb,bot), then generating the prediction macroblock. The four field motion vectors and their reference fields are determined from (1) an offset term (MVD)of the current macroblock's coding vector, (2) the two future anchor picture field motion vectors (MVtop, MVbot), (3) the reference field (405,410) used by the two field motion vectors of the co-sited future anchor macroblock, and (4) the temporal spacing (TRb,top, TRb,bot, TRD,top, TRD,bot), in field periods, between the current B-VOP fields and the anchor fields. Additionally, a coding mode decision process for the current MB selects a forward, backward, or average field coding mode according to a minimum sum of absolute differences (SAD) error which is obtained over the top (430) and bottom (425) fields of the current MB (420).

28. 发明专利

CA2702769C MOTION ESTIMATION AND COMPENSATION OF VIDEO OBJECT PLANES FOR INTERLACED DIGITAL VIDEO 未知
公开(公告)号：CA2702769C
公开(公告)日：2011-10-18
申请号：CA2702769
申请日：1998-02-25
申请人： GEN INSTRUMENT CORP
发明人： EIFRIG ROBERT O , CHEN XUEMIN , LUTHRA AJAY
IPC分类号： H04N7/32 , H04N7/50 , G06T9/00 , H03M7/36 , H04N7/26 , H04N7/30 , H04N7/36 , H04N19/593
摘要： 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 (700) are obtained using the median of motion vectors (MV1, MV2, MV3) of surrounding blocks or macroblocks (712, 722, 732). When a surrounding macroblock (820) is itself interlaced coded, an average motion vector for that macroblock is used, with fractional pixel values being mapped to the half-pixel. When the current block (912) is not interlaced coded but a surrounding block (820) is, the field motion vectors may be used individually or averaged. In a repetitive padding technique for an interlaced coded VOP (1,010), the even (0, 2, ..., 14) and odd (1, 3, ..., 15) lines of the VOP and surrounding block (1,000) are grouped. Within each field (1,210, 1,220), exterior pixels (1,6) are padded by setting them to the value of the nearest boundary pixel (0,6), or to an average of two boundary pixels (0,6; 1,7). The lines are then reordered to provide a single padded reference VOP image.

29. 发明专利

CA2286640C RATE CONTROL FOR MPEG TRANSCODER WITHOUT A PRIORI KNOWLEDGE OF PICTURE TYPE 未知
公开(公告)号：CA2286640C
公开(公告)日：2009-07-14
申请号：CA2286640
申请日：1999-10-18
申请人： GEN INSTRUMENT CORP
发明人： EIFRIG ROBERT O , LUTHRA AJAY , WANG LIMIN
IPC分类号： H04N7/50 , H04N7/26 , H04N7/46 , H04N21/2365 , H04N21/434
摘要： 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 otherwise be incurred to extract the complete GOP structure information from a pre-compressed bit stream. In addition, the system avoids the need to store the data corresponding to the GOP, thereby reducing the memory required for transcoding. Encoding of a first picture in a sequence or GOP begins without a priori knowledge of the picture type of subsequent pictures. A reasonable set of GOP parameters is assumed to determine an encoding bit budget. The bit budget is gradually corrected as successive pictures are coded according to their picture types. Changes in the GOP structure of pre-compressed bitstreams can be addressed, for example, when switching channels, inserting commercials, and the like. Target rates with incorrect starting GOP parameters will converge within a few GOPs.

30. 发明专利

AT385650T 未知
公开(公告)号：AT385650T
公开(公告)日：2008-02-15
申请号：AT99120843
申请日：1999-10-25
申请人： GEN INSTRUMENT CORP
发明人： WANG LIMIN , LUTHRA AJAY , EIFRIG ROBERT O
IPC分类号： H04N7/26 , H04N7/46 , H04N7/50 , H04N21/2365 , H04N21/434
摘要： 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 without a priori knowledge of the Group of Pictures (GOP) parameters, thereby avoiding a processing delay of about one GOP which would otherwise be incurred to extract the complete GOP structure information. In addition, the system avoids the need to store the data corresponding to the GOP, thereby reducing the memory required for transcoding. An initially allocated bit budget is gradually corrected as successive pictures are coded according to their picture types. Changes in the GOP structure of pre-compressed bitstreams can be addressed, for example, when switching channels or inserting commercials. Target rates with incorrect starting GOP parameters will converge within a few GOPs.

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