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11. 发明专利

DE69938093T2 未知
公开(公告)号：DE69938093T2
公开(公告)日：2009-04-30
申请号：DE69938093
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.

12. 发明专利

AU2003278875A1 METHODS AND APPARATUS FOR PROCESSING PROGRESSIVE I-SLICE REFRESHED MPEG DATA STREAMS TO ENABLE TRICK PLAY MODE FEATURES ON A DISPLAY DEVICE 未知
公开(公告)号：AU2003278875A1
公开(公告)日：2004-04-19
申请号：AU2003278875
申请日：2003-09-23
申请人： GEN INSTRUMENT CORP
发明人： ANDERES WALTER , KIMBALL BRIDGET DIANE , BAKER PAUL DOUGLAS , EIFRIG ROBERT O
IPC分类号： H04N5/783 , H04N9/804
摘要： A display device with personal versatile recorder capabilities is provided which is capable of processing progressive I-slice refreshed MPEG data streams to enable trick play mode features. The display device comprises a receiver for receiving a progressive I-slice refreshed MPEG data stream having I-slices distributed over multiple P-frames. The display device further comprises a syntax parser for parsing the data stream to locate I-slices which make up an I-frame. A storage device is provided for storing the data stream. The display device also comprises an interface for receiving a command for a trick play mode feature. A processor associated with the syntax parser recovers the located I-slices from the storage device and assembles the recovered I-slices into one or more constructed I-frames. A decoder is provided for decoding the constructed I-frames to enable the trick play mode features.

13. 发明专利

CA2364478A1 METHOD AND ARCHITECTURE FOR CONVERTING MPEG-2 4:2:2-PROFILE BITSTREAMS INTO MAIN-PROFILE BITSTREAMS 未知
公开(公告)号：CA2364478A1
公开(公告)日：2000-11-23
申请号：CA2364478
申请日：2000-02-16
申请人： GEN INSTRUMENT CORP
发明人： CHEN XUEMIN , LUTHRA AJAY , EIFRIG ROBERT O , WANG LIMIN
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 (355) precision level, and whether luma and chroma data have separate quantization matrices (385, 390), or share a commo n quantization matrix. In a particular implementation, an MPEG-2 4:2:2P bitstream having a color format of 4:2:2 or 4:2:0 is converted to an MP bitstream having a color format of 4:2:0. Coding efficiencies are achieved b y using the luma quantization matrix (390) to re-quantize the chroma data, and re-using luma motion vectors MV for performing motion compensation (320, 325 , 510) of the chroma data. Further efficiencies can be achieved by representin g a 4:2:2 reference picture in a 4:2:0 format for converting intercoded frames , and changing the position of a pixel downsizing filter (340) and clip functi on (335). Adjustment (130, 230, 382), of the quantization precision is provided as required. A transcoding function (800) can also be achieved.

14. 发明专利

AU5740198A Motion estimation and compensation of video object planes for interlaced digital video 未知
公开(公告)号：AU5740198A
公开(公告)日：1998-09-10
申请号：AU5740198
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： H04N7/32 , G06T9/00 , H03M7/36 , H04N7/26 , H04N7/30 , H04N7/36 , H04N7/50 , H04N19/593 , H04N19/94 , H04N7/28

15. 发明专利

AU5740098A Prediction and coding of bi-directionally predicted video object planes for interlaced digital video 未知
公开(公告)号：AU5740098A
公开(公告)日：1998-09-10
申请号：AU5740098
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： 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).

16. 发明专利

AU5739998A Intra-macroblock DC and AC coefficient for interlaced digital video 未知
公开(公告)号：AU5739998A
公开(公告)日：1998-09-10
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.

17. 发明专利

NO980949A 未知
公开(公告)号：NO980949A
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 , H04N7/34 , H04N7/36 , H04N7/46 , H04N7/50
CPC分类号： H04N19/649 , H04N19/105 , H04N19/107 , H04N19/112 , H04N19/137 , H04N19/186 , H04N19/51 , H04N19/517 , H04N19/56 , H04N19/563 , H04N19/577 , H04N19/583 , H04N19/593 , H04N19/61 , H04N19/63

18. 发明专利

NO980950D0 未知
公开(公告)号：NO980950D0
公开(公告)日：1998-03-05
申请号：NO980950
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 , G06T9/00 , H03M7/36 , H04N7/26 , H04N7/30 , H04N7/36 , H04N7/50 , H04N19/593 , H04N
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.

19. 发明专利

CA2425921C TRANSCODER-MULTIPLEXER (TRANSMUX) SOFTWARE ARCHITECTURE 未知
公开(公告)号：CA2425921C
公开(公告)日：2013-05-28
申请号：CA2425921
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 , H04N7/50
摘要： A digital video transcoder-multiplexer (transmux) architecture that is fully software-implemented. The transmux (200) includes transcoder processing elements (TPEs) (240) that may use a very long instruction word (VLIW) media processor (105) for performing transcoding, and de-assembly and re-assembly at a transport stream level, and a co-processor (131) 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.

20. 发明专利

DE69938093D1 未知
公开(公告)号：DE69938093D1
公开(公告)日：2008-03-20
申请号：DE69938093
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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