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31. 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

32. 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.

33. 发明专利

CA2208950A1 RATE CONTROL FOR STEREOSCOPIC DIGITAL VIDEO ENCODING 未知
公开(公告)号：CA2208950A1
公开(公告)日：1998-01-03
申请号：CA2208950
申请日：1997-06-27
申请人： GEN INSTRUMENT CORP
发明人： CHEN XUEMIN
IPC分类号： H04N7/32 , G06T9/00 , H03M7/36 , H04N7/24 , H04N7/26 , H04N7/50 , H04N13/00 , H04N19/597 , H04N13/02
摘要： 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 invention can maintain a consistent image quality by providing additional quantization bits for disparity-predicted P-pictures, for example, where a P-frame may be encoded from a B-frame in the enhancement layer. The selected quantization level corresponds to an overall bit rate requirement of the enhancement layer. For disparity predicted P-frames, the quantization step size is modified according to the activity level of the frame being encoded in the enhancement layer, or of the reference frame, whichever is greater. Also, image quality is improved and frame freeze up is prevented during editing modes such as fast forward and fast rewind which require random access to the picture data. When the reference frame in the base layer is the first frame of a group of pictures (GOP), the corresponding enhancement layer frame will be encoded as an I or P frame instead of as a B frame to improve image quality and eliminate or reduce error propagation during random access.

34. 发明专利

NO973602D0 未知
公开(公告)号：NO973602D0
公开(公告)日：1997-08-05
申请号：NO973602
申请日：1997-08-05
申请人： GEN INSTRUMENT CORP
发明人： CHEN XUEMIN , LIU VINCENT
IPC分类号： G06T7/00 , H04N7/32 , G06T9/00 , H03M7/40 , H04N13/00 , H04N
摘要： Disparity estimation between the right and left view pixel luminance values in a stereoscopic video signal is optimized by determining the minimum least-square-error between macroblocks of the right and left view pictures. Affine transform coefficients and disparity vectors which correspond to the minimum error are also determined and transmitted in the data stream for use by a decoder in reconstructing the right view picture. The scheme can be implemented either locally, at the macroblock level, or globally, at the picture level. At the macroblock level, least-square-error optimization may occur for each individual macroblock in the right view picture. In this case, affine transform coefficients are provided for each macroblock. At the picture level, the sum of the least-square-errors is minimized after the blocks of the right view picture are matched to the left view picture. In this case, only one set of affine transform coefficients are required for the entire right view picture. Or, block matching between an affinely transformed left view picture and the right view picture may be performed after minimizing the sum of the least-square-errors. The scheme is particularly useful in minimizing the effects of cross-channel luminance imbalances due to camera variations and scenes with significant changes in brightness or contrast, and is compatible with stereoscopic video systems such as the MPEG Multi-view Profile (MVP) system.

35. 发明专利

BRPI9911289B1 Aparelho codificador, método de codificação, aparelho decodificador e método para produzir um fluxo de bits 未知
公开(公告)号：BRPI9911289B1
公开(公告)日：2015-06-16
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 , H04N19/61 , G06T9/00 , H04N7/50

36. 发明专利

CA2364478C METHOD AND ARCHITECTURE FOR CONVERTING MPEG-2 4:2:2-PROFILE BITSTREAMS INTO MAIN-PROFILE BITSTREAMS 未知
公开(公告)号：CA2364478C
公开(公告)日：2011-07-05
申请号：CA2364478
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： H04N7/26 , G06T9/00
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 common 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 by 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 representing 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 function (335). Adjustment (130, 230, 382), of the quantization precision is provided as required. A transcoding function (800) can also be achieved.

37. 发明专利

CA2230567C MOTION ESTIMATION AND COMPENSATION OF VIDEO OBJECT PLANES FOR INTERLACED DIGITAL VIDEO 未知
公开(公告)号：CA2230567C
公开(公告)日：2010-07-06
申请号：CA2230567
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.

38. 发明专利

DE60140008D1 未知
公开(公告)号：DE60140008D1
公开(公告)日：2009-11-05
申请号：DE60140008
申请日：2001-08-30
申请人： GEN INSTRUMENT CORP
发明人： CHEN XUEMIN , PANUSOPONE KRIT , LING FAN
IPC分类号： H04N19/40 , H04N19/46
摘要： A method and apparatus are disclosed by which a translucent logo is inserted into the transcoded digital bitstream of an MPEG transcoder without changing the digital nature of the bitstream. Such an MPEG transcoder has cascaded decoding and encoding sections. A translucent logo is generated and is added to the reconstructed video image produced by the decoder section of the MPEG transcoder upstream of the transcoder's encoding section. The encoding section of the transcoder then encodes the bitstream which includes the translucent logo.

39. 发明专利

DE69932429T2 未知
公开(公告)号：DE69932429T2
公开(公告)日：2007-03-08
申请号：DE69932429
申请日：1999-04-27
申请人： GEN INSTRUMENT CORP
发明人： CHEN XUEMIN
IPC分类号： H04N7/50 , G06T9/00 , H04N7/26
摘要： Inverse quantization (36, 44, 60) of a two-dimensional array of video coefficients QF[v][u] is provided. A first weighting matrix {overscore (W)}[0][v][u]=2*W[0][v][u] for intra-coded macroblocks and a second weighting matrix {overscore (W)}[1][v][u]=2*W[1][v][u] for non-intra-coded macroblocks are pre-computed and stored (88). A quantization difference (quanti+1)to be used in selecting a weight factor is computed (70) based on a current macroblock quantization level. The weight factor is output from one of the weighting matrices in response to the quantization difference and a macroblock type identifier (66) (i.e., intra-coded or non-intra-coded). Subsequent weights Wi+1[w][v][u] are then computed (86) from a current weight Wi[w][v][u] and the weight factor. The array of coefficients QF[v][u] is multiplied (92) by the weights Wi+1[w][v][u] to reconstruct unquantized coefficients.

40. 发明专利

CA2230422C INTRA-MACROBLOCK DC AND AC COEFFICIENT PREDICTION FOR INTERLACED DIGITAL VIDEO 未知
公开(公告)号：CA2230422C
公开(公告)日：2006-01-31
申请号：CA2230422
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： H04N7/50 , H04N19/625 , G06T9/00 , H04N7/26 , H04N7/30 , H04N7/32 , H04N7/36 , 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.

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