公开(公告)号：DE69327015T2

公开(公告)日：2000-06-08

申请号：DE69327015

申请日：1993-05-20

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  KRAUSE EDWARD A ,  LIU VINCENT

IPC: H03M7/30 ,  G06T9/00 ,  H04N7/26 ,  H04N7/30 ,  H04N7/32 ,  H04N7/50 ,  H04N7/24

公开(公告)号：DE69327015D1

公开(公告)日：1999-12-23

申请号：DE69327015

申请日：1993-05-20

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  KRAUSE EDWARD A ,  LIU VINCENT

IPC: H03M7/30 ,  G06T9/00 ,  H04N7/26 ,  H04N7/30 ,  H04N7/32 ,  H04N7/50 ,  H04N7/24

公开(公告)号：DE69229773D1

公开(公告)日：1999-09-16

申请号：DE69229773

申请日：1992-12-10

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  KRAUSE EDWARD A ,  LIU VINCENT ,  SHEN PAUL ,  DEROVANESSIAN HENRY

IPC: H04N1/41 ,  G06T9/00 ,  H04N7/08 ,  H04N7/081 ,  H04N7/58 ,  H04N19/00 ,  H04N21/2365 ,  H04N21/434 ,  H04N7/32 ,  H04N7/24

Abstract: A multichannel image compression system uses a plurality of encoders (10, 12 ... 14) to compress image data. A coding level command is provided to each of the encoders to specify a level of quality to be provided by each encoder. Encoded image data, provided by the encoders in response to the coding level command, is multiplexed (26) into a combined signal for transmission. The coding level command is adjusted in response to an accumulated amount of data from the combined signal, to maintain the accumulated data within a throughput capability of a communication channel (48). Although the coding level command may specify a global coding level that is the same for all of the encoders, the encoders can derive local coding levels from the global coding level to provide different encoding qualities. Decoder apparatus (30-46) is provided to recover an image from the compressed image data.

公开(公告)号：DE69131438D1

公开(公告)日：1999-08-19

申请号：DE69131438

申请日：1991-05-18

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD A ,  PAIK WOO H ,  LIU VINCENT ,  ESSERMAN JIM

IPC: H03M7/30 ,  G06T9/00 ,  H04N7/26 ,  H04N7/32 ,  H04N7/36 ,  H04N7/50

Abstract: A method and apparatus are provided for processing digital video signals for transmission in a compressed form. A set of pixel data is compressed without motion compensation to provide a first compressed video signal. The pixel data is compressed using motion compensation to provide a second compressed video signal. The data in the first and second compressed video signals is quantified. A comparison is made to determine which of the signals contains the least data. Successive sets of pixel data are sequentially compressed and quantified and the compressed video signal having the least data for each particular set is selected. The selected signals are encoded to identify them as motion compensated or non-motion compensated signals, and combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.

公开(公告)号：AT176566T

公开(公告)日：1999-02-15

申请号：AT92112592

申请日：1992-07-23

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  HEEGARD CHRIS ,  KRAUSE EDWARD A ,  HELLER JERROLD A

IPC: H03M7/30 ,  F16D13/58 ,  G06T9/00 ,  H03M7/40 ,  H03M13/23 ,  H03M13/25 ,  H03M13/27 ,  H03M13/29 ,  H04L1/00 ,  H04L27/00 ,  H04L27/32 ,  H04L27/34 ,  H04N7/015 ,  H04N7/24 ,  H04N7/26 ,  H04N7/66 ,  H04N19/00 ,  H04N21/2383 ,  H04N21/438 ,  H04N7/00

Abstract: Coded modulation schemes based on codes for QPSK modulation are directly incorporated into QAM based modulation systems, forming trellis coded QAM, to provide a practical coding structure that is both efficient in bandwidth and data reliability. Concatenated coding with QPSK based trellis coding and symbol error correcting coding is used. In an encoder (Fig. 2), an N-bit QAM constellation pattern (80) is divided into four subsets, each including N/4 symbol points of the constellation pattern. A two-bit QPSK codeword (92) is assigned to each of the four subsets (82, 84, 86, 88). A symbol to be transmitted is first encoded using an outer error correcting encoding algorithm, such as a Reed-Solomon code (12). Part of the symbol is then encoded (48) with an inner code that comprises a rate 1/2 trellis encoding algorithm to provide a QPSK codeword, which is mapped (50) with the remaining bits of the symbol to provide a modulation function, wherein the remaining bits (94) correlate the symbol with one of the symbol points included in the subset defined by the QPSK codeword. At a receiver (Fig. 3), the recovered modulation function is pruned (62) to provide a set of metrics (66) corresponding to the subsets and to provide a plurality of conditional determinations of the constellation point identified by the remaining bits. The metrics are used in a rate 1/2 trellis decoder (68) to recover a first bit that is encoded using a rate 1/2 encoding algorithm to recreate the QPSK codeword. One of a plurality of the conditional determinations is selected in response to the recreated codeword. The selected conditional determination is combined with the recovered first bit to provide a decoded output that is further decoded using a symbol error correcting algorithm such as a Reed-Solomon code (36).

公开(公告)号：NO302210B1

公开(公告)日：1998-02-02

申请号：NO924822

申请日：1992-12-14

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  KRAUSE EDWARD A ,  LIU VINCENT ,  SHEN PAUL ,  DEROVANESSIAN HENRY

IPC: H04N1/41 ,  G06T9/00 ,  H04N7/08 ,  H04N7/081 ,  H04N7/58 ,  H04N19/00 ,  H04N21/2365 ,  H04N21/434 ,  H04N7/26

Abstract: A multichannel image compression system uses a plurality of encoders (10, 12 ... 14) to compress image data. A coding level command is provided to each of the encoders to specify a level of quality to be provided by each encoder. Encoded image data, provided by the encoders in response to the coding level command, is multiplexed (26) into a combined signal for transmission. The coding level command is adjusted in response to an accumulated amount of data from the combined signal, to maintain the accumulated data within a throughput capability of a communication channel (48). Although the coding level command may specify a global coding level that is the same for all of the encoders, the encoders can derive local coding levels from the global coding level to provide different encoding qualities. Decoder apparatus (30-46) is provided to recover an image from the compressed image data.

公开(公告)号：AU684141B2

公开(公告)日：1997-12-04

申请号：AU1628095

申请日：1995-04-05

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD A

IPC: H04N7/32 ,  G06T7/20 ,  G06T9/00 ,  H04N7/26 ,  H04N7/36 ,  H04N7/46 ,  H04N7/50 ,  H04N7/48 ,  H04N7/64

Abstract: A method and apparatus are provided for motion compensated coding of interlaced digital video signals. A first prediction error signal is obtained (74) indicative of the difference between a current portion from a field of a current video frame and a similarly situated first portion in the same field of a prior video frame. A second prediction error signal is obtained (76) indicative of the difference between the current portion and a similarly situated second portion in an opposite field of the prior video frame. A third prediction error signal is obtained (78) indicative of the difference between the current portion and an average of the first and second portions. One of the first, second and third prediction error signals is selected (80) to represent the current portion. Motion vector information is provided (72) to enable the current frame portion to which the selected prediction error signal corresponds to be reproduced by a decoder (Fig. 10).

公开(公告)号：AU1628095A

公开(公告)日：1995-10-19

申请号：AU1628095

申请日：1995-04-05

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD A

IPC: H04N7/32 ,  G06T7/20 ,  G06T9/00 ,  H04N7/26 ,  H04N7/36 ,  H04N7/46 ,  H04N7/50 ,  H04N7/48 ,  H04N7/64

Abstract: A method and apparatus are provided for motion compensated coding of interlaced digital video signals. A first prediction error signal is obtained (74) indicative of the difference between a current portion from a field of a current video frame and a similarly situated first portion in the same field of a prior video frame. A second prediction error signal is obtained (76) indicative of the difference between the current portion and a similarly situated second portion in an opposite field of the prior video frame. A third prediction error signal is obtained (78) indicative of the difference between the current portion and an average of the first and second portions. One of the first, second and third prediction error signals is selected (80) to represent the current portion. Motion vector information is provided (72) to enable the current frame portion to which the selected prediction error signal corresponds to be reproduced by a decoder (Fig. 10).

公开(公告)号：NO950678A

公开(公告)日：1995-10-12

申请号：NO950678

申请日：1995-02-23

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD A

IPC: H04N7/32 ,  G06T7/20 ,  G06T9/00 ,  H04N7/26 ,  H04N7/36 ,  H04N7/46 ,  H04N7/50

CPC classification number: H04N19/577 ,  G06T7/223 ,  G06T2207/10016 ,  H04N19/105 ,  H04N19/112 ,  H04N19/137 ,  H04N19/42 ,  H04N19/503 ,  H04N19/61

公开(公告)号：AU663671B2

公开(公告)日：1995-10-12

申请号：AU5770894

申请日：1994-03-09

Applicant: GEN INSTRUMENT CORP

Inventor： WU ALLEN ,  KRAUSE EDWARD A ,  PAIK WOO H

IPC: H04N7/30 ,  G06T9/00 ,  H03M7/30 ,  H04N7/26 ,  H04N7/32 ,  H04N7/36 ,  H04N7/50 ,  H04N7/13

Abstract: Digital video signals are adaptively compressed for communication to a receiver. Superblocks (230), each containing a plurality of blocks (232) of digital video data, are compressed using PCM, DPCM with a general motion vector for the entire superblock, and DPCM with a specific motion vector for each block contained within a superblock. The result of each compression mode is compared (58) after accounting for overhead data, to determine which results in the least amount of data for each block (232). These blocks are assembled into a superblock (230), and compared (80) together with necessary overhead and motion vector data to the same superblock processed using all PCM as well as the superblock processed using all DPCM. The comparison determines which compression mode produces the least amount of data for the superblock. The most compact superblock is selected for transmission. The transmitted superblocks are decoded by a decoder (Fig. 5) that recovers the necessary motion vectors and overhead information which identifies the type of compression used to provide the superblock.