公开(公告)号：CA2084178A1

公开(公告)日：1993-06-25

申请号：CA2084178

申请日：1992-11-30

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

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：CA2082133A1

公开(公告)日：1993-05-20

申请号：CA2082133

申请日：1992-11-04

Applicant: GEN INSTRUMENT CORP

Inventor： SHEN PAUL ,  PAIK WOO H ,  KRAUSE EDWARD A

IPC: H03M7/00 ,  G06T1/60 ,  G11C7/10 ,  H04N5/907 ,  H04N7/26 ,  H04N7/32 ,  H04N7/36 ,  H04N7/50

Abstract: A multiple serial access memory is provided. A dynamic random access memory (30) is addressed to input data thereto and output data therefrom. Rows of data are output from the array (50) in response to address signals (34, 36, 38) provided thereto. A plurality of serial output ports (44, 46, 48) is coupled to the output of the array for selectively latching different rows of data output from the array. The serial output ports (44, 46, 48) are clocked to output the latched data therefrom. In an illustrated embodiment, each of the serial output ports contains a shift register (62, 64, 66, ... 68) having a length equal to the width of the memory array (30). The shift register is responsive to a first timing signal (42, 52) for latching a row of data from the array (30). A second timing signal actuates the shift register to shift a row of latched data. A serial access selector (70) coupled to the shift register outputs a selected portion of the shifted data from the serial output port. The memory has particular application as the frame store for a motion compensated interframe image coding/decoding system.

公开(公告)号：MX9206693A

公开(公告)日：1993-05-01

申请号：MX9206693

申请日：1992-11-19

Applicant: GEN INSTRUMENT CORP

Inventor： SHEN PAUL ,  PAIK WOO H ,  KRAUSE EDWARD A

IPC: H03M7/00 ,  G06T1/60 ,  G11C7/10 ,  H04N5/907 ,  H04N7/26 ,  H04N7/32 ,  H04N7/36 ,  H04N7/50 ,  G05B19/00

Abstract: A multiple serial access memory is provided. A dynamic random access memory (30) is addressed to input data thereto and output data therefrom. Rows of data are output from the array (50) in response to address signals (34, 36, 38) provided thereto. A plurality of serial output ports (44, 46, 48) is coupled to the output of the array for selectively latching different rows of data output from the array. The serial output ports (44, 46, 48) are clocked to output the latched data therefrom. In an illustrated embodiment, each of the serial output ports contains a shift register (62, 64, 66, ... 68) having a length equal to the width of the memory array (30). The shift register is responsive to a first timing signal (42, 52) for latching a row of data from the array (30). A second timing signal actuates the shift register to shift a row of latched data. A serial access selector (70) coupled to the shift register outputs a selected portion of the shifted data from the serial output port. The memory has particular application as the frame store for a motion compensated interframe image coding/decoding system.

公开(公告)号：AU8788891A

公开(公告)日：1992-05-21

申请号：AU8788891

申请日：1991-11-14

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD ,  PAIK WOO H ,  LIU VINCENT C ,  HELLER JERROLD A ,  SHEN PAUL ,  ESSERMAN JAMES NEIL

IPC: G06T9/00 ,  H04N7/26 ,  H04N7/36 ,  H04N7/50 ,  H04N11/04 ,  H04N7/137

Abstract: An image area is refreshed during the transmission of a set of motion compensated sequential video images. The video images are divided into a plurality of adjacent regions. The image area is refreshed during a refresh cycle by communicating a different region in each successive video image of the set without motion compensation. Motion compensation of the previously refreshed regions of the image area during the refresh cycle is restricted to an area containing only the previously refreshed regions. Video image data from a current region being refreshed is encoded for use by a decoder in identifying it as non-motion compensated data.

公开(公告)号：NO914318L

公开(公告)日：1992-05-18

申请号：NO914318

申请日：1991-11-04

Applicant: GEN INSTRUMENT CORP

Inventor： KRAUSE EDWARD ,  PAIK WOO H ,  LIU VINCENT C ,  HELLER JERROLD A ,  SHEN PAUL ,  ESSERMAN JAMES NEIL

IPC: G06T9/00 ,  H04N7/26 ,  H04N7/36 ,  H04N7/50 ,  H04N11/04 ,  H04N7/137

Abstract: An image area is refreshed during the transmission of a set of motion compensated sequential video images. The video images are divided into a plurality of adjacent regions. The image area is refreshed during a refresh cycle by communicating a different region in each successive video image of the set without motion compensation. Motion compensation of the previously refreshed regions of the image area during the refresh cycle is restricted to an area containing only the previously refreshed regions. Video image data from a current region being refreshed is encoded for use by a decoder in identifying it as non-motion compensated data.

公开(公告)号：NO920516D0

公开(公告)日：1992-02-10

申请号：NO920516

申请日：1992-02-10

Applicant: GEN INSTRUMENT CORP

Inventor： SHEN PAUL ,  KRAUSE EDWARD A ,  PAIK WOO H

IPC: H03M7/30 ,  G06T9/00 ,  H04N7/60 ,  H04N11/04 ,  H04N19/00 ,  H04N21/236 ,  H04N21/434 ,  H04N

Abstract: Digital video signals are processed by a plurality of independently operating processors (42, 44, 46, 48) to provide data for transmission in a compressed, motion compensated form. A video image frame area (10) is divided into a set of subframes (12, 16, 20, 24). The set of subframes is systematically shifted such that the individual subframes progressively cycle across and wrap around the video image frame area. For each successive video frame, video image data bounded by each of the different subframes is independently compressed using motion estimation to reduce data redundancy among the successive frames. The motion estimation is limited for each subframe of a current video frame to areas of a previous video frame that were bounded by the same subframe in the previous frame. In an illustrated embodiment, the set of subframes (12, 16, 20, 24) is shifted once for each successive video frame, and each subframe includes a refresh region (14, 18, 22, 26) whereby the video image frame area (10) is progressively refreshed as the subframes are shifted thereacross. Receiver apparatus (60-82) for use in decoding the independently processed subframe data is also disclosed.

公开(公告)号：DE69333714D1

公开(公告)日：2005-01-05

申请号：DE69333714

申请日：1993-03-16

Applicant: GEN INSTRUMENT CORP

Inventor： POLLMANN STEPHEN C ,  KRAUSE EDWARD A ,  SHEN PAUL ,  PAIK WOO H ,  MORONEY PAUL

IPC: H03M7/40 ,  G06T9/00 ,  H03M7/42 ,  H04N7/26 ,  H04N7/30 ,  H03M7/30

Abstract: Apparatus (10) is provided for decoding variable length code words to recover transform coefficients, such as DCT transform coefficients provided by a high definition television encoder. A first category of the code words has a length of no more than n bits. A second category has a length of greater than n bits. A feedback ROM (22) is used to decode the code words. Code words from the first category are processed by directly addressing a lookup table (80) in the ROM (22). Code words from the second category are processed using multiple passes through the ROM (22), wherein a portion of the data output during a prior pass is fed back (90) to address the memory during a subsequent pass.

公开(公告)号：DE69232623T2

公开(公告)日：2003-02-06

申请号：DE69232623

申请日：1992-10-31

Applicant: GEN INSTRUMENT CORP

Inventor： SHEN PAUL ,  PAIK WOO H ,  KRAUSE EDWARD A

IPC: H03M7/00 ,  G06T1/60 ,  G11C7/10 ,  H04N5/907 ,  H04N7/26 ,  H04N7/32 ,  H04N7/36 ,  H04N7/50

Abstract: A multiple serial access memory is provided. A dynamic random access memory (30) is addressed to input data thereto and output data therefrom. Rows of data are output from the array (50) in response to address signals (34, 36, 38) provided thereto. A plurality of serial output ports (44, 46, 48) is coupled to the output of the array for selectively latching different rows of data output from the array. The serial output ports (44, 46, 48) are clocked to output the latched data therefrom. In an illustrated embodiment, each of the serial output ports contains a shift register (62, 64, 66, ... 68) having a length equal to the width of the memory array (30). The shift register is responsive to a first timing signal (42, 52) for latching a row of data from the array (30). A second timing signal actuates the shift register to shift a row of latched data. A serial access selector (70) coupled to the shift register outputs a selected portion of the shifted data from the serial output port. The memory has particular application as the frame store for a motion compensated interframe image coding/decoding system.

公开(公告)号：DE69229773T2

公开(公告)日：2000-03-02

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：DE69325969T2

公开(公告)日：2000-02-17

申请号：DE69325969

申请日：1993-11-11

Applicant: GEN INSTRUMENT CORP

Inventor： SHEN PAUL ,  KRAUSE EDWARD A ,  TOM ADAM

IPC: H03M7/40 ,  G06T9/00 ,  H03M7/42 ,  H04L1/00 ,  H04N1/41 ,  H04N19/89 ,  H04N7/32 ,  H04N7/24 ,  H04N7/30

Abstract: A method and apparatus are provided for decoding variable length codewords carried in data blocks. A first buffer is loaded with a succession of data blocks. A second buffer is loaded with a first data block from the first buffer during a decoding cycle. The variable length codewords from the first data block in the second buffer are decoded to recover information. The process continues, with the second buffer being loaded with one data block at a time to successively decode new data blocks during successive decoding cycles.