CA2374389C - Lzw data compression/decompression apparatus and method with embedded run-length encoding/decoding - Google Patents

Lzw data compression/decompression apparatus and method with embedded run-length encoding/decoding Download PDF

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Publication number
CA2374389C
CA2374389C CA002374389A CA2374389A CA2374389C CA 2374389 C CA2374389 C CA 2374389C CA 002374389 A CA002374389 A CA 002374389A CA 2374389 A CA2374389 A CA 2374389A CA 2374389 C CA2374389 C CA 2374389C
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CA
Canada
Prior art keywords
code
run
data
count
lzw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA002374389A
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English (en)
French (fr)
Other versions
CA2374389A1 (en
Inventor
Albert B. Cooper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unisys Corp
Original Assignee
Unisys Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unisys Corp filed Critical Unisys Corp
Publication of CA2374389A1 publication Critical patent/CA2374389A1/en
Application granted granted Critical
Publication of CA2374389C publication Critical patent/CA2374389C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/46—Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/005—Statistical coding, e.g. Huffman, run length coding
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3084—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction using adaptive string matching, e.g. the Lempel-Ziv method
    • H03M7/3088—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction using adaptive string matching, e.g. the Lempel-Ziv method employing the use of a dictionary, e.g. LZ78

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
CA002374389A 1999-06-19 2000-06-15 Lzw data compression/decompression apparatus and method with embedded run-length encoding/decoding Expired - Fee Related CA2374389C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/336,219 US6169499B1 (en) 1999-06-19 1999-06-19 LZW data compression/decompression apparatus and method with embedded run-length encoding/decoding
US09/336,219 1999-06-19
PCT/US2000/016509 WO2000079687A1 (en) 1999-06-19 2000-06-15 Lzw data compression/decompression apparatus and method with embedded run-length encoding/decoding

Publications (2)

Publication Number Publication Date
CA2374389A1 CA2374389A1 (en) 2000-12-28
CA2374389C true CA2374389C (en) 2005-09-20

Family

ID=23315088

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002374389A Expired - Fee Related CA2374389C (en) 1999-06-19 2000-06-15 Lzw data compression/decompression apparatus and method with embedded run-length encoding/decoding

Country Status (7)

Country Link
US (1) US6169499B1 (enExample)
EP (1) EP1195010B1 (enExample)
JP (1) JP2003502930A (enExample)
AU (1) AU5874900A (enExample)
CA (1) CA2374389C (enExample)
DE (1) DE60009502T2 (enExample)
WO (1) WO2000079687A1 (enExample)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6216175B1 (en) * 1998-06-08 2001-04-10 Microsoft Corporation Method for upgrading copies of an original file with same update data after normalizing differences between copies created during respective original installations
US6624761B2 (en) 1998-12-11 2003-09-23 Realtime Data, Llc Content independent data compression method and system
US6601104B1 (en) 1999-03-11 2003-07-29 Realtime Data Llc System and methods for accelerated data storage and retrieval
US6188333B1 (en) * 1999-08-12 2001-02-13 Unisys Corporation LZW data compression apparatus and method using look-ahead mathematical run processing
GB0001707D0 (en) * 2000-01-25 2000-03-15 Btg Int Ltd Data compression having more effective compression
US6748457B2 (en) 2000-02-03 2004-06-08 Realtime Data, Llc Data storewidth accelerator
US6307488B1 (en) * 2000-05-04 2001-10-23 Unisys Corporation LZW data compression and decompression apparatus and method using grouped data characters to reduce dictionary accesses
US6968012B1 (en) 2000-10-02 2005-11-22 Firepad, Inc. Methods for encoding digital video for decoding on low performance devices
US9143546B2 (en) 2000-10-03 2015-09-22 Realtime Data Llc System and method for data feed acceleration and encryption
US8692695B2 (en) 2000-10-03 2014-04-08 Realtime Data, Llc Methods for encoding and decoding data
US7386046B2 (en) 2001-02-13 2008-06-10 Realtime Data Llc Bandwidth sensitive data compression and decompression
US6426711B1 (en) * 2001-05-14 2002-07-30 Unisys Corporation Character table implemented data compression method and apparatus
US20030088537A1 (en) * 2001-08-08 2003-05-08 Nec Eluminant Technologies, Inc. High speed data compression and decompression apparatus and method
US6466144B1 (en) * 2001-11-30 2002-10-15 Unisys Corporation Data decompressor for use with a data compressor implemented with limited length character tables and compact string codes
KR100532275B1 (ko) * 2002-12-11 2005-11-29 삼성전자주식회사 이미지 압축방법
US6756923B1 (en) * 2003-05-30 2004-06-29 Unisys Corporation Data compressor utilizing switched input coincidence elements arranged in virtual levels
CN106549672B (zh) * 2016-10-31 2019-07-12 合肥移顺信息技术有限公司 一种加速度传感器的三轴数据压缩方法
CN109857463B (zh) * 2019-01-30 2020-12-01 上海兆芯集成电路有限公司 加速压缩方法以及加速压缩装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558302A (en) 1983-06-20 1985-12-10 Sperry Corporation High speed data compression and decompression apparatus and method
US4929946A (en) 1989-02-09 1990-05-29 Storage Technology Corporation Adaptive data compression apparatus including run length encoding for a tape drive system
US4971407A (en) 1989-08-09 1990-11-20 Unisys Corp. Two stage run and string data compressor providing doubly compressed output
US4988998A (en) 1989-09-05 1991-01-29 Storage Technology Corporation Data compression system for successively applying at least two data compression methods to an input data stream
US5247638A (en) 1990-06-18 1993-09-21 Storage Technology Corporation Apparatus for compressing data in a dynamically mapped virtual data storage subsystem
US5389922A (en) 1993-04-13 1995-02-14 Hewlett-Packard Company Compression using small dictionaries with applications to network packets
GB2301252A (en) * 1995-05-23 1996-11-27 Ibm Run length data compression
US5861827A (en) 1996-07-24 1999-01-19 Unisys Corporation Data compression and decompression system with immediate dictionary updating interleaved with string search

Also Published As

Publication number Publication date
US6169499B1 (en) 2001-01-02
EP1195010B1 (en) 2004-03-31
JP2003502930A (ja) 2003-01-21
DE60009502D1 (de) 2004-05-06
EP1195010A1 (en) 2002-04-10
DE60009502T2 (de) 2005-04-14
AU5874900A (en) 2001-01-09
CA2374389A1 (en) 2000-12-28
WO2000079687A1 (en) 2000-12-28

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Effective date: 20140617