GB2427784A - JPEG Encoding For Document Images Using Pixel Classification - Google Patents

JPEG Encoding For Document Images Using Pixel Classification Download PDF

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Publication number
GB2427784A
GB2427784A GB0614544A GB0614544A GB2427784A GB 2427784 A GB2427784 A GB 2427784A GB 0614544 A GB0614544 A GB 0614544A GB 0614544 A GB0614544 A GB 0614544A GB 2427784 A GB2427784 A GB 2427784A
Authority
GB
United Kingdom
Prior art keywords
jpeg encoding
document images
pixel classification
classification
block
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.)
Withdrawn
Application number
GB0614544A
Other versions
GB0614544D0 (en
Inventor
Mohamed N Ahmed
Brian E Cooper
Michael E Lhamon
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.)
Lexmark International Inc
Original Assignee
Lexmark International Inc
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 Lexmark International Inc filed Critical Lexmark International Inc
Priority claimed from PCT/US2004/043694 external-priority patent/WO2005064938A1/en
Publication of GB0614544D0 publication Critical patent/GB0614544D0/en
Publication of GB2427784A publication Critical patent/GB2427784A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/02—Colour television systems with bandwidth reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/04—Colour television systems using pulse code modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/136—Incoming video signal characteristics or properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H04N7/26085—
    • H04N7/26122—
    • H04N7/26244—
    • H04N7/3027—

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Processing (AREA)

Abstract

The invention provides a system and method for JPEG encoding an image that includes variable quantization (50) for each block, depending upon the classification of each block (30), which is dependent on the classification of pixels (20) in that block.

Description

GB 2427784 A continuation (74) Agent and/or Address for Service: Frank B
Dehn & Co. St. Bride's House, 10 Salisbury Square, LONDON, EC4Y 8JD, United Kingdom
GB0614544A 2003-12-23 2004-12-22 JPEG Encoding For Document Images Using Pixel Classification Withdrawn GB2427784A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US77488403A 2003-12-23 2003-12-23
PCT/US2004/043694 WO2005064938A1 (en) 2003-12-23 2004-12-22 Jpeg encoding for document images using pixel classification

Publications (2)

Publication Number Publication Date
GB0614544D0 GB0614544D0 (en) 2006-08-30
GB2427784A true GB2427784A (en) 2007-01-03

Family

ID=34740168

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0614544A Withdrawn GB2427784A (en) 2003-12-23 2004-12-22 JPEG Encoding For Document Images Using Pixel Classification

Country Status (1)

Country Link
GB (1) GB2427784A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5886790A (en) * 1995-07-12 1999-03-23 Asahi Kogaku Kogyo Kabushiki Kaisha Image processing device
US6252994B1 (en) * 1998-01-26 2001-06-26 Xerox Corporation Adaptive quantization compatible with the JPEG baseline sequential mode

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5886790A (en) * 1995-07-12 1999-03-23 Asahi Kogaku Kogyo Kabushiki Kaisha Image processing device
US6252994B1 (en) * 1998-01-26 2001-06-26 Xerox Corporation Adaptive quantization compatible with the JPEG baseline sequential mode

Also Published As

Publication number Publication date
GB0614544D0 (en) 2006-08-30

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)