Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
  • H04N1/41—Bandwidth or redundancy reduction

Definitions

• the present invention relates to an apparatus and method for compressing
• Formatting a document as a PDF file means that the document can be
• Color information is identified for the text in the text layers. Color information may
• the two layers can be compressed and
• FIG. 2 is a diagram conceptually illustrating text layers and bodies of text each having a uniform color in the text layers;
• FIG. 3 is a diagram illustrating an exemplary text layer of FIG. 2 along with a
• FIG. 5 is a flow chart of a method for execution by the computer system for formatting a document using a two layer format.
• Embodiments consistent with the present invention divide an image into, for
• Each region is separated into two layers, a layer of text within the region and a layer of non-text information. Both layers have the same size as the
• bit value “ 1 " means that the pixel is a text pixel and bit value "0" means the pixel is not a text pixel; different values can alternatively be used.
• the color of the text can be represented by, for
• the non-text layer is represented by, for example, a two-dimensional matrix that uses
• R, G, B values is known in the art and includes the use of three
• a first byte specifies the value of the color red for
• a second byte specifies the value of the color green for the pixel
• Each byte specifies the value of the color blue for the pixel.
• Each byte having eight bits,
• FIG. 1 is a diagram conceptually illustrating a two layer format for a document
• regions 24, 26, and 28 based upon colors of bodies of text. All of the text in region 24, in this example, has the same color.
• the regions each define a physical space within the document
• Region 24 has a
• region 26 has a text layer 16 and a non-text layer
• region 28 has a text layer 20 and a non-text layer 22.
• Each text layer is a text layer 22 and a non-text layer 22.
• text layer represents the image or non-text information within, for example, the same
• Regions 24, 26, and 28 are shown conceptually in FIG. 1 and the illustrated layers are not necessarily
• Bodies of text having the same color are used to define the physical space for each region. This feature maintains the color information for the
• FIG. 2 is a diagram
• Document 30 includes various regions 31, 32, 33, 34, and 35
• FIG. 3 is a diagram illustrating the relation between
• An exemplary text layer 36 has a corresponding non-text
• the other text layers can have different dimensions
• non-text layers can exist in one of the regions or span multiple regions. Color values
• System 40 can include
• Network 54 represents any type
• wireline or wireless network can be used, for example, to transmit formatted
• Computer system 40 typically includes a memory 52, a processor 42, an input device 50, a display device 44, a printer 48, a
• Memory 52 may include random access memory (RAM) or similar types of RAM
• memory may store one or more applications for execution by processor 42.
• Secondary storage device 56 may include a hard disk drive, floppy disk drive, CD-
• Processor 42 may execute instructions stored in ROM drive, or other types of non- volatile data storage.
• Processor 42 may execute instructions stored in ROM drive, or other types of non- volatile data storage.
• computer system 40 such as a keyboard, key pad, cursor-
• Scanner 46 may include any device for converting a hard copy of information into an
• Computer system 40 can also include output devices such as
• computer-readable media may include instructions for controlling computer system 40
• a document can be scanned into memory 52 using
• a non-text layer is then created by, for example, excluding all text pixels
• This segmentation can be accomplished by a number of
• a first region contains the first
• region information is updated to include the new character. If the new character is not
• the color information can be specified
• the layers in the regions can be compressed (step 68). Since
• lossless compression is the G4 compression method, and an example of
• JPEG Joint Photographic Experts Group
• the compressed layers can be output to a file (step 70).
• the file can be stored,
• An XObject is created for the text layer

Landscapes

• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Compression Of Band Width Or Redundancy In Fax (AREA)
• Image Processing (AREA)
• Facsimile Image Signal Circuits (AREA)
• Color Image Communication Systems (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

Family

ID=25100169

Family Applications (1)

Country Status (6)

Cited By (7)

Families Citing this family (16)

Family Cites Families (12)

• 2001
  • 2001-01-31 US US09/774,074 patent/US7145676B2/en not_active Expired - Lifetime
  • 2001-08-24 TW TW090120945A patent/TW522737B/zh not_active IP Right Cessation
• 2002
  • 2002-01-23 JP JP2002562074A patent/JP4463476B2/ja not_active Expired - Fee Related
  • 2002-01-23 GB GB0317737A patent/GB2390257B/en not_active Expired - Fee Related
  • 2002-01-23 DE DE10295968T patent/DE10295968T5/de not_active Withdrawn
  • 2002-01-23 WO PCT/US2002/002060 patent/WO2002062050A2/en not_active Ceased

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