*NEWS*XEROX RESTORES COLOR TO B&W FAXES

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*NEWS*XEROX RESTORES COLOR TO B&W FAXES

 user 2005-11-16 at 11:27:00 am Views: 68
  • #13270

    Xerox Science Restores Color to B&W Faxes
    Color Magic: Xerox Discovers How to Return The Original Color to Black-and-White Fax Images.
    SCOTTSDALE,
    AZ, Nov. 2005 – When a colored document is faxed on a black-and-white
    machine, is the color gone for good? Not necessarily, according to
    Karen M. Braun, a Xerox Corporation imaging scientist and co-developer
    of the first way to encode documents so that the colors of the original
    image can be recovered from a print made on a black-and-white printer,
    fax or copier.
    Conference Presentation
    At the Society for Imaging
    Science and Technology’s annual Color Imaging Conference here, Braun
    and Ricardo L. deQueiroz, who’s on the faculty of the Universidade de
    Brasilia in Brazil, are describing their work in a paper called “Color
    to Gray and Back: Color Embedding into Textured Gray Images.”
    The presentation is one of six being made by Xerox researchers at the conference this week.
    Color: Gone, But Not Forgotten
    Braun
    and deQueiroz began with a common problem. When a color image is
    copied, printed or faxed on a black-and-white device, the colors are
    converted to shades of gray. Two different colors with the same
    luminance – or perceived brightness – may “map” to the same shade of
    gray, making it impossible to interpret the information the colors
    carry. When that happens on graphics like pie charts or bar charts, two
    colors will look the same and the chart loses its information value.
    While
    trying to figure out how to retain the information conveyed in color
    graphs and pictures, the researchers looked for new ways to represent
    color images in black-and-white. Their method turns each color into a
    microscopically different texture or pattern in the gray parts of an
    image. It makes it easy to identify colors with similar luminance
    value, making the pictures more pleasing and the graphs more useful.
    The
    new method also had an unexpected benefit, according to Braun. “When
    you map color to textures in this way, the textures can later be
    decoded and converted back to color,” she said.
    Thus the recipient
    of a black-and-white fax could recover the colors of the original. It
    would also allow colors to be retrieved from a printed black-and-white
    hardcopy. Xerox has applied for a patent on the technology.
    Practical Uses?
    How
    might the technology someday be used? In practice, the part of the
    algorithms that code the colors could be integrated within the software
    of a black-and-white printer so colors could be transformed to textured
    grays. The decoding part of the algorithms could be part of a
    multifunction system’s scanner, recovering the original colors so the
    document could be switched back to vivid color for display or print.
    Braun
    is part of a contingent of Xerox researchers sharing their work at the
    annual conference for color scientists. Others presenting papers and
    tutorials are Raja Bala, R. Victor Klassen, Martin Maltz, Jon McElvain,
    and J. Michael Sanchez – a group that collectively hold 88 patents in
    the areas of color control, calibration, characterization and image
    processing.