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Period-based bit conversion method and apparatus for digital image processing

  • US 6,292,168 B1
  • Filed: 08/13/1998
  • Issued: 09/18/2001
  • Est. Priority Date: 08/13/1998
  • Status: Expired due to Term
First Claim
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1. A period-based method of converting digital image data for a plurality of pixels from a first bit depth to a second bit depth, said method comprising:

  • a) receiving an input scanline of an arbitrary length comprising digital image data for a plurality of input image pixels, each of said plurality of input image pixels defined at a first bit depth;

    b) dividing the input scanline into a plurality of periods and a remainder with each of said plurality of periods comprising digital image data for a select number of input image pixels and said remainder comprising digital image data for less than said select number of input image pixels, said select number of input image pixels defining a period selected so that the image data for the select number of input image pixels exactly comprises m bytes when defined at the first bit depth and exactly comprises n bytes when defined at a second bit depth, wherein m and n are different integers;

    c) for each of said plurality of periods in succession, converting the image data for each of said select number of input image pixels from the first bit depth to the second bit depth; and

    , d) converting the image data defining said remainder from the first bit depth to the second bit depth.

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