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Fixed point integer division techniques for AC/DC prediction in video coding devices

  • US 7,895,250 B2
  • Filed: 05/25/2005
  • Issued: 02/22/2011
  • Est. Priority Date: 05/25/2005
  • Status: Active Grant
First Claim
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1. A coding device comprising:

  • a memory storing a lookup table (LUT) having entries generated as an inverse function of an index B, wherein the index B defines a range of values that includes every DC scalar value and every quantization parameter associated with a coding standard; and

    a fixed point calculation unit that performs a fixed point calculation of a floating point operation (A // B) for coding according to the coding standard based on values A, B1 and B2, wherein B1 and B2 comprise high and low portions of a selected entry of the LUT, wherein A // B represents integer division of A divided by B rounded to a nearest integer, andwherein the entries of the LUT are generated according to one of;


    floor(2^31/B)+1wherein floor represents an operation for rounding down to an integer.

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