Arbitrary power function using logarithm lookup table
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United States of America Patent
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Jun 7, 2011
Grant Date -
Jul 31, 2008
app pub date -
Jan 25, 2007
filing date -
Jan 25, 2007
priority date (Note) -
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Abstract
A display device performs the fractional part of gamma translation by using a logarithm lookup table. The logarithm of an image data value is found in a look-up table. The retrieved result is multiplied by the fractional portion of the power, and a search in the look up table for this product produces an index related to the desired result. In another embodiment, rather than a search of the first look up table, a second inverse logarithm look up table is used to produce the desired result by looking up the exponentiation of the product.
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