Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
2008-07-29
2008-07-29
Harrison, Chante (Department: 2628)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C345S589000, C345S600000, C345S604000
Reexamination Certificate
active
11093324
ABSTRACT:
An imaging or other sensory reproduction system efficiently converts image or other sensory data between a perceptual color space (e.g., the sRGB color space) and a physical color space (unity gamma) or other perceptual/physical sensory models that are related by an expression involving a computationally expensive exponential function. The imaging system calculates exponential functions that can be composed from computationally inexpensive operations, such as square root, square, reciprocal, as well as multiplications and/or additions and subtractions. These computationally less expensive functions are then combined, such as in a weighted and/or offset mean, summation or difference to approximate the computationally expensive exponential function. The imaging system evaluates the expression using the approximation to efficiently yield the converted image data. The efficient conversion between perceptual and physical color spaces allows operations, such as blending and anti-aliasing, to be performed in the physical color space before display of a perceptual color space image.
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Stokes Michael D.
Wilt Nicholas P.
Yuval Gideon A.
Harrison Chante
Klarquist & Sparkman, LLP
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