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2 results about "Gamma correction" patented technology

Gamma correction, or often simply gamma, is a nonlinear operation used to encode and decode luminance or tristimulus values in video or still image systems. Gamma correction is, in the simplest cases, defined by the following power-law expression: Vₒᵤₜ=AVᵢₙγ where the non-negative real input value Vᵢₙ is raised to the power γ and multiplied by the constant A, to get the output value Vₒᵤₜ. In the common case of A = 1, inputs and outputs are typically in the range 0–1.

Display specific image processing in an integrated circuit

ActiveUS20060208960A1Cathode-ray tube indicatorsFixed-functionImaging processing
An image processing circuit, such as a graphics accelerator chip or any other suitable circuit, includes display output control logic that is operative to receive a current frame of information from a frame buffer and is operative to process a current frame, such as by providing gamma correction, image scaling, graphics or video overlaying, or other suitable processing, to produce a processed current display frame and stores the processed current display frame back in the frame buffer. Fixed function or dedicated, display type specific temporal processing logic receives the processed current display frame stored in the frame buffer and also obtains at least one previous processed current display frame from the frame buffer and temporally processes pixels from each of the processed current display frame and the previous processed current display frame to produce a temporally compensated display frame for a specific type of display.
Owner:ATI TECH INC
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