Patent ID: 7463684

Claim:
In a computer system, a computer-implemented method comprising: for each of plural predicted video frames encoded using motion compensation: detecting whether or not a global luminance change occurs in the predicted video frame relative to a reference video frame; determining a value of a global luminance change compensation on/off signal for the predicted video frame, wherein the value depends on whether global luminance change compensation is used for the predicted video frame; and signaling, in an output bitstream, the value for the global luminance change compensation on/off signal at frame level for the predicted video frame; and separate from the global luminance change compensation on/off signal for the predicted video frame, selectively signaling, in the output bitstream, values of global luminance change parameters for the predicted video frame, including: if the value of the global luminance change compensation on/off signal for the predicted video frame indicates that global luminance change compensation is on for the predicted video frame, signaling the values of global luminance change parameters for the predicted video frame; and if the value of the global luminance change compensation on/off signal for the predicted video frame indicates that global luminance change compensation is off for the predicted video frame, skipping the signaling of the values of global luminance change parameters for the predicted video frame.