Fading estimation/compensation
First Claim
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1. 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.
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Abstract
Techniques and tools for performing fading estimation and compensation in video processing applications are described. For example, a video encoder performs fading compensation on one or more reference images to encode images in which fading is detected. A video decoder performs corresponding fading compensation on the one or more reference images.
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Citations
13 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a computer system, a computer-implemented method comprising:
for each of plural predicted video frames encoded using motion compensation; receiving information at frame level of an encoded video bitstream, wherein the information comprises a value of a global luminance change compensation on/off signal for the predicted video frame; determining whether global luminance change compensation is on or off for the predicted video frame based upon the global luminance change compensation on/off signal for the predicted video frame; separate from the global luminance change compensation on/off signal for the predicted video frame, selectively receiving values of global luminance change parameters for the predicted video frame at frame level of the encoded video bitstream, 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, receiving 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 receiving the values of global luminance change parameters for the predicted video frame; and if the global luminance change compensation is on for the predicted video frame, performing the global luminance change compensation for the predicted video frame. - View Dependent Claims (9, 10, 11, 12, 13)
Specification