Efficient SAO Signaling
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United States of America Patent
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Aug 22, 2017
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May 29, 2014
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Methods and systems provide efficient sample adaptive offset (SAO) signaling by reducing a number of bits consumed for signaling SAO compared with conventional methods. In an embodiment, a single flag is used if a coding unit to a first scanning direction with respect to a given coding unit is off. In an embodiment, further bits may be saved if some neighboring coding units are not present, i.e. the given coding unit is an edge. For example, a flag may be skipped, e.g., not signaled, if the given coding unit does not have a neighbor. In an embodiment, a syntax element, one or more flags may signal whether SAO filtering is performed in a coding unit. Based on the syntax element, a merge flag may be skipped to save bits. In an embodiment, SAO syntax may be signaled at a slice level.
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