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Why is film grain in the decoder not an allowed feature?

April 26, 2017allowed decoder feature Film grain

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Why is film grain in the decoder not an allowed feature?

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Actually, it is allowed if we have an integrated grain solution, where grain is parametrized and stored on the encoding side, and then decoded on the decoding side. But if we’re talking about just adding random noise, I feel this would falsify the results of a comparison.