| CPC H04N 19/11 (2014.11) [H04N 19/105 (2014.11); H04N 19/176 (2014.11); H04N 19/182 (2014.11); H04N 19/593 (2014.11); H04N 19/159 (2014.11)] | 2 Claims |
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2. An image decoding method for decoding an encoded image, the image decoding method comprising:
generating a prediction image by a plurality of types of predicted image generating processing, the plurality of types of predicted image generating processing include an intra prediction, an inter prediction, and a synthesis prediction, wherein the synthesis prediction performs by performing synthesis processing of synthesizing prediction image pixels of an intra prediction and prediction image pixels of an inter prediction, to a decoding-target block; and
generating a decoded image based on a difference image between the prediction image generated in the prediction image generation and the decoding-target block, wherein
types of the predictions that can be used in the prediction image generation include a planar prediction, an angular prediction, DC prediction, and an in-screen block copy prediction,
the synthesis processing includes weighting processing performed to the prediction image pixels of the inter prediction and the prediction image pixels of the intra prediction, and
processing states of the weighting processing includes a state of setting the smallest weighting for the prediction image pixels of the intra prediction while the type of the intra prediction is the planar prediction, and
checking processing for checking whether an available adjacent block exists immediately above the decoding-target block or not, is conducted in the weighting processing.
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