As a result, a prediction vector generation method, an image encoding method, and an image decoding method, etc., that achieve excellent coding efficiency are provided.
An image encoding method capable of improving encoding efficiency, an image encoding device, an image decoding method, an image decoding device, and an image encoding/decoding device are provided.
It is possible to realize an image decoding device and an image decoding method capable of performing decoding processing in a short time and accurately with a simple configuration.
A moving image decoding method for decoding coded data relating to an image divided into a plurality of blocks comprises: determining a predicted motion vector for the motion vector of a block to be decoded using motion vector information that is stored in a storage unit and includes the motion vectors of decoded blocks and reference destination information indicating the destinations to which the motion vectors refer; controlling the decoding processing of the motion vector that uses the predicted motion vector according to whether or not the reference destination information relating to the motion vector of the block to be decoded indicates an inter-view reference image; and decoding the motion vector of the block to be decoded by the controlled decoding processing.
Provided are a moving image encoding device, a moving image decoding device, a moving image encoding method, a moving image decoding method, and a program, capable of improving encoding performance.
There is provided an image decoding method for decoding a picture to be decoded by referencing an appropriate picture even when random access reproduction is performed.
An image decoding apparatus and an image decoding method wherein a decoded image can be produced even in a case of requiring, as a reference pixel, a pixel of a block for which a intra-prediction mode, which is specified in a stream by erroneous transmission, an error of an encoding method or the like, cannot be used in terms of specification.
In order to provide an image coding method and an image decoding method which are capable of improving subjective image quality and coding efficiency by using a closer decoded pixel in intra-prediction processing, an intra-prediction coding method comprises: a step for setting a reference pixel signal from a decoded pixel signal in intra-prediction in which a prediction signal is generated in the same screen; a step for acquiring a prediction mode identification information for identifying an intra-prediction mode; a step for generating the prediction signal on the basis of the reference pixel signal and the prediction mode identification information; a step for performing a determination for correcting the prediction signal using a reference pixel having a shorter distance between a pixel to be predicted and the reference pixel in the intra-prediction mode specified by the prediction mode identification information; and a step for correcting the generated prediction signal according to the result of the determination.
Provided is an image decoding method that decodes, for each block, image data included in an encoded stream, and that comprises the following steps: a derivation step for deriving candidates for intra-prediction modes of which there are always at least two, the candidates being intra-prediction mode candidates used for intra-screen prediction of a decoding subject block; an acquisition step for acquiring an index from the encoded stream in order to specify one candidate from the derived intra-prediction mode candidates; a selection step for selecting on the basis of the acquired index one candidate, from the derived intra-prediction mode candidates, as the intra-prediction mode used for intra-screen prediction of a decoding subject block.
A moving image decoding apparatus and moving image decoding method wherein the picture quality degradation is small even when an error occurs in decoding or the like in an encoding system that refers to a plurality of frames to perform a prediction encoding.
In the image decoding device and the image decoding method for performing decoding processing based on a predetermined encoding method, during a high-speed reproduction mode, a simple reproduction frame extracted consists of an I picture at a desired position in the image data encoded by the encoding method, as a reference and a predetermined number of P pictures following it.
This image decoding method includes: a restoration step that restores a selected prediction mode that is the prediction mode used in predicting the time of encoding; and a decoding step that generates a decoded block by decoding a target block of encoded image data in accordance with the prediction based on the selected prediction mode.
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