Image encoding device, image decoding device, image encoding method, and image decoding method

摘要

A disparity vector detection unit retrieves a signal having a high correlation with an encoding target block and acquire the signal having the high correlation and a disparity vector which is a disparity in a screen of the encoding target block by using a local decoded image of a block in the same image signal which was previously encoded, with respect to the encoding target block. A disparity prediction signal generation unit generates a prediction signal in accordance with the disparity vector. The disparity vector detection unit includes a DC calculation unit operative to predict a DC component of an image signal of the encoding target block from a neighboring decoded image, and a disparity reference DC calculation unit operative to calculate a DC component of a prediction signal represented by the disparity vector.

主权项

1. An image encoding device dividing an image signal into a block constituted by a plurality of pixels and encoding the image signal by the divided block units, comprising:
a disparity vector detection unit operative to retrieve a signal having a high correlation with an encoding target block and acquire the signal having the high correlation and a disparity vector which is a disparity within a screen of the encoding target block by using a local decoded image of a block within the same image signal which has already been encoded with respect to the encoding target block; and a disparity prediction signal generation unit operative to generate a prediction signal in accordance with the disparity vector, wherein the disparity vector detection unit includes a DC calculation unit operative to predict a DC component of an image signal of the encoding target block from a neighboring decoded image, and a disparity reference DC calculation unit operative to calculate a DC component of a prediction signal represented by the disparity vector, and compensates a difference between the DC component predicted from the neighboring decoded image and the DC component of the prediction signal, adds the compensated prediction signal to a selection candidate of the prediction signal of the encoding target block, and detects an appropriate signal among the prediction signals and a disparity vector required to configure the prediction signal and information indicating whether the DC component is compensated, and the disparity prediction signal generation unit generates a prediction signal from the local decoded image in accordance with the detected disparity vector and the information indicating whether the DC component is compensated, which are detected, and encodes a difference signal between the generated prediction signal and the encoding target block which are generated, the disparity vector, and the information indicating whether the DC component is compensated.