| 摘要 |
<p>The present invention pertains to an encoding device, an encoding method, a decoding device, and a decoding method, whereby it is possible to appropriately carry out a sign data hiding process. An orthogonal transformation unit orthogonally transforms the difference between an image to be encoded and a prediction image and generates an orthogonal transform coefficient. A sign hiding encoding unit carries out a sign data hiding process on the orthogonal transform coefficients on the basis of the sum of the absolute values of the non-zero orthogonal transform coefficients among the orthogonal transform coefficients generated by means of the orthogonal transformation unit, the sign data hiding process being a process for correcting the non-zero orthogonal transform coefficients such that the sign of the lead non-zero orthogonal transform coefficient is deleted and the parity of the sum of the absolute values of the non-zero orthogonal transform coefficients become a parity corresponding to the sign. The present invention can be applied, for example, to an encoding device.</p> |
