| 摘要 |
<p>The purpose of the invention is to reduce the amount of filter processing in a technique for improving the objective and subjective image quality of a predicted image by using an adaptive filter when generating the predicted image using a reference layer image. An image decoding device decodes hierarchically encoded data in which image information relating to images, the qualities of which differ from layer to layer, is hierarchically encoded, and reconstructs an image in a target layer to be decoded. The image decoding device comprises: a predicted image generation means for, based on prediction parameters, generating a predicted image of the target layer using, as inputs, an already decoded reference layer image and an already decoded target layer image; and a filter means for performing adaptive filter processing on the reference layer image, said adaptive filter processing being based on filter parameters, and generating a filtered reference layer image. The predicted image generation means generates a predicted image using the filtered reference layer image only when the prediction parameters satisfy a predetermined condition.</p> |
