Moving picture encoding apparatus, moving picture encoding method, moving picture encoding program, moving picture decoding apparatus, moving picture decoding method, and moving picture decoding program

A moving picture encoding apparatus comprising:

• predicted image generating means for generating a predicted image, with respect to a target image as an object to be encoded among a plurality of images constituting a moving picture;
• difference image generating means for executing a difference operation between the target image and the predicted image to generate a difference image;
• encoding means for encoding the difference image to generate an encoded difference signal;
• decoding means for decoding the encoded difference signal to generate a decoded difference image;
• reproduced image generating means for executing a sum operation of the decoded difference image and the predicted image to generate a reproduced image;
• storing means for storing a reference image to be used by the predicted image generating means in order to generate the predicted image;
• and
• image updating means for defining the reference image stored in the storing means, as a first image and defining at least one of a reference image different from the first image, stored in the storing means, the reproduced image, and the decoded difference image, as a second image, and for performing a weighted summation of the first image and at least a portion of the second image to generate an updated image,
• wherein the image updating means stores the updated image into the storing means, and
• wherein the predicted image generating means uses the updated image stored in the storing means, as the reference image for generating the predicted image.

A moving picture decoding apparatus comprising:

• decoding means for decoding an encoded difference signal resulting from predictive coding of a moving picture, to generate a decoded difference image;
• predicted image generating means for generating a predicted image with respect to a target image as an object to be decoded, based on the encoded difference signal;
• reproduced image generating means for performing a summation of the decoded difference image and the predicted image to generate a reproduced image;
• storing means for storing a reference image to be used by the predicted image generating means in order to generate the predicted image;
• and
• image updating means for performing a weighted summation of a first image which is one of the reproduced image and the reference image stored in the storing means, and at least a portion of a second image which is the other of the reproduced image and the reference image, to generate an updated image,
• wherein the image updating means stores the updated image into the storing means, and
• wherein the predicted image generating means uses the updated image stored in the storing means, as a reference image for generating a predicted image with respect to another target image.