Image encoding device, image decoding device, and program thereof

An image decoding device for decoding a signal encoded by block-dividing a frame constituting a moving image, the image decoding device comprising:

• a predictor circuit configured to generate a predicted image of a block unit including a prediction signal by a predetermined prediction that performs signal prediction for each pixel signal of a block unit;
• a filter processor configured to generate a block of a new predicted image by performing a filter process to a prediction signal located at a boundary of a block of the predicted image by using weighting factors and a decoded neighboring signal neighboring to the block of the predicted image;
• an inverse transformer circuit including:
• an inverse transformation selection applier circuit configured to selectively apply a plurality of types of inverse transformation processes according to a sub-block division to transformation coefficients of a prediction residual signal that has been sub-block-divided by an image encoding side, and to generate a sub-block of the prediction residual signal;
• and
• a block reconfigurer circuit configured to reconfigure a block corresponding to the block size of the predicted image based on the sub-block of the prediction residual signal.

An image decoding method for decoding a signal encoded by block-dividing a frame constituting a moving image;

• the image decoding method comprising:
• generating a predicted image of a block unit including a prediction signal by a predetermined prediction that performs signal prediction for each pixel signal of a block unit;
• generating a block of a new predicted image by performing a filter process to a prediction signal located at a boundary of a block of the predicted image by using weighting factors and a decoded neighboring signal neighboring to the block of the predicted image;
• selectively applying a plurality of types of inverse transformation processes according to a sub-block division to transformation coefficients of a prediction residual signal that has been sub-block-divided by an image encoding side;
• generating a sub-block of the prediction residual signal;
• and
• reconfiguring a block corresponding to the block size of the predicted image based on the sub-block of the prediction residual signal.