Image encoding device, image decoding device, and program thereof
An image encoding device for block-dividing and encoding an original image of a frame unit constituting a moving image is disclosed that includes a predictor circuitry configured to generate a predicted image, a weighted average processor configured to generate a block of a new predicted image, a prediction residual signal generator circuitry configured to calculate an error of each prediction signal of the block of the predicted image and to generate a prediction residual signal, a sub-block divider circuitry configured to divide the prediction residual signal configured to divide the predict residual signal, and a transformation selection applier circuitry configured to selectively apply a plurality of types of transformation processes for a divided sub-block of the prediction residual signal.
1 . 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 circuitry configured to generate a predicted image of block unit including a prediction signal by a predetermined prediction that performs a signal prediction for each pixel signal of an original image of the block unit;
a corrector circuitry configured to
acquire a control identification signal indicating a type of transformation process selected by an encoding side,
control, based on the control identification signal, an execution and a non-execution of a modifying process on a prediction signal of a block of the predicted image, and
generate a block of a new predicted image by performing the modifying process by using a decoded neighboring signal neighboring to the block of the predicted image when executing the modifying process;
an inverse quantizer circuitry configured to reconstruct a transformation coefficient signal by performing a corresponding inverse quantization process on a transformation coefficient quantized by a predetermined quantization process as a signal encoded by block-dividing a frame constituting the moving image; and
an inverse transformer circuitry configured to reconstruct a prediction residual signal of the block unit by controlling an inverse transformation process determined based on the control identification signal with respect to the reconstructed transformation coefficient signal.
2 . 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 block unit including a prediction signal by a predetermined prediction that performs a signal prediction for each pixel signal of an original image of the block unit;
acquiring a control identification signal indicating a type of transformation process selected by an encoding side;
controlling, based on the control identification signal, an execution and a non-execution of a modifying process on a prediction signal of a block of the predicted image;
generating a block of a new predicted image by performing the modifying process by using a decoded neighboring signal neighboring to the block of the predicted image when executing the modifying process;
reconstructing a transformation coefficient signal by performing a corresponding inverse quantization process on a transformation coefficient quantized by a predetermined quantization process as a signal encoded by block-dividing a frame constituting the moving image; and
reconstructing a prediction residual signal of the block unit by controlling an inverse transformation process determined based on the control identification signal with respect to the reconstructed transformation coefficient signal.