Image encoding device, image decoding device, and program thereof
An image encoding device 1 of the present disclosure includes a neighboring pixel non-reference predictor 11 configured to generate a predicted image by a predetermined neighboring pixel non-reference prediction for each pixel signal of an original image in a block unit, a filter processor 12 configured to perform a low-pass filter process on a prediction signal located at a boundary of a block of the predicted image by using a decoded neighboring signal neighboring to the predicted image under a predetermined control, a prediction residual signal generator 55 configured to generate a prediction residual signal of the block unit by using the predicted image, an orthogonal transformer 14 configured to perform an orthogonal transformation process on the prediction residual signal of the block unit under the predetermined control, and an orthogonal transformation selection controller 25 configured to control the filter processor 12 and the orthogonal transformer 14 and generate a predetermined transformation type identification signal. An image decoding device 5 of the present disclosure performs a decoding process based on a transformation type identification signal at the time of the predetermined neighboring pixel non-reference prediction.
1 . An image encoding device for block-dividing and encoding an original image of a frame unit constituting a moving image, the image encoding device comprising:
a predictor circuit configured to generate a predicted image of a block unit including a prediction signal by predetermined prediction that performs signal prediction for each pixel signal of the original image 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;
a prediction residual signal generator circuit configured to calculate an error of each prediction signal of the block of the predicted image after the filter process for each pixel signal of an encoding target block of the original image, and to generate a prediction residual signal of a block unit; and
a transformer circuit including:
a sub-block divider circuit configured to divide the prediction residual signal of the block unit; and
a transformation selection applier circuit configured to selectively apply a plurality of types of transformation processes for each divided sub-block of the prediction residual signal according to the sub-block division.
2 . The image encoding device according to claim 1 , wherein the predetermined prediction includes any one of an inter prediction, an intra block copy prediction, and a cross component signal prediction.
3 . 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.
4 . 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.