Image decoding device and image decoding method

Abstract

Improve encoding efficiency. [Problem-solving solution] An image decoding device that decodes signals encoded by dividing frames constituting a moving image into blocks comprises: a prediction unit that generates a block-unit predicted image including a predicted signal by performing signal prediction for each pixel signal in block units; an acquisition unit that acquires a control identification signal indicating the type of selection control selected by the encoding side; a filter processing unit that generates a new block of predicted image by applying a filter process to the predicted signal using decoded adjacent signals adjacent to the block of the predicted image based on the control identification signal; an inverse quantization unit that restores a conversion coefficient signal by applying a corresponding inverse quantization process to the quantized conversion coefficients; and an inverse conversion unit that reconstructs a block-unit predicted residual signal by applying an inverse conversion process determined based on the control identification signal to the conversion coefficient signal.

Claims

1. An image decoding device that decodes signals encoded by dividing frames constituting a moving image into blocks, A prediction unit generates a block-unit predicted image containing the predicted signal by performing signal prediction for each pixel signal in block units, A filter processing unit generates a new block of predicted image by applying a filter to the predicted signal of the block of predicted image using the decoded adjacent signal adjacent to the block of predicted image, The system includes an inverse transform selection application unit that selectively applies multiple types of inverse transform processes corresponding to the subblock division to the transformation coefficients of the predicted residual signal, which has been subblock-divided on the image encoding side, in order to generate subblocks of the predicted residual signal. Image decoding device.

2. An image decoding method that decodes a signal encoded by dividing the frames constituting a moving image into blocks, The process involves generating a block-based predicted image containing the predicted signal by performing signal prediction for each pixel signal in a block-based manner, and The steps include generating a new block of predicted image by applying a filter to the predicted signal of the block of predicted image using the decoded adjacent signal adjacent to the block of predicted image, The method comprises the steps of: selectively applying multiple types of inverse transformation processes corresponding to the subblock division to the transformation coefficients of the predicted residual signal, which has been subblock-divided on the image coding side, in order to generate subblocks of the predicted residual signal. Image decoding method.

Images