Image decoding device, image decoding method, and integrated circuit

An image decoding method designed to decode a coded stream which has been coded by performing coding processing on the basis of a coding unit,

• each said coding unit being comprised of:
• one or more prediction units functioning as units of prediction processing;
• or one or more transform units functioning as units of frequency transform processing,
• the coding processing including:
• prediction processing to be performed on the one or more prediction units;
• and frequency transform processing to be performed on the one or more transform units,
• the method comprising the steps of:
• dividing, if the size of each said prediction unit is greater than a predetermined size, the prediction unit into a plurality of blocks irrespective of the size of each said transform unit;
• generating a predicted image of the prediction unit by performing decoding processing on the predicted image on the basis of each of the plurality of blocks obtained by dividing the prediction unit;
• and
• obtaining a restored image based on the predicted image generated in the step of generating the predicted image.

An integrated circuit for decoding a coded stream which has been coded by performing coding processing on the basis of a coding unit,

• each said coding unit being comprised of:
• one or more prediction units functioning as units of prediction processing;
• or one or more transform units functioning as units of frequency transform processing,
• the coding processing including:
• prediction processing to be performed on the one or more prediction units;
• and frequency transform processing to be performed on the one or more transform units,
• the integrated circuit comprising:
• a divider dividing, if the size of each said prediction unit is greater than a predetermined size, the prediction unit into a plurality of blocks irrespective of the size of each said transform unit;
• a predicted image generator generating a predicted image of the prediction unit by performing decoding processing on the predicted image on the basis of each of the plurality of blocks obtained by dividing the prediction unit;
• and
• an image restorer obtaining a restored image based on the predicted image generated by the predicted image generator.