Image coding method and image decoding method

摘要

An image coding method for coding an input image per block to generate a coded image signal includes: predicting for each prediction unit which is an area obtained by partitioning a target block to generate a prediction image of the target block; comparing a transform unit which is an area obtained by partitioning the target block and is a processing unit for frequency transform with the prediction unit, to detect part of a boundary of the prediction unit, the boundary being located within the transform unit; performing boundary filtering on the detected part of the boundary in the generated prediction image; calculating a difference between a filtered prediction image and the input image to generate a difference image of the target block; and performing frequency transform on the difference image for each transform unit.

主权项

1. An image decoding method for decoding a coded image signal obtained by coding an image per block, the image decoding method comprising:
performing inverse transform for transform units each of which is an area obtained by partitioning a target block, to generate a decoded difference image of the target block; performing prediction process on prediction units each of which is an area obtained by partitioning the target block, to generate a prediction image of the target block; performing a boundary filtering process on a boundary of the prediction unit in the generated prediction image, when the boundary of the prediction unit is located within a transform unit, the transform unit being an area obtained by partitioning the target block and being a processing unit for frequency transform; and adding the prediction image after the filtering process and the decoded difference image to generate a decoded image of the target block.