Image coding apparatusa and method
AssigneeCanon Kabushiki Kaisha
InventorSatoru Kobayashi
Life of this patent
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Abstract
An image coding apparatus includes an image characteristic determination unit configured to divide input image data into image blocks each including a plurality of pixels, and to determine a characteristic of each image block, a loop filter configured to perform a filtering process on each image block in a locally decoded image associated with the input image, and a control unit configured to control a property of the loop filter to perform a filtering process on image regions into which the image blocks are sorted according to characteristics of the image blocks determined by the image characteristic determination unit.
Claims13
An image coding apparatus comprising:
- a determination unit configured to divide input image data into image blocks each including a plurality of pixels, and to determine a characteristic of each image block;
- a filter configured to perform a filtering process on each image block in a locally decoded image associated with the input image data;
- and
- a control unit configured to control a property of the filter unit to perform a filtering process on image regions into which the image blocks are sorted according to characteristics of the image blocks determined by the determination unit.
An image coding apparatus comprising:
- a determination unit configured to divide input image data into image blocks each including a plurality of pixels, and to determine a characteristic of each image block by detecting at least an AC component of the image block;
- a slice construction unit configured to construct at least one slice including one or more of the image blocks, an AC component detected by the determination unit of which is equal to or greater than a predetermined threshold value;
- a filter unit configured to perform a filtering process on each image block in a locally decoded image associated with the input image data;
- and
- a control unit configured to control the filter unit to perform the filtering process on an image block corresponding to the slice constructed by the slice construction unit at a lower strength than a strength at which the filtering process is performed on another image block.
An image coding method comprising:
- a determination step of dividing input image data into image blocks each including a plurality of pixels, and determining a characteristic of each image block;
- a filtering step of performing a filtering process on each image block in a locally decoded image associated with the input image data;
- and
- a control step of controlling a property of the filtering step when a filtering process is performed on image regions into which the image blocks are sorted according to characteristics of the image blocks determined in the determination step.
An image coding method comprising:
- a determination step of dividing input image data into image blocks each including a plurality of pixels, and determining a characteristic of each image block by detecting at least AC components of the image block;
- a slice construction step of constructing at least one slice including one or more of the image blocks, an AC component detected in the determination step of which is equal to or greater than a predetermined threshold value;
- a filtering step of performing a filtering process on each image block in a locally decoded image associated with the input image data;
- and
- a control step of controlling the filtering step to perform a filtering process on an image block corresponding to the slice constructed in the slice construction step at a lower strength than a strength at which the filtering process is performed on another image block.
Dependencies are inferred from the claim text.