Image decoding device and image encoding device
AssigneeSharp Kabushiki Kaisha
InventorsYOSHIYA YAMAMOTO, TOMOHIRO IKAI
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Abstract
It is an object to provide an image decoding device and an image encoding device that can achieve high coding efficiency with a low throughput. An image decoding device (31) includes a block parameter deriver (5211) configured to derive a block index by referring to a pixel value of an unfiltered decoded image in a target unit area, and a filter processor (525) configured to perform adaptive filter processing on the unfiltered decoded image in the target unit area, by using a filter coefficient in accordance with the block index.
Claims13
An image decoding device that generates an unfiltered decoded image by referring to a residual image and a prediction image and generates a decoded image by applying an in-loop filter to the unfiltered decoded image, the device comprising:
- a block index deriver configured to derive a block index by referring to a pixel value of the unfiltered decoded image in a target unit area;
- a filter index deriver configured to derive a filter index by referring to the block index;
- and
- a filter processor configured to apply the in-loop filter to the unfiltered decoded image in the target unit area, by using a filter coefficient determined in accordance with the filter index.
An image decoding device that generates an unfiltered decoded image by referring to a residual image and a prediction image and generates a decoded image by applying an in-loop filter to the unfiltered decoded image, the device comprising:
- a category index determination unit configured to determine a category index for indicating a deriving method for a block index for each unit area;
- a block index deriver configured to derive the block index in accordance with the deriving method indicated by the category index;
- a filter index deriver configured to derive a filter index by referring to the block index;
- and
- a filter processor configured to apply the in-loop filter to the unfiltered decoded image in a target unit area by using a filter coefficient determined in accordance with the filter index.
An image decoding device that generates an unfiltered decoded image by referring to a residual image and a prediction image and generates a decoded image by applying an in-loop filter to the unfiltered decoded image, the device comprising:
- a category index deriver configured to derive a category index for each unit area;
- a filter index deriver configured to derive a filter index by referring to the category index;
- a filter processor configured to apply the in-loop filter to the unfiltered decoded image in a target unit area by using a filter coefficient determined in accordance with the filter index;
- and
- a filter coefficient storage configured to store the filter coefficient in any of a plurality of buffers in accordance with the category index.
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Dependencies are inferred from the claim text.