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US 12,732,607 B2Granted
Image encoding/decoding method and device employing in-loop filtering
AssigneeIntellectual Discovery Co., Ltd.
InventorsSung Chang Lim, Jung Won Kang, Ha Hyun Lee, Dong San Jun, Hyun Suk Ko, Jin Ho Lee, Hui Yong Kim
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Abstract
The present invention relates to a video encoding/decoding method and apparatus. The video decoding method according to the present invention may comprise decoding filter information on a coding unit; classifying samples in the coding unit into classes on a per block classification unit basis; and filtering the coding unit having the samples classified into the classes on a per block classification unit basis by using the filter information.
Claims11
A method of decoding a video, the method comprising:
- decoding a flag, indicating whether ALF (Adaptive Loop Filter) is applied to a coding tree block or not;
- in response to the flag indicating that the ALF is applied to the coding tree block, classifying samples in the coding tree block into classes on a per block classification unit basis;
- and
- applying filtering to the samples in the coding tree block,
- wherein the block class indices are determined according to directionality information and activity information,
- wherein at least one of the directionality information and the activity information is determined on the basis of a gradient value with respect to at least one of a vertical direction, a horizontal direction, a first directional direction, and a second directional direction,
- wherein the gradient value is obtained using a one-dimensional Laplacian operation for the block classification unit,
- wherein the one-dimensional Laplacian operation is performed only for a specific sample position included in the block classification unit, and
- wherein a horizontal position and a vertical position of the specific sample are both even or both odd based on each block classification unit.
6 more elements
A method of encoding a video, the method comprising:
- classifying samples in a coding tree block into classes on a per block classification unit basis;
- applying filtering to the samples in the coding tree block;
- and
- encoding a flag, indicating whether ALF (Adaptive Loop Filter) is applied to the coding tree block or not,
- wherein the block class indices are determined according to directionality information and activity information,
- wherein at least one of the directionality information and the activity information is determined on the basis of a gradient value with respect to at least one of a vertical direction, a horizontal direction, a first directional direction, and a second directional direction,
- wherein the gradient value is obtained using a one-dimensional Laplacian operation for the block classification unit,
- wherein the one-dimensional Laplacian operation is performed only for a specific sample position included in the block classification unit, and
- wherein a horizontal position and a vertical position of the specific sample are both even or both odd based on each block classification unit.
6 more elements
A device for transmitting a bitstream, comprising:
- a processor to obtain the bitstream;
- and
- a transmitting unit to transmit the bitstream,
- wherein obtaining the bitstream comprises:
- classifying samples in a coding tree block into classes on a per block classification unit basis;
- applying filtering to the samples in the coding tree block;
- and
- encoding a flag, indicating whether ALF (Adaptive Loop Filter) is applied to the coding tree block or not,
- wherein the block class indices are determined according to directionality information and activity information,
- wherein at least one of the directionality information and the activity information is determined on the basis of a gradient value with respect to at least one of a vertical direction, a horizontal direction, a first directional direction, and a second directional direction,
- wherein the gradient value is obtained using a one-dimensional Laplacian operation for the block classification unit,
- wherein the one-dimensional Laplacian operation is performed only for a specific sample position included in the block classification unit, and
- wherein a horizontal position and a vertical position of the specific sample are both even or both odd based on each block classification unit.
10 more elements
Dependencies are inferred from the claim text.