Image properties-based adaptive filtering method and device in image coding system
First Claim
1. A restoring picture filtering method performed by a video decoder, comprising:
- calculating an activity of an image of a target region of a restoring picture;
determining a directivity of the image of the target region;
selecting a particular filter within a filter set based on the activity and the directivity of the image of the target region; and
generating a filtered restoring picturebased on the selected filter,wherein a, b, c, d, e, and f represent directivity values of samples of the same row or column in order from a sample on left or top, wherein b, c, d, and e represent directivity values of the samples in the target region, and wherein a and f represent the directivity values of the peripheral samples of the target region, when the target region has a size of 4×
4, andwherein the directivity of the image of the target region that has a size of 4×
4 is calculated based on a following equation,
(c+d)*3+(b+e)*2+(a+f).
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Abstract
A restoring picture filtering method performed by a decoding device, according to the present invention, comprises the steps of: calculating the activity of an image of a target region of a restoring picture; determining the directivity of the image of the target region; selecting a particular filter within a filter set on the basis of the activity and the directivity; and performing filtering on the restoring picture on the basis of the selected filter. According to the present invention, adaptive filtering may be applied on the basis of image properties of a target block of a restoring picture, and the objective/subjective image quality of the restoring picture may be enhanced therethrough.
10 Citations
14 Claims
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1. A restoring picture filtering method performed by a video decoder, comprising:
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calculating an activity of an image of a target region of a restoring picture; determining a directivity of the image of the target region; selecting a particular filter within a filter set based on the activity and the directivity of the image of the target region; and generating a filtered restoring picturebased on the selected filter, wherein a, b, c, d, e, and f represent directivity values of samples of the same row or column in order from a sample on left or top, wherein b, c, d, and e represent directivity values of the samples in the target region, and wherein a and f represent the directivity values of the peripheral samples of the target region, when the target region has a size of 4×
4, andwherein the directivity of the image of the target region that has a size of 4×
4 is calculated based on a following equation,
(c+d)*3+(b+e)*2+(a+f). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification