Image properties-based adaptive filtering method and device in image coding system

  • US 10,600,156 B2
  • Filed: 02/02/2016
  • Issued: 03/24/2020
  • Est. Priority Date: 06/18/2015
  • Status: Active Grant
First Claim
Patent Images

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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