Invention Grant
- Patent Title: Deringing filter for video coding
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Application No.: US16338640Application Date: 2017-07-11
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Publication No.: US11272175B2Publication Date: 2022-03-08
- Inventor: Ying Wang , Kenneth Andersson , Jacob Ström , Per Wennersten
- Applicant: Telefonaktiebolaget LM Ericsson (publ)
- Applicant Address: SE Stockholm
- Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee Address: SE Stockholm
- Agency: Murphy, Bilak & Homiller, PLLC
- International Application: PCT/SE2017/050776 WO 20170711
- International Announcement: WO2018/067051 WO 20180412
- Main IPC: H04N19/117
- IPC: H04N19/117 ; H04N19/122 ; H04N19/124 ; H04N19/159 ; H04N19/176 ; H04N19/182

Abstract:
A pixel value of a pixel in a picture of a video sequence is modified by a weighted combination of the pixel value and at least one spatially neighboring pixel value in a filtering. The filtering depends on a pixel distance between the pixel and a neighboring pixel and on a pixel value difference between the pixel and a neighboring pixel value of the neighboring pixel. The filtering is controlled by a spatial parameter and a range parameter. At least one of the spatial parameter and the range parameter depends on at least one of a quantization parameter, a quantization scaling matrix, a transform width, a transform height, a picture width, a picture height and a magnitude of a negative filter coefficient used as part of inter/intra prediction. The embodiments provide a deringing filtering to combat ringing artifacts during video coding.
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