• Patent Title: No-reference banding artefact predictor
  • Application No.: US17255016
    Application Date: 2020-04-06
  • Publication No.: US11297353B2
    Publication Date: 2022-04-05
  • Inventor: Jessie LinZhengzhong Tu
  • Applicant: Google LLC
  • Applicant Address: US CA Mountain View
  • Assignee: Google LLC
  • Current Assignee: Google LLC
  • Current Assignee Address: US CA Mountain View
  • Agent Andrew R. Basile, Jr.
  • International Application: PCT/US2020/026824 WO 20200406
  • International Announcement: WO2021/206674 WO 20211014
  • Main IPC: H04N11/02
  • IPC: H04N11/02 H04N19/86 H04N19/117 H04N19/176 H04N19/40
No-reference banding artefact predictor
Abstract:
A method of measuring a banding artefact in an image includes generating a gradient profile from the image, where the gradient profile includes respective gradient magnitudes of pixels of the image; generating, using the gradient profile, a candidate banding pixel (CBP) map, where each location of the CBP map is such that a gradient magnitude of the gradient profile of a corresponding pixel of the image being greater than a first threshold and smaller than a second threshold; generating, using the CBP map, a banding edge map (BEM), where the BEM includes connected banding edges of the image; generating, using the BEM, a banding visibility map (BVM), where the BVM includes a respective banding metric for at least some pixels of the image; and generating a banding index of the image using the BVM.
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