Ringing reduction for radially restored images

Yupeng Zhang*, Toshitsugu Ueda

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    This paper demonstrates a ringing reduction method for radially restored images, whose blurred versions are produced by a spherical single lens imaging system (SSLIS) embedded in an experimental camera module. The method is capable of reducing two types of ringing: those near object edges of sharp intensity transitions inside a restored image are reduced by detecting pixel intensity differences that are higher than a threshold intensity level, and replacing the corresponding pixels from a further smoothed version of the captured image; and those around image center and four boundaries of the restored image are suppressed by nearest neighbor interpolation for the upper boundary and arc-shaped boundaries of the polar image converted from the captured image. Visual evaluation shows that both types of ringing artifact in the radially restored image are greatly suppressed by the proposed method compared to the resulting image without the ringing reduction step.

    Original languageEnglish
    Title of host publicationImaging Systems and Applications, ISA 2012
    PublisherOptical Society of American (OSA)
    ISBN (Print)1557529477, 9781557529473
    Publication statusPublished - 2012
    EventImaging Systems and Applications, ISA 2012 - Monterey, CA
    Duration: 2012 Jun 242012 Jun 28


    OtherImaging Systems and Applications, ISA 2012
    CityMonterey, CA

    ASJC Scopus subject areas

    • Computer Graphics and Computer-Aided Design
    • Computer Vision and Pattern Recognition
    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials


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