• A method for correcting radial distortion based on verifying the planarity of specimens

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      https://www.ias.ac.in/article/fulltext/sadh/042/11/1943-1952

    • Keywords

       

      3D DIC; radial distortion; distortion correction; planarity.

    • Abstract

       

      Image distortion is inevitable when an image is captured through a lens. While the digital image measurement technique is getting popular, image distortion problem can result in significant error. A new distortion correction method is proposed in this study. The proposed method is based on the fact that a flat surface should keep flat when it is measured using three-dimensional (3D) digital image measurement technique. The 3D digital image measurement technique adopted in this research is the simplified 3D digital image correlation (DIC) method. Because radial distortion has a more noticeable influence than other types of distortions,this method deals only with radial distortion. A few experiments are carried out in this study to verify the correctness of this method and its accuracy. Both simulated data and actual image data are adopted in these experiments. The results show that this method can achieve a good accuracy. The standard deviations caused byrandom errors are about the same order as the random errors. It also shows that this method is suitable for both large and small distortion conditions

    • Author Affiliations

       

      MING-HSIANG SHIH1 SHIH-HENG TUNG2

      1. Department of Civil Engineering, National Chi-Nan University, Nantou 54561, Taiwan
      2. Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan
    • Dates

       
  • Sadhana | News

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