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Acta Optica Sinica, Volume. 38, Issue 8, 0815014(2018)

Automatic Extraction of Diagonal Markers Based on Template Matching and Peaks of Gradient Histogram

Gang Wang1,2、*, Zhongchen Shi1,2, Yang Shang1,2、*, and Qifeng Yu1,2、*
Author Affiliations
  • 1 College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China
  • 2 Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation, Changsha, Hunan 410073, China
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    Figures&Tables (8)
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    Figures & Tables(8)
    Results of different stages in getting candidate markers. (a) Template matching; (b) response map by NCC; (c) NCC thresholding; (d) candidate markers; (e) ordering thresholding; (f) Gaussian filtering

    Fig. 1. Results of different stages in getting candidate markers. (a) Template matching; (b) response map by NCC; (c) NCC thresholding; (d) candidate markers; (e) ordering thresholding; (f) Gaussian filtering

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    Detection graphs of diagonal lines with LSD. (a) Topography of the diagonal marker; (b) extraction results of LSD; (c) lines merging results

    Fig. 2. Detection graphs of diagonal lines with LSD. (a) Topography of the diagonal marker; (b) extraction results of LSD; (c) lines merging results

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    Oriented gradient of the diagonal marker. (a) Gradient directions; (b) histogram of original image; (c) histogram of original image rotated 45°

    Fig. 3. Oriented gradient of the diagonal marker. (a) Gradient directions; (b) histogram of original image; (c) histogram of original image rotated 45°

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    Flowchart of diagonal markers' automatic extraction method

    Fig. 4. Flowchart of diagonal markers' automatic extraction method

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    Robustness test. (a) Different illuminations; (b) different perspectives; (c) complex environment

    Fig. 5. Robustness test. (a) Different illuminations; (b) different perspectives; (c) complex environment

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    Universality test. (a) Square diagonal marker; (b) coded circular diagonal marker; (c) checkerboard

    Fig. 6. Universality test. (a) Square diagonal marker; (b) coded circular diagonal marker; (c) checkerboard

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    Results of checkerboard corner detection

    Fig. 7. Results of checkerboard corner detection

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    • Table 1. Deviations of checkerboard corner detection by two methods

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      Table 1. Deviations of checkerboard corner detection by two methods

      Image numberMaximum deviations /pixelAverage deviations /pixelDeviations ≤0.1 pixel /%
      10.31300.017099.29
      20.22230.016498.57
      30.20680.016698.57
      40.32670.019595.00
      50.27770.018298.57
      60.41730.022197.86
      70.14270.015198.57
      80.09880.0147100
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    Gang Wang, Zhongchen Shi, Yang Shang, Qifeng Yu. Automatic Extraction of Diagonal Markers Based on Template Matching and Peaks of Gradient Histogram[J]. Acta Optica Sinica, 2018, 38(8): 0815014

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    Paper Information

    Category: Machine Vision

    Received: Mar. 22, 2018

    Accepted: Apr. 18, 2018

    Published Online: Sep. 6, 2018

    The Author Email:

    DOI:10.3788/AOS201838.0815014

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology