Volume 5 Issue 1
Feb.  2012
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TAO Li, WANG Jue, ZOU Yong-ning, WU Li-fen, WANG Hui-qian. Improved Zernike moment method for industrial CT image edge detection[J]. Chinese Optics, 2012, 5(1): 48-56. doi: 10.3788/CO.20120501.0048
Citation: TAO Li, WANG Jue, ZOU Yong-ning, WU Li-fen, WANG Hui-qian. Improved Zernike moment method for industrial CT image edge detection[J]. Chinese Optics, 2012, 5(1): 48-56. doi: 10.3788/CO.20120501.0048

Improved Zernike moment method for industrial CT image edge detection

doi: 10.3788/CO.20120501.0048
  • Received Date: 21 Sep 2011
  • Rev Recd Date: 23 Nov 2011
  • Publish Date: 10 Feb 2012
  • In order to improve the detecting speed and accuracy of sub-pixel edges for an Industrial Computed Tomography(ICT) image, a kind of improved edge detecting method based on Zernike moments is studied. First, the Sobel edge operator is used to quickly detect all the possible edges of the image, and then the Zernike moment operator is taken to re-test all the possible edges. Finally, the exact positions of the sub-pixel edges can be detected and calculated. As the possible edges have been detected and the detection range is reduced, the computing amount is shortened and the operation speed is imporved. An experiment is performed on CT images, and the result shows that the absolute error for the accuracy is less than 0.24 pixel,while Zernike moment operator computing speed is increased by about 70%, which ensures the accuracy of edge detection and improves the speed of edge detection.

     

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