Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (8): 80101-080101.doi: 10.11889/j.0253-3219.2019.hjs.42.080101


Application of Laplace enhancement in spot position measurement offluorescent screen imaging

Yongxiang HUA1,2,Peirong GONG1,3()   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
  • Received:2019-03-29 Revised:2019-06-03 Online:2019-08-10 Published:2019-08-26
  • Contact: Peirong GONG
  • About author:HUA Yongxiang, male, born in 1990, graduated from Qingdao University of Technology in 2014, master student, major in electronics and communication engineering
  • Supported by:
    National Key R&D Program of China "Research on XFEL Principle & Key Technologies"(2016YFA0401901)

Abstract: Background

Fluorescence screen detector is an important spot position measuring device. The position of the spot is mainly measured by the fluorescent screen image. However, due to the dispersion of the spot, the edge of the spot in the image becomes blurred, which will affect the position measurement.


This study aims to improve the accuracy of spot position measurement.


The Laplacian operator was used to enhance the fluorescent screen image, and then the threshold segmentation method was applied to finding the edge position of the spot. Accuracy comparison of this approach with canny edge detection algorithm was performed on a real fluorescent spot image.


Test results show that this method can be used to accurately locate the spot position from fluorescent image with better accuracy compared with canny algorithm.


Laplace enhancement can be applied to improving position measurement resolution of fluorescence screen detector.

Key words: Synchrotron radiation, Fluorescence screen, Image processing, Laplace enhancement

CLC Number: 

  • TL814,TP751