Volume 4 Issue 6
Dec.  2011
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FENG Xiao-yong, ZHAO Zhong-hua, LIU Xin-ming. Video image processing of real-time star detection in daylight[J]. Chinese Optics, 2011, 4(6): 622-628.
Citation: FENG Xiao-yong, ZHAO Zhong-hua, LIU Xin-ming. Video image processing of real-time star detection in daylight[J]. Chinese Optics, 2011, 4(6): 622-628.

Video image processing of real-time star detection in daylight

  • Received Date: 17 Sep 2011
  • Rev Recd Date: 08 Nov 2011
  • Publish Date: 25 Dec 2011
  • To keep an inertial navigation system to correct its course errors continuously, a detection method is presented to solve the problem that few stars can be detected in daylight by the shipboard optical measuring equipment. The detecting method for the star body in daytime with strong background is studied. The median filter technology is used to improve the Signal to Noise Ratio(SNR) of an image, and the fuzzy entropy threshold method is used to creat its membership function and select the threshold of a gray-level image to detect star objects in daytime. The experimental result shows that the optical measuring equipment can improve the detecting ability from 3 MV to 4.5 MV and the amount of stars from 5 to 250 or more by this method. It meets the requirement of the inertial navigation system for correcting its course errors continuously. The method can be popularized and can be applied to the fields of dark and small target detection by televisions.

     

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