Chin-Hsiang Luo 1, Chung-Shin Yuan2, Che-Yen Wen3, Jiun-Jian Liaw4, Shih-Hsuan Chiu4

  • 1 Department of Environmental Engineering, Hung-Kuang University, 34, Chung-Chie Road, Taichung, Taiwan, R.O.C.
  • 2 Institute of Environmental Engineering, National Sun Yat-Sen University, 70, Lien-Hai Road, Kaohsiung, Taiwan, R.O.C
  • 3 Department of Forensic Science, National Central Police University, 56, Shu-Ren Road, Da-Gang, Guei-Shan, Tao-Yuan, Taiwan, R.O.C
  • 4 Department of Polymer Engineering, National Taiwan University of Science and Technology, 43, Kee-lung Road, Section 4, Taipei, Taiwan, R.O.C

Received: May 1, 2005
Revised: May 1, 2005
Accepted: May 1, 2005
Download Citation: ||  

  • Download: PDF

Cite this article:
Luo, C.H., Yuan, C.S., Wen, C.Y., Liaw, J.J. and Chiu, S.H. (2005). Investigation of Urban Atmospheric Visibility Hsing Haar Wavelet Transform. Aerosol Air Qual. Res. 5: 39-47.



A method of image processing, Haar wavelet transform, was first applied to establish a new index and provide accurate digital data to present urban atmospheric visibility, instead of the conventional observing method. Digital images of urban areas in Kaohsiung, a city at the south of Taiwan, are analyzed according to brightness (gray level). An index value for a scene image is calculated with a processor of Haar wavelet transform. As a result, a good correlation between the wavelet index values and the visual range values estimated by three trained observers is affirmed by the correlation coefficient (R2) of 0.81. Convenient transmission and the exchangeability of digital images of the real-time landscape facilitate the demonstration of the results on the web site.

Keywords: Visibility; Air quality; Wavelet transform; Image processing

Don't forget to share this article 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

Latest coronavirus research from Aerosol and Air Quality Research

2018 Impact Factor: 2.735

5-Year Impact Factor: 2.827

SCImago Journal & Country Rank

Sign up to AAQR Newsletter

Sign up to receive latest research, letters to the editors, and review articles, delivered to your inbox every second week!