Yong Ge^{1, 2}, Qiuming Cheng²

1 State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences & Natural Resources Research, Chinese Academy of Sciences, A 11 Datun Rd., Beijing 100101, China. Tel: 8610 64888967; Fax: 8610 64889630.

2 Department of Earth and Space Science and Engineering, York University, 4700 Keele St., Toronto, ON, Canada, M3J 1P3.

Abstract:

The abrupt boundary truncation of an image may cause bright strips on a 2-D power spectrum in frequency domain and distortion of patterns in the frequency domain. The traditional solutions, including zero-padding and extension of the image by mirroring the data inside image, are useable for processing relatively simple, regular and stationary images. These methods, however, are not effective for dealing with images with holes or highly irregular shapes. This paper proposes an algorithm of using decay functions to handle boundary effects especially when filtering operation is involved in image processing. To validate the algorithm, we first employ a geochemical image interpolated by data set from a mineral district in Nova Scotia, Canada to analyze the effects of decay function on boundary truncations with the change of extension width. We then apply the algorithm to a real-life remotely sensed image. It is demonstrated that decay functions give superior overall performances over the traditional method.

Keywords:  Boundary effect; Decay functions; Image processing.

(Full Paper 2 MB)

Biographies:

Yong Ge was born on October 28, 1972 in P.R.China. She received the B.S. degree on surveying and mapping from Wuhan University, Wuhan, PRC, in 1995, the M.S. degree in geographical information system from the Wuhan university, Wuhan, PRC, in 1998, and the Ph.D. degree in cartography and geographical information system from Chinese Academy of Sciences in 2001. Since July 2001, she has been with the State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences where she is currently associate professor.

Qiuming Cheng was born on March 15, 1960 in P.R.China. He received the Ph.D. degree in earth science from University of Ottawa, Canada, in 1994. He is currently Professor in Department of Earth and Atmospheric Science and Department of Geography, York University, Canada and served as Director of CFI Geomatics Research Lab in York University. He is the recipient for a numbers of prestigious awards including President Prize by International Association for Mathematical Geology (IAMG), 1995; Canada Foundation for Innovation Researcher (CFI), 1998; Ontario Primer Research Excellent Award (PREA), 2000; and Foreign Researcher by Japan Society for the Promotion of Science (JSPS), 2002. He has served as Associate Editor, Computers & Geosciences, Editorial Board Member of Mathematical Geology, Geochemistry: Exploration, Environment and Analysis, Int. Journal of Ocean and Oceanography, Journal of Geophysics Progress and Journal of Earth Science, Fellow of Geological Association of Canada/Mineralogy Association of Canada (GAC), Fellow of International Association of Applied Geochemist (AEG), Council Member of International Association for Mathematical Geology (IAMG) Member, European Geological Union (EGU) and Member of America Geophysical Union (AGU).

BibTex:

@ARTICLE{P1150724002,

AUTHOR = {Yong Ge and  Qiuming Cheng},

TITLE = {Boundary effect reduction in image filtering},

JOURNAL ={ICGST International Journal on Graphics, Vision and Image Processing, GVIP},

YEAR = {2007},

VOLUME = {07},

ISSUE ={II},

PAGES={17--25}

}

(Full Paper 2 MB),