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	Spatial filtering method for fringe patterns based on gray gradient - art. no. 63570F
	Zhang Mingzhao ; Wang Boxiong ; Luo Xiuzhi ; Yu Chao ; Hu Baiqing
	2010-05-10 ; 2010-05-10 ; OCT 13-15, 2006
会议名称	Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence, Pts 1 and 2 ; 6th International Symposium on Instrumentation and Control Technology ; Beijing, PEOPLES R CHINA ; Web of Science
关键词	image denoise fringe pattern spatial filtering gray gradient MEDIAN FILTER Computer Science, Artificial Intelligence Engineering, Electrical & Electronic Instruments & Instrumentation Optics Imaging Science & Photographic Technology
中文摘要	Traditional spatial filtering methods such as median filtering and mean filtering are widely used to remove additive noise in images. Images smoothed using these methods are inevitably blurred. If images are fringe patterns and filtering mask used is in fixed shape, such as a rectangle of m x n pixels, the structures of the pattern processed may be even deformed. To resolve this problem, a filtering method with varying mask based on gray gradient is proposed. This method makes full use of the feature of fringe patterns in that the gradient of gray level at a pixel is normal to the tangential direction of the fringe there. According to the method, gradient vector at a pixel is calculated first, and then the shape of the filtering mask to be used is determined based on the gradient vector. If its amplitude is smaller than a predefined value, a n x n square mask is used, on the other hand, if its amplitude is larger than the predefined value, a bar mask normal to the vector is used. Finally, the median value or mean value of the pixels in the mask is then achieved as the smoothed value of the pixel. After the same operations are applied to all pixels in the pattern sequentially, the smoothed version of the fringe pattern is achieved. A simulated fringe pattern with noise is smoothed using this method and other filtering methods for comparison, and the result shows that noise in the fringe pattern can be effectively removed and the characteristic details of the fringes can be reserved at the same time.
会议录出版者	SPIE-INT SOC OPTICAL ENGINEERING ; BELLINGHAM ; 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/19386]
专题	清华大学
推荐引用方式 GB/T 7714	Zhang Mingzhao,Wang Boxiong,Luo Xiuzhi,et al. Spatial filtering method for fringe patterns based on gray gradient - art. no. 63570F[C]. 见:Signal Analysis, Measurement Theory, Photo-Electronic Technology, and Artificial Intelligence, Pts 1 and 2, 6th International Symposium on Instrumentation and Control Technology, Beijing, PEOPLES R CHINA, Web of Science.

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