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	Study of the effect of CCD camera noise on microscopic autofocus criteria functions - art. no. 635729
	Yu Chao ; Wang Boxiong ; Zheng Hanqing ; Luo Xiuzhi ; Zhang Mingzhao
	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	autofocus criteria function camera noise Computer Science, Artificial Intelligence Engineering, Electrical & Electronic Instruments & Instrumentation Optics Imaging Science & Photographic Technology
中文摘要	Passive focusing techniques, which are based on the analysis of image sequences to decide the optimal imaging plane position and moving direction for focusing, are widely used for stroboscopic autofocus system nowadays. When a CCD camera is used to get images, noise of camera may result in errors in the images, and cause the autofocus process inefficient. Thus it is necessary to study microscopic images affected by camera noises to choose the suitable autofocus method. Camera noises usually include photon noise, dark current noise, photo response non-uniformity noise and read-out noise. In our CCD camera-microscopic experiment system, a micro accelerometer is used as the measured object. To analyze the effect of camera noises, we add some camera noises to the images, and run the autofocus process. One of the key techniques for microscopic autofous is its criteria function. Criteria function curves of images are analyzed and compared, including image gradient energy function, variance function, Tennengrad function and Laplace function. Spatial Poisson distribution noises and spatial Gaussian distribution noises are added to images to simulate the camera noises with different expectations and variances. Experiment results show that the performances of these criteria functions are different with different noises added.
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/123456789/19403]
专题	清华大学
推荐引用方式 GB/T 7714	Yu Chao,Wang Boxiong,Zheng Hanqing,et al. Study of the effect of CCD camera noise on microscopic autofocus criteria functions - art. no. 635729[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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