Wavelet power spectrum-based autofocusing algorithm for time delayed and integration charge coupled device space camera

	Wavelet power spectrum-based autofocusing algorithm for time delayed and integration charge coupled device space camera
其他题名	论文其他题名
	Tao S. P.; Jin G.; Zhang X. Y.; Qu H. S.; An Y.
	2012
发表期刊	Applied Optics
ISSN	1559-128X
卷号	51 期号:21 页码:5216-5223
摘要	A novel autofocusing algorithm using the directional wavelet power spectrum is proposed for time delayed and integration charge coupled device (TDI CCD) space cameras, which overcomes the difficulty of focus measure for the real-time change of imaging scenes. Using the multiresolution and band-pass characteristics of wavelet transform to improve the power spectrum based on fast Fourier transform (FFT), the wavelet power spectrum is less sensitive to the variance of scenes. Moreover, the new focus measure can effectively eliminate the impact of image motion mismatching by the directional selection. We test the proposed method's performance on synthetic images as well as a real ground experiment for one TDI CCD prototype camera, and compare it with the focus measure based on the existing FFT spectrum. The simulation results show that the new focus measure can effectively express the defocused states for the real remote sensing images. The error ratio is only 0.112, while the prevalent algorithm based on the FFT spectrum is as high as 0.4. Compared with the FFT-based method, the proposed algorithm performs at a high reliability in the real imaging experiments, where it reduces the instability from 0.600 to 0.161. Two experimental results demonstrate that the proposed algorithm has the characteristics of good monotonicity, high sensitivity, and accuracy. The new algorithm can satisfy the autofocusing requirements for TDI CCD space cameras. (C) 2012 Optical Society of America
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/25559
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Tao S. P.,Jin G.,Zhang X. Y.,et al. Wavelet power spectrum-based autofocusing algorithm for time delayed and integration charge coupled device space camera[J]. Applied Optics,2012,51(21):5216-5223.
APA	Tao S. P.,Jin G.,Zhang X. Y.,Qu H. S.,&An Y..(2012).Wavelet power spectrum-based autofocusing algorithm for time delayed and integration charge coupled device space camera.Applied Optics,51(21),5216-5223.
MLA	Tao S. P.,et al."Wavelet power spectrum-based autofocusing algorithm for time delayed and integration charge coupled device space camera".Applied Optics 51.21(2012):5216-5223.

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