Evaluation of the effect of equal power spectrum filtering in image restoration

NTSC-IR

	Evaluation of the effect of equal power spectrum filtering in image restoration
	Yang, XH ; Zheng, XW
	2001-10-01
发表期刊	CHINESE ASTRONOMY AND ASTROPHYSICS
ISSN	0275-1062
卷号	25 期号:4 页码:506-514
摘要	The effectiveness of equal power spectrum filtering in image restoration is analyzed via digital simulation. We start with a gray-scale map of concentric rings with different grey values. To obtain a dirty image, the original image is first transformed via a linear space-invariant system. Then, white noise is mixed into the image. The equal power spectrum filter is then used for the image restoration. The signal to noise ratio (SNR) and a defined steepness of the steps, together with the visual impression, are accepted to characterize the performance of the image restoration. It is concluded that a satisfactory restoration can be realized when the SNR > 15. When SNR < 5, the image is completely un-restorable. The effect of system's transfer function on image restoration is also discussed. The effectiveness of the presented model of equal power spectrum filter is confirmed by applying it to the restoration of an actual astronomical image. Finally, a typical application of the equal power spectrum filter is given.
关键词	image restoration equal power spectrum filter white noise
语种	英语
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
WOS记录号	WOS:000172661300014
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/10989
专题	中国科学院国家授时中心
通讯作者	Yang, XH
作者单位	1.Chinese Acad Sci, Shaanxi Observ, Lintong 710600, Peoples R China 2.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Yang, XH,Zheng, XW. Evaluation of the effect of equal power spectrum filtering in image restoration[J]. CHINESE ASTRONOMY AND ASTROPHYSICS,2001,25(4):506-514.
APA	Yang, XH,&Zheng, XW.(2001).Evaluation of the effect of equal power spectrum filtering in image restoration.CHINESE ASTRONOMY AND ASTROPHYSICS,25(4),506-514.
MLA	Yang, XH,et al."Evaluation of the effect of equal power spectrum filtering in image restoration".CHINESE ASTRONOMY AND ASTROPHYSICS 25.4(2001):506-514.