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《Optics and Precision Engineering》 2019-04
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Video enhancement method for low-speed dim targets based on high signal-to-background ratio

ZHANG Liu;ZHANG Hao-chen;LIU Fu-cheng;MAN Yi-yun;SUN Jun;ZHANG Guan-yu;College of Instrumentation & Electrical Engineering,Jilin University;Shanghai Aerospace Control Technology Institute;Qian Xuesen Laboratory of Space Technology;  
Previous studies have used signal-to-background ratio in spectroscopy to address the lack of physical quantities that describe target signal saliency in image processing.Similar to the signal-tonoise ratio calculation method,the ratio of the average gray value of the target signal to the average gray value of the background was obtained,therefore,the contrast between the target signal and the background was visually demonstrated.However,a video enhancement method was proposed for low-speed dim targets to distinguish and detect low-speed dim targets in videos.First,a smooth differential image was obtained by overlying the image sequences at the beginning and end of the video to distinguish between them.Then,an image with a high signal-to-background ratio was obtained by gray transformation iteration.Experimental results have shown that,the target signal saliency was effectively described by the signal-to-background ratio.Using the video enhancement method for lowspeed dim targets,the signal-to-noise ratio of the target signal increased from 1.84 to 9.18,and the signal-to-background ratio increased from 0.33 to 19.44,which is approximately 60 times higher.The saliency of the low-speed dim target signal in the video has significantly improved,thus fulfilling the requirements for low-speed dim targets.
【Fund】: 科技部重点研发计划资助项目(No.2016YFB0501003);; 上海科学技术委员会重点项目资助(No.16DZ1120400);; 国家自然科学基金资助项目(No.51705187);; 中国博士后科学基金资助项目(No.2017M621202);; 上海航天科技创新基金资助项目(No.SAST2018-046)
【CateGory Index】: TP391.41
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