摘要
提出一种数学模型描述成像系统的稳定程度。通过分析证明 :当目标物体为黑白分辨率标板 (只有两种亮度且为周期性结构 )时 ,成像系统的不稳定对成像结果的影响是使图像的像素灰度值按照二项分布的规律分布 ,因此可以用统计参量来反映成像系统的运动速率 ,进而表征图像的不稳定度。为了研究在不同时刻图像稳定性的变化规律 ,引入了统计学中表征数据离散程度的参量“标准偏差”作为描述因子。通过实验 ,直观地描述了一个佩肯棱镜系统的稳像过程 ,得出了变化曲线。曲线的波动与所观察到的图像稳定度的变化相符 。
A mathematical model, which describes stability of imaging system, is provided. While objects consist of two kinds of brightness and have periodic structure, it is proved, that intensity of pixel on image sensor of unstable image system accords binomial distribution. So image statistical parameter can be applied to describe system velocity and image instability. In order to research the rule of image stabilization at different times, the standard deviation, which indicates discrete degree of data in statistics, is introduced as descriptive factor. Finally, the curve, which described transformation process of Pechan prism system, is given. The fluctuation of the curve is in accordance with the stability change of observed image. This conclusion proves the provided method is reasonable and effective.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2004年第3期427-430,共4页
Acta Optica Sinica
