无扫描激光三维成像系统的建模与仿真  

Modeling and simulation for scannerless laser 3D imaging system

作　　者：潘华东[1] 谢斌[1] 刘济林[1] 

机构地区：[1]浙江大学信息与通信工程研究所,浙江省综合信息网技术重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2010年第4期639-644,651,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(60302013)

摘　　要：当前的像增强器耦合型CCD(ICCD)模型主要针对微光成像系统,无法直接用于三维成像系统.在三维成像系统中,像增强器不再工作于高增益状态,而且增益非线性对测量结果有很大影响.为此,改进ICCD模型中的噪声模型,采用非线性增益模型.针对光源强度和像增强器增益均随时间变化,对模型进行时间离散化处理.结合光照模型和物体三维数据进行系统仿真和定量分析.结果表明,增加CCD势阱容量、减小微通道板(MCP)增益、增大光源功率,可以提高信噪比,从而提高测量精度,同时需要提高快门速度、光源调制度,并抑制环境光影响.Present intensified CCD （ICCD） model which mainly for low-light imaging system is not suitable for the 3D imaging system.Image intensifiers operate with low gain,different from the low-light imaging system,and the gain nonlinearity has a great effect on results.An improved ICCD noise model was proposed,and a nonlinear gain model was used.As the light is cosine modulated and the gain of the image intensifiers changes over time,the model is modified as time-discrete.The system was simulated and analyzed quantitatively together with the illumination model and the objects 3D data.The results show that increasing CCD well capacity,reducing microchannel plate （MCP） gain and increasing light power,lead to increased SNR （signal-to-noise ratio） and improve the measurement accuracy.Additionally,very narrow shutter,high light modulation depth and high suppression of ambient light should be implemented.

关 键 词：无扫描三维成像 时间行程法 ICCD 

分 类 号：TN958.8[电子电信—信号与信息处理]