基于光束空间展宽的水下前向散射成像模型  

Underwater forward scattering imaging model based on beam spatial broadening

作　　者：黄有为[1] 金伟其[1] 丁琨[1] 李海兰[1] 曹峰梅[1] 王霞[1] 

机构地区：[1]北京理工大学光电成像技术与系统教育部重点实验室,北京100081

出　　处：《红外与激光工程》2009年第4期669-673,701,共6页Infrared and Laser Engineering

基　　金：国家863计划资助项目(2006AA09Z207)

摘　　要：基于主动照明的水下成像技术一直是人们感兴趣的方向之一。水对光的强烈散射和衰减,尤其是多次散射效应,使水下光束传输过程变得十分复杂。为分析和仿真水下成像过程,提出了一种基于空间展宽的水下前向散射成像模型,其空间展宽采用Wells提出的调制传递函数(MTF),并考虑了介于目标与接收器之间的水体散射光对像面照度的贡献。模型弥补了Wells模型与实测结果的偏差,仿真图像与实测图像具有较好的一致性,表明了模型在水下前向散射成像仿真方面的有效性。The imaging of underwater objects that are illuminated by natural or artificial light has been one of the interested directions. The propagations of imaging light through water is complicated due to extreme attenuating and scattering properties of water, especially multiple scattering. A forward scattering model based on spatial broadening was presented to analyze and simulate the formation of underwater imaging. The MTF proposed by Wells was adopted to study the spatial broadening. It was found that the intervening water between the objects and receiver should also be regarded as a kind of light source, which brightened the entire image. Thus, the forward scattering model of water was introduced to complement the Wells＇ model based on small angle scattering. Then, the above mentioned models were programmed by Matlab. Simulated and measured images were identical.It is concluded that the forward scattering model proposed is valid for simulation of underwater images.

关 键 词：水下成像 前向散射 空间展宽 调制传递函数 

分 类 号：TN249[电子电信—物理电子学]