光学掩模实现几何超分辨成像的仿真

Simulation of geometric superresolution imaging by using optical mask

将基于实际CCD模型的频谱编码方法引入光电成像系统,以克服CCD对空间分辨率的限制,实现几何超分辨成像。介绍了光学掩模实现几何超分辨成像的工作原理,基于实际的CCD模型在4f成像系统的频谱面上放置光学编码掩模来提高图像分辨率。对该成像系统模型进行了数学分析,从理论上证明了这种基于实际CCD模型的频谱编码方法的有效性。根据建立的理论完成了基于一维光学编码掩模方法的仿真实验。仿真结果表明:提出的方法能实现几何超分辨成像,解决了光电成像系统中因CCD欠采样造成的物频谱混叠和因像素尺寸非零而造成的低通效应问题。与传统的超分辨方法相比,该方法的系统结构简单、易实现。

A frequency spectral coding method based on a practical CCD model was added into a photoelectronic imaging system to overcome the CCD limitation on spatial resolution and to achieve geometric superresolution imaging.The working mechanism of the geometric superresolution imaging with an optical mask was introduced.On the basis of the practical CCD model,the optical mask was placed on the Fourier transform plane of the 4f imaging system to improve the image resolution.A mathematical model of the imaging system was established and rigidly analyzed.The proposed frequency spectral coding method based on the CCD practical model was demonstrated to be validly in theory.Mathematical modeling and simulation on the proposed method in one dimensional optical mask were performed.Simulation results show that third enable to solve the spectral aliasing caused by the separations among the pixels and the low-pass effect due to the CCD nonzero pixel size.To compare with the conventional approach,this new method is much easy to implement and has a simple structure.