离焦对光测影响的初步研究

分析离焦产生机理,并通过实验的方法,定量地分析离焦对光测的影响.有助于解决在进行大视场测量时,特别是对大视场内的运动目标位置进行测昔时,在什么位置标定既方便又不影响测量精度的难题.     

基于小波融合的车牌模糊图像复原算法

为了更有效的实现交通信息采集,提出了一种基于小波融合的车牌图像超分辨率方法.首先分析了低分辨率图像的降质原因,主要降质因素包括:图像的形变、模糊和欠采样,根据这些降质因素建立了降质模型,分析降质模型,得出本文方法的理论模型.然后针对交通图像的特点,对形变、模糊和欠采样3个问题进行探讨,得出主要参数的估计方法.并对小波融...     

Parameter Estimation for Blur Image Combining Defocus and Motion Blur using Cepstrum Analysis

The degraded parameters recognition is very important for the restoration of blurred images. There are two common types of blurs for most camera systems. One is the defocus blur due to the optical system's defocus phenomenon and the other is the motion blur due to the relative movement between the objectives and the camera. Compared with the recognition for the blurred image with only one blur model, the parameter estimation for the picture combining defocus and motion blur models is a more complicated mission. A method was proposed for computer to estimate the parameters of defocus blur and motion blur in cepstrum area simultaneously. According to characters of both blur models in the frequency domain, an adjustment approach was suggested in the frequency area and then convert to the cepstrum field to increase the accuracy of measurement.     

基于空间光学调制的离焦探测技术研究

本文提出一种基于空间光学调制的离焦探测新方法,利用PZT驱动变形镜对会聚光束进行调制,再经相关检波获得离焦信息。该技术具有测量快速、准确、探测动态范围大等优点。