共查询到14条相似文献,搜索用时 78 毫秒
1.
微扫描减少光电成像系统频谱混淆的数学原理及实现 总被引:9,自引:0,他引:9
光电成像系统由于欠抽样引起谱混淆,推导分析了包括均匀微扫描在内的非均匀微扫描在减少混淆贩数学原理以及与亚像素位移之间的关系,同时用计算机模拟实现了微扫描的一维和二维过程。 相似文献
2.
光电成像系统对周期目标欠抽样成偈时,由于频谱混淆将产生莫尔条纹式的赝像.介绍了利用两帧不同样频率下的混淆图像以减少莫尔赝像恢复原周期目标的双倍率方法,并给出了计算模拟结果. 相似文献
3.
4.
5.
6.
应用控光学的方法,对采样成像系统能量传递过程进行了分析,给出了采样成像系统的传递函数。供采样成像系统的分析评价及总体设计时参考。 相似文献
7.
用瞳函数控制减小离散成像系统中的频谱混淆 总被引:2,自引:2,他引:0
离散控制器由于欠抽样产生频谱混淆,介绍分析了减少混淆的一种光学预滤波法:设计光学成像系统的瞳函数以产生期的光学传递函数,使期 对抽样数据进行有效的预滤法,从而完全抑制混淆。 相似文献
8.
针对热像仪前置栅网后产生的伪图像,以经典光学理论为基础,利用光的波动性质分析了栅网的前置对热成像影响的衍射作用机理,并且对非单色光目标情况也做了研究分析,进而建立了基于该成像机理下的数学模型.结果表明,当代入实际状态时的各项参数并用MATLAB对该模型进行图像仿真后,所得仿真图像与实际当中的伪图像相比较,取得了很好的相似性,达到了模型对这种现象进行描述的预期目的,并提出了需要进一步研究的问题和关键技术.
关键词:
热成像
衍射
傅里叶变换
栅网结构 相似文献
9.
10.
11.
The influence of sampling caused by 2-D solid-state image sensors (CCD) in FTP is discussed in this paper. As we all know, discrete fringe patterns processed by computer are obtained through two samplings. The first one is accomplished in the CCD image plane, and the second is accomplished in A/D convertor of frame grabber. In the previous analysis, sampling is just regarded as a point-sampling process because of ignoring the actual sensor structure of a CCD in the sampling process. Here we discuss the influence of the sensor structure of CCD in FTP, especially the influence from the light-sensitive area size variation. Certain formulas about sampling influence are given, and some simulations and a primary experimental demonstration are carried out to verify our analysis. 相似文献
12.
13.
CHEN Jiannong XU Qiang 《Chinese Journal of Lasers》2002,11(2):105-110
The relation between the 2nd fractional Fourier transform and the imaging process of an optical system is discussed. By changing the coordinate scales of the input plane in respect to the magnification of the optical imaging system, the fractional Fourier transform can be a powerful tool in designing specific imaging system. The Gaussian imaging formula of single lens is obtained by using the tool. Finally the procedures are generalized for designing a double-lens imaging system through an example. 相似文献
14.
The relation between the 2nd fractional Fourier transform and the imaging process of an optical system is discussed. By changing the coordinate scales of the input plane in respect to the magnification of the optical imaging system, the fractional Fourier transform can be a powerful tool in designing specific imaging system. The Gaussian imaging formula of single lens is obtained by using the tool. Finally the procedures are generalized for designing a double-lens imaging system through an example. 相似文献