共查询到20条相似文献,搜索用时 359 毫秒
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应用计算全息制作的子波匹配滤波器实现光学子波变换的研究 总被引:6,自引:0,他引:6
介绍了一种应用计算全息制作的子波匹配滤波器实现光学子波变换的新方法,应用计算全息制作Haar子波函数的匹配滤波器和光学Vander Lugt相关器实现了二维子波变换,给出了实验结果。这种方法可实现任意子波函数的光学子波变换,且简单易行。 相似文献
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用全息透镜组成傅里叶变换系统 总被引:3,自引:0,他引:3
本文将全息透镜作为一般的傅里叶变换元件,组成傅里叶交换系统,进行了相关运算以及模糊图象处理等实验.结果表明,对全息透镜傅里叶变换系统进行某些光学信息处理工作是可行的. 相似文献
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计算全息图在光学变换中的应用 总被引:3,自引:0,他引:3
本文讨论如何利用计算全息图作为全息透镜以实现圆环到直线,直线到点以及圆环到点等光学变换,采用液晶电视空间光调制品准实时地产生计算全息图。 相似文献
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基于全息技术的光学加密系统实值编码 总被引:2,自引:1,他引:1
提出一种基于全息技术用于光学图像加密的实值编码方法.待编码的数字图像与一个大小相同、灰度值为零的图像组成一幅新的图像,然后与一个随机相位掩膜一起通过光学透镜作傅里叶变换,取变换结果的实部作为编码输出图像.利用全息记录的方法解码,即编码输出图像和随机相位掩膜的傅里叶变换相加通过光学透镜作傅里叶反变换,记录反变换的光强分布,再通过非线性变换或灰度变换的方法可以恢复原图像. 相似文献
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A scaling correlator optical pattern recognition system is described in which a lensless matched spatial filter (with the second Fourier transform lens and the matched spatial filter recorded on the same plate) is used with a first Fourier transform lens that is also an holographic optical element. The matched spatial filter is recorded at one wavelength and correlation is obtained at a second wavelength. Experimental demonstration and output correlation SNR data are reported, together with a comparison of the system's noise level using conventional optics and holographic elements. 相似文献
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无狭缝一步彩虹全息的新方法 总被引:5,自引:1,他引:4
本文提出一种新的三维漫射物体的一步彩虹全息方法.该法是在曝光过程中将被摄物体与成像透镜同时沿垂直光轴方向移动,并通过场镜使合成狭缝直接成像在场镜后焦面上,可得到较大观察范围的无畸变彩虹全息像. 相似文献
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像差会影响光镊对粒子的捕获效果. 全息阵列光镊中, 像差不仅来自光学元件, 由特定算法设计的光阱相位片也会在光路中引入像差. 本文通过液晶空间光调制器加载泽尼克多项式相位图, 对全息阵列光镊中由光栅透镜组型算法引起的像差进行校正. 结果显示: 利用三阶泽尼克多项式可有效消除光路中由光栅透镜组型算法引 起的慧差, 使得捕获2 μm聚苯乙烯小球的阵列光阱刚度提高了约40%; 对比不同项的像差校正结果发现, 全息阵列光镊中由算法引起的慧差 与光学元件引起的像差一样, 也会对阵列光阱的捕获效果产生较大影响; 同时根据一阶像差校正结果可得光栅透镜 组型算法对于一阶泽尼克像差具有鲁棒性. 实验结果表明, 对全息阵列光镊中由 算法引起的像差进行校正, 对于提高光阱的捕获效果和深化对算法特性的认识都具有重要意义. 相似文献
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Use 2×2 holographic lens array for realizing FPS optical interconnection. The derivation of all cases with parallel light incidence and the divergent light incidence indicated: the focus positions of the first and the third quadrants of the holographic lens array were related to the lens aperture and the number of input elements. The formulas of the imaging distance and system magnification of all the cases are in keeping with what the PS interconnection under the same condition. 相似文献
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LIU Yi WNAG Shifan HE Shumei 《Chinese Journal of Lasers》1999,8(3):243-248
1IntroductionTheFoldPerfectShufle(FPS)opticalinterconnectionisthe1DPerfectShufle(PS)opticalinterconnectionrealizedbymeansof2... 相似文献
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在离散取样情形下,证明了利用单个全息透镜所组成的光学系统能够实现任意给定的线性变换;给出了为实现给定变换而设计全息透镜振幅和相位分布的方法;并以三种不同序的八维Walsh变换为例,得到了实现这些变换的全息透镜的振幅和相位分布。
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Francisco Palacios Daniel Palacios Edison Gonçalves Laszlo Sajo-Bohus 《Optics Communications》2008,281(4):550-558
In this paper, processing methods of Fourier optics implemented in a digital holographic microscopy system are presented. The proposed methodology is based on the possibility of the digital holography in carrying out the whole reconstruction of the recorded wave front and consequently, the determination of the phase and intensity distribution in any arbitrary plane located between the object and the recording plane. In this way, in digital holographic microscopy the field produced by the objective lens can be reconstructed along its propagation, allowing the reconstruction of the back focal plane of the lens, so that the complex amplitudes of the Fraunhofer diffraction, or equivalently the Fourier transform, of the light distribution across the object can be known. The manipulation of Fourier transform plane makes possible the design of digital methods of optical processing and image analysis. The proposed method has a great practical utility and represents a powerful tool in image analysis and data processing. The theoretical aspects of the method are presented, and its validity has been demonstrated using computer generated holograms and images simulations of microscopic objects. 相似文献