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Pattern recognition based on analysis of the summary ellipse polarization state in the Fraunhofer diffraction area

机译:基于Fraunhofer衍射区椭圆偏振态的模式识别。

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A new method of pattern recognition is presented which is based on obtaining photoanisotropic copies on the dynamic polarization sensitive material. The amplitude image of the object is illuminated by a linearly polarized light with a wavelength actinic for this material. In result a photoanisotropic copy of this image is induced on the polarization-sensitive material. In recognition process, a photoanisotropic copy is illuminated by circularly polarized light of a nonactinic wavelength. The distribution of elliptical polarization occurs behind a photoanisotropic copy and reduces to a summary ellipse in the Fraunhofer diffraction region. The parameters of this ellipse are related to the characteristics of the original object and uniquely identify the initial object. The polarization-holographic diffraction element developed by us enables to determine summary ellipse parameters - to obtain all the Stokes parameters in real time and to compare obtained results with recognizable object etalon in database. The method invariance to position, scale and rotation of pattern are investigated. The resolution and sensitivity of this method were also determined. The dynamic polarization-sensitive materials are reversible, with practically unlimited number of recording-deleting cycles. To obtain a photoanisotropic copy of another object on the same material, the previous copy should be deleted with a pulse of circularly polarized actinic light, then a next copy can be recorded. A laboratory model of the recognition device, appropriate software and a theoretical model were created. Database have been obtained by using images of various objects.
机译:提出了一种新的模式识别方法,其基于获得动态偏振敏感材料上的光偶联拷贝。物体的幅度图像由线性偏振光照射,其具有用于该材料的波长偏光。结果,在偏振敏感材料上诱导该图像的光偶像拷贝。在识别过程中,通过非分离波长的圆偏振光照射光偶联拷贝。椭圆偏振的分布发生在光秃秃的拷贝后面,并减少到Fraunhofer衍射区域中的概要椭圆。该椭圆的参数与原始对象的特征有关,唯一地标识初始对象。由我们开发的偏振 - 全息衍射元件能够确定摘要椭圆参数 - 要实时获取所有Stokes参数,并将获得的结果与数据库中可识别的对象标准符进行比较。研究了方法不变性,图案的定位,比例和旋转。还确定了该方法的分辨率和敏感性。动态偏振敏感材料是可逆的,几乎无限数量的记录删除循环。为了在同一材料上获取另一个对象的光秃秃的副本,应该用圆极化的光化光脉冲删除先前的副本,然后可以记录下一个副本。创建了识别设备,适当的软件和理论模型的实验室模型。已经通过使用各种对象的图像获得了数据库。

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