Pattern recognition is an important branch with special attentionin optical information processing. The theory and techniques ofcoherent optics、optical Fourier transformation、laser、hologram andthe optical spatial filtering provide the basis of the optical patternrecognition and make it improved.1.In the paper we proposed a new type of Fresnel holographic filter--A complex Fresnel filters which are recorded on the same place of thephoto sensitive plate. The intensity corrlation result with the filterhave been obtained.
为了提高光学神经网络系统实现正确神经元互连的极限神经元数，我们在C系统的基础上进行改造，提出了一种全并行光学神经网络互连系统的结构方案，该系统克服了C系统中透镜阵列成像中由于各个小透镜离轴状况下所造成的离轴象散的限制，使系统的神经元总数得以很大提高，改进后的C系统，即全并行神经网络互连系统具有体积小、调整零活方便、易于加工制作等优点。
It is shown that the reflection holographic filter has high optical density of peak wavelength, narrow half bandwidth, and very good tunability.
结果表明，反射全息滤光片不仅具有高光密度（大于4D）和窄带宽，还具有很好的调谐性能。
The principle and method of holographic record of the particle field by 4F Fourier lens system and holographic filter are introduced in this paper.
本文介绍用4F傅里叶透镜系统和全息滤波器对粒子场分布作全息记录的原理和方法。
The optical double correlation is a new technique not using a holographic matched filter.
光学双相关技术是一种不用光学全息匹配滤波器的新技术。
Through the theoretical and practical ways, verify the possibility of applying the Wiener filter in the volume holographic storage correlation recognition. 3.
将维纳滤波器应用到体全息相关识别当中，理论上推导出改进的维纳滤波器，并在实验上验证了该方法的识别效果。
In this paper some charactristics for holographic emulsion caused by bleaching processing are considered and the method for preparing the phase filter is given.
本文研究了全息干板漂白乳胶折射率变化的某些特性，并给出了制备相位滤波器的方法。
Without pre-fabricating holographic filter, the opto-electronic hybrid target recognition system, which is composed of optical joint transform correlator (JTC) and electronic processing unit, can be applied in autonomous target recognition and real-time tracking.
光学联合变换相关器由于无需预先制作全息滤波器，可与电子处理单元结合构成光电混合目标识别系统，应用于自主目标识别与实时跟踪。
It is made up of the light source, collimation objective, sample pool, ray filter, entering slot, plane speculum, holographic grating and CCD.
根据这些条件，我们可以计算出入射狭缝、光栅和出射狭缝的相对位置（我们这里采用了罗兰圆装置）。