导　　师： 陶纯堪

学科专业： H03

授予学位： 硕士

作　　者： ;

机构地区： 南京理工大学

摘　　要： 模式识别技术具有很重要的意义，它已广泛应用于字符识别、票证识别、工业零件识别和自动检验、医疗诊断、遥感图片识别以及军用目标识别等任务中。模式识别的目的就是对所研究的对象根据其某些特征进行分析、判断和分类。光学模式识别和计算机数字识别作为模式识别的两种主要方法各有其优缺点。光学模式识别信息处理容量大，运算速度快，但精度不高：而计算机模式识别精度高，存储灵活，易判断控制和分析，但是存储容量大，速度慢，实时性差。结合两者的优点，开发光电混合模式识别系统，是实现模式识别实用化的一种可行方案。本文首先在光学匹配滤波相关识别的基础上，论述了光学联合变换相关器识别的基本原理和技术。并针对经典联合变换相关器识别性能差的特点，提出了采用对联合功率谱进行调制和滤波的技术来改善其性能。其次，对于实时捕捉的目标图像，由于背景复杂，目标不明确。为此，进行了有效的预处理来提取所需目标的有效特征。在此基础上，为了解决目标图像与参考图像间存在的比例旋转等畸变问题，提出了多种方法，实现了对畸变图像的识别。 Pattern recognition technology is of great importance and has found applications in the fields of military target recognition, automation control and finger-print recognition. The purpose of pattern recognition is to analyze, judge and sort the object based on the object characteristics. It can be roughly divided into two categories: the optical pattern recognition and the computer-based digital pattern recognition. The optical pattern recognition has the advantages of being with superior high speed and parallel processing, which makes it a very important way to realize pattern recognition in real- time. However, its disadvantage is of low precision. On the other hand, the digital pattern recognition has the advantages of being with high precision, flexible storage, easy estimation and control, but it has the disadvantages, including mass storage, and the slow speed. Based on the combination of these two methods, a feasible optical-electrical hybrid joint transform correlator is proposed in this paper. First, based upon the spatial matched filter correlation, the joint transform correlation/(JTC/) is discussed. In order to improve the recognition ability of the classical JTC, the paper describes a technique for modulating and filtering joint power spectrum/(JPS/). Second, the real-time image's object is ambiguity because of complicated background. It is therefore necessary to pre-process the captured object image and extract its characteristics. In order to solve the distortion problem, including proportional and rotary transformation between the reference and the input image, some useful methods are proposed. Third, a practical optical-electrical hybrid joint transform correlator system is discussed. The system consists of an automatic image-capturing and image-processing unit based on the communication protocol, a high-speed image processing system based on the DSP and a miniature optical-electrical hybrid joint transform correlator. Finally, the experiment system is desc

关 键 词： 模式识别 信息处理 光电混合模式 特征提取

领　　域： [自动化与计算机技术] [自动化与计算机技术] [电子电信]