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基于图像的人体检测跟踪和人脸识别的研究
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摘要
基于图像的人体检测跟踪和人脸识别问题是当今计算机视觉和模式识别领域的热点研究问题,它在图像处理、智能监控、智能汽车系统等领域有着广泛的应用前景。本文针对图像中运动人体检测跟踪和人脸识别中的一些关键问题进行研究,并取得了一定的进展,具体有如下四方面:
     在人体检测方面,提出了基于二次连通域处理的人体检测方法,这种方法首先提取运动目标并作数学形态学处理,然后采用四方向连接方法去除空洞,第一次连接断开区域,接着采用三次扫描标记法第二次连接断开区域,随后提取HOG特征,利用Adaboost训练强分类器进而识别运动前景是否是人体。
     在人体跟踪方面,提出了基于改进Meanshift的人体跟踪方法,这种改进方法是通过判别跟踪区域是背景区域或前景区域来设置权重系数,同时将跟踪区域精确到运动人体,再结合卡尔曼滤波器来预测运动人体下一步的方向,由于降低了背景区域的计算量,所以跟踪效果更好些。
     在光照预处理方面,提出了改进高斯差分滤波的光照预处理方法,通过改变高斯差分滤波器中水平方向和垂直方向的参数,进而将原来的圆形滤波器扩展为椭圆形滤波器,更加适合人脸的面部特征,对于光照不均匀情况适应性较好,结合人脸识别算法获得了较高的人脸识别率和较低的人脸误识率。
     在人脸识别方面,提出了基于Adaboost的双向2DLDA融合的人脸识别方法,即2DLDA和E2DLDA的融合。2DLDA主要利用图像垂直方向上的判别信息,E2DLDA主要利用图像水平方向上的判别信息,然后利用Adaboost融合这两个方向的判别信息,实验表明整体的识别算法具有更好的识别性能。
Computer vision usually means the process of obtaining visual information andpost-processing by computer control and sensor equipment from the surrounding environment,including expression, compression, analysis, processing, storage, and so on, so as to realizethe human biological vision of the function "look". In recent years, the rapid development ofcomputer technology, photovoltaic technology and automation technology, with theemergence of the computer vision system and widely used in the continuous improvement ofscience, industrial, medical and military fields, computer vision technology has become a hotspot of research. Research on computer vision systems has great value and significance bothin theoretical research and practical application research.
     Human detection tracking and face recognition is the hot research field in computer visionand pattern recognition, it has a broad application prospects in the field of graphics, imageprocessing, intelligent monitoring, smart car system and so on. This paper focuses on somekey issues of human detection tracking and face recognition in image. The details are asfollows:
     In aspect of moving human detection, human recognition method is widely used in allkinds of videos. But recognition accuracy of these methods is changed negatively because ofcomplexity of background, e.g. void and noise. So a moving body recognition method withbackground robustness is proposed to solve this problem. This method uses tripling temporaldifference method to recognize moving object and dilate the computed binary image withmathematical morphology. And then it uses quadruple directions connection method toconnect disconnection areas. Finally, train the classifier by HOG feature to identify whetherthe moving target is human or not. This method not only needs no restraint of background, butalso shows less computation and higher accurate. Experiment results show its positivecomputational complexity, accuracy and robustness.
     In aspect of moving human tracking, classic meanshift algorithm is widely used in patternrecognition, but its accuracy decrease large when there is perturbation in background. So tosolve this problem, an improved meanshift method to recognize and track moving body isproposed. This method resets weighting coefficient automatically by detecting tracking area isforeground or not. To compare with exist method, the new method decreases computationamount of background, changed tracking area and predict to moving body. So tracking effectis better than others. Experiment result validates accuracy, effectiveness and robustness.
     In aspect of illumination pretreatment, illumination pretreatment is an important researchdomain of face recognition, and it has a very important influence to the face recognition, to solve the problem of abnormal light, an improved DOG algorithm to make illuminationpretreatment is proposed. To combine with face reorganization method, compare and analyzelots of characters with experiments of major illumination pretreatment algorithms. Fromexperiment results, the improved DOG algorithm is better than any other ones when there arechanges in illumination and expression of images.
     In aspect of face recognition, a challenge for face recognition is variation, such as due tolighting or facial expression differences. To solve this problem, this method fusesbidirectional two-dimensional linear discriminant analysis (2DLDA) feature by adaboosttechnique and propose a novel recognition method called AB2DLDA. It can perform wellwith small number of samples.This method uses adaboost to design a classifier and fuses2DLDA and E2DLDA method to improve recognition performance. Experimental resultsshow that the method has good recognition accuracy and robustness.
     The research based on the moving body detection tracking and face recognition in image isan important subject in a wide range field of computer vision, there are still many difficultpoints which need further research, may this article could give the researchers someinspiration and help.
引文
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