共查询到19条相似文献,搜索用时 187 毫秒
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为改善复杂光照条件下的多姿状鲁棒性人脸识别的效果,提出了小波变换与LBP的多姿状鲁棒性人脸识别方法。通过二维离散小波变换对人脸图像进行二级小波分解提取到低频特征信息分量,并以重构初始图像的方式实现降噪滤波处理,滤除低频光照分量后完成复杂光照补偿;继续分解复杂光照补偿后的图像,采用LBP算子对子图像的鲁棒性部分纹理特征进行描述后,提取出人脸图像各子图像的直方图特征并连接,得到人脸LBP纹理特征,通过统计法运算该特征距离,并通过K近邻分类器实现人脸特征分类识别。以Yale-B与AR人脸库为测试对象,结果表明,所研究方法对复杂光照鲁棒性较强,识别人脸的准确率与效率较高,整体识别效果较好。 相似文献
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文中针对在传统红外弱小目标检测中,需要进行背景抑制滤波所带来的图像性质改变和检测速度不理想的问题,提出了一种基于局部二元模式(local binary pattern,LBP)算子的红外弱小目标检测方法.该方法对传统LBP算子进行了改进,使其提取的LBP编码值可以有效地描述红外弱小目标的灰度分布特性,达到了在不进行背景抑制滤波的条件下有效检测弱小目标的目的.结合改进的LBP算子和红外弱小目标灰度的"尖峰"特征,建立了灰度自适应快速扫描机制,有效提高了检测速度,降低了重复告警的出现概率.通过实录红外图像序列检测实验,证明本文方法在检测性能和检测速度方面的有效性和优越性. 相似文献
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该文提出了一种基于Gabor滤波器和Three-Patch Local Binary Patterns(TPLBP)局部纹理特征提取的合成孔径雷达(Synthetic Aperture Rader, SAR)图像目标识别算法。首先, 利用Gabor滤波器对SAR图像在不同方向上进行滤波, 增强SAR图像中目标及其阴影的关键特征;然后, 利用TPLBP算法对Gabor滤波之后的图像进行局部纹理特征提取, 该算法克服了Local Binary Patterns(LBP)算法无法描述大范围领域纹理特征的缺陷, 并且保持了LBP旋转不变的特性, 减少了SAR图像目标方位变化对识别效果的影响;最后利用极限学习机(Extreme Learning Machine, ELM)分类器实现目标识别。该文通过MSTAR数据库中的3类SAR目标识别实验验证了该算法的有效性。 相似文献
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取穴准确性是决定针灸效果的最基本要求,这就需要对取穴体表特征进行精确地定位。文中提出一种新的人体体表特征定位的光学方法,在光学检测平台上通过相机采集不同方向的图像,选取合适的Gabor 滤波器参数,得到图像的强度响应并提取局部极大值,从而获得定穴体表轮廓特征。为验证该方法的有效性和精度,采用Sobel 算子、Canny 算子、LoG 算子以及Gabor 滤波器分别对灰度图像和二值图像进行特征提取。通过对比和分析,发现经过Gabor 函数滤波后得到的图像轮廓是连续且最清晰的;Gabor 函数对二值图像的滤波效果优于对灰度图像。实验结果表明,所提出的方法能精确快速地定位体表轮廓特征,为进一步利用轮廓特征提取定穴体表特征点以及研究穴位光学定位方法奠定基础。 相似文献
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针对局部二值模式(LBP)、中心对称局部二值模式(CS-LBP)和梯度方向直方图(HOG)的不足进行改进,该文提出中心对称局部平滑二值模式(CS-LSBP)和绝对梯度方向直方图(HOAG),并提出一种融合局部纹理特征和局部形状特征的人脸表情识别方法。该方法首先采用CS-LSBP算子和HOAG算子分别提取人脸表情图像的局部纹理特征和局部形状特征,然后使用典型线性分析法(CCA)进行特征融合,最后利用支持向量机(SVM)进行表情分类。在JAFFE人脸表情库和Cohn-Kanade(CK)人脸表情库上的实验结果表明,改进的特征提取方法能更加完整、精确地提取图像的细节信息,基于CCA的特征融合方法能充分发挥特征的表征能力,该文所提人脸表情识别方法取得了较好的分类识别效果。 相似文献
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传统的LBP算子只利用了局部的信息,而忽略了全局信息。MB_LBP算子虽然充分考虑了全局信息,但对局部信息的表示不足。在此提出一种改进后的LBP特征的人脸识别方法,改进后的LBP算子不仅能够利用局部特征,同时也兼顾了全局信息。该方法首先将人脸图像分块,对于每个分块,计算LBP特征,对于得到的LBP特征,根据其中心像素和分块灰度均值关系重新进行计算得到改进后的LBP特征,最后采用最近邻分类器进行识别。在ORL和YALE标准人脸数据库上的实验表明,改进后的识别效果优于使用传统LBP算子和MB_LBP算子。采用改进后的LBP算子,能够明显提高识别率,在ORL和YALE的实验显示能提高3%~8%左右的识别率。 相似文献
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局部二值模式(Local Binary Pattern,LBP)在纹理分类中受到越来越多的关注,传统的基于局部二值模式的图像识别方法在LBP直方图统计时仅仅考虑到LBP模式值本身的数量统计,却忽略了模式值之间的相关性.针对这一问题,本文提出一种二维局部二值模式(Two Dimensional Local Binary Pattern,2DLBP)方法,并用于纹理图像识别.首先以旋转不变均匀LBP特征图为基础,引入滑动窗口和LBP模式对的概念,统计LBP模式图的上下文信息,构造出2DLBP特征;然后改变LBP中的半径参数,构造图像的多分辨率2DLBP特征,并利用支持向量机(SVM)的分类方法进行纹理分类;最后选取Brodatz、CUReT、UIUC、FMD四个公开纹理库分别进行纹理分类测试.理论验证表明该方法具有良好的通用性,可以与LBP的其他变型结合成为新的图像特征构造方法.同时,实验结果表明,本文提出方法具有较好的纹理图像分类能力. 相似文献
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This paper proposes the recognition and classification of three dominant patterns of woven fabrics such as twill, satin and plain. The proposed classifier is based on the texture analysis of woven fabric images for the recognition. In the pattern recognition phase, three methods are tested and compared: Gabor wavelet, local binary pattern operators and gray-level co-occurrence matrices (GLCM). Taking advantage of the differences between the woven fabric textures, we adopt a technique which is based on the texture of the images in the pattern recognition phase. For the classification phase we used a support vector machine, which we have proven is a suitable classifier for this type of problem. The experimental results show that some of the studied methods are more compatible with this classification problem than others. Although it is the oldest method, GLCM always remains accurate (97.2%). The fusion of the Gabor wavelet and GLCM gives the best result (98%), but GLCM have the better running time. 相似文献
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For reasons of public security, modeling large crowd distributions for counting or density estimation has attracted significant research interests in recent years. Existing crowd counting algorithms rely on predefined features and regression to estimate the crowd size. However, most of them are constrained by such limitations: (1) they can handle crowds with a few tens individuals, but for crowds of hundreds or thousands, they can only be used to estimate the crowd density rather than the crowd count; (2) they usually rely on temporal sequence in crowd videos which is not applicable to still images. Addressing these problems, in this paper, we investigate the use of a deep-learning approach to estimate the number of individuals presented in a mid-level or high-level crowd visible in a single image. Firstly, a ConvNet structure is used to extract crowd features. Then two supervisory signals, i.e., crowd count and crowd density, are employed to learn crowd features and estimate the specific counting. We test our approach on a dataset containing 107 crowd images with 45,000 annotated humans inside, and each with head counts ranging from 58 to 2201. The efficacy of the proposed approach is demonstrated in extensive experiments by quantifying the counting performance through multiple evaluation criteria. 相似文献
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图像的灰度共生矩阵(GLCM)已知被理论证明并且实验显示它在纹理分析中是一个很好的方法,广泛用于将灰度值转化为纹理信息.然而,由于GLCM是像素距离和角度的矩阵函数,因此完整的GLCM的计算,其参数的选取范围很广,这样GLCM的计算量很大,通常是不能这样用的.为了解决这个问题,本文应用马尔可夫链的性质,从理论上证明了GLCM的计算结果,当像素距离足够大的时候趋于一致性.这样只需较少的参数值就可以完整的描述图像的纹理特征.最后,通过对Brodatz纹理库中自然纹理图像和几幅SAR图像进行仿真,仿真结果验证了上述结论. 相似文献
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Iris anti-spoofing is one of the most important topics, in which the development is increasing rapidly. This paper introduces an efficient system for detecting iris attacks. The system avoids the segmentation and the normalization stages employed traditionally in fake detection systems. Wavelet packets (WPs) are used to decompose the original image into wavelet approximation and detail channels. Entropy values are extracted from the wavelet channels, and also from the local binary pattern (LBP) images of the channels. These features are used for discriminating between real and fake iris images. Support vector machines are used for the classification purpose. The aim is to contribute for improved classification accuracy with less computational complexity and reduced processing time. Entropy of the WP channels gives 99.9237% classification accuracy, and the entropy of the LBP images yields 99.781%, using ATVS-FIr-DB. Fusion of these features yields 100% classification accuracy. Entropy of the wavelet channels is sufficient to obtain 100% accuracy using CASIA-Iris-Syn database, without fusion. All images in both databases are used, without the need to discard images with unsuccessful segmentation. Segmented images from both databases are used for comparison. Results show that more discriminative features can be obtained using the proposed algorithm. System complexity and processing time are reduced noticeably, and the system is robust to different types of fakes. 相似文献
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