共查询到18条相似文献,搜索用时 62 毫秒
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提出了一种基于独立元分析(ICA)的视觉皮层简单细胞工作机制的模型。用Gabor函数逼近对自然图像进行ICA而获得的基函数,揭示了ICA基函数与视觉皮层简单细胞感受野反应间存在内在的关系。并对水平条纹的图像进行ICA,模拟在特殊视觉环境下生长的幼年动物的视觉皮层发育过程,证实了1970年Blakemore和Cooper在幼猫上的实验结果。从而说明ICA可以模拟动物的视觉皮层简单细胞工作过程。 相似文献
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在疗效化妆品中,常常需要对护肤品的性能和效果进行分析。皮肤纹理的检测是客观衡量疗效化妆品的有效手段。基于计算机视觉技术的皮肤纹理分析,对拍摄的皮肤图像要进行图像预处理,增强图像,为后续的分析提供有效的数据。采用经过微调的定向的Gabor滤波器进行增强图像,通过实验得出Gabor滤波器不仅抑制噪声的效果好,还保留了皮肤图像的整体和局部特征。 相似文献
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Tao Xu Xing Ming Xiaoguang Yang .College of Mechanical Science Engineering Jilin University Changchun P.R.China .College of Computer Science Technology Jilin University Changchun P.R.China .Dept of Mathematics Physics Dalian Maritime University Dalian P.R.China 《仿生工程学报(英文版)》2004,1(1):72-78
1 IntroductionIrisrecognitiontechniqueisbasedonthestableanddistinctiveirispatterns,andhasattractedmuchat tentionofsomeexpertsforthelastfewdecades .Sincethe 1990’s ,muchworkonirisrecognitionhasbeendoneandgreatprogresshasbeenmade[1- 4] .Nowadaysithasbecomeamostimportantbiometricsolutionforpersonalidentification .Anirishasanapproximatelycircularannularshape.Theiristexturehasarandomlydistributedstructureofdetails ,whichiscreatedbyradialandcon centricfurrows,pigmentspots,crypts ,pigmentfrillandc… 相似文献
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In video sequence-based iris recognition system, the problem of making full use of relationship and correlation among frames still remains to be solved. A brand new template level multimodal fusion algorithm inspired by human cognition manner is proposed. In that a non-isolated geometrical manifold, named Hyper Sausage Chain due to its sausage shape, is trained using the frames from a pattern class for representing an iris class in feature space. We can classify any input iris by observing which manifold it locates in. This process is closer to the function of human being, which takes 'matter cognition' instead of 'matter classification' as its basic principle. The experiments on self-developed JLUBR-IRIS dataset with several video sequences per person demonstrate the effectiveness and usability of the proposed algorithm for video sequence-based iris recognition. Fur- thermore, the comparative experiments on public CASIA-I and CASIA-V4-Interval datasets show that our method can also achieve improved performance of image-based iris recognition system, provided enough samples are involved in training stage. 相似文献
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Wei Lian-xin Ma Fu-ming Xu Tao Li Zhi-hui Wu Deng-feng 《仿生工程学报(英文版)》2005,2(4):203-207
1IntroductionIris identification is reputed to be one of the mostreliable biometric identification technologies.Wavelettheory has been widely used in feature analysis of the irisimage-the key to this technology.The classical irisrecognition algorithms were developed by Daugman[1]and Wildes[2].Zero-crossings of the wavelet transformwas presented by Boles[3].Gabor filter optimizationdesign for iris texture analysis and a multi-matchingsystem based on a simplified deformable model of thehuman i… 相似文献
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Olaf Schlimpert Dietrich Uhlmann Martina Schüller Erhard Hhne 《International Review of Hydrobiology》1980,65(3):427-437
Pictures of phytoplankton samples were analyzed as raster images by means of a television camera and a Robotron 4200 computer. A feature vector described the objects irrespective of their angle. Each of the five genera involved were identifiable by a characteristic point cluster in a p-dimensional feature space. A learning method was used during development of the classification structure, and the quality of identification was increased incrementally to the greatest possible degree. Asterionella formosa was identified in all cases without error despite the relatively coarse scanning grid. Errors in the identification of Fragilaria crotonensis can be reduced by improving the resolution (over 100 picture elements per colony). 相似文献
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为了客观准确地反映病理形态学方面常使用的经验型语言,如:淋巴滤泡生发中心细胞“轻度活跃”、“中度活跃”、“极度活跃”、生发中心免疫复合物“少量沉积”、“中等量沉积”、“大量沉积”等等病理学术语。我们将模糊数学理论引入计算机识别系统。在经验积累的基础上,以求能相对一致地表达这些模糊语言。本文以“猴艾滋病模型建立及中药治疗”研究工作中淋巴结活检病理观察出现的病理现象为例,说明应用本套系统是可以达到上述目的,并可用于检查淋巴结中病毒含量及免疫复合物沉积量。 相似文献
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植物叶形的计算机识别系统 总被引:21,自引:0,他引:21
植物叶形是识别植物的重要和常用形态特征,建立计算机自动识别系统对于认识和正确识别植物十分重要.本文论述了植物叶形图像识别系统设计中的图像处理、特征提取及分类识别等问题.本系统采用Visual Basic.Net编程工具设计,在Windows 2000/XP平台上通过叶片图像的输入、变换、平滑和分割等识别过程,实现了叶片图像的形状和叶缘特征的结果输出.实验结果表明,该系统能够很好地识别植物的叶形,对14种植物337份叶片样本的叶形测试准确率达93.2%.为植物识别的进一步研究奠定了基础. 相似文献
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1 Introduction Iris recognition technology is based on the stableand distinctive iris patterns, and has attracted a lot ofattention recently. Nowadays it has become a most im-portant biometric solution for personal identification. Since the 1990s, much work on iris recognition hasbeen done and great progress has been made. Some pre-dominant algorithms for iris recognition have beenproposed. Daugman generated an iris code by quantizingthe local phase angle using a set of 2-D Gabor f… 相似文献
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采用主成分分析、偏最小二乘回归和BP神经网络三种方法对嗜热和常温蛋白进行模式识别。结果表明,三种方法对训练集拟合的平均正确率分别为92%、95%和98%,对测试集进行预测的平均正确率分别为60%、72.5%和72.5%,对嗜热蛋白预测正确率最高为75%,常温蛋白最高为85%。构建了数学模型并对其生物学意义进行了解释,建立了一种基于序列的识别嗜热和常温蛋白的新方法。 相似文献