共查询到20条相似文献,搜索用时 62 毫秒
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基于纹理特征的方法被广泛应用于人脸识别。然而纹理特征依赖于图像的高频细节信息,当图像出现模糊时,单纯利用纹理特征的识别方法的识别精度会急剧下降。为了克服纹理特征的在模糊人脸识别中的不足,提出了一种基于色彩特征和纹理特征融合的识别方法。首先参照人类的对立色感知机制提取人脸的色彩特征;然后,将该色彩特征和纹理特征分别用于识别分类;最后,将二者的识别相似度进行融合,得到最终的识别结果。该色彩特征描述了图像的低频信息,其对图像模糊不敏感,并且与描述图像高频信息的纹理特征具有良好的互补性。在FERET 和AR 人脸库上的实验表明,融合色彩特征和纹理特征有效地提高了模糊人脸的识别精度。 相似文献
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基于空间映射复Directionlet变换的图像纹理分类 总被引:2,自引:0,他引:2
Directionlet变换具有多方向各向异性基函数,能有效捕捉图像的奇异性特征。该文在此基础上构造了一种空间映射的复Directionlet变换,使其具备了更为灵活的方向选择性和近似的平移不变性。利用空间映射方法获得Directionlet变换的复函数空间,对多尺度各方向子带系数提取能量特征用于图像纹理分类。通过对Brodatz图像库及真实SAR图像的纹理分类实验表明,该文算法较之小波分析及其它多尺度几何分析方法,具有更优的纹理分类性能,也验证了Directionlet工具在图像分析中的应用潜力。 相似文献
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合成孔径雷达(SAR)图像具有丰富的纹理信息,这些纹理信息能反映地物空间结构关系。当前纹理特征被广泛应用于SAR图像分类和SAR图像分割中。受成像因素影响,直接采用从SAR图像中提取的纹理特征效果不够好。为避免传统先滤波再提取纹理特征的方法对纹理、边缘信息造成损失,提出了一种先提取SAR图像纹理特征,再利用Robust PCA方法对纹理特征去噪的新方法,最后采用Kmeans聚类方法检验RPCA处理后的纹理特征表达效果。实验结果表明该方法能将聚类正确率从82%提高到84%。 相似文献
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Texture Unit, Texture Spectrum, And Texture Analysis 总被引:12,自引:0,他引:12
Dong-chen He Li Wang 《Geoscience and Remote Sensing, IEEE Transactions on》1990,28(4):509-512
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Lightweight Probabilistic Texture Retrieval 总被引:2,自引:0,他引:2
This paper contemplates the framework of probabilistic image retrieval in the wavelet domain from a computational point of view. We not only focus on achieving high retrieval rates, but also discuss possible performance bottlenecks which might prevent practical application. We propose a novel retrieval approach which is motivated by previous research work on modeling the marginal distributions of wavelet transform coefficients. The building blocks of our work are the dual-tree complex wavelet transform and a number of statistical models for the coefficient magnitudes. Image similarity measurement is accomplished by using closed-form solutions for the Kullback-Leibler divergences between the statistical models. We provide an in-depth computational analysis regarding the number of arithmetic operations required for similarity measurement and model parameter estimation. The experimental retrieval results on a widely used texture image database show that we achieve competitive retrieval results at low computational cost. 相似文献
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提出一种基于OpenGL的几何纹理生成方法,该方法通过对一类几何纹理构成规律的研究,选择随机函数和三角函数作为扰动函数,对景物表面法向量进行扰动,产生相应的几何纹理。实验结果验证了方法的有效性。 相似文献
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基于已有的纹理合成算法,提出将单象素点的纹理合成改进为矩形纹理区域的合成,以加速合成过程,匹配矩形纹理区域时采用提取纹理结构信息的方法来实现,取得了较好的合成结果.实验结果表明,改进的算法无论在合成速度和合成质量上都有较大的提高,对于大纹理的合成,速度更快,而且有广泛的适用性. 相似文献
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Texture classification using spectral histograms 总被引:11,自引:0,他引:11
Xiuwen Liu DeLiang Wang 《IEEE transactions on image processing》2003,12(6):661-670
Based on a local spatial/frequency representation,we employ a spectral histogram as a feature statistic for texture classification. The spectral histogram consists of marginal distributions of responses of a bank of filters and encodes implicitly the local structure of images through the filtering stage and the global appearance through the histogram stage. The distance between two spectral histograms is measured using /spl chi//sup 2/-statistic. The spectral histogram with the associated distance measure exhibits several properties that are necessary for texture classification. A filter selection algorithm is proposed to maximize classification performance of a given dataset. Our classification experiments using natural texture images reveal that the spectral histogram representation provides a robust feature statistic for textures and generalizes well. Comparisons show that our method produces a marked improvement in classification performance. Finally we point out the relationships between existing texture features and the spectral histogram, suggesting that the latter may provide a unified texture feature. 相似文献
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Harry Wechsler 《Signal processing》1980,2(3):271-282
Texture is the term used to characterize the surface of a given object or phenomenon and it is undoubtedly one of the main features used in image processing and pattern recognition. It is commonly agreed that texture analysis plays a fundamental role in classifying and outlining the significant regions of a given gray level image. Texture can be seen in images ranging from multispectral remote sensed data to microscopic images. A solution to the texture analysis problem will greatly advance the image processing and pattern recognition fields and it will also bring much benefit to many possible industrial applications.This survey presents the state-of-the-art in the texture analysis field and it includes also its relation to scientific fields like artificial intelligence and visual perception. The paper outlines the main issues and difficulties and then it presents most of the relevant methods used today in texture analysis. We conclude by outlining directions for future research as they are perceived today in the image processing community. 相似文献