共查询到20条相似文献,搜索用时 281 毫秒
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提出了一种利用车牌字符集特征来优化字符骨骼处理、改进骨骼变长编码的新方法,并把其用于车牌字符精确识别.该方法先利用车牌字符集特征优化处理标准车牌字符骨骼,再将"替换规则"与8方向链码相结合对其进行变长编码的结果作为模板,然后用同样方法得到待识别的车牌字符编码,将该编码与模板进行最佳匹配,实验结果表明,该方法具有实现简单、处理数据量小、抗旋转和对低分辨率车牌字符识别性能好等优点. 相似文献
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针对纹理统计法和结构法各自存在的问题,提出了一种基于纹理基元空间分布特征的图像检索算法。首先借鉴方块编码的思想来定义图像的纹理基元,然后在对纹理基元的统计分布研究的基础上,针对每一种纹理基元构造纹理基元空间分布图,提出采用纹理基元空间分布特征矢量对图像内容进行描述。实验结果表明,该算法既有效利用了图像的纹理信息,又考虑了纹理的空间分布信息,具有较好的检索效果。 相似文献
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基于方块编码纹理特征的图像检索算法研究 总被引:1,自引:0,他引:1
提出了一种新的基于方块编码(BTC)的图像纹理检索算法.首先将检索图像分成互不重叠的子图像块,然后利用BTC的思想来对这些图像块进行编码,进而进一步定义图像的纹理基元并以此作为图像的纹理描述,提出了一种改进的基于纹理基元的灰度共生矩阵来获得纹理特征,以此进行图像检索.实验结果表明,文中提出的算法比传统的灰度共生矩阵算法和颜色共生矩阵算法具有较高的检索准确度. 相似文献
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珍珠形状匀称性是衡量珍珠质量的重要指标之一。提出了一种新的珍珠形状匀称性检测算法——四象限边缘链码自相似性检测算法,是通过计算各个象限中边缘链码之间的相似度来判定珍珠形状的匀称性算法。采用四个方向的边缘算子对珍珠形状特征面进行边缘检测、融合,把已融合的珍珠边缘划分在四个象限;通过旋转、翻转方法把不同象限的珍珠边缘表示在同一象限;对表示在同一象限中的珍珠边缘进行8方向数链码编码,根据边缘链码计算出珍珠边缘的自相似性。实验显示,四象限边缘链码自相似性能够很好地描述珍珠形状匀称性,具有一定的实用价值。 相似文献
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Texture based image analysis techniques have been widely employed in the interpretation of earth cover images obtained using remote sensing techniques, seismic trace images, medical images and in query by content in large image data bases. The development in multi-resolution analysis such as wavelet transform leads to the development of adequate tools to characterize different scales of textures effectively. But, the wavelet transform lacks in its ability to decompose input image into multiple orientations and this limits their application to rotation invariant image analysis. This paper presents a new approach for rotation invariant texture classification using Gabor wavelets. Gabor wavelets are the mathematical model of visual cortical cells of mammalian brain and using this, an image can be decomposed into multiple scales and multiple orientations. The Gabor function has been recognized as a very useful tool in texture analysis, due to its optimal localization properties in both spatial and frequency domain and found widespread use in computer vision. Texture features are found by calculating the mean and variance of the Gabor filtered image. Rotation normalization is achieved by the circular shift of the feature elements, so that all images have the same dominant direction. The texture similarity measurement of the query image and the target image in the database is computed by minimum distance criterion. 相似文献
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介绍一种基于频域的指纹图像增强算法,提出了一种新的纹线方向场估计方法,并根据纹线频谱分布特点,将求取方向场仅限定在了一个较小的圆环区域内进行。提出了基于纹线频谱能量分布的指纹图像滤波算法,它通过计算块频谱图中纹线频谱能量分布范围的变化自适应地改变角度滤波器通带范围。实验对比结果表明,经该算法增强后的图像脊谷信息清晰,具有较好的纹线增强效果。 相似文献
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Space-Optimized Texture Maps 总被引:1,自引:0,他引:1
Texture mapping is a common operation to increase the realism of three‐dimensional meshes at low cost. We propose a new texture optimization algorithm based on the reduction of the physical space allotted to the texture image. Our algorithm optimizes the use of texture space by computing a warping function for the image and new texture coordinates. Neither the mesh geometry nor its connectivity are modified by the optimization. Our method uniformly distributes frequency content of the image in the spatial domain. In other words, the image is stretched in high frequency areas, whereas low frequency regions are shrunk. We also take into account distortions introduced by the mapping onto the model geometry in this process. The resulting image can be resampled at lower rate while preserving its original details. The unwarping is performed by the texture mapping function. Hence, the space‐optimized texture is stored as‐is in texture memory and is fully supported by current graphics hardware. We present several examples showing that our method significantly decreases texture memory usage without noticeable loss in visual quality. 相似文献
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Kashif Iqbal Michael O. Odetayo Anne James 《Journal of Computer and System Sciences》2012,78(4):1258-1277
In this paper, we discuss a new content-based image retrieval approach for biometric security, which is based on colour, texture and shape features and controlled by fuzzy heuristics. The proposed approach is based on the three well-known algorithms: colour histogram, texture and moment invariants. The use of these three algorithms ensures that the proposed image retrieval approach produces results which are highly relevant to the content of an image query, by taking into account the three distinct features of the image and similarity metrics based on Euclidean measure. Colour histogram is used to extract the colour features of an image. Gabor filter is used to extract the texture features and the moment invariant is used to extract the shape features of an image. The evaluation of the proposed approach is carried out using the standard precision and recall measures, and the results are compared with the well-known existing approaches. We present results which show that our proposed approach performs better than these approaches. 相似文献
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基于影像特征级数据融合的遥感图像重构是在突出目标地物的空间结构和纹理特征情况下的信息融合。在数字图像小波多分辨率分析理论基础上,采用小波变换方法对高分辨遥感图像的目标地物边缘进行信息增强,然后与多光谱遥感图像进行特征信息融合。在融合过程中,首先对多光谱图像中的R、G、B三个波段的图像进行小波分解,得到相应的低频图像,然后对特征增强后的高分辨率图像进行小波分解,再将分解后的高频图像分别与低频图像进行融合,最后经RGB合成为彩色图像。该方法既改善了图像的清晰度和分辨率,同时也保留了原图像的光谱信息。通过融合实验验证了上述结论。 相似文献
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结合人眼视觉特性,设计了一种方向Gabor滤波器,该滤波器顾及了纹理图像的方向特性;利用Gabor滤波器的带通技术,抑制次要纹理图像的主频率分量,增强目标纹理图像主频率分量,使滤波输出图像具有较大的类间离散度和较小的类内离散度,将纹理图像的分割转化为传统的图像分割,使图像的分割质量和算法效率都得到了提高。 相似文献
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从文本图像中提取局部特征来进行文字种类识别,对图像的质量要求较高,而提取文本图像的整体特征进行识别,则能够克服了这个问题.分析中、英文文本图像的纹理特征,通过Gabor滤波器分析提取全局特征,再用支持向量机的方法进行文种分类识别.实验结果表明,该方法可以很好地区分含噪文本图像中的中文和英文. 相似文献
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由于在频域用能量参数来表示图像的特征矢量缺乏准确性,而且实数离散小波变换具有平移变化性和弱的方向选择性,为此针对以上问题提出了一种基于复数小波域广义高斯分布模型的纹理图像检索方法。该方法首先利用双树复数小波变换系数的统计特性来建立广义高斯分布的统计模型;然后基于该模型提取图像的特征矢量;最后利用KullbackLeibler distance(KLD)测度算法进行纹理图像检索。对Brodatz图像库的仿真表明,新方法较双树复数小波算法的查准率提高6.96%,较基于Gabor纹理特征检索法的查准率提高了18.8%。同时复数小波系数统计模型具有旋转不变性。新方法对今后的纹理图像检索具有重要的理论与实际意义。 相似文献
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由于在频域用能量参数来表示图像的特征矢量缺乏准确性,而且实数离散小波变换具有平移变化性和弱的方向选择性,为此针对以上问题提出了一种基于复数小波域广义高斯分布模型的纹理图像检索方法。该方法首先利用双树复数小波变换系数的统计特性来建立广义高斯分布的统计模型;然后基于该模型提取图像的特征矢量;最后利用Kullback-Leibler distance(KLD)测度算法进行纹理图像检索。对Brodatz图像库的仿真表明,新方法较双树复数小波算法的查准率提高6.96%,较基于Gabor纹理特征检索法的查准率提高了18.8%。同时复数小波系数统计模型具有旋转不变性。新方法对今后的纹理图像检索具有重要的理论与实际意义。 相似文献