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1.
Most existing methods for image copy-move forgery detection(CMFD)operate on grayscale images. Although the keypoint-based methods have the advantages of strong robustness and low computational cost, they cannot identify the flat duplicated regions without reliable extracted features. In this paper, we propose a new CMFD method by using speeded-up robust feature(SURF)in the opponent color space. Our method starts by converting the inspected image from RGB to the opponent color space. The color gradient per pixel is calculated and taken as the work space for SURF to extract the keypoints. The matched keypoints are clustered and their geometric transformations are estimated. Finally, the false matches are removed. Experimental results show that the proposed technique can effectively expose the duplicated regions with various transformations, even when the duplication regions are flat. 相似文献
2.
由于中国特殊的历史背景、制度构架、文化传统、发展阶段等使劳资矛盾呈现出一种独特的表现形态。现阶段我国劳资矛盾表现出凸显与扩散的特性,日益显性化和常态化,并由生存型向发展型劳资矛盾扩展和生长,且矛盾诉求形式外溢,由企业内部向社会扩散。与此同时劳资矛盾还出现了偏离与异化现象,衍生出更为复杂社会矛盾,如族群矛盾、劳政矛盾、本地人－外地人矛盾、地域矛盾以及由非直接利益相关的敌恶势力操纵和控制的外源性矛盾等。劳资矛盾的这一系列新特征也带来新的社会风险和危机。 相似文献
3.
检测数字图像复制—粘贴型篡改是目前研究热点之一。多数复制—粘贴篡改检测方案只对刚性平移篡改具有较好的检测精度,无法有效应对更复杂的几何变换和常规信号攻击。为优化数字图像复制—粘贴篡改检测效率和精度,首次提出一种使用极坐标复指数变换（PCET）与一致性敏感哈希（CSH）的高效检测算法。首先,计算滑动窗口 PCET 系数,将其作为不变的图像局部特征|然后,根据这些特征,利用 CSH 算法快速、精确地匹配大量密集分块|最后,使用基于密集线性滤波的后处理算法消除匹配结果中的错误匹配并定位重复区域,得到最终检测结果。根据实验结果可知,该算法不仅检测精度平均提高 12.06%,而且处理时间平均缩短315.64s。因此利用对几何变换和常规信号攻击鲁棒的 PCET 系数刻画图像局部特征,并采用基于图像一致性的快速高精度匹配算法 CSH,可有效优化复制—粘贴篡改检测精度和效率。 相似文献
4.
A color-intensity feature extraction method is proposed aimed at supplementing conventional image hashing algorithms that only consider intensity of the image. An image is mapped to a set of blocks represented by their dominant colors and average intensities. The dominant color is defined by hue and saturation with the hue value adjusted to make the principal colors more uniformly distributed. The average intensity is extracted from the Y component in the YCbCr space. By quantizing the color and intensity components, a feature vector is formed in a cylindrical coordinate system for each image block, which may be used to generate an intermediate hash. Euclidean distance is modified and a similarity metric introduced to measure the degree of similarity between images in terms of the color-intensity features. This is used to validate effectiveness of the proposed feature vector. Experiments show that the color-intensity feature is robust to normal image processing while sensitive to malicious alteration, in particular, color modification. 相似文献
5.
A new kind of region pair grey difference classifier was proposed. The regions in pairs associated to form a feature were not necessarily directly-connected, but were selected dedicatedly to the grey transition between regions coinciding with the face pattern structure. Fifteen brighter and darker region pairs were chosen to form the region pair grey difference features with high discriminant capabilities. Instead of using both false acceptance rate and false rejec- tion rate, the mutual information was used as a unified metric for evaluating the classifying performance. The parame- ters of specified positions, areas and grey difference bias for each single region pair feature were selected by an opti- mization processing aiming at maximizing the mutual information between the region pair feature and classifying dis- tribution, respectively. An additional region-based feature depicting the correlation between global region grey inten- sity patterns was also proposed. Compared with the result of Viola-like approach using over 2 000 features, the pro- posed approach can achieve similar error rates with only 16 features and 1/6 implementation time on controlled illumi- nation images. 相似文献
6.
我国已进入工业化中期阶段,在一定程度上具备了以工促农,以城带乡的经济基础。由于安徽省地区经济发展区域差异显著,各地区的经济发展水平、地形地貌不同。其村庄建设的内容、重点、模式和方式上也都不同。基于此,以村庄分布特征、地形地貌特征、村庄发展阶段为视角,以县（市）域为单位,将安徽省的村庄分布划分为五个特征区域;结合安徽省的分区城乡统筹模式,提出各特征地区村庄发展的优化策略。 相似文献
7.
柯程扬刘丽桑 《福建工程学院学报》2021,(6):568-573
为了能对金线莲品系进行方便准确地识别,提出基于PCA￣KNN 的金线莲叶片识别方法。通过图像预处理,获得特征较为明显的叶片区域,再提取纹理和颜色特征,进行特征融合,然后采用PCA降低特征维度,提高识别精度,最后通过训练KNN 分类器完成分类。以3 个品系的金线莲为例进行鉴别试验,结果表明,提出的识别方法与其它方法相比,正确识别率更高,达到98.4%,能准确识别不同种类的金线莲。 相似文献
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9.
周健 《大连教育学院学报》2005,21(1):43-44
恰到好处的雷雨环境描写是《雷雨》第三幕戏的一大特色。本幕中雷雨环境描写对衬托人物心理状态、推动情节发展、加剧戏剧冲突产生了极大的功效和强烈的艺术魅力。 相似文献
10.
袁建群 《泰州职业技术学院学报》2007,7(1):75-78
在我国向市场经济转轨过程中,出现很多会计信息失真的情况,会计监督存在着严重的问题,要加强和完善会计监督职能,必须从加强法律体系建设、建立健全企业内部会计监督机制、加强单位领导人的监督责任、加强外部监督、培养高素质的会计人才等几方面着手。 相似文献
11.
A non-local denoising （NLD） algorithm for point-sampled surfaces （PSSs） is presented based on similarities, including geometry intensity and features of sample points. By using the trilateral filtering operator, the differential signal of each sample point is determined and called ＂geometry intensity＂. Based on covariance analysis, a regular grid of geometry intensity of a sample point is constructed, and the geometry-intensity similarity of two points is measured according to their grids. Based on mean shift clustering, the PSSs are clustered in terms of the local geometry-features similarity. The smoothed geometry intensity, i.e., offset distance, of the sample point is estimated according to the two similarities. Using the resulting intensity, the noise component from PSSs is finally removed by adjusting the position of each sample point along its own normal direction. Experimental results demonstrate that the algorithm is robust and can produce a more accurate denoising result while having better feature preservation. 相似文献
12.
我们通常感兴趣的是所观察图像的一部分区域或者几部分区域中的内容,而非整幅图像中的信息,本文提出了一种改进的基于感兴趣区域(ROI)的数字水印嵌入算法。该算法采取Itti模型,直接对原图像进行ROI区域提取,并将区域矩形化,针对彩色图像三个通道RGB的不同特性,分别从空间域和变换域进行水印嵌入。仿真实验表明,所提出的水印嵌入算法能够有效抵御裁剪攻击、旋转攻击、缩放攻击、JPEG压缩攻击,而且对锐化、噪声、低通滤波等操作具有较好的鲁棒性。 相似文献
13.
A non-local denoising (NLD) algorithm for point-sampled surfaces (PSSs) is presented based on similarities, including geometry intensity and features of sample points. By using the trilateral filtering operator, the differential signal of each sample point is determined and called "geometry intensity". Based on covariance analysis, a regular grid of geometry intensity of a sample point is constructed, and the geometry-intensity similarity of two points is measured according to their grids. Based on mean shift clustering, the PSSs are clustered in terms of the local geometry-features similarity. The smoothed geometry intensity, i.e., offset distance, of the sample point is estimated according to the two similarities. Using the resulting intensity, the noise component from PSSs is finally removed by adjusting the position of each sample point along its own normal direction. Experimental results demonstrate that the algorithm is robust and can produce a more accurate denoising result while having better feature preservation. 相似文献
14.
为了提高园林三维景观绿化廊道空间规划能力,需要进行空间可视化分割,提出基于锐化模板匹配的园林三维景观绿化廊道空间可视化分割方法,构建园林三维景观绿化廊道视觉图像的稀疏表示模型,采用分块模板匹配方法进行园林三维景观绿化廊道视觉图像的边缘轮廓特征分解,提取园林三维景观绿化廊道视觉分布特征量,结合锐化模板特征匹配的方法进行园林三维景观绿化廊道空间区域重构,建立园林三维景观绿化廊道空间三维视景仿真模型,采用可视化的视觉重构和特征提取方法,进行园林三维景观绿化廊道空间可视化分割。仿真结果表明,采用该方法进行园林三维景观绿化廊道空间可视化分割的自适应性较好,特征分辨能力较强,提高园林三维景观绿化廊道的设计效果。 相似文献
15.
1IntroductionIntrusion detection systems(IDS)can be catego-rizedinto two types bytheir detection algorithms:mis-use detection and anomaly detection.Misuse detectiondefines known attack signatures(using expert know-ledge),and tries to find the ones that ma… 相似文献
16.
随着全球高等教育质量保障运动的不断发展,建立与完善高等院校的内部质量保障机制已成为许多国家保证教育质量、提高社会声誉、增强国际竞争力的重要手段.本文通过分析北欧高校内部质量保障的特点,着重介绍芬兰赫尔辛基大学的内部保障体系,以及赫尔辛基大学最新内部教学质量评估标准制定的理念,旨在为我国高校内部质量保障机制的建设与发展提供借鉴和参考. 相似文献
17.
5 experiments investigated children's intuitions about genetic transmission of features. After parent animals possessing an abnormal feature were described, children were asked whether their baby would be born with that feature in abnormal or normal form. Features were either internal or external, inborn or acquired after birth, and had functional or nonfunctional consequences for the parents. Among preschoolers, features with functional consequences were considered inherited much more frequently than any other type, but only when the functional consequences were biological rather than social or psychological. Older children demonstrated more awareness of the inheritance of inborn traits. Overall, the results suggest young children have principled, specifically biological notions of inheritance. 相似文献
18.
我国地方税收竞争的博弈分析及其政策启示 总被引：2，自引：0，他引：2
杨伊 《江西教育学院学报》2007,28(1):25-29
改革开放以后,随着经济的快速增长和结构的不断调整,我国政治经济制度急需实现转型,财政分权的程度不断深化,地区间经济竞争也日趋加剧。这一切都使有效的政府间税收竞争成为现实需要。文章运用一系列实证研究的方法来论证如何构建一种充分发挥地方税收竞争有效性的秩序框架,并在此基础上提出一些政策建议。 相似文献
19.
唐宋时期家族组织的变化 总被引：1，自引：0，他引：1
邢铁 《河北师范大学学报(哲学社会科学版)》2008,31(6):119-125
唐代以前的家族组织以北方政治型的世家大族为主要形态,宋代以后血缘型的家族组织成了普遍形态。并且主要存在于东南地区。两个阶段上的家族组织各有其特征。就变化的原因来看．主要是家庭组织自身发展的结果。 相似文献
20.
A hybrid neural network system for prediction and recognition of promoter regions in human genome 总被引：1，自引：0，他引：1
INTRODUCTION The publication and preliminary analysis of thehuman genome sequence (Lander et al., 2001; Venteret al., 2001) marks a significant milestone in the fieldof molecular biology. One of the main goals of theHuman Genome Project is the characterization, an-notation?recognition and categorization of genesfrom human genome to serve as a periodic table forbiomedical research (Lander, 1996). In the past fewyears, many efforts have been devoted to gene anno-tations. The Nation… 相似文献