共查询到20条相似文献，搜索用时 62 毫秒
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由于传统方法没有充分考虑加性噪声对图像处理效果的影响,导致去模糊处理后图像易丢失细节信息,峰值信噪比较小以及图像清晰度较差的问题.为此提出基于稀疏约束的离焦图像多尺度去模糊方法.通过建立观测模型,判断图像斑点位置,消除离焦图像中因噪声引起的序列斑点,降低加性噪声的影响程度.进而分离离焦图像中的前景聚焦和离焦背景区域,提取出离焦图像的深度图.最后通过稀疏约束获取模糊核,并运用该模糊核实现对离焦图像的去模糊处理.实验结果表明,所提方法在图像细节保留、清晰度提升和峰值信噪比方面均具有优越性,有效提升了图像的感官效果. 相似文献
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提出一种基于DCT域的图像自适应盲水印算法.该算法利用视觉系统HVS特性和图像的局部特点,自适应地选择嵌入强度对载体图像各个分块的部分低频系数和直流系数嵌入水印,综合了交流分量和直流分量的嵌入优势,使水印的稳健性和不可见性达到较好的平衡.水印的提取不需要原始图像参与.实验结果表明该算法实现的水印具有良好的不可见性,并对常见的图像处理和噪声干扰具有很好的稳健性. 相似文献
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在蒙版中进行图像处理,能迅速地还原图像,避免在图像处理中丢失图像信息.同时,它还能将不同灰度色值转化为不同的透明度,使受其作用图层上的图像产生相对应的透明效果,并且使在图片融合、特殊效果、建立复杂的选择区上更加方便,也能对部分不处理的图像起到保护作用. 相似文献
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刘彩霞 《常熟理工学院学报》2009,23(2):118-121
梯度矢量流模型广泛应用于计算机视觉与图像分割,但是受噪声的影响,在处理许多医学图像时不能正确收敛到目标轮廓．本文结合小波变换与梯度矢量流模型提出了一种新的动态轮廓模型．新模型定义小波变换矢量替代梯度矢量,并用多尺度小波变换对图像进行预处理．新模型具有更好的抗噪性,并能够得到连续的边缘点．结果表明新模型提高了动态轮廓模型方法分割复杂图像的能力,是一种有效的医学图像分割方法． 相似文献
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针对高分辨率遥感图像的特点,在充分考虑图像的空间几何特征和图像像元间相关性的基础上,提出了一种融合的图像拼接处理算法.经该算法处理后的拼接图像很好地保留了地物的几何特征和波谱信息,且重叠区域过渡自然,更有利于遥感图像的后期处理、分析和应用. 相似文献
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图像分割技术在昆虫识别中的应用 总被引：1，自引：0，他引：1
以浙江省66种重大检疫性害虫为研究对象,采用Otsu算法实现昆虫图像的分割,取得了较好的效果.首先对昆虫图像进行灰度化处理,加快分割速度,再对灰度图像进行中值滤波,去除大部分噪声,最后,用Otsu算法对灰度化和中值滤波后的昆虫图像进行分割.针对存在的不足,运用数学形态学方法进行修正.首先利用数学形态学中的膨胀和腐蚀运算对昆虫图像进行增强,然后运用Otsu算法对图像进行分割.实验结果表明,将Otsu算法与数学形态学方法结合起来能够有效地提取昆虫图像. 相似文献
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聚类分析在涉及多维数据分析或处理的学科中都是很普遍的。由于计算机视觉领域中的图像分割经常表示成一个聚类问题,所以聚类方法在模式识别、图像处理、信息检索中的应用越来越受关注。结合采样技术、分块技术及数据压缩技术,研究了层次聚类算法在图像处理中的应用。 相似文献
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武英 《南京晓庄学院学报》2010,26(3):85-87
文章提出了一种改进双直方图均衡算法,根据图像的熵和输入输出图像的亮度均值差,自适应的选择合适的阈值将图像分割成两个子图,进行均衡处理和灰度均匀化处理,使得输出图像的亮度均值和原图像接近的同时视觉效果达到最好.实验结果证明了该处理方法能取得较好的增强效果. 相似文献
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在合成孔径雷达(synthetic aperture radar,SAR)图像中,受斑点噪声的影响,边缘、纹理、细小目标等细节信息容易被腐化。对于处理这一复杂问题,提出了一种新颖的各向异性扩散模型。该方法设法达到一种相互矛盾的目标:去除同质区域噪声的同时,保存弱的边缘,以及更有效的保持强的目标信息。并通过与其他两种方法同时作用于Lena的乘性噪声图像和一个真实的SAR图像来做比较,证明该方法的有效性。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献