共查询到20条相似文献，搜索用时 46 毫秒
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本文通过分析作为一阶梯度算子的理论基础,得出可应用到实践图像分割中的一阶微分算子、并通过VC＋＋6．0加以实现。分析图像分割结果,并对Robert算子,Sobel算子和Prewitt边缘检测算子进行了利弊分析。 相似文献
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在图像分析与计算机视觉领域中,图像分割技术应用很广,它是一个基础的并且非常重要的课题。现如今,关于变分模型的图像分割方法得到了国内外学者的广泛关注。本文将要讨论图像分割的变分模型与数值计算,主要提出一种快速求解Mumford-Shah模型的变分水平集分割方法和C-V模型。 相似文献
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倪波 《黄冈职业技术学院学报》2012,(1):90-92
图像分割是医学图像分析中的重要问题。以前的基于模型的分割算法都是从不特定人群的统计出模型的先验知识。文章提出了一种新的全自动医学图像分割算法.这种方法旨在提出一种基于特定人先验轮廓模型。该模型通过基于流形的学习方法,从而达到更加准确的分割效果。 相似文献
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张伟周利君夏坚 《福建工程学院学报》2021,(4):330-334
针对传统Canny算子进行图像边缘检测时对非线性噪声效果不太明显且会存在漏检的问题,提出了一种改进的Canny算子,将其应用于建筑裂缝边缘提取中。对建筑裂缝图像进行预处理,在预处理阶段对图像进行分割与去除孤立点的操作,以得到更为清晰的图像。利用非线性中值滤波代替原Canny算子中的高斯滤波,用Sobel算子八方向模板进行梯度计算,并使用Otsu法得到阈值。与传统方法相比较,提出的方法能够提取出更清晰完整的图像边缘,其峰值信噪比与结构相似性均有一定程度的提高。 相似文献
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序列图像分割是医学图像三维重建的重要研究内容,但受成像技术限制,医学图像中往往包含大量低频信息,如偏移场、灰度不均等,影响分割准确性。从频域进行图像分割能有效避免低频信息干扰。在高频能量最小化分割模型基础上进行优化,设计了一种自动初始化水平集的分割模型并成功应用于三维分割领域。首先,使用形态学腐蚀方法进行粗分割,将提取出的三维曲面作为初始水平集,实现初始水平集轮廓面自动化;然后使用衍化后的水平集三维分割模型对其进行细分割。实验结果表明,采用该模型能够实现多目标分割,与原模型、Chan Vese模型相比,分割结果更加准确。 相似文献
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为了提高图像分割质量,分析了RGB颜色模型下3种颜色分量对花卉图像分割结果的影响。根据花卉目标的颜色特征,在RGB颜色模型下分别提取花卉图像的R分量、G分量、B分量,采用FCM算法分别对3个分量进行图像分割,并对十多幅自然场景下拍摄的不同颜色花卉图像进行分割实验。结果表明,针对合适的色彩分量进行图像分割可以获得更好的分割效果。 相似文献
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边缘是图像最重要的特征之一,其检测的好坏对图像的识别和分割的效果有直接的影响,本文探讨了传统的Prewitt算子和灰色关联度在边缘检测中的应用情况,提出并实现了一种将Prewitt算子和邓氏关联度相结合的边缘检测方法。实验表明,该方法提取的边缘较完整、连续性好、非边缘点少,为图像边缘检测探索了一种新的途径和方法。 相似文献
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传统的主动轮廓模型只利用图像的边缘或者只利用区域特征实现图像分割。在有些情况下图像分割效果较差．本文给出了一种综合利用图像边缘和区域特征的主动轮廓图像分割方法．实验表明,演变后的曲线与图像的边缘是吻合的,图像分割的结果较好．而对相同的图像应用传统的主动轮廓分割算法得到的图像分割结果则很差．这说明新算法明显提高了传统算法的图像分割性能． 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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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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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 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