13 research outputs found

    Fast local binary fitting optimization approach for image segmentation

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    针对灰度不均匀图像难以正确分割和分割结果依赖于初始轮廓的问题,提出一种快速稳定的分割算法,首先通过自适应距离保持水平集演化(AdPlS)算法进行初始分割以获取较好的初始轮廓,然后采用局部二值拟合(lbf)模型进行快速分割。实验表明,改进后的模型有良好的分割效果,较好地解决了分割速度、精度及稳定性之间的矛盾。It is difficult to get the correct segmentation results for the intensity inhomogeneity images,and the segmentation results are very sensitive to the initial contours.Thus,a fast and stable approach was proposed to overcome these disadvantages.First,an Adaptive Distance Preserving Level Set(ADPLS) method was utilized to get a better initial contour.Second,the Local Binary Fitting(LBF) model was used for a further segmentation.The experimental results show that the improved model can achieve good performance and is better to solve the contradiction among the segmentation speed,accuracy and stability.南京军区重点项目(11Z023); 福建省自然科学基金资助项目(2008J0312

    Improved Method for Fuzzy C-Means Clustering Algorithm

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    由于传统的模糊C均值(fuzzy C-MEAnS,fCM)算法没有考虑像素点的空间邻域信息,仅涉及像素的单点灰度,在处理含有噪声的图像时有很大的局限性,因此分割效果较差。针对fCM的缺陷,提出一种新的改进算法,该算法引入gIbbS随机场,将gIbbS随机场先验概率与像素点隶属度的乘积作为新的像素隶属度。实验表明,改进后的算法有良好的分割效果,既可以较为完整地保留图像边界细节,又能较好地去除图像的噪声。The traditional fuzzy C-means (FCM) algorithm has great limitations in dealing with the noisy images owing to not considering the spatial information of the pixels and only involving the pixel gray of a single point,so it's poor in segmenting an image.For the defects of the FCM algorithm,a new improved algorithm is proposed in this article,in which a product of Gibbs priori probability and the membership is regarded as the new pixel membership.Experimental results show that the improved algorithm has a good segmentation result;it can retain more complete edge details of image and can remove the image noise more effectively.南京军区重点项目(项目编号:11Z023); 福建省自然科学基金项目(项目编号:2008J0312

    Improvement of Segmentation Correction Model Based on Local Features

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    基于局部特性的分割校正模型能够在图像分割的同时实现对非均匀场的校正,从而对灰度不均匀图像有较好的分割效果,然而,该模型具有局部特性,且采用多相分割,使得活动轮廓曲线对初始位置较为敏感,且分割速度较慢。针对该不足,通过引入自适应距离保持水平集算法,采用分割校正模型与自适应距离保持水平集相结合的方法,提出一种新的快速分割算法。实验结果表明,该算法可摆脱初始轮廓的限制,避免在分割灰度不均匀图像时边缘泄漏和分割不足现象,并且具有分割快速的特点。Segmentation correction model based on local features can implement the correction of intensity inhomogeneity images,for which has better segmentation effect,but with the local features of the proposed model,and using multiphase segmentation,so that it is sensitive to the initial position of the active contour curve and the segmentation is slow.Aiming at the shortage,a new fast segmentation algorithm is proposed by introducing Adaptive Distance Preserving Level Set(ADPLS) algorithm,combining the segmentation correction model and adaptive distance preserving level set method.Experimental results show that the improved algorithm not only gets rid of the influence of the initial contour,but also avoids the edge leakage and segmentation shortage phenomenon,maintains the fast segmentation.福建省自然科学基金资助项目(2008J0312

    The research of image segmentation algorithm based on fuzzy c means clustering method

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    图像分割是图像处理和计算机视觉研究领域中的一个经典问题,是图像处理过程中一个极为重要的环节。也是实现图像处理到图像分析之间的关键步骤。目前,图像分割技术已被广泛应用到多个领域,如计算机视觉、模式识别、医学图像处理、航空航天以及卫星遥感等。 聚类分析作为一种非监督聚类方法,是指将物理或抽象对象的集合分组成为由类似的对象组成的多个类的分析过程,是机器学习领域中的一个重要方向。所谓聚类就是将没有类别标记的样本集按某种准则划分成若干类,使类内样本的相似性尽可能大,而类间样本相似性尽可能小。聚类分析的研究主要以聚类算法为主,聚类算法是有一种有效的图像分割算法,也是目前较常用的分割算法。由于图像本身存在...Image segmentation is a classic problem in image processing technology and computer vision. And it is an important link in image processing and is the key step from image processing to image analysis. At present, it has been widely applied on a lot of fields, such as computer vision, pattern recognition, medical image processing, aerospace technology and satellite remote sensing technology and so ...学位:工学硕士院系专业:信息科学与技术学院_计算机应用技术学号:2302010115308

    一种用于非均匀等离子体射流的双探针、诊断方法及系统

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    本发明公开了一种用于非均匀等离子体射流的双探针、诊断方法及系统,方法包括如下内容:双探针的两根金属电极包裹于非均匀等离子体射流内,通过改变串接在所述双探针上的扫描电压的大小,采集每个扫描电压下所述双探针内的电流,根据扫描电压和对应的电流拟合I-V曲线,根据所述I-V曲线的参数得到超声速非均匀等离子体射流的特征参数。本发明还公开了应用于该方法的系统及双探针的结构,本发明提供的双探针、诊断方法及系统,能够适用于超声速非均匀等离子体射流,通过测量扫描电压和对应电流数据,无需微分计算就能够得到超声速非均匀等离子体射流的特征参数,解决了超声速流动下等离子体非均匀性的特征测量问题

    大渡河上游不同地带居民对环境退化的响应

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    青藏高原的环境退化引起了极大的关注,但农牧民如何认识和响应环境退化,还缺乏实证研究。采用参与性农村评估法,对大渡河上游不同地带典型村(位于河谷区的丹扎木村、中山区的克尔马村和山原区的日科村)的农牧民进行调查和对比分析。研究表明:①大渡河上游不同地带的居民对环境退化具有不同的响应过程。河谷区通过劳动力向二、三产业转移,缓解了人口压力,采取积极的措施来应对自然灾害和森林退化;中山区以劳动力向二、三产业转移和发展畜牧业来缓解人口压力,没有采取积极的措施应对环境退化;山原区的劳动力不能转移到二、三产业,只能通过增加牲畜数量来解决生计,牧民仅采取一些积极的措施来应对草料不足的问题和雪灾等自然灾害。在大渡河上游,最脆弱的区域是中山区和山原区,而不是人口压力大的河谷区。②生计方式是影响居民响应人口压力和环境退化的关键因素。基于居民的生计方式来解释和解决生态脆弱区的人口压力和环境退化问题,将是一个新的方向。③劳动力向二、三产业转移有利于居民改善生计。降低教育收费和进行基础设施建设,将加快劳动力向二、三产业转移

    小秦岭文峪花岗岩山体的隆升时代和幅度

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    Global Dimming Algorithm Based on Image Classification

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    应变自组装InAlAs量子点材料和红光量子点激光器

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    通过提高量子点材料的质量和优化量子点激光器材料的结构,研制出高质量的应变自组装InAlAs/AlGaAs/GaAs量子点材料和低温连续激射的红光量子激光器。器件性能达到国际同类研究的最好水平
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