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红外图像边缘检测的循环移位算法 总被引:2,自引:0,他引:2
提出一种基于Bezier曲线的红外图像边缘检测的循环移位算法。为抑制红外图像中的噪声的影响,利用Bezier曲线法平滑图像灰度直方图中的噪声,得到Bezier直方图。利用提出的“循环移位法”探测Bezier直方图曲率曲线的极大和极小值,确定分割阈值和量化灰度值,实现对原始红外图像的分割,对分割后的图像进行边缘检测。实验结果表明,新算法简单有效,在准确检测红外图像边缘信息的同时又能抑制图像中噪声的影响,定位精度高,而且能够得到单像素边缘,在性能上优于传统的几种边缘检测算子。 相似文献
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基于变差函数的噪声图像的多尺度边缘检测 总被引:1,自引:0,他引:1
基于区域化变量理论,针对受噪声污染的图像,本文提出了一种基于变差函数的多尺度边缘检测新方法.该方法根据图像各个不同区域的数据的不同方向的变差函数值来判断该区域是否存在边缘以及边缘的方向性,然后根据该区域边缘的方向性,在水平和垂直方向分别进行不同尺度的小波变换,进而达到在确保边缘定位准确的同时,尽最大可能去除由于噪声以及图像灰度不均匀产生的伪边缘点.仿真实验表明,本文算法在对受高斯白噪声污染较严重的图像进行边缘检测时能有效的去除噪声对图像边缘检测的影响,从而证明了该方法的可行性、有效性. 相似文献
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本文提出了一种快速抗噪声的边缘检测算法.首先对原始灰度图像应用快速Kirsch边缘检测算法.这样就得到了边缘的梯度和方向信息.然后基于这些信息进行边界跟踪,达到抗噪的效果,最后是细化和二值化,得到的是一个视觉上有意义的二值图像.用的是一个投票准则.为了检验本算法的有效性,将本算法与一些经典的边缘检测算子,如经典的Kirsch,Canny算子的性能进行了比较. 相似文献
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提出了一种新颖简单的虹膜内边缘(瞳孔)定住算法.此算法分别对虹膜图像的每一行进行处理.首先,采用一种简单的齿形变换对虹膜图像每一行的灰度曲线进行变换,变换后的灰度曲线为齿形并且虹膜内边缘点出现在齿形曲线的转折点处.然后,根据在虹膜内边缘点处齿形灰度曲线的斜率由负值变为正值的特点。检测虹膜内边缘点并定住虹膜内边缘的位置.此算法具有新颖、简单、准确和速度快等特点. 相似文献
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基于神经网络的图像边缘检测方法 总被引:4,自引:3,他引:4
提出了一种基于神经网络的图像边缘检测新方法.该方法首先基于邻域灰度极值提取边界候选图像,然后以边界候选象素及其邻域象素的二值模式作为样本集,输入边缘检测神经网络进行训练.边缘检测神经网络采用BP网络,为加快网络的训练速度,采用了滚动训练和权值随机扰动的方法.实验表明,该方法提高了神经网络的学习效率,获得的边缘图像封闭性好,边缘描述真实. 相似文献
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空间二次曲线射影重建计算方法研究 总被引:1,自引:0,他引:1
利用二次曲线上点和直线的对应以及利用二次曲线光流对二次曲线进行解释,需要寻求多元方程组的最优解,计算过程较为复杂。将空间二次曲线表示为一个空间二次曲面和一个平面的交线,提出了一对对应二次曲线存在两个独立的多项式条件;利用两个二次曲面的基曲线推导出二次曲线重建的两个对应条件,在此基础上,给出了空间二次曲线射影重建的计算方法和计算步骤。实验验证表明该算法实用和可靠。 相似文献
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Previously described scattering based edge distortions in optical density scans obtained from a neutron radiographic knife-edge image have been here confirmed using analog Monte Carlo simulation. In an attempt to estimate the effects of additional object scatter on such artifacts, the effect on the edge response of diffusely incident neutrons has been determined both empirically and by Monte Carlo simulation. The diffuse neutron incidence has been found to diminish the relative magnitude of the distortion, offering explanation for the infrequent observation of the corresponding edge scattering halo artifacts. The potential of this edge distortion as a diagnostic indicator of the buildup factor in radiography is suggested and examined. 相似文献
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In accordance with the extended Huygens–Fresnel principle, the evolution of linear edge dislocation propagating through atmospheric turbulence is studied, and the effects of waist width and the slope of linear edge dislocation are investigated. It is shown that when linear edge dislocation beams propagate through atmospheric turbulence, if the waist width is not equal and the slope is not zero, then the linear edge dislocation vanishes and transforms into an optical vortex with a topological charge of ?1 or +1. The optical vortex and an optical vortex that is created annihilate when the transmission distance is far enough. The linear edge dislocation vanishes when the slope is zero. If the waist width is equal, then the linear edge dislocation will vanish regardless of the slope value. For linear edge dislocation beams in free space, when selecting specific parameters, linear edge dislocation always exists. 相似文献
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Peihua Du Bin Xue Yihu Song Min Zuo Shengjun Lu Qiang Zheng Jie Yu 《Journal of Materials Science》2010,45(11):3088-3095
The morphology of conic markings was observed on the fracture surfaces of amorphous polysulfone, polyethersulfone and polyetherimide
and semicrystalline polypropylene, polyphenylene sulfide and polybutylene terephthalate by using scanning electron microscopy.
Most of conics exhibit the stepped stereo configuration, and the origin of secondary crack is depressed in the crack plane
as a result of plastic deformation. The brittle–ductile transition of polymers can be analyzed by comparing the matching morphology
of conic markings. According to computer simulations, the type I marking is determined by the ratio of the main to the secondary
crack velocity while the type II marking is determined by the distances that two secondary cracks have covered before they
meet. Variations of conic shapes can help to determine the changes of crack growth velocity. 相似文献
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本文依据标准的单模光纤模场直径(MFD)刀口测量方法,提出了一种新颖独特的双刀口法测量方案并在实验室实现.此方法最突出的优点是:测量操作方便,简洁,可以实现全自动,测量精度相当高. 相似文献
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Kuo‐Cheng Liu 《International journal of imaging systems and technology》2009,19(4):332-339
Color‐edge detection is an important research task in the field of image processing. Efficient and accurate edge detection will lead to higher performance of subsequent image processing techniques, including image segmentation, object‐based image coding, and image retrieval. To improve the performance of color‐edge detection while considering that human eyes are ultimate receiver of color images, the perceptually insignificant edges should avoid being over‐detected. In this article, a color‐edge detection scheme based on the perceptual color contrast is proposed. The perceptual color contrast is defined as the visible color difference across an edge in the CIE‐Lab color space. A perceptual metric for measuring the visible color difference of a target color pixel is defined by utilizing the associated perceptually indistinguishable region. The perceptually indistinguishable region for each color pixel in the CIE‐Lab color space is estimated by the design of an experiment that considers the local property due to local changes in luminance. Simulation results show that the perceptual color contrast is effectively defined and the color edges in color images are detected while most of the perceptually insignificant edges are successfully suppressed through the proposed color‐edge detection scheme. © 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 332–339, 2009 相似文献