共查询到20条相似文献,搜索用时 203 毫秒
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基于边缘保持滤波的Canny彩色图像边缘检测方法 总被引:1,自引:0,他引:1
提出了基于边缘保持滤波的Canny彩色图像边缘检测方法。该方法利用了HSV颜色空间信道相关性低的优点,结合Canny算子定位准确的优点和边缘保持滤波理论,用边缘保持滤波取代传统的高斯滤波,用梯度矢量计算法替代传统的梯度标量计算法,从而增强了在平滑过程中对图像边缘的保持,最大程度保留了色彩的差异信息,实现了彩色图像边缘的自适应提取。实验结果证明,该方法将灰度空间的Canny算法推广到彩色矢量空间,充分利用了彩色信息,对彩色图像边缘提取具有较好的检测精度和准确度。 相似文献
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彩色图像边缘检测改进算法 总被引:3,自引:0,他引:3
介绍了梯度的概念和度量方法,分析了常用梯度算法,对其中的Sobel算子进行改进,从灰度算法改进到RGB三维空间,提出了一种针对彩色图像的边缘检测算法.本算法在Delphi平台上实现,与同类算法做了多次实验对比.实验证明,该算法能有效增强彩色图像的边缘,耗时较少,经过封装后可以直接用于二值图像、灰度图像和彩色图像,具有一定的通用性和实用价值. 相似文献
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一种基于最小交叉熵的canny边缘检测算法 总被引:1,自引:0,他引:1
考虑传统Canny算子在边缘检测中的不足,提出一种融入最小交叉熵的Canny边缘检测算法.传统Canny算子的高低阈值一般人为地设定固定值,当一幅图像的灰度级集中在某一区域时,容易造成虚假边缘;利用最小交叉熵计算图像的高低阚值,可以得到理想的阈值;利用图像灰度的均值和方差计算Canny算子的高斯滤波参数.实验结果表明,算法较好地提取了图像的边缘信息,抑制噪声能力较强,有效地提高了边缘检测的鲁棒性. 相似文献
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基于Canny算子的边缘提取改善方法 总被引:23,自引:1,他引:22
通过对Canny算法进行改进,提出一种对原图像开窗统计后再进行局部灰度变换的方法。该算法改善了Canny算法对灰度分布不均匀的图像进行边缘检测的效果,并与传统Canny算法进行了比较,试验结果证明了该算法能有效改善灰度分布不均匀图像的边缘检测效果。 相似文献
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针对左聚焦和右聚焦彩色图像的融合问题,设计了一种基于边缘检测的彩色图像融合算法。首先将彩色图像转换为NTSC图像,再利用Canny方法检测出亮度信息图像的最优边缘,然后对亮度信息图像的边缘部分采用平均法进行融合,其余部分采用相关系数的权值法进行融合,最后将融合之后的饱和度图像、亮度图像和色调图像转换为彩色图像。从融合效果来看,文中算法能够将两幅左右聚焦的彩色图像融合成一幅信息量饱满且清晰的单一聚焦彩色图像。实验结果和信息熵客观评价结论表明,该彩色融合算法能够将信息熵提高2.13%~2.51%。 相似文献
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Thomas M.Trexler 《半导体技术》2004,29(5)
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test. 相似文献
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The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high. 相似文献
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The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation. 相似文献
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Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible. 相似文献
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Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers
A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it. 相似文献
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A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working. 相似文献
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《中国通信》2014,(7)
正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks 相似文献
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《中国通信》2014,(8)
正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first 相似文献
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LI Shaoqian 《中国通信》2014,(6):I0001-I0002
The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave (ram-wave) frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications. 相似文献