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Energy-efficient communications is crucial for wireless sensor networks (WSN) where energy consumption is constrained. The transmission and reception energy can be saved by applying network coding to many wireless communications systems. In this paper, we present a coded cooperation scheme which employs network coding to WSN. In the scheme, the partner node forwards the combination of the
source data and its own data instead of sending the source data alone. Afterward, both of the system block error rates (BLERs) and energy performance are evaluated. Experiment results show that the proposed scheme has higher energy efficiency. When Noise power spectral density is -171dBm/Hz, the energy consumption of the coded cooperation scheme is 81.1% lower than that of the single-path scheme, 43.9% lower than that of the cooperation scheme to reach the target average BLER of 10-2. When the channel condition is getting worse, the energy saving effect is more obvious. 相似文献
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局部特征与多示例学习结合的超声图像分类方法 总被引:2,自引:0,他引:2
利用全局特征对超声图像进行描述具有一定的局限性,而且对图像进行手工标注的成本过高, 为解决上述问题,本文提出了一种利用局部特征描述超声图像,并结合多示例学习对超声图像进行分类的新方法. 粗略定位图像中的感兴趣区域 (Region of interest, ROI),并提取局部特征,将感兴趣区域看作由局部特征构成的示例包, 采用自组织映射(Self-organizing map, SOM)的方法对示例特征进行矢量量化,采用Bag of words方法将示例特征映射到示例包空间,进而采用传统的支持向量机对示例包进行分类.本文提出的方法在临床超声图像上进行了实验,实验结果表明,该方法具有良好的泛化能力和较高的准确性. 相似文献
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PCNN模型在彩色图像分割中的应用 总被引:1,自引:0,他引:1
针对脉冲耦合神经网络(PCNN)模型主要应用于灰度图像处理的局限性,利用脉冲发生器将颜色信息引入模型作为输入,与灰度信息共同控制神经元的内部行为,控制等灰度值的不同颜色区域分期点火,实现彩色图像的精确分割.双输入PCNN模型实现了彩色图像的分割,同时保持了PCNN模型对噪声的鲁棒性,从简单的仿真图像和实际图像两方面验证了此分割方法的有效性. 相似文献
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为提高清分系统中纸币污损检测的准确率,减少撕裂和笔迹等污损对检测的影响,提出了一种基于小波分解的污损检测算法.采用仿射变换和小波变换进行纸币图像配准,运用Kirsch算子提取图像边缘信息,通过计算边缘强度差提取出纸币图像的污损特征,将纸币图像划分为若干个固定大小子区域,通过对每个区域的污损特征统计来判断该区域是否存在污... 相似文献
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本文面向手写字符序列输入信号连续识别研究,分析了汉字及联机手写文本的特点,提出并构建了手写汉字部件集。基于该部件集,完成了GB2312-80的6,763个汉字的部件拆分编码和部件集的测试。统计编码数据发现,汉字依手写部件数的分布规律呈对数正态分布。本文从统计学和字符识别技术的角度对手写部件的构字能力作了分析和讨论,部件集的设计方案在部件选择和汉字拆分上均满足设计要求。实验表明,基于手写部件构造的部件识别器对手写汉字和连续汉字的部件识别率分别达到70.21%和58.49%。 相似文献
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For the design of a system for on-line recognition of handwritten Chinesecharacters stroke segment ordering is such a difficult problem no good solution is availableto it yet so far.An optimal stroke segment matching algorithm based on stroke structureinformation is proposed in this paper.Results of experiments are presented so thatcomparison can be made between the proposed algorithm and the stroke segmentmatching method based on the strokes’absoulute coordinates. 相似文献
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