Correlation analysis-based image segmentation approach for automatic agriculture vehicle

INTRODUCTION In recent years,harvesting crop by combine has become more and more popular in China.In2003,combines were used to harvest23%of rice and71%of wheat.The work described here is part of a pro-ject aimed at researching automatic combines who follow the cut-uncut edge of the crops automatically to reduce the driver’s fatigue from the intensive work.Much attention has been focused on vision-bas-ed automatic agriculture vehicle.Image segmenta-tion is the key to extracting the guida…     

处于激发态的原子能够被电离吗?--一道物理习题的讨论与思考

笔者在教学过程中遇到这样一道习题 :一个氢原子处于第 3能级时 ,外面射来一个波长为 6.63× 1 0 - 7ｍ的光子 ,下列说法中正确的是 :Ａ .氢原子不吸收这个光子 ,光子穿过氢原子 .Ｂ .氢原子被电离 ,电离后的电子的动能为0 .3 6ｅＶ .Ｃ .氢原子被电离 ,电离后电子的动能为零 .Ｄ .氢原子吸收光子 ,但不电离 .该题见于江苏教育出版社出版的《自主学习与检测　高中物理练习册》二年级下册 ｐ .1 2 8,其参考答案为“Ａ” .由玻尔的氢原子模型理论可知Ｅｎ=Ｅ1/ｎ2 ,Ｅ1=-1 3 .6ｅＶ ,故Ｅ3=-1 .5 1ｅＶ ,又由爱因斯坦的光子说可知外面射来的光…     

基于图论的图像分割及其嵌入式应用研究

图像分割技术需要结合既定的特征分离图像,将其分割成独立的又相互连通的区域,这一技术被广泛应用到视频及图像处理中.经过数十年的发展,图像分割已成为图像处理领域的重要工作,然而依然面临着诸多尚未解决的问题.探讨图像分割以及嵌入式应用的具体情况,分析处理器嵌入式平台具体的时间以及空间上如何实现资源优化,实现更好的嵌入式应用.     

论水资源管理中的行政分割及其对策

当前我国水资源管理中存在的流域机构权威缺失、条块分割、块块分割和部门分割等体制性缺陷 ,要通过加强流域机构与地方政府协作、建立水资源市场化配置机制、促进流域经济一体化和实现水资源管理职能综合化等措施 ,以此构建水资源管理中的利益协调机制     

A learning-based method to detect and segment text from scene images

This paper proposes a learning-based method for text detection and text segmentation in natural scene images. First, the input image is decomposed into multiple connected-components (CCs) by Niblack clustering algorithm. Then all the CCs including text CCs and non-text CCs are verified on their text features by a 2-stage classification module, where most non-text CCs are discarded by an attentional cascade classifier and remaining CCs are further verified by an SVM. All the accepted CCs are output to result in text only binary image. Experiments with many images in different scenes showed satisfactory performance of our proposed method.     

在低频区具有大带隙的长方晶格二维光子晶体

利用降低光子晶体的对称性来提高绝对禁带宽度，在长方网格边上加正方介质柱而构成像素型长方晶格二维光子晶体，用快速平面波展开法计算其能带结构，通过参数优化，在低频区找到最大绝对禁带宽度△ωe=0．119ωe（ ωe=2πc／a，a为晶格常数，c为光速），绝对禁带中心频率ωmid=0．829ωe，△ω/ωmid=14，4％。     

用偏振缠绕的光子对进行量子通讯和密集编码

研究如何利用两粒子形成的ＥＰＲ－Ｂｅｌｌ态传输光子的量子态，并提出依赖于两光子缠绕的密集编码实验设想。     

Study on effect of segments erection tolerance and wedge-shaped segment on segment ring in shield tunnel

INTRODUCTION Shield tunnel method has become the most pre- ferred method in city tunnel construction because of its excellent attributes: little effect on surrounding environment, fast and safe construction, outstanding performance in earthquake resistance, etc. (Zhang et al., 2004). In different shield tunnels, the arrangement and number of segments are different, but the whole assembling process is generally the same. The as- sembling process begins with A2P, then A1P, A3P, BP, CP, …     

在“已有知识”的土壤中生根发芽——以“任意角的三角函数”教学设计为例

基于建构学习理论,对学生已有的认知结构及其对学习任意角三角函数可能产生影响的因素进行分析,并以此为基础进行教学设计,旨在希望学生能在探究和交流合作中,将任意角三角函数的概念顺利地纳入原有的知识结构中,进一步完善知识体系,真正达到高效的理解学习.     

用于超微弱发光研究的多通道光谱系统设计

光子计数成像采集系统是生物超微弱发光的光子计数研究的基本工具，通过自行设计的多通道光谱系统，扩展了现行的PIAS的测量功能，使之能对超微弱发光进行光谱测量，这在国内外均不多见．本对PIAS的工作原理和自行设计的多通道光谱系统都进行了说明，并给出了超微弱发光光子计数和光谱的测量结果．