一种自动分割视频对象的新方法

提出了一种视频对象自动分割及跟踪方法。该算法首先进行相邻帧差分检测和Canny边缘提取,得到相邻帧差分边缘模板;其次在相邻帧差分边缘和当前帧边缘的基础上,检测出视频对象的初始边缘模板。然后分为快变和慢变两部分进行跟踪,并对视频对象边缘模板更新以适应对象的运动;最后根据跟踪更新出的视频对象二值边缘模板,通过文中提出的填充技术及模板轮廓修正得到精确的视频对象模板提取出视频对象。实验验证表明,该算法对目标的整体运动和局部形变都有较强的适应性。此外,算法还具有简便、准确性高的特点。     

改善分支限界法求解旅行商问题效率的策略

叙述了NP完全问题的复杂性及分支限界法求解问题最优解的策略,分析了利用分支限界法求解旅行商问题过程中影响算法求解效率的主要原因。针对欧氏空间的旅行商问题求解,提出了通过化简初始边集的策略,改善算法的求解效率,通过实验说明了该策略的有效性。该策略可应用到求解旅行商问题的其他算法中。     

Method of adaptive PLL bandwidth adjustment without phase slipping

In a system based on the phase lock loop（PLL）, a trade-off must be made between the tracking precision and the dynamic performance if constant parameters are adopted. To overcome this drawback, a new method called no phase slipping adaptive bandwidth（NPS-AB） is proposed, which can adjust the loop bandwidth adaptively for different working conditions. As a result, both the tracking precision and the dynamic performance can be achieved concurrently. NPS-AB has two features to keep the loop stable： one is the capability of quick response to dynamics; the other is a series of additional constraints when the bandwidth is switched. Compared with other methods, there is no phase slipping during the adjustment process for NPS-AB. The phase integer ambiguity can be avoided and the phase value is kept valid. It is meaningful for carrier ranging systems. Simulation results show that NPS-AB can deal with sudden dynamics and keep the pseudo-range value stable in the entire dynamic process.     

DGPS实时引导和跟踪系统

以对空目标寻的系统的外场试验为背景，介绍了一种采用差分GPS定位技术，结合计算机软件而设计的目标实时引导和跟踪系统，并给出了某试验系统的试验实测数据和结果分析。试验证明，该系统工作十分有效，而且使用方便，工作可靠，值得推广。     

边染色9-临界图边数的新下界

针对Vizirtg猜想△为9的情况，运用Discharging差值转移方法研究了9-临界图的边数下界，得到了新结论：m≥10^-36n,改进了已有结果。     

特征尺度自动选择边缘分割方法

针对复杂边缘错综交织而不易分割的问题，提出了特征尺度自动选择边缘分割方法.该方法通过定义相邻两层离散尺度空间中边缘点最大偏移量，以及分析极值路径的4种演化方式，得到具有实际意义的边缘点特征尺度.根据边缘线尺度直方图和尺度空间边缘连通性，对交织的边缘进行剥离和合并，得到分割的结果.通过在多幅测试图片上的实验表明，根据尺度范围获得的边缘多尺度表达层次清晰分明，并且按照显著性提取的显著边缘较少出现细碎旁枝与实际显著边缘能较好地吻合，证明提出的边缘分割方法切实有效.

     

切削用量对刀具耐用度影响的探讨

简述了切削用量对刀具耐用度的影响程度,叙述了在零件加工过程中合理的选取切削用量和合适的刀具耐用度,对于提高机械加工的效率有很大的作用.     

Wm V C3的点可区别正常边色数

对于轮和圈的联图，给出了一种点可区别的边染色方法，并得到了其点可区别边色数．     

Calculation of angular glint in near field utilizing graphical electromagnetic computing

The angular glint in the near field plays an important role on radar tracking errors. To predict it more efficiently for electrically large targets, a new method based on graphical electromagnetic computing （GRECO） is proposed. With the benefit of the graphic card, the GRECO prediction method is faster and more accurate than other methods. The proposed method at the first time considers the special case that the targets cannot be completely covered by radar beams, which makes the prediction of radar tracking errors more self-contained in practical circumstances. On the other hand, the process of the scattering center extraction is omitted, resulting in possible angular glint prediction in real time. Comparisons between the simulation results and the theoretical ones validate its correctness and value to academic research and engineering applications.     

煤矿顶板裂纹图像的小波分析

将数字图像处理技术引入到对煤矿顶板岩石裂纹图像的分析当中,这种通过图像研究裂纹的方法不依赖具体的岩石岩性及其力学特征。首先对裂纹图像进行多分辨率小波变换,分析图像的不同频带所包含的信息,接着对裂纹图像实现边缘提取,为图像的定量测量提供依据。