基于HSV空间的车牌定位方法

车牌区域的颜色特征是车牌的重要信息.针对车牌区域颜色的伴生与互补特性,提出了一套在HSV空间利用颜色特征进行定位的算法.该算法利用车牌区域固定的颜色特征,快速定位到与车牌颜色有关的区域,然后利用车牌区域伴生与互补特性快速去除具有与车牌区域相同颜色的其他非车牌区域.最后使用投影积分进行车牌的精确定位.通过对200幅从交通卡口获取的真实的彩色图像进行试验,准确定位率为98%.     

一种新的H—CgCr肤色模型的肤色检测方法

提出一种新的H—CgCr肤色模型进行肤色检测，该模型充分利用色调和色度信息区分肤色像素和非肤色像素．并利用形态学操作去除检测出皮肤区域中毛刺、空洞等噪声．实验结果表明该方法在复杂光照条件下能有效检测出肤色区域．     

Double threshold behaviour of I－V characteristics of CoSi2/Si Schottky contacts

The forward current－voltage (I－V) characteristics of polycrystalline CoSi₂/n-Si(100) Schottky contacts have been measured in a wide temperature range. At low temperatures (≤200K), a plateau-like section is observed in the I－V characteristics around 10^-4A·cm^-2. The current in the small bias region significantly exceeds that expected by the model based on thermionic emission (TE) and a Gaussian distribution of Schottky barrier height (SBH). Such a double threshold behaviour can be explained by the barrier height inhomogeneity, i.e. at low temperatures the current through some patches with low SBH dominates at small bias region. With increasing bias voltage, the Ohmic effect becomes important and the current through the whole junction area exceeds the patch current, thus resulting in a plateau-like section in the I－V curves at moderate bias. For the polycrystalline CoSi₂/Si contacts studied in this paper, the apparent ideality factor of the patch current is much larger than that calculated from the TE model taking the pinch-off effect into account. This suggests that the current flowing through these patches is of the tunnelling type, rather than the thermionic emission type. The experimental I－V characteristics can be fitted reasonably well in the whole temperature region using the model based on tunnelling and pinch-off.     

Exact solutions for nonlinear Schr?dinger equation in phase space: applications to Bose－Einstein condensate

The stationary-state nonlinear Schr?dinger equation, which models the dilute-gas Bose－Einstein condensate, is introduced within the framework of the quantum phase-space representation established by Torres-Vega and Frederick. The exact solutions of equation are obtained in the phase space, by means of the wave-mechanics method. The eigenfunctions in position and momentum spaces are obtained through the ‘Fourier-like' projection transformation from the phase space eigenfunctions. The eigenfunction with a hypersecant part is discussed as an example.     

Residual-Based Shadings for Visualizing (Conditional) Independence

Residual-based shadings for enhancing mosaic and association plots to visualize independence models for contingency tables are extended in two directions: (a) perceptually uniform Hue-Chroma-Luminance (HCL) colors are used and (b) the result of an associated significance test is coded by the appearance of color in the visualization. For obtaining (a), a general strategy for deriving diverging palettes in the perceptually based HCL space is suggested. As for (b), cutoffs that control the appearance of color are computed in a data-driven way based on the conditional permutation distribution of maximum-type test statistics. The shadings are first established for the case of independence in two-way tables and then extended to more general independence models for multiway tables, including in particular conditional independence models.     

B离子掺杂TiO2催化剂(TiO2－xBx)光催化活性的研究

采用溶胶-凝胶法制备出纳米TiO₂和TiO_2－xB_x催化剂. 光催化实验证明, TiO_2－xB_x催化剂的紫外、可见光催化活性均高于TiO₂. XRD, XPS和Raman结果表明, B离子是以取代式掺杂占据了TiO₂的O^2－的晶格位置. UV-Vis和PL谱的结果表明, B离子的2p轨道与O的2p轨道形成混合价带, 产生可见光响应, B离子的掺入有效地阻止了光生载流子的复合, 促进了其分离, 是TiO_2－xB_x催化剂紫外、可见光催化活性提高的主要原因.     

基于HSV与MLPQ的自适应人脸检测算法

针对复杂背景下彩色图像的人脸检测问题,提出一种基于HSV与MLPQ的自适应人脸检测算法。首先用HSV空间的肤色模型分割出可能包含人脸的区域;其次用可调的搜索窗口提取可能的人脸区域,并提取其多尺度局部相位量化特征(MLPQ);最后通过计算人脸候选区域MLPQ直方图与训练样本库中人脸的MLPQ直方图的欧式距离,自适应的进行人脸的确认与定位。在BioID人脸库,及彩色FERET人脸库中进行了多组实验,分别取得了92.5%及90.5%的检测率,充分验证了该方法的有效性。     

混合高斯模型下的自适应阈值阴影检测

针对现有阴影检测算法参数众多,需要训练参数或者手动设置阈值的缺点.文章提出一种基于HSV颜色信息的自适应阈值阴影检测方法,并利用最大熵阈值分割实现自适应阈值阴影检测.实验表明,该方法能够准确地检测出阴影,鲁棒性强.     

区间规划问题的最优性条件

区间规划是带有区间参数的规划问题,是一种更易于求解实际问题的柔性规划。它是确定性优化问题的延伸,有区间线性规划和区间非线性规划两种形式。本文讨论了目标函数是区间函数的区间非线性问题。给出了区间规划问题最优性必要条件的较简单证明方法,并利用LU最优解的概念,在一类广义凸函数－(p,r)－ρ－(η,θ)－不变凸函数定义下讨论了最优性充分条件。