一种城市道路照明智能化监控管理系统设计

根据城市道路照明的特点,提出一种实用的城市道路照明智能监控管理系统设计方案,分析了的总体系统结构,阐述了监控管理的基本原理和具体实施要求,并结合实际应用效果,对系统功能作了全面的介绍。     

多投影仪无缝拼接显示中的颜色校正技术比较研究

基于多投影仪的无缝拼接显示是对图形、图像、视频等进行大范围、高分辨率显示的一种有效实现方式。多投影仪无缝拼接显示的一个关键是解决颜色失调问题,而现有的颜色失调原因的分析结果可归纳为投影仪输出颜色的变化特性和投影屏幕与投影环境的影响两个方面。近年来,为解决该问题已提出了多种颜色校正技术,而根据解决颜色失调问题的原理和实现方法的不同,这些技术可分为基于边缘融合的校正技术、基于单一投影光源的校正技术和基于颜色/亮度输出匹配的校正技术3类,并对这3类技术在无缝拼接显示效果、可维护性和可扩展性等方面的优缺点进行了较详细分析,该领域下一步的研究将会朝着兼顾不同投影机类型、不同形状和反射特性的投影屏幕和考虑运动中观察者的实时颜色校正方向发展。     

Recursion from iteration

In a simply-typed, call-by-value (CBV) language with first-class continuations, the usual CBV fixpoint operator can be defined in terms of a simple, infinitely-looping iteration primitive. We first consider a natural but flawed definition, based on exceptions and iterative deepening of finite unfoldings, and point out some of its shortcomings. Then we present the proper construction using full first-class continuations, with both an informal derivation and a proof that the behavior of the defined operator faithfully mimics a built-in recursion primitive. In fact, given an additional uniformity assumption, the construction is a two-sided inverse of the usual definition of iteration from recursion. Continuing, we show that the CBV looping primitive is in fact the direct-style equivalent of a continuation-passing-style fixpoint, and that this correspondence extends all the way to traditional definitions of these operators in terms of reflexive types.An earlier version of this work appeared inProceedings of the 1992 ACM SIGPLAN Workshop on Continuations.Supported in part by NSF Grant CCR-8922109 and in part by the Avionics Lab, Wright Research and Development Center, Aeronautical Systems Division (AFSC), U.S. Air Force, Wright-Patterson AFB, OH 45433-6543 under Contract F33615-90-C-1465, ARPA Order No. 7597. The views and conclusions contained in this document are those of the author and should not be interpreted as representing the official policies, either expressed or implied, of the U.S. Government.     

改进Harris-Susan算法下砾石土料掺配均匀度评价

砾石土料掺配均匀程度对砾石土心墙坝的安全至关重要。数字图像处理方法被广泛应用于混合物识别领域,但在处理存在黏连特性的图像时易出现过分割与欠分割问题,导致评价结果精度不足。针对上述问题,本文提出改进Harris-Susan算法下砾石土料掺配均匀度评价方法。首先,改进Harris-Susan算法可分割欠分割区域并修复过分割区域,提高二值图像精度;其次,基于砾石邻域的概念,对图像进行单分位均匀度评价;最后,采用空间分布采样构建砾石土的空间均匀度评价指标。将该方法应用于大渡河双江口砾石土高心墙堆石坝工程建设中,本文方法相对统计准确率为0.935,较Otsu算法（0.353）和分水岭算法（-3.101）提升明显。结果表明,本文方法结果与筛分法高度一致,同时可有效节省人力、物力与时间成本,评价效率更高,具有很强的工程应用价值。     

分数阶时滞非线性多智能体系统的自适应控制

针对分数阶多智能体系统中存在时滞和非线性特性, 时滞往往会引起控制系统的性能下降甚至出现系统 不稳定等问题, 提出了一种含时滞非线性的分数阶多智能体系统自适应控制方法. 对于多智能体系统的控制协议, 设计了基于领导者和相邻智能体状态信息的自适应控制协议, 减小了过大常数控制增益带来的能源浪费. 对于一 致性, 利用图论基础、分数阶Halanay不等式稳定性定理、Kronecker积和Schur补引理, 获得了分数阶时滞非线性多 智能体系统的LMI一致性条件. 仿真结果验证了本文算法的正确性和有效性. 由于整数阶系统是分数阶系统的特殊 形式, 本文结论可以直接推广到整数阶多智能体系统中.     

Multi-scale fusion residual encoder-decoder approach for low illumination image enhancement

The sensing light source of the line scan camera cannot be fully exposed in a low light environment due to the extremely small number of photons and high noise, which leads to a reduction in image quality. A multi-scale fusion residual encoder-decoder (FRED) was proposed to solve the problem. By directly learning the end-to-end mapping between light and dark images, FRED can enhance the image's brightness with the details and colors of the original image fully restored. A residual block (RB) was added to the network structure to increase feature diversity and speed up network training. Moreover, the addition of a dense context feature aggregation module (DCFAM) made up for the deficiency of spatial information in the deep network by aggregating the context's global multi-scale features. The experimental results show that the FRED is superior to most other algorithms in visual effect and quantitative evaluation of peak signa-to-noise ratio (PSNR) and structural similarity index measure (SSIM). For the factor that FRED can restore the brightness of images while representing the edge and color of the image effectively, a satisfactory visual quality is obtained under the enhancement of low-light.     

Influence of ZrO2 particles on the optical properties of pc-LEDs

Experimental and modeling progress and results aiming to increase the color uniformity of hemisphere-type pcW-LEDs are proposed. By adding micrometric zirconia particles, the light scattering is enhanced, that induces a decrease of phosphor necessary to obtain a specific CCT. The optical model is able to determine the optical properties (CCT, angular CCT distribution, chromaticity and packaging efficiency) in a hemisphere LED for various amount of YAG-phosphor and ZrO₂-zirconia particles. Based on previous process, the work is in the first step to fit the effective radius and refractive index that will be implemented in the optical model. In the second step, the optical model is compared with the experimental measurement to determine the absorption coefficient and conversion efficiency of a package of silicone resin containing phosphor and zirconia. Finally, the model, confirmed by selected experimental results, allows determining the optical properties of any king of package that lead to a CCT emission ranging from 4500 K to 6500 K. The analysis of these data is interpreted by comparing, for a specific CCT, the phosphor loss, the packaging efficiency and the angular distribution of CCT. The results show that if the effort is targeted on one of the previous parameters, there is always a counterpart on the other ones. Increasing the color uniformity will induce to decrease the packaging efficiency.     

相位一致性和KDDA结合的人耳识别方法

随着人耳识别技术的发展,如何寻找不受光照和对比度影响的特征并用于识别成为研究热点之一。本文提出一种利用相位一致性对人耳进行特征提取的方法,该方法首先从8个方向计算人耳图像中每点的相位一致性,然后对经过相位一致性变换的输出图像分块求和,形成特征矢量,最后通过KDDA将特征向量投影到低维高可分空间,并用欧式距离对人耳图像分类。对77个人,共308幅人耳图像进行实验,在等误率为1.7%的情况下,识别率可以达到98.2%左右,验证了该方法所提取的人耳特征不受光照影响。     

Improving content visibility for high‐ambient‐illumination viewable display and energy‐saving display

Abstract— Nowadays, low‐contrast viewing of LC displays (LCDs) occurs very often, which includes the viewing of mobile LCDs at high ambient illumination and the viewing of LCDs at low‐power mode. These cases result in low‐content visibility and low contrast, leading to an unpleasant viewing experience. In this paper, a technique to improve the perceived contrast and visibility of images at low‐contrast viewing conditions is proposed. The proposed approach enhances image brightness with content and ambient adaptive image brightening and highlights visual parts and boundaries with non‐photorealistic rendering. The proposed technique enables longer battery life for mobile LC devices and makes mobile LC devices viewable at high ambient illumination. It also enables TVs with extreme low‐power consumption and smart‐grid responsive TVs.