Seabed scene simulation and its realization in extending Vega

Realistic simulation of underwater scene is always difficult because of the special and complex vision effects in underwater space. Seabed is an important part of underwater environment. This paper describes the methods for seabed scene simulation based on OpenGL. It includes construction of fluetuant terrain based on the random sinusoidal algorithm, simulation of seabed flicker effect by means of circular texture mapping and generation of turbidity effect by using fog techniques. For the application based on the leading high level 3D development environment-Vega, underwater scene simulation is still a difficulty since there is no module for it. Based on the analysis of Vega software and the research on seabed scene simulation methods, a Vega extending module named “Underwater Space” was created through developing module class and extending lynx interface. The module class was designed through developing DLL written in C . The Lynx was extended through developing keyword configure file, GUI configure file and lynx plug-in DLL. The problem that Vega can‘t simulate underwater space, is elementarily resolved. The results show that this module is efficient, easy using, and the seabed scene images am vivid.     

电力电子技术与工业企业电能质量的控制

介绍了电能质量的相关概念和现状,讨论了如何利用电力电子技术作为对策来解决电能质量中停电、电压跌落和谐波等突出问题.     

The motion analysis of fire video images based on moment features and flicker frequency

In this paper, motion analysis methods based on the moment features and flicker frequency features for early fire flame from ordinary CCD video camera were proposed, and in order to describe the changing of flame and disturbance of non-flame phenomena further more, the average changing pixel number of the first-order moments of consecutive flames has been defined in the moment analysis as well. The first-order moments of all kinds of flames used in our experiments present irregularly flickering, and their average changing pixel numbers of first-order moments are greater than fire-like disturbances. For the analysis of flicker frequency of flame, which is extracted and calculated in spatial domain, and therefore it is computational simple and fast. The method of extracting flicker frequency from video images is not affected by the catalogues of combustion material and distance. In experiments, we adopted two kinds of flames, i.e. , fixed flame and movable flame. Many comparing and disturbing experiments were done and verified that the methods can be used as criteria for early fire detection.     

基于虚拟仪器的电压闪变测量模块设计

介绍了闪变的概念和闪变测量的基本原理，并根据该原理设计了一种基于虚拟仪器的电压闪变测量模块，对所设计的闪变测量模块进行了仿真验证，用该闪变测量模块对模拟电弧炉装置的电压闪变进行了实际测量，仿真验证和测量结果表明，该闪变测量模块工作稳定，测量精度满足IEC要求，具有一定的工程实用性。     

闪变仪研制及其在电气化铁道的应用

作为评定电能质量的重要指标之一，闪变直接反映出电网电压质量，根据国际电工委员会(IEC)制定的闪变仪设计规则，讨论闪变仪数学模型和数字化测量的实现方法，通过仿真验证了其正确性，并在此基础上完成了基于虚拟仪器技术的IEC闪变仪设计，相关测试系统已在电气化铁道工程中的应用。     

FLICKER INDEX METHOD FOR EVALUATING FLICKER IN COLOR PDPs

Motionartifacts ,thenumberofvisiblegraylevelsandlargeareaflickerarethemainissuesaf fectingimagequalityincolorPDPs[1] .Thehighlyflickeringimagescausemoreseverefatigueofbrainthanofeyes[2 ] .Inordertoreduceflickereffectively ,theframerateand/orhorizontalfrequencyaredoubledtopreventlargeareaflickerinsuchCRTtelevisionsets.However ,itisundesirabletoadoptframerateconversiontechnologyincolorPDPswhenaddressdisplayseparated (ADS)drivingmethodisused[1] .Athigherframerate ,lesstimeisavailableperframe…     

A Novel Automatic Method for Removal of Flicker in Video

Intensity flicker is a common form of degradation in archived film. Most algorithms on this distortion are complicated and uncontrolled. This paper presented a discrete mathematical model of flicker, designed a block-based estimation method of the model＇s parameters according to their features of intensity variation in large area. With this estimation result it constructed a compensation model to repair the current frame. This restoration approach is full automatic and the repair process of current frame does not need the information of frames behind it. The algorithm was realized to establish a simple and adjustable repair system. The experimental results show that the proposed algorithm can remove most intensity flicker and preserve tho wanted effects.     

实验室电弧炉闪变模拟与SVC补偿算法研究

针对交流电弧炉软件仿真模型不能为补偿装置提供试验依据的缺点,提出了一种基于等效电路法建立的硬件模型。通过实验验证了该模型的有效性,并结合其特性设计了电弧炉用SVC控制算法,实验结果表明其抑制闪变效果明显。