基于GMSL的车载摄像系统研究

为了实现车载高清视频长距离、低损耗地传输,研究了基于吉比特多媒体串行链路(Gigabit multimedia serial link, GMSL)技术的车载摄像传输系统的框架及其原理。通过对车载摄像传输系统的硬件电路、硬件编解码以及视频信号编码原理的探究,设计了一款车载前视摄像系统。首先,根据调研结果,模拟出传输系统整体环境框架。接着,对供电电源以及视频信号初始编解码的研究结论加以实际运用,使其能够稳定编码并有效传输视频信号。然后,进一步探究加串器/解串器架构,在完成配置硬件的同时,对数据波形进行采集、归纳和总结。最后,分析恢复后所得的信号及图像质量并给予评价,从而完成对基于GMSL的车载摄像系统的研究。实验结果表明,本摄像系统实现了串行、解串的功能。该功能可以使用GMSL技术调制出能够有效传输15 m的视频信号。在主控对该视频信号解串后,最终能够得到稳定、实时的高清视频图像。研究成果表明,基于GMSL的车载摄像系统基本能够实现长距离、低损耗地传输分辨率为720 P的视频图像。进一步,此次研究成果能服务于当下的汽车自动驾驶。     

新型微发泡气体注射器注气过程可视化研究

气体注射器是微发泡注塑过程中一个重要装置,本文研究了新型气体注射器的注气过程,通过高速摄像和计算机数据采集系统采集的压力曲线分析注气过程,发现气体从气体注射器进入可视化装置时呈分散状态,有利于在微发泡过程中气体与熔体的分散混合。通过压力数据计算注气流量并配合高速摄像图像分析发现,注气压差和初始水压对注气流量影响很大。通过研究注气过程和注气量,发现新型微发泡气体注射器注气过程稳定可控,可用于微发泡注塑实验。     

材料烧结点测试系统及其图像处理

本文论述了材料烧结点测试系统的工作原理及其组成。采用数字图像处理技术 ,引入高速A/D转换及计算机系统 ,以实现对材料烧结点进行高效、可靠的测试。测试结果表明 ,这是一个实用的计算机自动检测系统。     

Detection of corrosion steel under an organic coating by infrared photography

The application of an infrared camera for detecting corrosion under organic coatings was studied. The ruptured blistering area, blister and filiform corrosion can be monitored easily by infrared thermography. When the corroded specimen is heated, the temperature at the surface over the corroded area changed differently according to the type of corrosion.The extent of increase in temperature was in the following sequence: ruptured blister > filiform filament > intact part > blister.From the analysis of temperature distribution at the surface of specimen, the location, shape and size of the corroded area can be estimated.     

New approach in tool wear measuring technique using CCD vision system

This paper suggests a reliable direct measuring procedure for measuring different tool wear parameters. Modern image processing techniques and machine vision systems today enable direct tool wear measurement to be accomplished in-cycle. The presented system is characterized by its measurement flexibility, high spatial resolution and good accuracy. The system consists of a light source to illuminate the tool, CCD camera, laser diod (used in conjunction with profile deepness assessment) with linear projector, grabber for capturing the picture, and a PC. The technique is specially characterized by its determination of profile deepness with the help of projected laser raster lines on a tool surface. So it has advantage comparing with other techniques, which can measure only 2D profiles. With the technique presented in this paper a 3D image of relief surface can be obtained without having need to employ a very complicated measuring system. All indirect methods like acoustic emission, force measurement, spindle current measurement, vibration sensors, etc. are very time consuming and demand very expensive subsidiary measurement equipment, compared with the method presented here.     

Molten pool and temperature field in CO_2 laser welding

0IntroductionCompared with conventional welding methods,laserwelding has many advantages,such as large penetrationratio,small HAZ,small welding deformation.Another ad-vantage of laser welding is easy to weld complicated com-ponents because laser can be transferred by mirrors andoptical fiber.The laser welding will find wide applicationswith the laser system developing.Induced-plasma,molten pool and keyhole are mainphenomena in study of laser welding process.The varietiesof them indicate the …     

CO2激光焊接不锈钢光致等离子体动态特性分析

光致等离子体是CO2激光焊接中一个重要的物理现象，它与焊接的稳定性、焊接质量及能量利用率等都有密切的关系。利用高速摄像及光信号监测两种手段对等离子体的动态变化过程及其对焊接稳定性的影响进行了深入的研究。提出了等离子体的变化每个周期内分为四个阶段，而影响焊接稳定性的根本原因是等离子体在穿透与未穿透之间的波动。     

Difference in electron- and gamma-irradiation effects on output characteristic of color CMOS digital image sensors

Changes of the average brightness and non-uniformity of dark output images, and quality of pictures captured under natural lighting for the color CMOS digital image sensors irradiated at different electron doses have been studied in comparison to those from the γ-irradiated sensors. For the electron-irradiated sensors, the non-uniformity increases obviously and a small bright region on the dark image appears at the dose of 0.4 kGy. The average brightness increases at 0.4 kGy, increases sharply at 0.5 kGy. The picture is very blurry only at 0.6 kGy, showing the sensor undergoes severe performance degradation. Electron radiation damage is much more severe than γ radiation damage for the CMOS image sensors. A possible explanation is presented in this paper,     

红外球形摄像机补光系统的设计与实现

为解决目前红外球形摄像机普遍存在的红外灯板发热严重、近距离采集图像容易出现中心过曝等问题,搭建了以STM32F103为主控芯片、以PT4115为红外灯调光芯片的硬件电路,设计了一种基于红外灯亮度与镜头倍率匹配算法的新型红外球形摄像机补光系统,实现了在红外灯板上对多个串联红外灯的PWM智能调光。通过实验证明,该设计可以有效节约功耗、降低发热,提高了红外灯板的稳定性,从而提高红外球形摄像机的夜视监控效果。     

摄像稳定平台中摩擦补偿变结构控制研究

为获取清晰稳定的视频图像,必须利用稳定平台给船载摄像机提供一个良好的空间稳定环境。该平台为一个三轴机械设备,当船体处于不同的运动姿态时,轴系间摩擦力矩会改变,因此提出一种考虑摩擦补偿的变结构控制方法。仿真和研究结果表明,与经典PID控制方法相比,变结构控制器能有效消除因摩擦引起的"爬行"和"平顶"现象。使用指数趋近律的变结构控制算法使系统快速跟踪指令信号,动态效果良好。