基于角点的监控摄像头干扰检测

提出一种新的实时检测摄像头干扰的方法,建立一种基于最小核值相似区SUSAN(Smallest Univalve Segment AssimilatingNucleus)角点的图像特征函数,由于干扰发生时相对的几帧图像与正常图像相比会发生显著变化,因此通过比较图像的特征函数值来检测干扰的发生。利用一种逻辑判断方法做到对突变和渐变干扰的全面检测,并且避免对无害行为的误检,使之更具鲁棒性。对比已有的方法,分别对不同场景及不同类型的摄像头遮挡和转动干扰进行了多组测试,实验结果显示,该方法明显优于其它算法,能够很好地检测出对摄像头的遮挡及转动干扰,并且很好地避免了对无害行为的误检。     

在ASP.NET招生系统中使用Flash调用摄像头拍照

在ASP.NET招生报名系统中,使用Flash调用摄像头采集学生照片信息。     

Lens effect on synthetic image generation based on light particle theory

The synthetic image generation with the lens effect consists of two consecutive processors: the hidden-surface processor, and the focus processor. The normal ray-tracing algorithms are used in the first processor. The second processor computes Lommel's function, which is an infinite series of Bessel functions. In order to avoid the complicated calculation and the huge memory consumption, an approximation method based on the light particle theory is developed. No noticeable differences can be detected between the results from the approximation method and those from the exact calculation.     

Multi-Camera Human Activity Monitoring

With the proliferation of security cameras, the approach taken to monitoring and placement of these cameras is critical. This paper presents original work in the area of multiple camera human activity monitoring. First, a system is presented that tracks pedestrians across a scene of interest and recognizes a set of human activities. Next, a framework is developed for the placement of multiple cameras to observe a scene. This framework was originally used in a limited X, Y, pan formulation but is extended to include height (Z) and tilt. Finally, an active dual-camera system for task recognition at multiple resolutions is developed and tested. All of these systems are tested under real-world conditions, and are shown to produce usable results. This work has been supported by the NSF through grants #IIS-0219863, #CNS-0224363, #CNS-0324864, #IIP-0443945, #CNS-0420836, #IIP-0726109, and #CNS-0708344.     

基于Photoshop Camera Raw插件的数码照片后期处理案例分析

Camera Raw插件自Photoshop CS4版本之后就附加在软件中,这大大方便了数码照片的后期处理。文章使用Photoshop CS6,通过实例展示Camera Raw插件调整JPEG格式照片的强大功能。     

GPS/INS技术在城市测绘中的试验

航空摄影测量是城市测绘的重要手段和先进方法,随着GPS/INS技术的出现,推进了航空摄影测量长足发展,为快速实施城市测绘提供了有力的技术保障。本文通过对陕西省铜川市试验区在数码相机同高精度的GPS/INS系统联结下,墩外业像控布点区域网的大小、GPS/INS直接定向的精度、GPS辅助空三和GPS/INS辅助空三的精度对比等方面进行分析总结,具有一定的科学性和实用性。     

简便的高精度摄像机标定技术

本文利用投影和透视变换理论以及矩阵转换知识建立了摄像机数学模型,模型中全面考虑了镜头的径向畸变和切向畸变。提出仅用中心附近点求取像面中心的简单方法。在标定模型中考虑到二维孔靶与一维工作台运动方向不垂直因素的影响,从而简化摄像机标定的操作过程,提高了标定精度。     

基于FPGA的数字摄像机输出视频DVI显示

从硬件电路设计和EDA设计两个方面,介绍了一种基于FPGA的Camera Link接口数字摄像机输出视频DVI显示的实现方法.从系统的硬件电路入手,介绍了硬件电路的系统设计原理和各组成部分;重点介绍了FPGA内部各模块的划分、实现,包括Camera Link接口模块、前端FIFO控制模块、SDRAM控制模块、乒乓操作控...     

最新引进的高精度RMK-TOP航摄仪及其应用

本文主要介绍了高精度RMK－TOP航摄仪的主要部件及其技术性能和技术参数，以及该设备的主要技术特点和应用效果。