带CDS的CMOS APS图像传感器的研究

为了减小CMOS图像传感器的低频噪声(如KTC噪声和1/f噪声)和固定图形噪声,采用了相关双采样技术.用标准的1.5 μm P阱双层多晶硅双层金属的CMOS数字电路工艺,研制出512像素带相关双采样的CMOS有源像素图像传感器线阵.实验结果为灵敏度11 V/Lx.s均方根噪声为0.2 mV;动态范围为80 dB,直流功耗为10 mW.     

一种新的片上抑制CMOS图像传感器暂态噪声方法术

暂态噪声是CMOS图像传感器暗光下噪声的重要组成部分,不但影响图像质量,而且限制图像动态范围的提高。提出了一种新的自适应片上抑制CMOS图像传感器暂态噪声的方法。将多帧采样图像进行空间转换,使用自适应增益将多帧采样图像中相应像素进行加权平均,进行空间逆变换,得到去噪后的像素值。对20组图片进行实验,结果表明算法能够克服...     

CMOS图像传感器的自适应降噪方法研究

提出了一种用于CMOS图像传感器的新型自适应降噪方法,并进行了逻辑电路实现。该方法通过运动检测和边缘检测技术进行噪声功率统计和分析,选择性的利用中值滤波、均值滤波以及运动自适应滤波方法,对传感器输出图像进行了数字降噪处理。实验表明本文方法降低了高斯噪声和椒盐噪声的影响,有效提高了图像质量和峰值信噪比。其结构易于电路实现,适用于CMOS图像传感器内部的实时降噪处理。     

CMOS图像传感技术及其在影像产品中的应用

随着超大规模集成技术的发展，CMOS图像传感器显示出强劲的发展趋势。CMOS图像传感器具有在单芯片内集成时序和控制电路、A／D转换、信号处理等功能。本文介绍了CMOS图像传感器的结构和工作原理，并与CCD图像传感器进行比较，综述了CMOS图像传感器的最新进展及其在影像产品中的应用。     

CMOS图像传感器芯片OV5017及其应用

阐述了CMOS图像传感器的一般特征,详细介绍了CMOS黑白图像传感器芯片OV5017的性能与使用特点,讨论了OV5017在图像采集中的应用。     

抗辐射低噪声CMOS图像传感器设计技术研究

为满足航天应用对大面阵高动态CMOS图像传感器的需求,对噪声优化与辐射加固等关键技术进行了深入研究。基于系统架构的增益级与双相关双采样设计优化、基于采样电路的时序改进,实现了对系统噪声的多层次优化;基于像素级与电路级的总剂量辐射加固与单粒子闩锁辐射加固设计,实现了对100k rad(Si)总剂量和99.8 MeV·cm2/mg单粒子效应的免疫。研究成果已成功应用于一款64M像素超大面阵高性能CMOS图像传感器产品。流片测试结果显示,抗总剂量辐射能力优于100k rad(Si)、暗电流与噪声随辐射增长率提升了一个数量级;抗单粒子闩锁能力优于99.8 MeV·cm2/mg;在整个辐射环境下读出噪声不超过5e-;本征动态范围高达75dB。     

大面阵高帧频可配置CMOS数字视频系统研究与实现

CMOS图像传感器在许多领域取得了广泛的应用。选用IBIS5-A-1300作为大面阵高帧频CMOS图像传感器,通过FPGA实现对视频系统的控制并采用USB2.0作为高速数据接口接收主机指令和传输图像数据。提出了一个完整的采用CMOS图像传感器的数字视频系统设计方案。     

CMOS图像传感器的商业化发展

随着超大规模集成技术的发展,CMOS图像传感器显示出强劲的发展趋势.CMOS图像传感器可在单芯片内集成时序和控制电路、A/D转换、信号处理等功能.本文简单介绍了CMOS图像传感器的背景,分析了CMOS图像传感器和CCD图像传感器的优缺点,综述了目前CMOS图像传感器的研究进展.     

嵌入式系统中CMOS图像传感器接口技术

提出了CMOS(互补金属氧化物半导体)图像传感器在嵌入式系统中的接口技术,通过设计软件驱动使嵌入式处理器能够控制CMOS图像传感器图像数据自动采集.并对CMOS图像传感器采集的数据进行插值和自动白平衡处理.此接口模块已经成功地应用于二维条码识读器的图像采集模块中,取得了良好的效果.     

安森美半导体的全局快门图像传感器解决机器视觉的成像需求

图像传感器的性能指标及发展趋势 图像传感器是机器视觉系统捕获图像信息的关键元件.衡量图像传感器性能的因素包括分辨率、灵敏度、带宽、噪声、功耗、光学格式、帧率和CRA等.没有哪一种单一的图像传感技术或产品适用于所有应用,因而设计人员需根据应用需求匹配最适合的技术.相对而言,CCD传感器提供最佳的图像均匀度、高线性动态范围、高光灵敏度、大光学格式,而CMOS传感器提供灵活读取、低功耗、高帧率和高集成能力.     

CMOS有源象素图象传感器

介绍了ＣＭＯＳ图象传感器一般结构、ＣＭＯＳ图象传感器的象元结构和在片模拟信号处理，并介绍了两种典型的ＣＭＯＳ有源象素图象传感器，最后指出了ＣＭＯＳ有源象素图象传感器的发展动向     

光学视觉传感器技术研究进展

视觉传感是人类感知外界、认知世界的主要途径，研究表明人类获取的外界信息大约有80%来自于视觉。作为感知外界信息的“电子眼球”，视觉传感器是消费电子、机器视觉、安防监控、科学探测和军事侦察等领域的核心器件。近年来视觉传感器技术发展迅速，不同类型的传感器从不同维度提供丰富的视觉数据，不断增强人类感知与认知能力，视觉传感器研究工作具有重要的理论与应用需求。本报告以典型光学视觉传感器技术为主线，通过综合国内外文献和相关报道，从CCD图像传感器、CMOS图像传感器、智能视觉传感器以及红外图像传感器等研究方向，梳理论述近年来光学视觉传感器技术的发展现状、前沿动态、热点问题和趋势。     

CMOS图象传感器发展状况

比较了CMOS图象传感器与CCD图象传感器的优缺点,分析了C MOS图象传感器的结构、研制现状、应用及市场前景。指出了随传感器技术的发展,CMOS图 象传感器可以代替CCD图象传感器,并预见了其发展趋势。     

基于并口的CMOS图像传感器数据采集技术研究

CMOS图像传感器是一种新颖的图像传感器件，在许多传统的图像传感领域得到了广泛应用。并口则是现今计算机配备的标准接口之一，也是数据采集的通用接口。文章给出了一种利用计算机的并行口实现对CMOS图像传感系统图像数据采集的方法，可以为研究CMOS图像传感器的各种特性提供一种方便的数据采集手段。     

基于CMOS工艺的无线图像传感器网络综述

无线传感器网络是无线通讯技术、网络技术、传感器技术交叉融合的新兴产物。无线传感器网络具备小型化、智能化、网络化和能够无线通讯等特点,能够满足人们在生产生活、科学研究、军事、医疗等众多领域对于实时信息获取的需求。由于人类获取信息的80%以上是通过视觉获取的,因此,无线图像传感器网络作为人类获取视觉图像信息的重要工具在无线传感器网络中占有重要的地位。无线图像传感器网络要想实现小型化、智能化、集成化等要求,采用与标准CMOS工艺兼容的CMOS图像传感器技术将是最为理想的选择。随着CMOS图像传感器工艺和设计水平的进步,CMOS图像传感器在成像质量、生产成本、小型化、智能化等方面显示出巨大的优势,同时由于与VLSI电路兼容的天然特性,基于CMOS图像传感器的无线图像传感器网络拥有巨大的发展潜力和广阔的市场前景。基于CMOS的无线图像传感器网络目前呈现多元化的发展趋势,高分辨率、高速、低功耗、智能化等方向是基于CMOS的无线图像传感器网络未来发展的方向。     

Stereo vision system for moving object detecting and locating based on CMOS image sensor and DSP chip

Currently, most of the stereo vision systems are constructed on PC-based or multi-CPU combination structures with two CCD cameras. It is difficult to be applied in movable plants for stand-alone requirement. Due to electronic technology development, the complementary metal-oxide semiconductor (CMOS) image sensor has been widely used in a lot of electronic commercial products and the digital signal processor (DSP) operation speed and capacity are good enough for stereo vision system requirement. Here, a new stereo vision platform is designed with TMS320C6416 DSK board integrated with two CMOS color image sensors for detecting and locating moving objects. The data communication interface, system monitoring timing flow, and image pre-processing software programs are developed, too. This system can be used to detect and track any moving object without object color and shape limitations of previous study. Experimental results are used to evaluate this system’s dynamic performance. This low cost stereo vision system can be employed in movable platform for stand-alone application, i.e., mobile robot.     

VISYR: a simulation tool for mobile robots using vision sensors

With the advent of mobile robots and inboard vision sensors mounted directly on the robot's wrist, new kinds of problems lie in the image processing field as, for example, dynamic scene analysis or motion estimation. The lack of flexibility of real experiments led us to implement at IRISA a general simulation tool devoted to the study of robots using moving vision sensors. VISYR allows us to simulate the image perceived by a robot of its environment during its motion.The first part of the paper is devoted to the modelling of the 3D scene containing complex objects and to the design of a suitable robotics vision sensor. In the second part, a new algorithm of dynamic management of the local data basis perceived by the sensor is presented. The parameters of the vision sensors are highly adjustable and VISYR is conceived to allow the fast development of algorithms using dynamic vision data.     

A CMOS slew-rate enhanced OTA for imaging

CMOS Image Sensors have many applications currently. They are present everywhere and almost everyone owns many cameras based on these sensors ranging from mobile phones (with several cameras), to tablets, computers, security devices and cars. Although they work pretty well as we increase their resolution and quality we face a few problems. One of these problems is Flicker noise. The other source of noise, thermal, evolved a lot recently and flicker noise is now the main limitation regarding improving the performance. This work presents a new method to reduce the flicker noise contribution in the overall sensor noise by reducing the time for Double Sampling, allowing to filters more correctly the flicker noise spectrum introduced by the pixel source follower amplifier. We also introduce a way to remove the column induced lag that comes from the column readout circuitry by using strong and stable references. We propose a new amplifier that is used as a buffer for the reference voltage. At the same time Double Sampling is performed. This solution contributes both to reduce the current consumption and time between samples which also contributes to a lower power heat dissipation. The developed circuit can be seen as a generic solution for applications that need stable references and high resolution, resulting in a massively parallel circuit, as it is common in CMOS image sensors. The proposed solution is tested with a circuit containing 3000 readout columns.     

基于CM O S 图像传感器的以太网传输系统设计

CMOS image sensor has been widely used in the field of visible image. It has the characteristics of low cost, low power consumption and high integration. How to transmit the collected image data effectively and improve the transmission distance is one of the main problems in practical application. In addition to the advantages of providing long-distance transmission, Ethernet has the characteristics of high transmission efficiency, simple structure and reliable operation. This paper describes a design scheme of Ether- net transmission system based on CMOS image sensor. Image data is collected by CMOS image sensor, image processing is realized by FPGA, and transmission is carried out through Ethernet interface. The method of displaying image on PC meets the application requirements of the design.