共查询到20条相似文献,搜索用时 31 毫秒
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为了解决在阅读过程中能够方便快速查阅生僻词汇以及录入存储中英文资料等问题,本文以DSP(Digital Siggal Processor)为核心处理器研发了一套电子阅读笔系统.该系统将光学扫描、脱机文字识别和中英互译技术嵌入小型设备,实现了印刷体文字从扫描、识别到翻译的全部功能.实验表明该系统设计方案可行,工作稳定.文中介绍了硬件和软件系统的设计和构成,并详细讨论部分算法的实现原理. 相似文献
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Nakamura Yoshikatsu Suda Masato Sakai Kunio Takeda Yoshihiro Udaka Makoto 《Industrial Electronics, IEEE Transactions on》1986,(2):144-147
A high-performance optical character reader (OCR) capable of reading low-quality stamped alphanumeric characters, on a metal rod, is described in this paper. Reliable and precise recognition is achieved by means of a special scanner and dedicated recognition module. The scanner revolves around the metal rod and detects characters, thus avoiding rotation of the heavy and long rod. Diffused illumination which produces a clear image, a powerful pattern-matching method?the Multiple Similarity Method (MSM)?implemented by the recognition module, and the use of adaptive rescan control results in a correct recognition rate of 99.93 percent. One recognition module can process images from up to five different scanners. The processing speed is about 1.5 s/rod. The design and industrial application of the system are discussed. 相似文献
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本文提出了一种全新的手指书写虚拟文字识别系统,该系统利用摄像头捕捉人手指的运动轨迹,通过手指跟踪及检测算法,恢复出手指虚拟"书写"文字的二维图像数据(称之为虚拟文字),再进行识别输出.文中对单层函数连接神经网络进行改进并用来进行高准确度的运动手指尖的预测及跟踪,给出了一种基于数学形态学及模板匹配的简单有效的手指检测方法,提出了基于运动手指跟踪的"虚拟文字"恢复方法.实验结果表明:系统方案可行,手指跟踪及检测准确率高,对手指"书写"的数字、英文等虚拟文字识别率能达到95%以上. 相似文献
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This paper is completely tutorial in character and its sole objective is to provide the network-oriented reader with a clear and detailed presentation of the theoretical ideas underlying the insertion-loss approach to the approximation-synthesis problem of doubly resistor terminated filters. The treatment, which is leisurely and thorough, interleaves several key theorems in a systematic manner. 相似文献
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基于TW2824的视频监视及OSD叠加 总被引:2,自引:0,他引:2
在实际应用中,有对多路摄像信号采集并在一个显示设备中分割区域显示多幅图像及添加相应OSD字符信息的需要,TW2824是一款强大的视频控制器。以采集2路全电视信号为例,详细叙述由单片机控制,运用TW2824采集2路视频信号,经内部视频控制分割显示到1块液晶屏中的原理过程。详细叙述利用TW2824支持的OSD覆盖技术,在视频层上添加中英文字符OSD覆盖的原理过程。最终实现在一个液晶屏上监视显示2个模拟视频源信号,并叠加相应的中英文字符信息。 相似文献
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Based on the recognition requirement to suppress types of noise created in the conversion process of handwritten characters
into binary patterns in our optical character recognition, an algorithm of processing digital character noise is presented.
The software and hardware of the algorithm is described. 相似文献
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反射型LCOS显示板用于人眼波前像差校正的研究 总被引:1,自引:0,他引:1
采用基于硅基板的反射型液晶显示器件(LCOS)进行人眼波前像差校正的研究.理论分析了LCOS显示器件的光学调制特性,在合适的参数条件下,LCOS可工作在偏相位调制状态下.LCOS作为波前校正器和哈特曼传感器结合构成一个自适应闭环校正系统,校正在成像光路中引入的具有人眼波前像差特点的静态波前畸变,实验结果标明LCOS可以有效地校正光学成像系统中的波前畸变,校正后像差的RMS值小于0.1 μm.LCOS器件作为相位校正元件在人眼波前像差校正和视网膜成像系统中具有良好的应用前景. 相似文献
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Partha Bhaumik Shuqiang Zhang Pulak Chowdhury Sang-Soo Lee Jong Hyun Lee Biswanath Mukherjee 《Photonic Network Communications》2014,28(1):4-18
This paper gives an overview of software-defined optical networks (SDONs). It explains the general concepts on software-defined networks (SDNs), their relationship with network function virtualization, and also about OpenFlow, which is a pioneer protocol for SDNs. It then explains the benefits and challenges of extending SDNs to multilayer optical networks, including flexible grid and elastic optical networks, and how it compares to generalized multi-protocol label switching for implementing a unified control plane. An overview on the industry and research efforts on SDON standardization and implementation is given next, to bring the reader up to speed with the current state of the art in this field. Finally, the paper outlines the benefits achieved by SDONs for network operators, and also some of the important and relevant research problems that need to be addressed. 相似文献
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A Single-Chip CMOS Transceiver for UHF Mobile RFID Reader 总被引:4,自引:0,他引:4
Ickjin Kwon Yunseong Eo Heemun Bang Kyudon Choi Sangyoon Jeon Sungjae Jung Donghyun Lee Heungbae Lee 《Solid-State Circuits, IEEE Journal of》2008,43(3):729-738
This paper describes a single-antenna low-power single-chip radio frequency identification (RFID) reader for mobile phone applications. The reader integrates an RF transceiver, data converters, a digital baseband modem, an MPU, memory, and host interfaces. The direct conversion RF receiver architecture with the highly linear RF front-end circuit and DC offset cancellation circuit is used to give good immunity to the large transmitter leakage. It is suitable for a mobile phone reader with single-antenna architecture and low-power reader solution. The transmitter is implemented in the direct I/Q up-conversion architecture. The frequency synthesizer based on a fractional-N phase-locked-loop topology offering 900 MHz quadrature LO signals is also integrated with the RF transceiver. The reader is fabricated in a 0.18 mum CMOS technology, and its die size is 4.5 mm times 5.3 mm including electrostatic discharge I/O pads. The reader consumes a total current of 89 mA apart from the external power amplifier with 1.8 V supply voltage. It achieves an 8 dBm P1dB, an 18.5 dBm IIP3, and a maximum transmitter output power of 4 dBm. 相似文献
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一种用于光纤监控电视系统的实时日历时钟字符添加器 总被引:1,自引:0,他引:1
本文扼要介绍一种由MCS-51系列单片机组成的用于光纤监控电视系统的实时日历时钟字符添加器。该字符添加器充分利用了MCS-51系列单片机的各种资源和优势,使电路大大简化,具有结构合理、简单,工作可靠,造价低等特点。 相似文献
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介绍了一种摄远型长波红外消热差物镜的设计方法.将摄远物镜模型与消热差模型相结合,推导出之间的光焦度分配关系,并将二者统一起来,直接得到摄远型消热差物镜的光焦度分配关系式.首先,根据摄远物镜的设计方法进行物镜的设计,在满足远摄比的情况下结合像差理论合理选择最优的前组和后组光焦度解;然后采用光学被动消热差方法,进行消热差设计,选择材料组合,分配组元内部各透镜的光焦度;最后利用计算机辅助软件进行像差校正.为了验证该方案的可行性,设计了一个工作于8~12 m,焦距100 mm,F数为2.0,全视场角为6,远摄比达到0.8的长波红外消热差光学系统.在-40~60 ℃温度范围内,成像质量稳定,调制传递函数(MTF)接近衍射极限,并且体积小、结构简单,质量轻.所设计系统优化后的光焦度分配值和初始计算值非常接近. 相似文献