【作者】 汪宏志；

【导师】 倪旭翔；

【作者基本信息】 浙江大学 ， 光通信， 2008， 硕士

【摘要】 图像信息技术是信息领域包含信息量最大最重要的分支之一,在许多重要的应用领域,固体图像传感器的动态范围起着至关重要的作用,所以扩展固体传感器的动态范围是获取更多图像信息的重要手段之一。本课题研究一种大动态范围的成像(HDRI,Hign Dynamic Range Image)技术,它采用空间光调制器和固体图像传感器相结合,根据固体图像传感器的输出信号调节空间光调制器的调制深度,组成一个负反馈闭环控制系统,达到扩展固体成像器件动态范围的目的。论文的主要工作有:(1)在总结分析了现有扩展固体图像传感器动态范围扩展的基础上,对系统的反馈过程进行了分析及仿真,当在一定的反馈深度范围内时,确认采用直接反馈控制的可行性,为脱机HDRI系统方案提供了理论依据以及可行性。(2)根据HDRI系统需求,比较多种方案的基础上,提出了基于FPGA为核心的HDRI系统。(3)结合FPGA和HDRI系统,完善了整个系统的外围电路及功能模块规划,完成了整个方案的器件选型、电路设计、加工以及调试。(4)初步完成了HDRI系统各功能单元的测试,完成了基于FPGA的图像采集、数据传输、数据缓冲以及标准的XGA格式的视频差分信号输出。实验结果表明,各功能模块能满足HDRI系统的要求,达到了预期的效果。更多还原

【Abstract】 Image information is one of the information technology branches which include the most part of information field. In many important applications, the dynamic range of solid-state imaging sensors is critical. As a result, the extension of dynamic range of solid-state imaging sensors is one of the key methods to extract more information from imaging.This project developed a high dynamic range imaging (HDRI) system based on spatial light modulator and solid-state imaging sensors. The depth of modulation of spatial light modulator is determined by the output of solid-state imaging sensors. Hence, a negative-loop control system is constituted to extend the dynamic range of solid-state sensors. This thesis includes the following parts:(1)Based on summing up and analyzing expansion dynamic range of the existing solid image sensor, the feedback control is analyzed and formulated. The feasibility of direct feedback control is studied with simulation. The range of feedback depth is discovered for the convergence of output images.(2) According to the requirement of HDRI system, FPGA is selected as a main-controller based on comparing with schemes.(3) According to HDRI and FPGA, peripheral circuit is drawn and module is laidout.Chip selecting and circuit designs are accomplished.(4) Function module of HDRI system is debugged elementary .And data acquired,processed and transferred in ping-pong mode based on FPGA is achieved.Experiment indicates that function module of HDRI system meet the demand of HDRI system and forecast resulets are achieve.更多还原