1 西安工业大学，陕西西安710032
2 中国航空工业洛阳电光设备研究所, 河南洛阳 471009
针对平视显示器调试过程中视差检测主观性大，不能给出精确量的问题。基于机器视觉，研制了一套平视显示器视差检测装置。装置采用传统光学系统，利用CCD光电耦合器件手动调节，将大视场平行光管十字分划成像，对图像做处理，计算给出视差值。用装置和摆头法测试结果进行比较，结果表明该测试系统提高了平视显示器视差检测的精确度，整个系统的测量精度为28″。
平视显示器 CCD器件 视差 机器视觉 head-up display CCD parallax machine vision.
1 西安工业大学光电学院，西安710032
2 中国航空工业洛阳电光设备研究所，河南洛阳471009
针对平视显示器现场调试过程中视差检测存在主观性大、不易给出定量结果的问题，研制了一套用于平视显示器视差自动检测装置。本装置采用传统光学系统，利用CCD光电耦合器件将大视场平行光管分划像清晰成像，放入被测平显，再次将分划成像，并对此图像进行处理。通过自制计算软件，计算给出视差调节量，从而进行自动检测。利用这一装置与未采用自动对焦视差检测系统及摆头法3种方法进行测试对比。结果表明自动视差测量装置的检测精度最高，并具有良好的可重复性。整个系统的测量精度为28″。
平视显示器 视差 自动对焦 自动检测 head-up display parallax auto-focusing automatic detection
Author Affiliations
Abstract
Key Laboratory of Information Photonics and Optical Communications (IPOC), Ministry of Education (MOE), Beijing University of Posts and Telecommunications, Beijing 100876, China
A new blind frequency offset estimation method based on cyclic prefix and virtual subcarriers in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system is presented. It is able to estimate the fractional part and integral part of frequency offset at the same time. Its estimation range is about [?3.5 GHz, 3.5 GHz]. The influence of the integral frequency offset is comprehensively analyzed in COOFDM system. Its performances in the additive white Gaussian noise (AWGN) channel and the dispersive channel are investigated, respectively. Simulation results indicate that even in the dispersive channel, when the optical signal-to-noise ratio (OSNR) is low, it can still work very well.
盲估计 频偏 循环前缀 虚载波 060.0060 Fiber optics and optical communications 060.1660 Coherent communications 060.2330 Fiber optics communications 060.5060 Phase modulation Chinese Optics Letters
2010, 8(9): 888
