【作者】 朱亦佳；

【导师】 梁忠诚； 钱晨；

【作者基本信息】 南京邮电大学 ， 光学， 2011， 硕士

【摘要】 传统光学条码成本低、易于制作和灵活实用等特点使其在众多领域得到了广泛应用。本文根据照相机的散焦特性,提出并制作了一种新颖的有源微型光学标签系统,能方便地实现对微型光学标签在较远距离的读取和识别。本系统发射端集成了LED、透镜和微型二维码,成像部分采用散焦照相机镜头,以实现在较远距离处接收放大的二维条码图像,进而实现正确解码。通过仿真和实验,重点研究了相机镜头的参数与光学标签发射端透镜焦距和孔径以及发射光源的相互影响。信息编码方式选用具有超高速全方位识读和高效表示汉字优点的QR Code。包含信息的微型二维码分别使用照相和光绘机的制作方法,以实现码元单元尺寸在毫米量级以下,因后者制作的微型二维码更清晰,本文将其作为微型二维码的首选方案。本文主要的工作和创新之处,首先提出了一种新的标签系统,克服了传统光学条码标签面积大、容量小、易污损、工作距离短的不足。并在此基础上设计了一种类似于LED结构的集成微型可视化标签系统,以简化加工工艺缩减制作成本,以便于大规模生产。利用光绘机制作微型二维码。利用光绘机精度高、加工方便和污损少的优点,成功制作了高密度价格合理的微型二维码,其最小码元可达870μm,使进一步集成化和增加探测距离成为可能。更多还原

【Abstract】 The new optical system of micro visual tag is based on the principle of defocus blur. Unlike current optical tag, such as barcodes, must be read within a short rang and the codes occupy valuable physical space on products, this tag can be shrunk to several millimeters and captured from a distance of over 0.1 meters. It is integrated with LED, lens and the 2D barcode mask to form an active signal transmitter. Taking using of the camera out of focus, the users are able to detect small optical tag from a relatively large distance and get an amplificatory image. The image is accurately decoded to access to information. The parameters of the transmitting terminal are related to the parameters of camera lens. The simulations and experiments show that the aperture, focal length and light source have influence on the detection range. For the virtues of QR Code such as High-Speed omnibearing reading and high-efficiency coding Chinese character, it is selected as the mode of information encoding.The primary content and innovation of the dissertation includes the follows. Firstly, this paper puts forward a new tag system. It is different from the traditional barcode which has the flaws such as occupying too much space, low amount of information, easy defilement and short detecting range. The advantages of the tag such as large amount of information, security and cheapness make it possible to provide an effective supplement to radio frequency tags. Secondly the integrated micro visual tag like LED simplifies the process and reduces the production costs. This creates the condition for future large-scale 1 and application. At last we produce the mask by photoplotter. With the advantages of high accuracy, processing convenience and less fouling, the photoplotter can produce high-density mask whose smallest symbol is up to 870μm, so it is possible to enhance the integration and increase the detection range.更多还原