基于GL847控制器的航片扫描仪控制程序设计与实现

发布时间：2018-01-17 03:19

本文关键词：基于GL847控制器的航片扫描仪控制程序设计与实现　出处：《西安电子科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：航片扫描仪作为一种图像输入设备，具有精度高、数据量大和价格昂贵等特点，主要是为全数字摄影测量、遥感、地理信息系统(GIS)等需要高精度航片数字化影像的领域而设计的。目前，航片扫描仪已经成为测绘部门必备的图像扫描输入设备，且需求量旺盛，然而主流的航片扫描仪依然是采用国外进口并且价格昂贵，因此开发一款自主高精度、高性价比的航片扫描仪已经成为迫在眉睫的需求。扫描速度是航片扫描仪的一个关键性指标，为此，本文分析了HG4000型航片扫描仪，，找出其扫描速度慢的根源，提出了一种高速高精度航片扫描仪控制系统设计方案，采用此种方案研制了新型的HG5000型航片扫描仪。在新的方案中，首先采用新型GL847控制器取代性能低下的LM9833控制器，从硬件上提升数据处理性能；其次，将系统分为三层结构，将主要数据处理任务设置在扫描仪内部的驱动层，使得扫描工作不受用户PC干扰；最后采用多线程技术，使得多路图像采集子系统能并行工作，极大地提高了系统资源的利用率。由于航片扫描仪对精度的特殊要求，本文提出了一种精度提升的算法。最后，为了提升扫描图像的质量，根据校正的理论，设计出一套适应该航片扫描仪系统的校正方法。
[Abstract]:As a kind of image input equipment, aerial film scanner has the characteristics of high precision, large amount of data and expensive price. It is mainly used for digital photogrammetry and remote sensing. Geographic Information system (GIS) and other fields need high-precision aerial digital image design. At present, aerial scanner has become the necessary image scanning input equipment of surveying and mapping department, and the demand is exuberant. However, the mainstream aerial film scanner is still imported from abroad and expensive, so it has become an urgent need to develop an independent high precision, high cost effective aerial film scanner. The scanning speed is a key index of the aerial film scanner. Therefore, this paper analyzes the HG4000 aerial film scanner and finds out the root cause of its slow scanning speed. A design scheme of high speed and high precision aerial film scanner control system is presented. A new type of HG5000 aerial film scanner is developed by using this scheme. In the new scheme, a new type of aerial film scanner is developed. Firstly, a new type of GL847 controller is used to replace the low performance LM9833 controller to improve the performance of data processing in hardware. Secondly, the system is divided into three layers, and the main data processing task is set in the driving layer of the scanner, so that the scanning work is not interfered by the user PC. Finally, multi-thread technology is used to make the multi-channel image acquisition subsystem work in parallel, which greatly improves the utilization rate of system resources. Due to the special requirements of aerial scanner for accuracy, this paper proposes an algorithm to improve the accuracy. Finally, in order to improve the quality of scanning image, according to the theory of correction. A set of calibration methods suitable for the aerial scanner system is designed.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP334.22;TP391.41

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