电接风向风速自记纸数字化处理系统的设计与实现

纸质记录曲线的识别和数字化是图像处理和模式识别领域的一项重要内容, 是对气象档案馆保存的气象纸质曲线资料数字化的有效方法。该文研究并构建了电接风向风速自记纸数字化处理系统, 该系统主要包括4个处理阶段:自记纸图像的输入、图像预处理、自记曲线的分割、曲线的跟踪和识别。其中, 自记纸图像的输入应用TWAIN (Toolkit Without An Interesting Name, 无注名工具包协议) 标准来设计, 对记录曲线的跟踪识别, 该文提出的基于灰度积分投影的分段线性插值算法, 取得了很好的识别效果。

Contact Anemometer Self-recording Records Digitization Processing System Design and Realization

Contact anemometer self-recording instrument is the main wind measurement equipment in meteorological department. In the past, identifying the automatic recording curve is mainly depended on manual work. It is impossible for manpower to obtain all wind data because of the tremendous workload. Therefore, it is essential to design an automated processing system for self-recording curve to save the precious wind data. The wind data denoted by anemometer automatic recording curve are withdrawn by automated processing system making use of pattern recognition technique and digital image processing method.The digitization of paper-based record curve is a very significant research task in the field of pattern recognition. The technique of recording curve digitization has a wide application prospect; it can be applied to many different fields such as medical treatment, meteorological data and so on. A digitized processing system for contact anemometer self-recording curve of wind in the field of meteorological data is studied and implemented. The digitization process can be divided into four stages:curve image inputting, preprocessing of curve image, curve image segmentation, and curve tracking and recognition.The TWAIN standard compile image scanning program for scanner is applied by the automated processing system. The programming connection is provided by the TWAIN standard that imaging applications is allowed to communicate with scanners and digital cameras. In the process of preprocessing of curve image, median filter and regulated straight square drawing are introduced. In the curve image segmentation step, the traditional method of gray level threshold segmentation and color space segmentation is elaborated. In the step of curve tracking and recognition, a new method of contour tracing to extract the data in the curve image is presented. The wind speed data can be extracted more quickly and rightly by this method based on these characteristics of the wind speed curve image.The method mentioned above has practical signification. The system is tested by the consumers, and it has excellent effect.