【作者】 李貌；

【导师】 汪仁煌；

【作者基本信息】 广东工业大学 ， 检测技术及自动化装置， 2006， 硕士

【摘要】 仪器仪表被广泛地应用于各个行业中测量系统中,由于某些仪器仪表并没有提供数据传送的接口,要实现自动化,需要利用摄像技术、图像处理技术、图像识别技术以及通信技术,来实现仪器仪表读数识别具有的实用价值。 本文首先分析了数字识别的现状以及发展趋势,针对数字识别系统的研究,介绍了系统的硬件和软件平台,有利于数字识别系统的应用研究。在图像采集方面,直接采用USB摄像头,省去采集卡,降低了成本;针对体温计图像,采取了合理的图像增强、图像去噪、图像分割等预处理技术,以利于后续的处理。采用图像梯度结合先验知识来分割图像,取得了良好的效果;在图像二值化方面,采用了基于边缘检测和种子填充的二值化分割方法,对canny算子、种子填充给予了详细的介绍,并给出了处理结果,这种二值化分割方法分割准确、适应性强,对于较暗、较亮,及反色图像都能较准确的分割;采用BP神经网络实现数字识别,提高了识别率。 本文针对的是没有数字输出接口的体温计显示数字图像,给出了实现机器视觉识别的流程图,以实现智能马桶的应用中的体温计数据的自动采集,具有实际应用价值。在体温计显示数字图像预处理、分割、二值化方面具有特色。 最后,对本文的工作进行了总结,提出了存在的问题和进一步改进的方向。更多还原

【Abstract】 Instrument is used in measure system widely in many industries, as for some instruments that have no interface to send data, in order to automation, image sampling technique, image processing technique, image recognition technique and communication are required. So instrument recognition is very valuable.This thesis analyzes the current condition and development trend of digit recognition firstly, introducing the platform of hardware and software, facilitate the application research of digit recognition system. Image getting uses USB camera directly, cut down the cost in some degree. Some measures are taken to preprocess thermometer image, such as image enhance, image denoising, image segmentation and so on. Image gradient and previous experience technology are taken to segment image, the method is very effective. Edge detection and seed filling algorithm are taken to binarize the image, introducing canny operator and seed filling. This binarization method is precise and flexible, not only to normal image, but also to brighter and darker image. BP neural network is used to recognize digit, this improves the recognition rate.The object of this thesis is the digital image of thermometer having no data output interface and used in intelligent toilet, processing flowchart and steps are given, accomplishing data automatic sampling, having very high application value. In the digital image sampling, segmentation and binarization there is own characteristic.In the end of this thesis, concluding the total contents, pointing out the current problems to be resolved.更多还原