The Design For Digital Detection System Of Liquid Columnar Thermometers

Liquid columnar thermometer is one of the most familiar tools in daily life. The traditional detection of thermometer is very time-consuming, fussy and vapidity. The error of manual detection is so big. And non-manipulative errors are very many. So it requires an automatic detecting method bases on computer. To resolve forenamed issue, this article advances a digital detection system.Digital detection system of liquid columnar thermometers is an automatic detection system. It can identify the scales and columns of thermometers on digital images, and more it's able to numerate the current value of temperature. Its design depends on ways and means of digital image processing and recognition to improve the traditional method of detection.First, it analyzes the design of digital detection system. It includes four modules: image taking, preprocessing, processing and recognition, and involves image scaling, translation, rotation, graying of color image, elimination of noise, histogram processing of gray image, distilling of character, image binarization, image recognition and digital recognition etc.Second, it researches, analyzes, explores and concretely realizes the basic theories and technologies of image processing in this system deeply. It advances some relevant ways and designs to resolve actual issues. Moreover, it brings some new blue prints for the key steps to quicken the processing and make the results better. The rotation in geometrical transform and the image binarization with threshold are been effective improved.Finally, it makes a software of digital detection system using the object-oriented development, and tests the software with 10 camera images in the experiment. It obtains the results, and validates the veracity of this system more.