The Research Of Visual Inspection System For Glass Thermometer Indication

In the development of science and technology under the background of modern detection technology developed continuously. Glass thermometer as an integral part of modern detection technology, temperature measurement tool is widely used in various fields. In the field of shipbuilding industry, machinery processing, petrochemical and other glass thermometer is applied, its demand and usage are very great. But the thermometer in a glass tube while bringing convenience to people, its periodic verification has many difficulties for related verification department. Due to the huge number, verification personnel workload increases, and methods for detecting is to rely on artificial and the reading telescope to realize the thermometer read, reading error is inevitable, verification quality problems follow.This paper presented in the above problems to study and solve, the traditional temperature measurement cost of human resources, manual access to more information, but also easy to have a certain impact on reading. If the computer read method, not only reduce the labor cost, enhance the work efficiency, also can ensure the accuracy and real-time performance of the number. The glass thermometer for structural analysis, combined with the experimental environment, formulated the this paper. This system can be divided into three parts. The first part is the built environment, comprehensive theoretical algorithm analysis, build a suitable hardware environment, industry needs to read the thermometer were simulated Platform; the second part is the interception of the image of thermometer. The thermometer occupied the whole picture of the area is not great, according to characteristics of the thermometer in the image presentation level, on the thermometer of gray extremum arithmetic and the vertical projection is determined the thermometer on the lower edge of the, put the thermometer from the image cropped out to facilitate the thermometer to do further analysis; the third part is analysis of scale lines and character and liquid column. Scale line in the cropped image of thermometer showing characteristics of the perpendicular and straight, according to the characteristics of cutting image processing. Similarly liquid column method. The character is a computer vision detection part of the difficulty in Daily application is more extensive, such as vehicle license plate recognition, electronic components anti character stencil etc. have been applied. The character recognition and location of long lines, to read the scale shows the number of purposes.Through the operation of the system, proved this system on the accuracy of glass thermometer real-time readings and real-time. To verify the performance of the detection system, which can be widely used in the field of glass tube thermometer real-time detection.