Image fuzzy identification method of standard constant temperature bath glass thermometer

Abstract

The invention brings forward an image fuzzy identification method of a standard constant temperature bath glass thermometer. The method comprises the following main steps: acquiring a fuzzy image of the thermometer, converting the acquired fuzzy image into a gray-scale map, performing threshold processing on the gray-scale map; performing rotation correction on the fuzzy image after the threshold processing, and obtaining a liquid column position of the thermometer by use of a projection method; segmenting the fuzzy image after the rotation correction to obtain a graduation line subarea, a liquid column subarea and an indication character subarea; performing morphological processing on the subareas to obtain pixel coordinates of a graduation line and a liquid column fixed point; and performing character search on the indication character subarea to identity characters and obtain temperature information of the graduation line, and finally obtaining an indication temperature of the thermometer in the acquired fuzzy image. According to the invention, thermometer characters are identified by use of a fuzzy closeness algorithm, fuzzy closeness digital repair is performed on incomplete digits, correct identification of incomplete characters is realized, the correct rate of the identification is about 96%, and the thermometer reading accuracy can reach 95%.

Description

technical field [0001] The invention relates to a non-digital image fuzzy recognition method for a glass thermometer used in a standard constant temperature bath. Background technique [0002] The glass liquid thermometer refers to a measuring instrument that uses the effect of thermal expansion and contraction of the temperature-sensitive liquid in the transparent glass temperature-sensitive bulb and capillary with the change of the temperature of the measured medium to measure the temperature. In 1593, the famous scientist Galileo invented the first temperature measuring instrument by using the thermal expansion and contraction of air; in 1631, the French chemist Jean Rey used water as the temperature-sensing liquid to create the prototype of the modern thermometer; in 1659, the French astronomer Bo Ryan made the first mercury thermometer using mercury as a temperature-sensing liquid. For centuries, humans have used mercury thermometers or alcohol thermometers as their pr...

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Problems solved by technology

[0014] The application number is CN201110131986.2, and the invention patent application titled "a standard constant temperature bath touch screen intelligent measurement and control and automatic measurement verification system" refers to a standard constant temperature bath touch screen measurement and control and automatic measurement verification device, which is mainly set through the program Heating, collecting, identifying, comparing, and processing data, and automatically complete the verification of various temperature instruments under test, which is suitable for the verification temperature field with small fluctuations in temperature rise; but there is no automatic identification method for glass thermometer readings, and there is no automatic Reading function

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