Verification temperature character identification method of glass thermometer

A glass thermometer, character recognition technology, applied in character recognition, character and pattern recognition, calculation and other directions, can solve problems such as boring, reduce verification accuracy and efficiency, and unsatisfactory effect, and achieve the effect of improving work efficiency

Inactive Publication Date: 2016-06-08
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

These tasks are not only boring, but more importantly, the accuracy and efficiency of the verification are seriously reduced, and the manual readings are greatly affected by the verification personnel, and the personal quality requirements of the verification personnel are relatively high.
Moreover, the existing fuzzy image recognition technology does not achieve satisfactory results in the recognition of the verification temperature of the glass thermometer.

Method used

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  • Verification temperature character identification method of glass thermometer
  • Verification temperature character identification method of glass thermometer
  • Verification temperature character identification method of glass thermometer

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Experimental program
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Embodiment

[0103] When the present invention collects the fuzzy image of the thermometer, the signal noise generated in the fuzzy image collection process can be solved by corresponding signal processing algorithms such as digital filtering algorithm; and the distortion caused by the change of the viewing angle when collecting the image mainly comes from Due to the parallax when the camera is imaging, the distance between the scale lines of the thermometer in the fuzzy image is uneven. In addition, the thermometer itself is not a plane, and the characters on the thermometer will inevitably be distorted during the imaging process. The thermometers submitted for inspection are usually thermometers used by customers, so the lines on the thermometers to be inspected are often missing, such as missing scale lines, missing characters, etc., resulting in "occlusion" problems. In the actual verification process, the most important problem is the "occlusion" problem. In some extreme cases, thermo...

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Abstract

The invention provides a verification temperature character identification method of a glass thermometer. The method comprises the following steps that a fuzzy image of the glass thermometer is acquired, and edge detection is performed on the fuzzy image; contour tracking is performed on the fuzzy image after edge detection; contour fuzzy feature identification method points of the fuzzy image are sampled; a distance distribution matrix and an angle distribution matrix of all the contour fuzzy feature identification method point pairs are calculated; fuzzy nearness histograms of all the contour fuzzy feature identification method points are calculated so as to form a fuzzy nearness matrix; and difference of fuzzy nearness of any two points between two fuzzy images is calculated to act as a cost matrix, and a template character of the minimum value of the lowest matching cost is selected to act as an identification result. According to the method, fuzzy nearness number repairing is performed on missing numbers by adopting the fuzzy mathematic theory so that rate of identification is about 96% and reading accuracy of the thermometer can be 95%.

Description

technical field [0001] The invention relates to a verification and recognition method for a standard constant temperature bath thermometer, in particular to a verification temperature character recognition method for a glass thermometer. Background technique [0002] Character recognition is an important branch in the field of pattern recognition. It is the application of pattern recognition technology in the field of fuzzy image processing, and it is the combination of fuzzy image processing technology and pattern recognition technology. In 1929, the German scientist Tausheck first proposed the concept of OCR (Optical Character Recognition, Optical Character Recognition). The software converts the text in the blurred image into a text format, so that the word processing software can further edit and process the system technology. The character recognition algorithm is the core technology of this technology, and the correct rate of the character recognition algorithm determ...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/46
CPCG06V10/44G06V30/10G06F18/00
Inventor 钟汉如
Owner SOUTH CHINA UNIV OF TECH
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