Method and device for detecting character size

Abstract

The invention discloses a method and device for detecting a character size. The method comprises the steps: acquiring 3D contour data of the surface of an engraved code character; calculating data ofa geometric surface on which the character is located from the contour data; extracting point cloud data of an engraved character with depth or height information; extracting a single character and carrying out statistics of the geometric size of each character; and outputting a result. Besides, the device includes a 3D contour measuring unit, a guide rail, a rail fixing unit base, a motor, a motor driving unit, a displacement sensor and a processing unit. According to the invention, with full-automatic detection of the depth or height of the engraved character, the character size and adjacentcharacter spacing, the manual testing costs of the motor vehicle VIN code, engine number and the like in the motor vehicle manufacturing and inspection fields can be reduced; the detection accuracy and detection efficiency can be improved; and thus the method and device for detecting a character size have the great significance in promoting the inspection automation in the industry.

Description

technical field [0001] The invention relates to the technical field of character size detection, in particular to a method and device for character size detection. Background technique [0002] The traditional motor vehicle VIN code and engine number detection mainly rely on manual visual inspection and measurement with dial indicators and rulers. Typically, many car manufacturers use a dial indicator with a probe to detect the depth of the VIN code and engine number. Since the tip of the probe has a certain thickness, it cannot detect the depth of the details of the character gully, and the amount of human pressure will also seriously affect the detection results. In short, this traditional detection method has problems such as high labor cost, low efficiency, poor quantification accuracy, subjectivity, and easy omissions. Although there are a small number of inventions that have made some technical improvements to this problem, they are still manual operations in essence...

AI Technical Summary

Problems solved by technology

Since the tip of the probe has a certain thickness, it cannot detect the depth of the details of the character gully, and the amount of human pressure will also seriously affect the detection results

In short, this traditional detection method has problems such as high labor cost, low efficiency, poor quantification accuracy, subjectivity, and easy omissions.

Although a small number of inventions have made some technical improvements to this problem, they are still manual operations in essence. It takes a few minutes to detect an engraved code on average, which is time-consuming and labor-intensive, and has not fundamentally changed this situation.

With the increase in car ownership and sales, the workload of motor vehicle manufacturers and annual inspection agencies to detect VIN codes and engine numbers has also increased rapidly. The traditional manual detection method can no longer meet the needs of the work.

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