A machine vision-based method for glue offset detection of thermal transfer film

Abstract

The invention relates to a method for detecting the offset of heat transfer film glue based on machine vision, which comprises the following steps: S1, setting a film width qualified threshold; 2, obtaining a backlight image of that thermal transfer film; S3, deducting the film in the image; S4: obtaining a picture glue layer by image clustering; 5, calculating the widest direction width of the glue lay; S6: comparing the width and outputting the detection result, comparing the glue width of the currently obtained film with the width qualified threshold value, and evaluating the film as defectif the glue width is greater than the threshold value, otherwise evaluating the film as qualified. The invention has the advantages of high accuracy, repeatability, avoidance of false detection and missed detection caused by fatigue of workers, low cost, easy statistics and the like.

Description

technical field [0001] The invention relates to the technical field of thermal transfer film detection, in particular to a machine vision-based method for detecting glue deviation of thermal transfer film. Background technique [0002] Thermal transfer printing refers to printing the ink on the transfer medium (including thermal transfer paper or thermal transfer film), and then the transfer medium printed with graphics and texts is in close contact with the substrate, through a certain ambient temperature and external pressure. , so that the graphics and text are transferred to the substrate to form the final printed product. Thermal transfer printing technology was introduced into my country in the late 1980s and early 1990s, and developed rapidly in China, with a wide range of applications. [0003] The most classic use of thermal transfer technology is in textile printing production. With the gradual improvement of domestic transfer printing ink generation technology, t...

AI Technical Summary

Problems solved by technology

[0007] (1) Workers have been working repeatedly in the same environment for a long time, and observe the surface of the film to be inspected through eyes. There is a certain degree of reflection on the surface, and the defects in the small size of the film are often relatively subtle, which makes people easily fatigued physically and mentally, resulting in false inspections, missed detection

[0008] (2) Due to the strong subjectivity of people, it is difficult to form a consistent detection standard

[0009] (3) People are easily disturbed by the external environment and internal factors, which affect the pass rate of product testing

[0010] (4) With the continuous increase of labor costs, the product processing cost of enterprises will be greatly increased

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