Device and method for detecting surface quality of printed matters

Abstract

The invention discloses a device and a method for detecting surface quality of printed matters. The device comprises parallel and uniform high-brightness light sources, wherein the parallel and uniform high-brightness light sources are used for transmitting uniform parallel high-brightness light to a detection area; an incident angle of parallel high-brightness light emitted to the surfaces of the printed matters in the detection area is an acute angle; an image acquiring device is used for receiving light transmitted by reflecting the light transmitted by the parallel uniform high-brightness light sources through the surfaces of the printed matters in a detection area; and an included angle between an optical axis of an acquiring terminal of the image acquiring device and a normal line of a plane where the detection area is positioned is equal to the incident angle of the parallel high-brightness light. The method based on the device comprises the following steps that the parallel and uniform high-brightness light sources transmit uniform parallel high-brightness light to the surfaces of the printed matters in the detection area; reflected light formed by reflecting the parallel high-brightness light through the surfaces of the printed matters in the detection area is acquired by the image acquiring device; and by comparison, the shot surface image and the corresponding standard surface image are subjected to quality detection. The device and the method provided by the invention can be used for carrying out quick and accurate surface quality detection on various flat curved printed matters.

Description

technical field [0001] The invention relates to a printed matter surface quality detection device and a detection method based on the printed matter surface quality detection device, belonging to the field of printed matter detection. Background technique [0002] In recent years, with the continuous improvement of detection technology and the increasing abundance of materials, in order to enhance the visual effect or enhance certain characteristics of the surface (such as wear resistance, corrosion resistance, etc.), the surface of printed matter often needs to be covered with multi-layer materials. If there is an error in the printing process, the coating of the medium on the surface of the printed matter does not match the design, which will not only affect the appearance of the printed matter, but also affect the corresponding characteristics of the printed matter. Therefore, it is necessary to test the surface of the printed matter to ensure the quality. [0003] At pre...

AI Technical Summary

Problems solved by technology

However, this device can only detect color defects on the surface of printed matter, and cannot detect gloss-related defects on the surface of printed matter, such as missing transparent media (such as varnish, film), scratches, bumps, bumps, and pattern overprinting. quasi-defects, not to mention the detection of gloss-related defects on the surface of printed matter while detecting color defects

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