Imaging method and device used for thermal-state cylindrical long product surface quality visual detection

Abstract

The invention discloses an imaging method and a device used for thermal-state cylindrical long product surface quality visual detection. The imaging device comprises a plurality of imaging units, a control system, and a synchronous adjusting mechanism; position parameters, needed to be adjusted, of the imaging units are obtained via calculation by the cylindrical long product outer diameter control system via the synchronous adjusting mechanism; and automatic adjusting of the imaging units is realized via the synchronous adjusting mechanism. The imaging method and the device can be used for detecting surface quality of cylindrical long products of different types of a same unit; a visual detection system can be used for adjusting the position of the imaging units based on the outer diameter of the cylindrical long products, so that distance from an imaging sensor to the surfaces of the cylindrical long products is maintained to be constant, stable high-quality images are obtained, stable on-line detection of the surface quality of the thermal-state cylindrical long products is realized, surface defects of the cylindrical long products are discovered in time, batch defects are reduced, and finished product yield is increased.

Description

technical field [0001] The invention relates to a machine vision detection method and device, in particular to a visual detection method and device for cylindrical long material surface quality. Background technique [0002] Machine vision inspection technology is an important means widely used in product surface quality inspection in recent years. This technology obtains the image of the surface of the object to be inspected, analyzes and recognizes the image, and evaluates the surface quality of the product accordingly. The acquisition of the surface image of the test object is a very important link in the visual inspection system, and it is also the key to whether the visual inspection system can successfully realize its functions. The acquisition of a clear image of the measured object depends on the stability of the technical parameters of each key device in the detection system and the measured object. However, due to changes in production conditions and processes, th...

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Problems solved by technology

The applicant is an OG company that conducts international wire detection technology research, and the invention title is "A method and apparatus of a portable imaging-based measurement with self calibration (A method and apparatus of a portable imaging-based measurement with self calibration)" No. CN102549374A The scheme disclosed in the Chinese patent application No. uses the imaging method of changing the focal length to focus. Although the change of the outer diameter of the long material is considered, it is difficult to adjust and realize.

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