Imaging method and device for visual inspection of surface quality of hot cylindrical long material

Abstract

The invention is an imaging method and device for visual inspection of the surface quality of a hot cylindrical long material. The imaging device includes a plurality of imaging units, a control system and a synchronous adjustment mechanism. Through the synchronous adjustment mechanism, the outer diameter of the cylindrical long material is controlled by the size of the outer diameter of the cylindrical long material. The system calculates the position parameters that the imaging unit needs to adjust, and the synchronous adjustment mechanism realizes the automatic adjustment of the imaging unit. The invention can detect the surface quality of different types of cylindrical long products for the same unit, and the visual inspection system can adjust the position of the imaging unit according to the outer diameter of the cylindrical long products, so that the distance between the image sensor and the surface of the cylindrical long products can be kept constant, so as to obtain Stable high-quality images, so as to achieve stable online inspection of the surface quality of hot cylindrical long products, timely detection of surface defects of cylindrical long products, reduce the occurrence of batch defects, and improve the yield.

Description

Technical field [0001] The invention relates to a machine vision inspection method and device, in particular to a visual inspection method and device for the surface quality of cylindrical long materials. Background technique [0002] Machine vision inspection technology is an important method widely used in product surface quality inspection in recent years. This technology obtains an image of the surface of the object to be inspected and analyzes and recognizes the image to evaluate the surface quality of the product. The acquisition of the surface image of the inspection object is a very important part of the visual inspection system, and it is also the key to whether the visual inspection system can successfully realize its function. Obtaining a clear image of the measured object depends on the stability of the various technical parameters of the key components and the measured object in the detection system. 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 name 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 adopts 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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