On-line visual inspection method for surface quality of plate with variable thickness

A technology of surface quality and visual inspection, which is applied in the direction of measuring devices, optical devices, and optical testing of flaws/defects, etc., can solve the problem of not considering the adjustment of the imaging scheme of the hot slab, and achieve the effect of ensuring physical resolution

Active Publication Date: 2017-10-31
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

The above related technologies are still in the stage of experimental verification, and the adjustment of the imaging scheme when the thickness of the hot slab changes is not considered

Method used

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  • On-line visual inspection method for surface quality of plate with variable thickness
  • On-line visual inspection method for surface quality of plate with variable thickness

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] see figure 1 and figure 2 , an online visual inspection method for the surface quality of plates with variable thickness. For the imaging of the surface of high-temperature slabs with different thicknesses, the imaging distance is kept consistent by automatically adjusting the position of the camera, and when the position of the light source is fixed, the current of the light source is maintained. The illuminance at the imaging position of the slab is consistent, so that when imaging slabs of different thicknesses, an image with consistent grayscale is output; the steps are:

[0022] First, the light source 1 and the camera 5 are located above the slab 6, and the position of the light source 1 is fixed; the projection angle of the light source is , the imaging angle of the camera is , the projection distance of the light source is ...

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Abstract

The invention relates to the technical field of machine vision and discloses a surface quality on-line visual inspection method for variable-thickness plates. For surface imaging of a high-temperature slab with different thicknesses, imaging distances are maintained the same by automatically adjusting the position of a camera, and illuminance at slab imaging positions is the same by adjusting light source drive current under the circumstance that the position of a light source is fixed, thus outputting images with the same gray scale during imaging of the slab with different thicknesses. The camera adopts a filter during imaging of a hot-state slab so as to filter red light of high-temperature radiation and near-infrared light. The method can obtain inspection object images with the same gray scale according to different thicknesses of the high-temperature slab and by adjusting the position of the camera and the light source drive current.

Description

technical field [0001] The invention relates to the technical field of machine vision, in particular to an online visual inspection method for surface quality of plates with variable thickness. Background technique [0002] The detection of surface defects of variable-thickness plates is difficult to realize due to the influence of various harsh conditions such as high-temperature radiation, noise, dust, water vapor, and oil pollution on site. At present, the method of manual visual inspection is often used for surface quality inspection of hot plates, that is, quality inspection points are set at the cooling bed to check the surface quality of large plates after rolling. Due to the high temperature of the steel plate after rolling, it is difficult to quickly complete the surface quality inspection of the steel plate in a short time, which is likely to cause batch defects, and this inspection method has many problems such as low defect detection rate and high labor intensity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88G01B11/00
Inventor 何永辉彭铁根刘斌赖万晓宗德祥杨水山石桂芬梁爽
Owner BAOSHAN IRON & STEEL CO LTD
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