Secondary-projection-algorithm-based on-line non-contact contour detection system and method of intermediate-thick plate

Abstract

The invention discloses a secondary-projection-algorithm-based on-line non-contact contour detection system and method of an intermediate-thick plate. In the system, an area array CMOS (Complementary Metal-Oxide-Semiconductor) camera is used for acquiring an image of linear laser entering a band steel surface of the intermediate-thick plate; the shot image is processed by utilizing the secondary projection algorithm to precisely extract the longitudinal position coordinate of a laser line and the end point position coordinate of the laser line from the image; height information of the surface of the intermediate-thick plate can be calculated through the longitudinal position coordinate of the laser line; the space position coordinate of the edge of a band steel to be detected can be determined according to the height information of the surface of the intermediate-thick plate and the end point position coordinate of the laser line by virtue of vision calibration of the camera; a contour curve of the band steel of the intermediate-thick plate can be obtained after the speed data of the band steel, which is measured by a laser Doppler velocimetry, is processed by a computer. Through adoption of the system and method disclosed by the invention, on-line non-contact type high-speed detection of the contours of two sides of the band steel of the intermediate-thick plate is realized and on-line non-contact type high-speed detection of the contours of the head and the tail of the band steel of the intermediate-thick plate is realized.

Description

technical field [0001] The invention relates to an online non-contact medium-thick plate profile detection system and method based on a secondary projection algorithm. Background technique [0002] At present, the iron and steel industry has higher and higher requirements for the efficiency and detection accuracy of the strip rolling production line, especially for the automatic production line of medium and thick plates. This has brought great difficulties, which requires the contour detection system not only to have a high-speed image acquisition frequency, but also to have an efficient image processing algorithm to extract effective information in the image. [0003] As a special steel grade in the iron and steel industry, medium and thick plates are susceptible to interference from external uncertain factors due to the variability of their surface materials and textures and the variability of production line conditions. error. Therefore, in order to further improve the...

AI Technical Summary

Problems solved by technology

[0004] Due to the great uncertainty in the contour shape of the head and tail of the rolled plate, the traditional detection principle cannot accurately obtain the contour information of this part, or even detect it.

Furthermore, the existing profile detector based on CCD image sensor cannot complete the detection of the strip profile independently, because it cannot measure the height information of the strip surface relative to the roller table plane, but relies on the upper level system or other High detection equipment, which severely limits the scope of application of the profile detector

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