A speed measurement method for hot-rolled coils combined with a line array camera

Abstract

The invention provides a hot-rolled coil speed measurement method combining a line-area array camera. The requirement for the frame collection rate of the area array camera can be lowered. The methodcomprises the following steps: determining a fixed acquisition line rate of the line-scan digital camera through speed measurement calibration; triggering the linear area-array camera to simultaneously acquire an image of a hot rolled coil to be subjected to speed measurement; comparing a single image acquired by an area-array camera with an image acquired by the linear-array camera by utilizing the characteristic that the linear-array camera can cause image deformation by using the same fixed acquisition linear rate at different movement speeds, and determining the actual movement speed of ahot rolled coil according to the deformation condition of a change area in the acquired image, wherein the linear area-array cameras comprise an area-array camera and a linear array camera, the lineararea-array cameras are located over the hot-rolled steel plate, and the linear area-array cameras are located at the same height and the same horizontal position. The invention relates to the technical field of machine vision application.

Description

technical field [0001] The invention relates to the technical field of machine vision applications, in particular to a speed measurement method for hot-rolled coils combined with a line-area array camera. Background technique [0002] In order to ensure accurate positioning of the defect, it is necessary to obtain the accurate speed of the hot-rolled coil at the detection position. At present, the speed received from the first or second level of the production line often cannot accurately correspond to the speed of the detection position, which will cause a certain deviation. An independent speed measurement device needs to be installed, and the cost of laser speed measurement is relatively high, while the common single-array image speed measurement method needs to collect multiple images, and judge the movement of objects through the changes in the overlapping areas. Hot-rolled strip steel moves fast, It reaches about 15m / s. In order to ensure that there are overlapping are...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for measuring the speed of hot-rolled coils with a combination of linear and area array cameras, so as to solve the problems existing in the prior art that an area array camera with a high acquisition frame rate is required and the acquisition frame rate is too high. It will cause the image quality to degrade and affect the speed measurement accuracy

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