Three-line structured light machine vision width measurement method for hot rolled sheet belts

Abstract

The invention relates to a three-line structured light machine vision width measurement method for hot rolled sheet belts, which comprises the following steps of 1) respectively placing a light source and a camera on two sides of a sheet; 2) acquiring four parallel planes of alpha 1L, alpha 2L, alpha 1R and alpha 2R between the two cameras to serve as calibration faces; 3) calculating the number m of pixels (containing end points) on a vertical section between a middle straight line of an image formed on each calibration face and the left margin of the image, calculating horizontal resolution ration rho, and respectively recording calculated values of the four calibration faces of alpha 1L, alpha 2L, alpha 1R and alpha 2R as rho 1L, rho 2L, rho 1R and rho 2R; 4) measuring distance between the calibration faces: the distance between the alpha 1L and alpha 2L is c L, the distance between the alpha 1R and the alpha 2R is c R, and the distance between the alpha 1L and the alpha 1R is L; 5) calculating the distance of s L and s R between the left side and the right side of the sheet and the corresponding calibration faces of alpha 1L and alpha 2R; 6) using the distance L between the calibration faces of alpha 1L and alpha 1R to reduce the sum of the distance between two lateral sides of the sheet and the two calibration faces to obtain the width of the sheet. Compared with the prior art, the three-line structured light machine vision width measurement method has the advantages of being simple, stable, reliable, low in cost, wide in application scope and the like.

Description

technical field [0001] The invention relates to a method for measuring the width of a hot-rolled strip, in particular to a method for measuring the width of a hot-rolled strip with three-line structured light machine vision. Background technique [0002] With the continuous innovation and progress of non-ferrous processing technology, width measurement plays an increasingly important role in width quality control and processing process control. [0003] In the past, the on-line width measurement of the strip during the hot-rolled strip rolling process was mainly concentrated in the iron and steel industry, while the hot-rolling unit in the non-ferrous industry has only been gradually adopted by domestic enterprises in recent years with the development of processing technology and automation level. attach importance to. [0004] There are two methods for online measurement of hot-rolled strip width in the traditional steel industry. One is the upper-mounted door beam structu...

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Problems solved by technology

[0005] The upper door beam structure is based on the infrared radiation measurement method, which is measured by sensing a large amount of infrared energy radiated by the measured object, and the infrared radiation of the non-ferrous processing hot-rolled strip is significantly different from that of steel processing. Moreover, the infrared measurement method is for The measurement accuracy of wide-width hot-rolled strips is low, and the high-precision infrared receiving sensor is a prohibited item. In addition, the most critical restrictive factor is that the application cost of this method is too high for the non-ferrous processing industry. Most enterprises unacceptable

[0006] The disadvantage of the double-sided laser measurement method is obvious. It can only measure the width of the horizontal position of the fixed height of the strip, which cannot reflect the distribution of the overall width of the strip from top to bottom, and there are vibrations and tilts in the actual processing of the strip. In other cases, this method cannot compensate accordingly, so it can only be used when the measurement requirements are very low

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