An image processing method for ranging

Abstract

The present application provides an image processing method for ranging, which is used to obtain the thickness of a measured object based on a ranging image, where the measured object is made of a transparent material, including: using a laser sensor to emit laser light to the measured object light beam; obtain the pixel positions and corresponding voltage values ​​of the two light spots of the light beam reflected by the measured object, and separate the voltage values ​​of the two light spots based on the first set voltage threshold to form two voltage value sets; obtain based on the gray-scale centroid algorithm The centroid of the pixel position set corresponding to the two voltage value sets, according to the principle of centroid and triangular ranging, the distances L1 and L2 between the laser emitter and the front and rear surfaces of the measured object are obtained; based on L 1 and L 2 Get the thickness of the measured object. The present application makes full use of multiple reflections to obtain the thickness of the object to be measured, which can reduce the cost of thickness measurement.

Description

technical field [0001] The present application relates to the technical field of optical measurement, and in particular, to an image processing method for ranging. Background technique [0002] In real life, the thickness of many products needs to be measured to ensure the quality of the products. At present, the commonly used thickness measurement method is to measure the thickness of the measured object according to the spectral confocal method. This thickness measurement method uses a laser transmitter to send a laser beam to the measured object, and then divides the laser beam into multiple laser beams through a dispersive lens. On the upper surface of the object to be measured, the distance between the object to be measured and the laser transmitter must satisfy the convergence point of the laser beam of this wavelength on the object to be measured, and the laser beam of this wavelength will be reflected back, according to the reflected laser beam The thickness of the ...

AI Technical Summary

Problems solved by technology

At present, the commonly used thickness measurement method is to measure the thickness of the measured object according to the spectral confocal method. On the upper surface of the object to be measured, the distance between the object to be measured and the laser emitter must meet the converging point of the laser beam of this wavelength on the object to be measured, and the laser beam of this wavelength will be reflected back. According to the reflected laser beam The wavelength of the measured object can be obtained by using the spectral confocal method to obtain the thickness of the measured object with high precision, but the cost of obtaining the thickness of the measured object by this method is relatively high, and the convergence point of multiple laser beams with different wavelengths They are all on the measured object, and the measuring range is short, so it is not suitable for measuring the measured object with long distance and large thickness.

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