Vehicle-mounted laser radar temperature compensation system and method

Abstract

The invention discloses a vehicle-mounted laser radar temperature compensation system. The system collects distances measured by a laser radar at different test temperatures, constructs a distance andtemperature change curve relationship, generates a function relationship between compensation time and temperature, obtains the current temperature of the laser radar when the next frame of depth image of the laser radar is exposed, calculates the compensation time corresponding to the current temperature, increases the compensation time for a shutter signal of the laser radar, completes the timedomain compensation of the laser radar, corrects the brightness change of a grey-scale map caused by the change of the laser radar along with the temperature, collects the distances measured by the laser radar at all test temperatures on the basis of the time domain compensation, carries out cubic spline interpolation, generates a spline interpolation table of which the distance changes along with the temperature, and establishes a corresponding relation between the temperature and the compensation distance; the corresponding compensation distance is searched according to the current temperature of the laser radar, and the compensation distance is increased for the next frame of depth image, so that the linear region and the nonlinear region of an electronic device have high distance compensation precision.

Description

technical field [0001] The invention relates to the technical field of vehicle-mounted laser radar, in particular to a temperature compensation system and method for vehicle-mounted laser radar. Background technique [0002] As a representative of 3D vision equipment, lidar has been widely used in our lives, such as face payment, face unlocking, etc. In the field of vehicles, such as unmanned driving, literacy, face recognition, in-vehicle behavior recognition and other fields, lidar is also used more and more. LiDAR measures the distance by detecting the gray scale relationship between two adjacent groups of laser signals reflected back. The laser signal of the lidar and the shutter signal of the lidar are sensitive to temperature. As the temperature changes, the phase of the two will also change, resulting in ranging deviation. [0003] In the prior art, feedback adjustment is generally performed by increasing the temperature compensation coefficient. This solution is si...

AI Technical Summary

Problems solved by technology

However, in the vehicle field, its operating temperature range is large, and most electronic components will enter the nonlinear region, which will lead to a sharp decline in ranging accuracy.

In addition, due to temperature changes, the positions of the laser signal and the shutter signal in the time domain also change, which will also cause drastic changes in the grayscale value of the grayscale image output by the lidar, which will be too dark or overexposed, which will affect the facial recognition payment. Or the recognition accuracy of unlocking the scene by swiping the face

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