TOF depth camera distance calibration method and device

Abstract

The invention discloses a TOF depth camera distance calibration method and device. The method comprises the steps: S1, delaying a modulation clock signal of a TOF camera by a delay circuit, and driving a light source to emit an optical signal by using the delayed modulation clock signal; S2, reflecting the emitted optical signal to a plurality of pixels on the TOF camera sensor through a to-be-calibrated target; S3, building a distance error calibration table for a plurality of different delay amounts according to the theoretical distance and the actual distance between each pixel point and the to-be-calibrated target; S4, performing the distance compensation for each pixel by using the distance error calibration table in the actual measurement. The above technical solution of the presentinvention can solve the problem of the difference between pixel points, so that each pixel point maintains consistency within the measurement range of the TOF depth camera, and can effectively improvethe accuracy of the TOF depth camera for spatial target measurement.

Description

technical field [0001] The present invention relates to the technical field of TOF depth cameras, in particular to a method and device for distance calibration of TOF depth cameras. Background technique [0002] With the development of optical measurement, depth cameras based on TOF (Time of Flight) technology have gradually matured and have been applied in fields such as three-dimensional measurement, gesture control, robot navigation, security and monitoring. The basic principle of TOF technology is that the modulated light emitted by the active light source is reflected by the space object and then received by the sensor. By calculating the time difference between light emission and reflection, the distance between the TOF depth camera and the space object is finally obtained. Since the speed of light is 300,000km / s, the measurement of the entire flight time is very short, and the centimeter-level distance resolution requires the system to have a time measurement accuracy...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of the calibration device and the complicated calibration process in the TOF depth camera distance calibration method in the related art, the present invention proposes a TOF depth camera distance calibration method and device, which can solve the problem of differences between pixels and make each The pixel points are consistent within the measurement range of the TOF depth camera, which can effectively improve the accuracy of the TOF depth camera for space target measurement

Images