Method for correcting nonlinear distance error of 3-dimensional distance measuring camera by using pulse phase shift

Abstract

The present invention relates to a method for correcting the nonlinear distance error a 3-dimensional distance measuring camera by using a pulse phase shift. The present invention comprises the steps in which: a control unit adjusts the phase of an output light pulse outputted by a light-emitting unit; the light-emitting unit outputs, to a subject, the phase-adjusted output light pulse; a light-receiving unit receives a reflected-light pulse reflected from subject; and the control unit maps the adjusted phase of the output light pulse so as to correspond to an estimated actual distance, calculates a measured distance by using the time difference between a time point of the output of the output light pulse and a time point of the reception of the reflected-light pulse, and calculates and stores a distance error correction value for correcting the difference between the estimated actual distance and the measured distance. According to the present invention, space constraints generated while correcting a nonlinear distance error of a 3-dimensional distance measuring camera can be overcome, equipment costs required for distance error correction can be reduced, and a distance error correction time can be shortened.

Description

technical field [0001] The invention relates to a nonlinear distance error correction method of a three-dimensional distance measuring camera using pulse phase shift. More specifically, the present invention relates to a method of performing nonlinear distance error correction of a three-dimensional distance measuring camera at a fixed position by means of pulse phase shifting, thereby being able to overcome the It is a technology to reduce the cost of equipment required for distance error correction and shorten the time for distance error correction due to space constraints. Background technique [0002] In general, three-dimensional distance measuring cameras such as TOF (Time Of Flight: Time of Flight) cameras are known. [0003] figure 1 It is a diagram showing the distance measurement principle of the conventional TOF camera, figure 2 It is a graph showing the phase delay due to the distance in conventional TOF camera distance measurement. [0004] if refer to fig...

AI Technical Summary

Problems solved by technology

[0008] However, according to this conventional technique, as the measurement distance of the three-dimensional distance measurement camera increases, a wider space is required for measurement, and there is a problem that high costs are incurred for installing the platform.

In addition, there is a problem that error correction of the camera consumes a lot of time due to the time it takes for the operator to move the camera to a plurality of measurement points on the platform in order to measure the error.

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