TOF sensing device and distance detection method thereof

Abstract

The invention discloses a TOF sensing device and a distance detection method thereof, and the method comprises the steps: transmitting pulse detection light to irradiate a detected view field, and thepulse detection light at least comprising two types of pulses with different pulse widths; receiving the reflected pulse detection light, and obtaining initial distance information of each position in the detected view field according to the time interval of the pulse of the pulse detection light from emission to reception; and combining the initial distance information obtained according to thepulses with different pulse widths to obtain the measured distance information of each position in the measured field of view. According to the TOF sensing device and the distance measuring method thereof, the influence of multi-path reflected light can be reduced, and the distance detection accuracy is improved.

Description

technical field [0001] The present application relates to the field of sensing technology, in particular to a TOF sensing device and a distance detection method thereof. Background technique [0002] Time of Flight (ToF, Time of Flight) sensors measure the distance, three-dimensional structure or three-dimensional profile of the measured object by detecting the time interval from the emission to the reception of the pulse signal or the phase generated by the laser going back and forth to the measured object once. . TOF sensors can simultaneously obtain grayscale images and distance images, and are widely used in many fields such as somatosensory control, behavior analysis, monitoring, automatic driving, artificial intelligence, machine vision, and automatic 3D modeling. [0003] In the actual distance detection process, due to the complex environment in the measured field of view, there are usually multiple reflective surfaces, resulting in multi-path reflection problems, i...

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Problems solved by technology

[0003] In the actual distance detection process, due to the complex environment in the measured field of view, there are usually multiple reflective surfaces, resulting in multi-path reflection problems, including: the detection light may reach the surface of the measured object after multiple reflections after being emitted, The reflected light reflected by the measured object may also be received by the time-of-flight sensor after multiple reflections.

The problem of multi-path reflection will cause the distance traveled by the detection light to be reflected and received to be greater than twice the actual distance of the measured object, thus affecting the accuracy of distance detection

[0004] In the prior art, for the above-mentioned multi-path interference (MPI, Multi-path interference) problem, complex algorithm correction is usually used to reduce the influence of multi-path reflected light on the detection result, which requires high computing power of the sensor. cause cost increase

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