Direct time-of-flight 3D imaging method and device based on speckle projection

Abstract

The invention discloses a direct time-of-flight 3D imaging device based on speckle projection, and the device comprises a speckle projection module which is used for emitting a plurality of light beams and forming speckles which are distributed at intervals on a target surface; an SPAD array receiving module which is used for receiving speckle reflection light beams of a target surface and recording a light receiving moment; and a control processing module which is used for controlling the speckle projection module to emit the light beam, recording the light emitting moment, and processing and generating depth distance information according to the light flight time obtained by the light emitting moment and the light receiving moment. The invention also discloses a direct time-of-flight 3D imaging method based on speckle projection. According to the invention, time recording of two moments of light emission and light reception can be directly realized; and the device has the characteristics of far imaging distance, high signal-to-noise ratio, strong interference resistance, high precision and low power consumption.

Description

technical field [0001] The invention relates to the technical field of photoelectric imaging, in particular to a direct time-of-flight 3D imaging method and device based on speckle projection. Background technique [0002] The 3D imaging device can greatly enrich user experience and enhance product competitiveness. Different from traditional 2D imaging devices, such as cameras, which can only obtain plane 2D information of objects, 3D imaging devices can also obtain depth information of objects and build a three-dimensional 3D model, so 3D imaging devices are widely used in industrial measurement, parts Modeling, medical diagnosis, security monitoring, machine vision, biometrics, augmented reality AR, virtual reality VR and other fields have great application value. [0003] 3D imaging technology is divided into two types: active and passive. The active type uses structured light and time-of-flight technology as the mainstream, and the passive type uses binocular vision as ...

AI Technical Summary

Problems solved by technology

This technical solution indirectly obtains the time of flight of light by measuring the phase, and the phase measurement is actually further indirectly realized by relying on the energy intensity of the received light, which will cause the problem of inaccurate phase measurement and is susceptible to ambient light interference , once the distance continues to rise, such as more than 10m, the reflected and received light will be attenuated sharply, or even submerged by ambient light, and the measurement accuracy will drop sharply

At the same time, I-TOF technology essentially uses the average integration method of light energy to obtain the distance value of each pixel on the sensor, so multi-path interference problems will inevitably occur, resulting in unclear outlines of objects, distortion of angular shapes, and inability to distinguish phases. Two adjacent objects etc. problem

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