Depth sensing device and method

Abstract

A depth sensing device and method are provided. The device includes a light emitting component, a light receiving component, and a control unit. The light emitting assembly comprises a laser light source and a galvanometer, the laser light source comprises a single specific wavelength light source or a plurality of sub light sources, and the laser light source emits laser light towards the galvanometer so that the laser light can be projected to an object to be measured. The light receiving assembly is optically coupled with the light emitting assembly so as to receive reflected light of the laser light reflected from the object to be measured; the control unit is electrically connected with the light emitting assembly and the light receiving assembly, and controls the light emitting assembly and the light receiving assembly according to a structured light mode and / or a laser radar mode. The method includes performing the laser radar mode and / or the structured light mode. Therefore, the laser radar mode and / or the structured light mode can be selected according to the distance of the to-be-measured object to sense the depth of the to-be-measured object.

Description

technical field [0001] The present invention relates to sensing devices and methods, in particular to object depth sensing devices and methods. Background technique [0002] In applications such as face recognition, gesture recognition, object and environment modeling, etc., depth sensing devices are used to sense the position and depth information of objects and environments to obtain corresponding point cloud data, thereby establishing objects and environments 3D model of . [0003] The depth sensing technology used in this device can be divided into three types: Stereo vision (Stereo vision), Structured Light (Structured Light) and Time of Flight (TOF), each technology has its own advantages and disadvantages . For example, the advantage of stereo vision is that the hardware cost is low, but it is easy to be affected by ambient light and affect the depth accuracy of the measurement; the advantage of structured light is that it can obtain better depth accuracy, but it is...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned products need to include two different light-emitting components to generate structured light patterns and laser light for time-of-flight distance measurement respectively, so their volume and cost will increase

In addition, when the generated structured light pattern is a static speckle pattern, it is difficult to obtain better resolution due to the limitation that the speckle pattern element needs to be manufactured with a nanometer process technology that reaches the wavelength level of laser light; and the The generated laser light has a limited working distance due to energy divergence

Furthermore, this product usually uses a diffractive optical element (DOE) to generate a static structured light pattern, but if the process quality of the diffractive optical element is not good, it will easily affect the light uniformity of the structured light pattern, resulting in resolution bad

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