Distance Measurement Method of Time-of-Flight Depth Camera and Single-frequency Modulation and Demodulation

A technology of depth camera and distance measurement, applied in the field of optical measurement

Active Publication Date: 2021-07-06
SHENZHEN ORBBEC CO LTD
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  • Description
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Problems solved by technology

[0004] In order to solve the existing problems, the present invention provides a time-of-flight depth camera and a distance measurement method for single-frequency modulation and demodulation

Method used

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  • Distance Measurement Method of Time-of-Flight Depth Camera and Single-frequency Modulation and Demodulation
  • Distance Measurement Method of Time-of-Flight Depth Camera and Single-frequency Modulation and Demodulation
  • Distance Measurement Method of Time-of-Flight Depth Camera and Single-frequency Modulation and Demodulation

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Embodiment Construction

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be used for both fixing and circuit communication.

[0020] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", ...

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Abstract

The invention provides a time-of-flight depth camera and a distance measurement method for single-frequency modulation and demodulation. The time-of-flight depth camera includes a transmitting module, including a light source, for emitting pulsed beams to an object to be measured; an acquisition module, including at least one An image sensor composed of pixels, each pixel including at least 3 taps, the taps are used to collect the charge signal generated by the reflected pulse beam reflected by the object to be tested or the charge signal of the background light; the processing circuit is used to receive at least 3 taps The data of the charge signal of the tap; judge the data of the charge signal to determine whether the data of the charge signal includes the charge signal of the reflected pulse beam; calculate the flight time of the pulse beam and / or the distance of the object under test according to the judgment result. One frame of depth information can be obtained only by outputting three taps of signals in one exposure, thus significantly reducing the overall measurement power consumption and increasing the measurement frame rate.

Description

technical field [0001] The invention relates to the field of optical measurement, in particular to a time-of-flight depth camera and a distance measurement method for single-frequency modulation and demodulation. Background technique [0002] The full name of ToF is Time-of-Flight, that is, time of flight. The ToF ranging method is a technology that achieves precise ranging by measuring the round-trip flight time of light pulses between the transmitting / receiving device and the target object. In ToF technology, the technology of directly measuring the time of flight of light is called dToF (direct-TOF); the emitted optical signal is periodically modulated, and the phase delay of the reflected optical signal relative to the emitted optical signal is measured, and then by The measurement technology for calculating the time of flight by phase delay is called iToF (Indirect-TOF) technology. According to different modulation and demodulation methods, it can be divided into a con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/4865G01S17/26
CPCG01S7/4866G01S17/26
Inventor 胡小龙朱亮
Owner SHENZHEN ORBBEC CO LTD
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