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Stray light compensation method and system for time of flight camera systems

A time-of-flight and stray light technology, applied in the field of stray light compensation, can solve problems such as unsolvable solution embedding

Active Publication Date: 2014-06-18
HEPTAGON MICRO OPTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in both of the above solutions, the computing power required does not allow the solution to be embedded in high speed data acquisition applications

Method used

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  • Stray light compensation method and system for time of flight camera systems
  • Stray light compensation method and system for time of flight camera systems
  • Stray light compensation method and system for time of flight camera systems

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Embodiment Construction

[0035] figure 1 It shows the reasons for the high demands on dynamic range and how adding strong stray light signals to weak signals can be a major problem in many applications.

[0036] The TOF camera 12 images the scene 10. The scene includes a highly reflective object 16 adjacent to the camera 12 and a low reflective object 14 far away from the camera 12. The problem is that the highly reflective object 16 can generate stray light. The distance to the low reflective object 14 , Range measurement is affected.

[0037] One mechanism by which stray light affects range measurements is non-ideal light paths in camera 12 .

[0038] figure 2 The non-ideal optical path of camera 12 is shown. The objective lens 20 images the light from the scene 10 onto the imaging chip 22 of the camera 12, and the light includes direct light 32 reflected from the object 16 and direct light 30 reflected from the object 14, between the objective lens 20 and the imaging chip 22 in the camera The ...

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Abstract

A method and system to compensate for stray light errors in time of flight (TOF) camera systems uses reference targets in the in the field of view (FOV) that can be used to measure stray light. In different embodiments, one or more reference targets are used.

Description

technical field [0001] The invention relates to a stray light compensation method and system for a time-of-flight camera system. Background technique [0002] Time-of-flight (TOF) 3D cameras are active systems. In general, the system is based on a homodyne phase measurement technique of emitted intensity-modulated light that is reflected by the scene, the reflected light is imaged on a sensor, and photogenerated electrons and emitted modulated light are synchronously demodulated in the sensor. , and infer the distance between the camera and the scene in each pixel based on the phase information. [0003] The main problem with TOF camera systems is that the described sensor has to deal with a high dynamic range, the modulated signal received by the camera degrades with the square of the distance, moreover, the reflectivity of the reference object can vary a lot, these factors are the factors that lead to high dynamic range s reason. [0004] As an example, an image may inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/497G01S17/89G01S17/36G01S17/894
CPCG01S17/89G01S17/36G01S7/497G01S17/894
Inventor T·欧吉尔
Owner HEPTAGON MICRO OPTICS