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Resolving multi-path corruption of time-of-flight depth images

A multi-path, image processing technology, applied in damage-related systems and technical fields, can solve problems such as multi-path damage

Pending Publication Date: 2020-08-11
ANALOG DEVICES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nearby highly reflective surfaces such as mirrors can cause strong multipath damage

Method used

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  • Resolving multi-path corruption of time-of-flight depth images
  • Resolving multi-path corruption of time-of-flight depth images
  • Resolving multi-path corruption of time-of-flight depth images

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Embodiment Construction

[0036] Time-of-flight (ToF) depth imager arrays create an image of distance (i.e., depth) to objects in a scene by emitting light close to the imager and measuring the time it takes for the light to reflect off the object and return to the imager. The imager contains an array of light-receiving pixels, each of which converts the number of photons that reach a pixel when it is turned on, into a number that is stored in one of multiple memory cells in each pixel. Once the time t required for light to leave the source and return to the pixel in the imager is estimated R , then the depth to the part of the scene seen by the pixel is given by equation (1):

[0037]

[0038] where c is the speed of light.

[0039]One of the challenges in building a reliable ToF system is that light rays reaching a pixel may have traveled different distances. This is called multipath effect. Specifically, referring to equation (1), by setting the time t R Divide by half to determine the distan...

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Abstract

The invention relates to resolving multi-path corruption of time-of-flight depth images. Time of Flight (ToF) depth image processing methods are disclosed for resolving corruption of ToF depth images.In ToF depth imaging, the light can travel paths of different lengths before returning to the pixel. Thus, the light hitting the pixel can have travelled different distances, and the distance obtained from an estimation procedure assuming a single distance may be spurious. Systems and methods are disclosed for including a time-of-flight imager and processor which resolves the multiple paths, andoutputs the multiple depths at each pixel.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of and priority to U.S. Provisional Patent Application No. 62 / 800,968, entitled "Resolving Multipath Corruption of Time-of-Flight Images," filed February 4, 2019, which is incorporated herein by reference in its entirety. technical field [0003] The present disclosure relates to time-of-flight (ToF) imaging. More specifically, this disclosure describes systems and techniques related to addressing corruption of ToF depth images. Background technique [0004] Time-of-flight (ToF) is a property of objects, particles or sound, electromagnetic or other waves. Now is the time when such objects need to travel a certain distance through the medium. Measurements of this time (i.e., time-of-flight) can be used in time standards (such as atomic fountains), methods of measuring velocity or path length through a given medium, or methods of understanding particles or media (such as composition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/894G01S17/08G01S7/40
CPCG01S17/89G01S17/08G01S7/40H04N13/271H04N13/254G01S17/894G01S7/497G06T2207/10028H04N13/207G06T7/50
Inventor C·麦瑟
Owner ANALOG DEVICES INC
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