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Imaging method and apparatus using circularly polarized light

A circular polarization and elliptical polarization technology, which is used in the field of obtaining three-dimensional images of objects, and can solve the problems of polarization blindness and inability to distinguish different polarization directions.

Pending Publication Date: 2020-08-21
THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Our eyes can distinguish colors from objects, but not different directions of polarization
Photographers often use polarizers in front of their cameras to reduce glare and improve contrast, but modern digital cameras are polarization blind

Method used

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  • Imaging method and apparatus using circularly polarized light
  • Imaging method and apparatus using circularly polarized light
  • Imaging method and apparatus using circularly polarized light

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Embodiment Construction

[0022] The systems and techniques described herein are based in part on DOCP and S 3 Observations with a value close to zero.

[0023] For many 3D imaging applications, the object of interest is illuminated by an unpolarized active light source. Examples include light detection and ranging (LIDAR), imaging through structured illumination, and flash photography. One of the key problems in these measurement techniques is the difficulty in distinguishing the light originating from the illumination source (signal) from the background light (noise). Accurate measurements require a high signal-to-noise ratio (SNR) and good separation of background light.

[0024] exist figure 1 A 3D camera 100 is shown in . The system includes a camera 101, a structured illuminator 102, and a computer controller 103 connected to the illuminator and camera via wired or wireless connections. Structured light technology is commonly used in computer vision and optical metrology. Structured light s...

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PUM

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Abstract

A three-dimensional imaging system includes at least one light source, a circular or elliptical polarization beamsplitter, a detector arrangement and an image processor. The light source is configuredto provide light in a first circular or elliptical polarization state onto an object to be imaged. The circular or elliptical polarization beamsplitter is arranged to spatially separate the light reflected from an object into a first reflected portion in the first polarization state and a second reflected portion in the second polarization state. The first and second circular or elliptical polarization states are orthogonal to one another. The detector arrangement detects at least the first reflected portion of the light and the image processor is configured to generate image information fromthe detected first reflected portion.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application Serial No. 62 / 583,301, filed November 8, 2017, the contents of which are incorporated herein by reference. Background technique [0003] This document discloses a method and apparatus for measuring three-dimensional (3D) images using circularly polarized light. The invention has applications in technologies such as remote sensing, surveillance, 3D scanning / imaging, industrial inspection, metrology, medical imaging, biometric authentication, object tracking, virtual reality, augmented reality, and autonomous vehicles. [0004] Polarization is a property of light in which light rays have different amplitudes in different directions. Our eyes can distinguish colors from objects, but not different directions of polarization. Photographers often use polarizers in front of their cameras to reduce glare and improve contrast, but modern digital cameras are polariza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/28G02B5/30G01S7/499G01S17/89G01S17/42G02B30/25
CPCG02B5/3016G02B27/283G02B27/286G01S17/42G01S17/89G01S7/499H04N23/56H04N13/229G02B5/3083H04N23/55
Inventor 斯坦利·K·H·保
Owner THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA