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Method and apparatus for detecting and mitigating optical impairments in an optical system

A machine vision system and coordinate system technology, applied in the field of optical systems, can solve problems such as reducing focus quality

Active Publication Date: 2017-02-15
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] While the focus quality profile of lens 6 will generally be such that the minimum focus quality of the lens is acceptable, at least under nominal operating conditions, haze, fogging, oil, dust, etc. on lens 6 and / or imager 8 will be reduced to within Focus quality and / or contrast as seen in images acquired by imager 8

Method used

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  • Method and apparatus for detecting and mitigating optical impairments in an optical system
  • Method and apparatus for detecting and mitigating optical impairments in an optical system
  • Method and apparatus for detecting and mitigating optical impairments in an optical system

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Embodiment Construction

[0023] Figure 4 is a block diagram of an apparatus 10 according to one embodiment. Apparatus 10 , hereinafter referred to as “machine vision system 10 ,” includes a control unit 12 and one or more sensor heads or SHs 14 . For convenience, only one sensor head 14 is shown. However, in one or more embodiments, control unit 12 may be communicatively coupled to two or more such sensor heads 14, such as sensor heads 14-1, 14-2, and so on.

[0024] Each sensor head 14 provides multi-view imaging capabilities, such as stereoscopic imaging capabilities. In the exemplary embodiment, sensor head 14 (which may also be referred to as a camera head or camera unit) includes first and second camera assemblies 16-1 and 16-2, which operate as a stereoscopic camera pair. Camera assemblies 16-1 and 16-2 are hereinafter referred to simply as cameras 16-1 and 16-2 or simply as "camera 16" unless a suffix is ​​required for clarity.

[0025] Each camera 16 includes a lens assembly 18 comprising...

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Abstract

According to one aspect of the teachings herein, a method and apparatus detect mechanical misalignments in a machine vision system during run-time operation of the machine vision system, and compensate image processing based on the detected misalignments, unless the detected misalignments are excessive. Excessive misalignments may be detected by determining a worst-case error based on them. If the worst-case error exceeds a defined limit, the machine vision system transitions to a fault state. The fault state may include disrupting operation of a hazardous machine or performing one or more other fault-state operations. Among the detected misalignments are internal misalignments within individual cameras used for imaging, and relative misalignments between cameras. The method and apparatus may further perform run-time verifications of focus and transition the machine vision system to a fault state responsive to detecting insufficient focal quality.

Description

technical field [0001] The present invention relates generally to optical systems such as may be included in machine vision systems or other optoelectronic systems, and in particular to detecting and mitigating mechanical misalignment in optical systems. Background technique [0002] Optical systems are widely used in various industries. Optoelectronic systems in particular provide valuable surveillance and object detection capabilities, including in safety-critical applications. As an example, a single- or multi-camera imaging system could be used to monitor or "protect" the area around an industrial robot, metal press, or other hazardous machine and provide emergency response in response to detection of human intrusion into the protected hazardous area. Stop signaling. [0003] Many machine vision systems use stereoscopic vision or multi-camera imaging, which involves two or more cameras with overlapping fields of view. By observing the same object or objects from diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N13/02G06T7/00H04N23/90H04N13/239
CPCH04N2013/0096G06T2207/10012G06T2207/30204G06T2207/30108H04N13/239G06T7/80G06T7/85H04N13/246H04N13/296
Inventor 庄司武J.德林卡德A.泰亚吉
Owner ORMON CORP