Browse Prior Art Database

Small Footprint Optical Targets

IP.com Disclosure Number: IPCOM000201308D
Publication Date: 2010-Nov-10
Document File: 5 page(s) / 218K

Publishing Venue

The IP.com Prior Art Database

Abstract

A small-footprint optical target, for use with a machine vision vehicle service system, consisting of a planar surface imprinted with an optical pattern which is partially visible to an observing camera focused at infinity utilizing the Bokeh Effect of an ordinary camera lens. The resulting image acquired by the camera’s optical sensor is a magnified view of a portion of the optical pattern imprinted on the optical target. The optical pattern is selected such that the visible portion provides identifying information to the observing camera system, including relative target range data and relative target spatial orientation data.

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Small Footprint Optical

Targets

November 1, 2010

ABSTRACT

  A small-footprint optical target, for use with a machine vision vehicle service system, consisting of a planar surface imprinted with an optical pattern which is partially visible to an observing camera focused at infinity utilizing the Bokeh Effect of an ordinary camera lens. The resulting image acquired by the camera's optical sensor is a magnified view of a portion of the optical pattern imprinted on the optical target. The optical pattern is selected such that the visible portion provides identifying information to the observing camera system, including relative target range data and relative target spatial orientation data.

DETAILED DESCRIPTION

  The present disclosure is directed generally towards machine vision vehicle service systems which utilize one or more cameras to acquire images of targets and objects within a field of view, from which measurements of spatial position and orientation can be determined by an associated processing system. These machine vision vehicle service systems are typically found in vehicle repair shops, and are not integrated into the vehicle undergoing service.

   The most common machine vision vehicle service systems include vehicle wheel alignment measurement systems and vehicle wheel mounting and balancing systems. Other machine vision vehicle service systems may include vehicle brake servicing systems and/or vehicle frame straightening / repair systems.

  Cameras utilized in machine vision vehicle service systems typically have adjustable focus settings, allowing for focusing on specific optical targets or vehicle components which may be disposed in different positions relative to the camera during each vehicle service procedure, and/or may be moved to different positions during a single vehicle service procedure.

  Cameras utilized in machine vision vehicle service systems can be designed to have a fixed focal length lens such that the lens' depth of field and location will keep in focus the specific optical targets or vehicle components which may be disposed in different positions relative to the camera during each vehicle service procedure, and/or may be moved to different positions during a single vehicle service procedure.

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  The present disclosure sets forth a machine vision vehicle service system having at least one large aperture camera with an adjustable or fixed focus lens set to infinity to capture out-of-focus images of a field of view, independent of distance, within which are disposed one or more specifically configured precision small-footprint optical targets associated with vehicle components or surfaces for which spatial position and orientation measurements are required. Each precision small-footprint optical target includes a pinhole opening or lens aperture spaced apart from, and overlaying, a planar surface imprinted with a selected optical pattern.

   By utilizing a camera lens bokeh effect, a small...