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A scanner and surface reflection technology, applied in the field of non-contact optical scanning, can solve the problem that other pixels cannot detect weak reflections, etc., and achieve the effects of improving beam profile, reducing speckle, and reducing motion blur

Active Publication Date: 2011-09-28
3SHAPE AS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Some pixels in the image may be saturated, while others may not be able to detect weak reflections

Method used

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Embodiment Construction

[0055] Many scanner systems basically work in the same way, see figure 1 : A monochromatic or multispectral light pattern 101 (for example, laser dots, laser lines, white or color stripes) is projected from the light source 102 onto the object 103. The projected light is then reflected 104 and one or more cameras 105 capture the projected image.

[0056] For a preferred embodiment of the present invention, the light source 102 must be a light source whose intensity can be adjusted at a high frequency. In this context, “high” means at least 100 times the frame rate of the camera 105. Lasers whose input power can be modulated usually meet this requirement. In the following description of various embodiments of the scanner according to the present invention, it is therefore assumed that 102 is a laser light source.

[0057] In a 3D scanner, the above-mentioned light pattern is detected in the image and perfect projective geometry such as triangulation or stereometry can be used to d...

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Abstract

The present invention relates to non-contact optical scanning of an object for generation of a three-dimensional surface model of the scanned object. In particular the invention relates to a scanner for obtaining the three-dimensional geometry of at least a part of the surface of an object, said scanner comprising: - at least one light source, preferably a laser light source with adjustable power, - projection means for directing light from the at least one light source to a moving spot on the surface of the object, - at least one image sensor adapted to record at least one image of at least a part of the surface, - detection means, other than the at least one image sensor, for monitoring at least a part of the light reflected from the surface, - regulation means for adjusting the intensity of the at least one light source based on the amount of light reflected from the surface, and - means for transforming the at least one image to a three-dimensional model of the surface.

Description

[0001] The invention relates to non-contact optical scanning of objects for generating a three-dimensional surface model of the scanned object. Background technique [0002] Laser scanners are widely used in many applications, for physically changing the scanned object (fine engraving, welding) or for detecting surface properties (barcode reading, digital three-dimensional surface reconstruction). The basic principle of the laser scanner is to guide the beam to the scanned object. By using optical elements such as lenses or mirrors, light beams can be guided in a certain spatial pattern (for example, lines). [0003] One method for generating a digital three-dimensional model of a physical object is to direct a laser beam onto the surface of the object and use a camera to record images from different angles. When the relative position and internal parameters of the beam generator and camera are known, triangulation can be used to calculate the three-dimensional shape of the illumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01N21/88
CPCG01B11/2518
Inventor 卡尔-约瑟夫·霍伦贝克亨里克·奥杰伦德克里斯多夫·西蒙·爱德华兹阿尔弗雷多·查韦斯·普拉萨歇尔R·费斯克
Owner 3SHAPE AS