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A laser projector exposure time control method for a handheld laser three-dimensional scanner

A technology of exposure time and control method, applied in the field of handheld laser 3D scanning, can solve the problems of low scanning accuracy and poor scanning effect, and achieve the effect of high scanning accuracy, reducing requirements and improving adaptability

Active Publication Date: 2017-08-15
SCANTECH (HANGZHOU) CO LTD
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Problems solved by technology

[0005] In order to overcome the shortcomings of poor scanning effect and low scanning accuracy caused by the use of a laser projector with a fixed brightness in existing handheld laser three-dimensional scanners, the present invention provides a handheld laser three-dimensional scanner with good scanning effect and high scanning accuracy. Laser Projector Exposure Time Control Method for Instrument

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  • A laser projector exposure time control method for a handheld laser three-dimensional scanner
  • A laser projector exposure time control method for a handheld laser three-dimensional scanner
  • A laser projector exposure time control method for a handheld laser three-dimensional scanner

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] refer to Figure 1 ~ Figure 4 , a laser projector exposure time control method of a hand-held laser three-dimensional scanner, the control method comprises the following steps:

[0029] 4) Set the exposure time Ts of the laser projector in a camera sampling period as the initial value of the feedback control, and collect the image data of the camera;

[0030] 5) Filter and obtain the real laser line projection in the image collected by the camera;

[0031] 6) After obtaining the connected area of ​​the laser line projection, count the pixels in the connected area, compare the statistical results with the set reasonable exposure range of the laser, if it belongs to the reasonable exposure gray scale range, use Ts as the laser projector Exposure time, otherwise, adjust Ts.

[0032] Further, in step 3), the set of pixels obtained by searching for the pixels with...

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Abstract

A laser projector exposure time control method of a handheld laser three-dimensional scanner, comprising the steps of: 1) setting the exposure time Ts of the laser projector in a camera sampling period as the initial value of feedback control, and collecting image data of the camera ; 2) Screen the real laser line projection from the images collected by the camera; 3) After obtaining the connected area of ​​the laser line projection, count the pixels in the connected area, and compare the statistical results with the set reasonable exposure range of the laser , if it belongs to the reasonable exposure gray scale interval, take Ts as the exposure time of the laser projector, otherwise, adjust Ts. The invention provides a method for controlling the exposure time of a laser projector of a hand-held laser three-dimensional scanner with good scanning effect and high scanning precision.

Description

technical field [0001] The invention relates to a hand-held laser three-dimensional scanner, in particular to a hand-held laser three-dimensional scanning method. Background technique [0002] Handheld laser 3D scanning technology is gradually being used in various industries, archaeology, medical treatment, teaching and other fields due to its strong anti-interference ability, high detection accuracy, and easy use. Compared with the 3D scanner based on the principle of white light projection, the laser 3D scanner can extract the surface features of the object from each set of synchronous frame images to calculate a part of the surface point cloud of the scanned object, and because the laser projection has a greater light intensity, it allows capture The camera of its image can be exposed at a shutter time that does not produce motion blur, so it is more suitable for scanning in a state of continuous movement in a handheld manner. In addition, due to the singleness of the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03F7/20
Inventor 陈尚俭郑俊
Owner SCANTECH (HANGZHOU) CO LTD
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