Out-of-focus digital fringe projection calibration device and method

A technology of fringe projection and calibration method, applied in the field of calibration, can solve the problems of limited measurement range, obvious error in height variation area, and not allowing large depth variation range of objects, so as to avoid manual errors, improve measurement accuracy, and improve errors. Effect

Pending Publication Date: 2020-09-11
浙江四点灵机器人股份有限公司
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AI Technical Summary

Problems solved by technology

[0004] (1) The calibration method based on the reference plane is not a high-precision calibration method, and the error is obvious in the area of ​​height change;
[0005] (2) The calibration method based on the reference plane does not allow the object to have a large depth range in principle derivation, and its relative measurement range is limited;

Method used

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  • Out-of-focus digital fringe projection calibration device and method
  • Out-of-focus digital fringe projection calibration device and method
  • Out-of-focus digital fringe projection calibration device and method

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Embodiment Construction

[0052] The technical scheme of the present invention will be further described below by specific examples:

[0053] The invention discloses a defocused digital fringe projection calibration device. figure 1 It is a structural schematic diagram of the out-of-focus digital fringe projection calibration device. Including the following:

[0054] Camera: used to obtain the deformed sinusoidal fringes;

[0055] Projector: used to project sinusoidal stripes on the object to be tested;

[0056] Dot calibration plate: used for camera and projector calibration.

[0057] The projector and the camera are respectively connected to the computer, and the projector and the camera are located in the area directly above the dot calibration board, which is a white circle and black background calibration board.

[0058] For the out-of-focus projection system, on the image captured by the camera, a point on the object is no longer a focused point, but a defocused circle, and a point on the pro...

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Abstract

The invention discloses an out-of-focus digital fringe projection calibration device and method. The method comprises the steps of calibrating camera parameters under a system defocusing condition; calibrating projector parameters under the condition that the system is out of focus; and obtaining a more accurate conversion relationship between the phase information and the spatial depth information of the to-be-measured object. The device disclosed by the invention is used for a method for carrying out structured light projection on an object. Absolute phase information of the position of theto-be-measured object is obtained; due to the fact that a commercial projector has a nonlinear effect, projection fringes approximate to standard sine are obtained in a defocusing mode, the key purpose of calibration is to better convert the absolute phase and the object height, the absolute phase is obtained through the device, calibration is also conducted in the device, the measurement precision is improved, and errors of the detection result of the height change area are reduced.

Description

technical field [0001] The invention relates to the field of calibration, in particular to a defocused digital fringe projection calibration device and method. Background technique [0002] The calibration method based on the reference plane is widely used in digital fringe projection technology because of its ease of use. The calibration method based on the reference plane can convert the unwrapped phase into the depth information in the z direction. In the early stage, the absolute phase information of the model to be tested can be obtained through the defocused structured light three-dimensional projection technology and the phase shift method, and then the reference plane method can be used to determine the relationship between the absolute phase and the spatial depth information. In actual operation, a standard cube with known parameters can be used for measurement to determine the corresponding relationship between phase and height. [0003] The main flaws are: [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 林斌孟森森
Owner 浙江四点灵机器人股份有限公司
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