Structured light technology-based projector calibration method

A calibration method and projector technology, applied in the field of optical measurement, can solve the problems of accuracy loss, complex calibration process, and increased cost, and achieve the effect of reducing specific requirements, simple operation, and reducing additional costs.

Active Publication Date: 2018-06-29
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The calibration process is relatively complicated, and the calibration through the camera will inevitably lead to increased costs, and the loss of accuracy due to coordinate transfer

Method used

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  • Structured light technology-based projector calibration method
  • Structured light technology-based projector calibration method
  • Structured light technology-based projector calibration method

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Embodiment Construction

[0041] The projector calibration method based on structured light technology proposed by the present invention includes the following steps:

[0042] (1) Connect the projector to be calibrated with the graphics processing module, data processing module and light intensity sensing module respectively, place the calibration object within the field of view of the projector, and place the light intensity sensing module at a positioning point of the calibration object on, such as figure 1 As shown, the calibration object refers to any object whose three-dimensional structure information is known, and there are several positioning points with known relative positional relationship on the object;

[0043] (2) Establish a coordinate system of the projector to be calibrated and a world coordinate system, such as figure 2 As shown, the coordinate system of the projector to be calibrated is a three-dimensional right-handed coordinate system. The three-dimensional right-handed coordinat...

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Abstract

The invention relates to a structured light technology-based projector calibration method and belongs to the technical field of light measurement. The projector calibration method comprises the stepsof sensing brightness change of a structured light image obtained through a projector by using a light intensity sensing module through utilizing a structured light technology; establishing a relationship between the brightness change and an image of a to-be-calibrated projector; building and solving mathematic models of projector coordinates and world coordinates; obtaining an internal parametermatrix Min and an external parameter matrix Mex of the to-be-calibrated projector; and realizing the calibration of the projector. According to the method, a calibration object of any known three-dimensional structure can be used for performing the projector calibration, so that the additional cost required for the projector calibration is effectively reduced; and the light intensity change of a locating point is only collected during each circulation in the calibration process, and image coordinates corresponding to the locating point are only calculated, so that the algorithm difficulty andcomplexity of calculating a whole projection structured light region in an existing calibration method are lowered, the operation is simple, and the working efficiency of the projector calibration isimproved.

Description

technical field [0001] The invention relates to a projector calibration method based on structured light technology, belonging to the technical field of light measurement. Background technique [0002] Projectors have important applications in structured light three-dimensional measurement, VR technology, etc., and the premise of these applications usually requires accurate calibration of internal and external parameters. Projectors and cameras have similar structures, and there are relatively mature algorithms for camera calibration. However, projectors cannot image like cameras. This is where the difficulty of projector calibration lies. How to use camera calibration algorithms to calibrate projectors is still a problem. research focus in related fields. [0003] At present, the calibration of projectors is mainly based on structured light technology and cameras. For example, the patent applied by Huazhong University of Science and Technology is called a method of calibra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 徐静侯志民王朋陈恳
Owner TSINGHUA UNIV
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