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A Method for Realizing Projector and Video Camera Software Synchronization

A projector and camera technology, applied in the field of 3D scanning imaging, can solve the problem of difficult precise time synchronization between the projector and the camera, and achieve the effects of fast judgment, simple operation, and high imaging refresh rate

Active Publication Date: 2022-05-13
SHANGHAI NINTH PEOPLES HOSPITAL SHANGHAI JIAO TONG UNIV SCHOOL OF MEDICINE
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Problems solved by technology

[0004] The present invention innovatively proposes a method for synchronizing the projector and the camera only with a software algorithm. This method solves the problem of difficult time synchronization between the projector and the camera in the current structured light three-dimensional scanning technology, and enables the collected The pattern frequency is stable at, for example, 30Hz or 60Hz, so that ordinary projectors and cameras (without hardware trigger mechanism) can also be used to collect structured light patterns at high speed, which can greatly simplify the three-dimensional scanning device and reduce costs

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  • A Method for Realizing Projector and Video Camera Software Synchronization

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[0029] The following describes the preferred embodiments of the present application with reference to the accompanying drawings to make the technical content clearer and easier to understand. The present application can be embodied in many different forms of embodiments, and the protection scope of the present application is not limited to the embodiments mentioned herein.

[0030] The idea, specific structure and technical effects of the present invention will be further described below to fully understand the purpose, features and effects of the present invention, but the protection of the present invention is not limited thereto.

[0031] In one embodiment of the present invention, the synchronization method of projection and shooting is described as follows:

[0032] first step, such as figure 1 As shown in the projection (1) in , the projector projects the calibration image, that is, the pattern 1-3 in the figure. In the original continuous calibration image sequence, a ...

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Abstract

A method of synchronizing the projector and the camera through software, specifically inserting a pure black image in a complementary pattern and projecting continuously, and the frame frequency of the camera is half of the refresh rate of the projector, and the contrast between the projector and the camera can be judged by the contrast of the captured image Whether the camera is synchronized. The beneficial effects of this method are: it can solve the problem of difficult time synchronization between the projector and the camera in the current structured light three-dimensional scanning technology, so that the structured light pattern that can be collected at high speed by using ordinary projectors and cameras (without hardware trigger function), The three-dimensional scanning device can be greatly simplified and the cost can be reduced.

Description

technical field [0001] The invention belongs to the field of three-dimensional scanning imaging, in particular to a software synchronization method between a projector and a video camera. Background technique [0002] In the field of 3D imaging, projectors and cameras are usually used to construct a 3D scanning device based on structured light. The principle is to use a projection device (such as a DLP projector) to project structured light of different patterns to the measured object, and at the same time take a picture of the structured light image that is modulated and deformed by the surface of the measured object, and then use an algorithm to invert the three-dimensional surface of the measured object. Morphological information. Each frame projected by the projector needs to display a different texture. Due to the limitations of hardware equipment, the maximum frame rate of ordinary projectors is 60Hz or 120Hz. For this kind of scanning task with high real-time requir...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/31
CPCH04N9/3191H04N9/3182
Inventor 肖文郑远林沈晓伟汪俊
Owner SHANGHAI NINTH PEOPLES HOSPITAL SHANGHAI JIAO TONG UNIV SCHOOL OF MEDICINE
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