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Reference image-based structured light system phase demodulation method and system

A technology of structured light system and reference image, which is applied in the field of phase resolution of structured light system based on reference image, can solve complex problems, achieve the effect of reducing working condition requirements and improving scanning efficiency

Active Publication Date: 2018-10-02
深度创新科技(深圳)有限公司
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Problems solved by technology

[0005] The traditional method is to re-project multiple gray-coded binary fringe images to calculate the number of cycles, which is relatively complicated, so it is necessary to improve this technology

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  • Reference image-based structured light system phase demodulation method and system
  • Reference image-based structured light system phase demodulation method and system
  • Reference image-based structured light system phase demodulation method and system

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Embodiment Construction

[0047] It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other if there is no conflict.

[0048] The present invention discloses a new and practical phase resolution method, which only needs to project 4 images to a target scene, including 3 phase shift fringe patterns and 1 reference texture image. Before modeling, first use a structured light system to shoot a flat target (such as a wall). In the captured image of the plane target, the fringe image is used to calculate the number of cycles corresponding to each pixel of the reference texture image. When modeling, as long as the corresponding relationship between the current texture map and the texture map of the preparation process is established, the pixels of the current view can be directly mapped to the cycle number, and then combined with the relative phase value obtained by the phase shift method to obtain the absolute phase value.

[0049] 1. Basic p...

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Abstract

The invention discloses a reference image-based structured light system phase demodulation method. The method comprises the following steps: in preparation, the system controls the structured light system to project and shoot a plane scene, two images which are a black and white binary fringe image and a texture image are projected on a target plane, corresponding two images are acquired, the fringe image is analyzed, and a periodic number corresponding to each pixel point in the texture image is obtained; and in a modeling process, the system controls the structured light system to project and shoot a plane scene, four images which are three phase shift fringe images and a texture image are projected on the target plane, the corresponding relationship between the texture image acquired currently and the texture image acquired in the preparation process is built, a periodic number corresponding to each pixel point in the current view is acquired, the relative phase of each pixel is obtained through the phase shift method for the three images, and in combination of the periodic number, the relative phase of each pixel in the current view is obtained.

Description

Technical field [0001] The invention relates to the field of three-dimensional surface scanning modeling, in particular to a structured light system dephase method and system based on a reference image. Background technique [0002] Three-dimensional surface scanning modeling has a wide range of applications in product inspection, reverse engineering, 3D printing, human body measurement, human-computer interaction, animation production and other fields. Currently popular methods include laser scanning method, stereo vision method, time of flight (ToF) method and structured light method. [0003] The phase shift method is well known for its high accuracy. The phase-shift structured light system can generally be divided into a single projection-single camera system and a single projection-dual camera system. [0004] The classic phase shift method requires at least 3 phase-shifted fringe patterns to be projected to the target surface, and the phase value at each pixel point of the ca...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 朱宪伟徐玉华周阳
Owner 深度创新科技(深圳)有限公司
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