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A surface structured light system sub-pixel precision decoding method based on gray moment

A technology of surface structured light and decoding method, which is applied in the directions of image enhancement, image analysis, image data processing, etc., can solve the problems of uneconomical, high-precision measurement hardware investment cost, etc., and achieve simple decoding algorithm, reduce Cost, the effect of improving measurement accuracy

Inactive Publication Date: 2019-04-26
ZHEJIANG UNIV
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Problems solved by technology

In this way, the hardware investment cost for high-precision measurement is huge, which is not economical

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  • A surface structured light system sub-pixel precision decoding method based on gray moment
  • A surface structured light system sub-pixel precision decoding method based on gray moment
  • A surface structured light system sub-pixel precision decoding method based on gray moment

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Embodiment Construction

[0060]The purpose and effects of the present invention will become clearer by describing the present invention in detail according to the accompanying drawings and preferred embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0061] A sub-pixel precision decoding method for a surface structured light system based on gray moments proposed by the present invention includes the following steps:

[0062] (1) Use the binary Gray code fringe coding method to design the surface structured light projection pattern, obtain a sequence of projection patterns, and project these patterns onto the surface of the measured object in turn. Due to the influence of the shape of the object, the projection pattern irradiated on the object will be Deformation occurs, and a coded image can be obtained by photographing with a camera.

[0063] (2) The coded image is used as the target i...

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Abstract

The invention discloses a surface structured light system sub-pixel precision decoding method based on gray moment. Firstly, a projection pattern of a surface structured light system is designed by adopting a stripe coding method; projecting the projection pattern to the surface of the measured object; The method comprises the steps of obtaining an image coded by an object through shooting by a camera, then carrying out Canny operator edge detection on the coded image to obtain a pixel-level edge of the coded image, and finally extracting the sub-pixel edge by adopting a gray moment method forpixel-level edge points, thereby decoding to obtain a sub-pixel precision result. The method breaks through the limitation caused by the physical precision of the projector and the camera, the measurement precision of the structured light measurement system is improved through a software method, the hardware cost of high-precision measurement is greatly reduced, and the method can be applied to ahigh-precision three-dimensional measurement scene.

Description

technical field [0001] The invention relates to the field of three-dimensional object measurement, in particular to a gray moment-based sub-pixel precision decoding method for a surface structured light system. Background technique [0002] Surface structured light three-dimensional measurement technology is an active projection measurement technology. It uses a projector to project a structured light pattern with encoded information to the measured object, and uses a camera to capture the structured light image that is affected by the measured object. Use this image to calculate the three-dimensional measurement information of the actual measured object. Surface structured light 3D measurement technology has the characteristics of high measurement accuracy, strong anti-interference ability, and complete collection of 3D information, and has strong development prospects and application value. [0003] Surface structured light measurement technology is suitable for scenes th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13G06T7/62G06T7/66G01B11/25
CPCG01B11/25G06T7/13G06T7/62G06T7/66G06T2207/20068
Inventor 刘山李栋
Owner ZHEJIANG UNIV
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