Absolute phase recovery method based on object lateral dimension assistance

A technology of lateral dimension and absolute phase, which is used in measurement devices, instruments, optical devices, etc. to achieve the effect of increasing speed

Pending Publication Date: 2021-10-15
苏州东方克洛托光电技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in view of the problems of the phase unwrapping algorithm above, there is still a lack of an effective method to obtain the absolute phase distribution

Method used

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  • Absolute phase recovery method based on object lateral dimension assistance
  • Absolute phase recovery method based on object lateral dimension assistance
  • Absolute phase recovery method based on object lateral dimension assistance

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Embodiment Construction

[0028] The present invention will be described in further detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, rather than to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0029] In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a One body; it can be mechanically or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary ...

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Abstract

The invention relates to an absolute phase recovery method based on object lateral dimension assistance. The method comprises the following steps of: simultaneously projecting three sinusoidal grating images of three-step phase shift to the surface of an object to be measured through a projector, and synchronously acquiring a reflection grating image modulated by the surface of the object through a camera; calculating a wrapped phase containing three-dimensional information of the object and an object texture intensity image; unwrapping the wrapped phase into continuous relative phase distribution; calculating a transverse dimension reference value of the object by utilizing the texture intensity information of the object; subtracting the transverse dimension reference value of the object under different n values from the transverse dimension estimation values of the object, obtaining an absolute value to obtain a difference value, and obtaining a correct value n0 of n; and converting the relative phase distribution into absolute phase distribution by using the correct value n0. The absolute phase distribution of the object can be recovered only by projecting three grating images, the speed of three-dimensional measurement is effectively improved, and the method is used for high-speed three-dimensional measurement.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional measurement of structured light, and in particular relates to an absolute phase recovery method based on the lateral dimension of an object to realize three-dimensional measurement of an object through a phase shift method. Background technique [0002] Structured light three-dimensional measurement technology has the advantages of fast measurement speed, high precision and non-contact, and has become a popular technology in the field of three-dimensional measurement in recent years. In structured light 3D measurement, phase recovery accuracy is one of the key factors to determine the accuracy of 3D measurement. [0003] Existing methods for extracting phase include phase shift algorithm, Fourier transform, wavelet transformation, etc., but the phases obtained by these methods are all wrapped phases of [-π, π]. Therefore, it is necessary to use the phase unwrapping algorithm to realize ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/25
Inventor 韩希珍曲锋孙金霞
Owner 苏州东方克洛托光电技术有限公司
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