Method for generating light field with sine structure by means of space-time binary encoding

A binary coding and structured light technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of poor coding flexibility and limited application range, and achieve a wide range of applications, high sine, high-speed and high-precision three-dimensional surface The effect of shape measurement

Active Publication Date: 2015-04-29
SICHUAN UNIV
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Problems solved by technology

[0005] The present invention aims at the deficiencies of existing structured light coding: limited scope of application and poor

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  • Method for generating light field with sine structure by means of space-time binary encoding
  • Method for generating light field with sine structure by means of space-time binary encoding
  • Method for generating light field with sine structure by means of space-time binary encoding

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings, working principles and embodiments.

[0019] A spatio-temporal binary coding proposed by the present invention mainly includes four parts of standard fringe gray scale equalization, threshold quantization, error diffusion and coding. Among them, threshold quantization, error diffusion and coding are closely related.

[0020] attached figure 1 1 is a standard sinusoidal fringe pattern generated by the computer, and its mathematical form is

[0021] (1)

[0022] in f 0 Indicates the frequency of a standard sinusoidal fringe, with a period of p reciprocal relationship.

[0023] According to the formula (1), the standard sinusoidal stripe 1 grayscale distribution range generated by the computer is 0~1, and a space-time binary encoding method proposed by the present invention divides it into 2 according to the grayscale distribution of...

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Abstract

The invention belongs to the three-dimensional sensing technology and discloses a method for generating a light field with a sine structure by means of space-time binary encoding. According to the method, a standard sine fringe pattern 1 generated by a computer is equally divided into 2<n> (n>=2) sections according to gray-level distribution, then time and space encoding is conducted on each section by means of two-dimensional error diffusion to obtain 2<n> (n>=2) binary fringe patterns (2, 3, 4, ..., 5), and then linear superposition is conducted on the binary fringe patterns after the binary fringe patterns are projected and acquired through an imaging system, so that a high-quality sine fringe 6 is obtained. The projected binary fringe patterns are not affected by the non-linear response of a digital projector, the high-speed binary pattern switching function of the digital projector is fully utilized, and the speed and precision of three-dimensional surface measurement are improved.

Description

technical field [0001] The invention relates to a method for generating a sinusoidal structured light field in optical three-dimensional sensing technology, in particular to a method for generating a sinusoidal structured light field by space-time binary encoding. Background technique [0002] Optical three-dimensional sensing technology has significant advantages such as non-contact, fast measurement speed, good system flexibility, high precision, and easy automatic processing of data. It has broad application prospects. [0003] According to the different ways of three-dimensional surface modulation of structured light, it can be divided into two categories: temporal modulation and spatial modulation. The time-of-flight method requires extremely high time resolution of the sensor and is only suitable for long-distance measurement. Spatial modulation successively uses point, line, and surface structured light illumination to obtain the structured light field modulated by ...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 苏显渝朱江平游志胜
Owner SICHUAN UNIV
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