3D face measurement module and measurement method based on vcsel

Abstract

A VCSEL-based binocular three-dimensional face measurement module and timing measurement method, the module consists of a VCSEL array light source, a projection lens, a beam expander lens, a digital-to-analog conversion module, two infrared digital cameras, a frequency synchronization control module, a micro Processor, data transmission module, control circuit. The module independently controls each VCSEL light source through the control circuit, and uses the method of time sequence encoding and decoding to realize the matching of homologous points in binocular stereo vision. Using the binarized time-series pairing method expanded along the time series to match each projected pattern light point, it solves the problem that the existing VCSEL array light source requires a high degree of irrelevance and good uniformity for the projected pattern. The degree of freedom of arbitrarily arranging the VCSEL array light source is realized. The present invention proposes the specific method of the time sequence code decoding and the minimum number of coded projection patterns required by the time sequence measurement method.

Description

technical field [0001] The invention relates to the field of three-dimensional measurement of machine vision, in particular to a VCSEL-based three-dimensional face measurement module and a timing measurement method thereof. Background technique [0002] Face digitization has a wide range of applications and demands in the fields of public security and life and entertainment. Traditional two-dimensional face recognition contains limited data information, is easily disturbed by external factors, and its application scenarios are also limited. With the development of 3D measurement technology and related software and hardware, 3D face digitization is of great significance in enhancing international technological competitiveness and promoting the development of domestic manufacturing industry. [0003] 3D face data needs to be obtained through 3D reconstruction technology, and the 3D model of the target face is obtained through measurement tools and algorithms. Since face meas...

AI Technical Summary

Problems solved by technology

The structured light projection model based on time series has been used in 3D face measurement [see Prior Art 2: Zhou Changhe et al., Homologous Point Fast Matching Method for Binocular Vision 3D Measurement, Chinese Invention Patent CN 103900494A], but This method has relatively high requirements for timing projection patterns, resulting in relatively high requirements for integrated projection units, and is not suitable for integration in miniaturized modules.

[0009] In the embodiment where VCSEL arrays are used for projecting structured light, in order to obtain incoherent structured light patterns, there are special requirements for the arrangement of VCSEL light sources, which increases the difficulty in the integrated manufacturing process, and when the integrated projection unit is miniaturized, The heat dissipation of the light source and optical components is poor, and the temperature change will affect the pattern projected by the integrated projection unit, and the manufacturing error will also affect the projected pattern, thus affecting the accuracy of 3D reconstruction calculation

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