The optical three-dimension measurement methods have been widely used in face recognition, machine vision, biomedical imaging, virtual reality and aerospace with the advantages of fast speed, high precision and non-contact measurement. Recently, the trend of structured light 3D reconstruction tends to be real-time with improving accuracy and reducing the dependence of time domain. The structured light coding is an active measurement method which could provide abundant feature points. The 2D gold matrix is a spatial coding method and it provides a new type of structured light for optical 3D measurement. This scheme provides the dynamic 2D spatial information based on the fast decoding from the encoded projected light. Here, we proposed a binocular stereo vision system based on the structured light encoded by 2D gold matrix. Only a pair of images, which could be captured in real-time by the two cameras, are needed for 3D reconstruction. The experiment shows that the decoding success rate is up to 99.48% for non-planar object. The system is simple in structure and low in cost. It is expected to be applied to real-time 3D measurement fields such as face recognition and biomedical imaging in the future.
High-speed and high-precision human face 3D shape measurement plays a very important role in diverse applications such as human-computer interaction, 3D face recognition, Virtual Reality. This paper introduces a structured light system based on VCSEL(Vertical Cavity Surface Emitting Laser) with one simulated projectors and two camera for human face 3D shape measurement. Large-scale production cost of VCSEL is low, because of the manufacturing process compatible with LED. VCSEL has the advantages of projecting a large area of diffractive structure light and easy to integrate into lens array internally. The process of VCSEL projecting the structural light that changes over time to human face is simulated by computer. The ICP algorithm is used to match the image of single frame structure light from the right camera to the left camera. A single frame image of three-dimensional face point cloud is obtained by using binocular stereo vision principle. The multi-frame images of point cloud that change along time series are superposed to obtain higher density point cloud data and improve the measurement accuracy. This 3D measurement based on VCSEL has advantages of low cost, high precision, and small size and should be useful for practical applications.
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