Abstract
A pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye is proposed. A diffractive optical element is used to enlarge field of view (FOV) of transmitting system and a receiving system consisting of a non-uniform microlens array, an aperture array, and an avalanche photodiode array is designed. The non-uniform microlens array is arranged on a curved surface to mimic large FOV feature of the compound eye. Meanwhile, the non-uniform microlens array is modeled to mimic space-variant resolution property of the human eye. On the basis of the proposed system, some simulation experiments are carried out. Results show that the entire FOV is up to 52°, and the resolution is 30 × 18. The proposed system has a high resolution in the center FOV and a low resolution in the peripheral FOV. The rotation and scaling invariances of the human eye are verified on the proposed system. The signal-to-noise ratio (SNR) increases with the increase in the number of rings and the maximum SNR locates at the outmost periphery area. This work is beneficial to the design of the pulsed laser three-dimensional imaging system with large FOV, high speed, and high resolution.
Highlights
In recent years, pulsed-laser three-dimensional (3D) imaging has become as an active imaging technology and has received much attention due to its simplicity in principle, ability of anti-interference, and long imaging distance range[1,2]
For scanning pulsed-laser 3D imaging system (e.g., MEMS, scanning mirror, galvanometer scanner, and Risley prism pair), the field of view (FOV) largely depends on scan range of scanning components and the capability to obtain a high resolution image relies largely on the high-resolution scanning angle and a large number of scanning steps of the scanning components, which results in a high time consumption[12,13,14,15,16]
The experiments include imaging with large FOV to mimic the compound eye and imaging with space-variant resolution, rotation and the scale invariances to imitate the retina-like property of the human eye
Summary
In recent years, pulsed-laser three-dimensional (3D) imaging has become as an active imaging technology and has received much attention due to its simplicity in principle, ability of anti-interference, and long imaging distance range[1,2]. We study a pulsed-laser 3D imaging method combined the large FOV feature of the compound eye and the space-variant resolution property of the human eye simultaneously. A receiving system containing several non-uniform microlenses is designed to mimic the space-variant property of the human eye The aim of this design is to achieve high resolution in the center of the FOV compress the image information in the periphery of the FOV for improving imaging speed. These non-uniform microlenses are distributed on a curved surface to imitate the large FOV feature of the compound eye
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