The compound eye system has many unique advantages, enabling organisms to quickly and accurately obtain the three-dimensional spatial information of the target. Therefore, its bionic applications have great potential in object localization, dynamic tracking, and 3D reconstruction. However, the current bionic compound eye systems still have great difficulties in target detection. Most of the bionic compound eye systems only verify the possibility of three-dimensional (3D) detection, and there is no suitable calibration and detection scheme. In this article, a fiber-optic stereo bionic compound eye is designed, and a simple and rapid calibration method suitable for this system is selected by comparing two effective optical information. Further, the system quantitatively analyzes the detection performance of the target to achieve precise positioning and dynamic trajectory tracking. In the static detection experiment, the average detection errors of the 3D position at the horizontal angle, the elevation angle and the depth are 0.33 • , 0.32 • and 1.84 mm, respectively. In the dynamic trajectory tracking experiment, the circle radius errors in the X-Z plane and Y-Z plane are 0.04 and 2.20 mm, respectively. The proposed system provides a new perspective to understand the nature of the compound eye.
K E Y W O R D Sbionic compound eyes 1 , dynamic track tracking 4 , neural network 5 , stereo vision system 2 , three-dimensional detection 3
INTRODUCTIONAs a natural multi-aperture optical system, due to its special physiological structure, 1,2 the compound eyes have the characteristics of small size, high integration, large field of view, 3 high resolution rate, and sensitivity to moving objects. 4 So, it has great advantages in three-dimensional (3D) target detection. The bionic compound eyes are mainly divided into planar compound eye 5-13 and curved compound eye. [14][15][16][17][18][19][20][21] The planar compound eye is small in size and has a fast response, but is limited by the range of the field of view (FOV). The curved compound eye is the closest to the biological compound eye in terms of structure and performance, and it is also the main design idea at present. However, it is difficult to acquire accurate and distortion-free optical images in a large field of view. The nature is very mysterious, the computation principle [22][23][24][25][26][27] of the compound eye is an interesting topic.Research on object detection from existing bionic compound eye shows that such a vision system has the potential for at least qualitative object detection. Richard Hornsey's team proposed a DragonflEye system based on fiber bundle coupling, and realized the tracking of planar target through vanishing point and Z-translation image center calibration techniques. 18,19 The method has a complex structure and is difficult to manufacture, though it does not require calibration of a single sub-eye and has high detection accuracy. Song et al. explored the possibility of orientation and dis-