Laser scanning head-up display has the characteristics of small size, high contrast, and no background halo. However, the power of direct modulation laser diode and the driving current of laser driver chip with high frequency about 100 MHz are limited, and the high brightness advantage of laser scanning display is still difficult to play, which also hinders the application and development of this technology. In this paper, a simple and effective light module is designed by using the shaping and coupling technology of multi laser diodes array. Two driving chips and six laser diodes are introduced, which is optimized the layout of laser diodes according to the characteristics of fast and slow axis. Finally, a single beam is projected to the mirror of MOEMS for laser scanning display by optical coupling fiber. The multi laser diodes array significantly reduces the laser coherence and suppresses the laser projection speckle effect. The experimental results show that the light module achieves more than 300 mW laser output power, promotes the brightness of the display, and is conducive to expanding the application of laser scanning display technology in the fields of projection, avionics and vehicle head-up display.
Surface reconstruction technology needs to fit the collected point cloud data into an expression with a complete base function. How to improve the fitting accuracy of surface reconstruction is the focus of this research. In this paper, aiming at the surface fitting model based on Gaussian radial basis function(RBF), the influence of shape factor selection on surface fitting accuracy is studied, and a new method for calculating RBF shape factor is proposed. The shape factor is connected with the size of the surface to be fitted, which strengthens the relationship among the kernels. Taking the given point cloud data as an example, the simulation experiments were carried out, and the fitting accuracy of different shape factors was compared, and the curved surfaces of different shapes were fitted. The results show that the accuracy of surface fitting can be improved by choosing shape factor combined with the size of fitting area; surface fitting based on RBF is suitable for the surface with small curvature and gentle surface; RBF can be used for the description of non-rotational symmetric surface, but the fitting accuracy will decrease.
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