日光对532nm激光成像性能影响实验分析

532 nm激光成像雷达在成像过程中容易受到日光干扰而降低图像信噪比。利用532 nm条纹管激光雷达对复杂场景(建筑物群)进行昼夜成像实验,并采用直方图统计法分析同一场景分别在白昼和夜晚的激光强度像和距离像的像素值分布,进而分析日光对激光成像性能影响。实验结果表明:日照光会提高激光强度像的亮度以及背景/目标的对比度,同时也增加了距离像的空天背景噪声;夜晚激光距离像信噪比高,但目标强度像对比度不佳。

Experimental analysis of the effect of sunlight on 532 nm laser imaging properties

532 nm laser imaging radar can be easily interfered by the sunlight in the imaging process and then it reduces the image SNR. The 532 nm streak tube laser radar was used to carry on the imaging experiment of the multiple scene(groups of buildings) respectively in the day time and night, and the histogram statistics method was used to analyze the distribution of pixel values of laser intensity image and laser range image in the day time and night of the same scene, then the effect of sunlight on the laser imaging properties was analyzed. The experiment results show that the sunlight can increase the brightness and the background/target contrast ratio of laser intensity image, at the same time it can also increase the sky background noise of the range image; and the laser range image has high signal-to-noise ratio at night, but target intensity image contrat ratio is poor.