四通道可见光光谱相机的设计

随着光谱技术的发展,多光谱相机在农业、医疗、机器视觉、遥感探测等领域都得到了广泛的应用。提出一款小型化四通道可见光波段的多光谱相机,尺寸为107 mm×110 mm×74 mm,质量1 043 g,适合搭载在小型化无人机上进行遥感探测。相机系统采用棱镜分光光路设计方案,避免光程差和光轴偏移;设计开发的四通道可见光多光谱相机,采用一个FPGA控制器同时驱动4个图像传感器,实现4个通道像素级同步采集,曝光完全一致。实验结果显示:在红、绿、蓝3个特定波段及全波段相机可实时输出图像,既可输出某个特定波段图像(60 fps),也可同时输出4个波段图像(15 fps),有利于多波段图像同步采集,以及多光谱图像融合的研究。

Design of four-channel visible-spectral camera

With the development of spectroscopy technology, multi-spectral cameras have been widely used in agriculture, medical, machine vision, remote sensing and other fields. This paper proposes a miniaturized four-channel visible-waveband multi-spectral camera with a size of 107 mm×110 mm×74 mm and a mass of 1 043 g, which is especially suitable for remote sensing detection on a miniaturized drone. The camera system adopts a prism beam splitting optical path design scheme to avoid optical path difference and optical axis shift. The specially designed four-channel multi-spectral camera in visible light uses an field-programmable gate array (FPGA) controller to simultaneously drive 4 image sensors to realize four-channel pixel-level synchronous acquisition, and the exposure is exactly the same.The test results show that at the 3 specific bands of red, green and blue and the full band, the camera can output images in real time, which can output a specific band image (60 fps) or 4 band images (15 fps) at the same time, which is beneficial to the synchronous acquisition of multi-band images and the research on multi-spectral images fusion.