紧凑双光路单像素成像系统(特邀)

Compact dual optical path single-pixel imaging system(Invited)

不同于使用阵列探测器的常规数码相机,单像素相机使用不具空间分辨能力的单像素探测器对目标进行成像。由于其工作波长覆盖广、灵敏度高,单像素相机在特殊波段和弱光照明等特殊场景中较普通相机更有优势,在遥感探测、显微成像、军事侦察等领域得到广泛应用。提出一种紧凑型单像素成像系统,该系统利用数字微镜阵列的工作特性形成了对称的折叠双光路以快速完成差分测量。紧凑的结构降低了相机系统的体积,使系统可采用标准尼康镜头作为成像透镜。系统具有双光路差分成像、双光路平均降噪、宽谱波段成像、双光路交替采样等多种模式,并且可根据场景对重建图像信噪比、实时帧率、成像波段的不同需求切换应用模式。基于系统样机的实验结果表明其能实现预期的功能、达到相应的性能。紧凑型单像素成像系统的提出是一次较成功的单像素成像工程化尝试,为单像素成像技术后续的实际应用奠定了较好的技术和工程基础。

Unlike conventional digital cameras that used array detectors, single-pixel cameras used single-pixel detectors without spatial resolution to image targets. Due to its wide operating wavelength coverage and high sensitivity, single-pixel cameras are more advantageous than ordinary cameras in special scenarios such as special wavelengths and low light illumination, and are widely used in remote sensing detection, microscopic imaging,military reconnaissance, and other fields. A compact single-pixel imaging system was proposed, which used the working characteristics of the digital micro-mirror array to form a symmetrical folded double optical path to quickly complete differential measurement. The compact structure reduced the size of the camera system and allowed the system to use a standard Nikon lens as the imaging lens. The system had various modes such as dualoptical differential imaging, dual-optical averaging noise reduction, broad-spectrum band imaging, and dualoptical alternate sampling, and the application modes could be switched according to the different needs of the scene for reconstructed image signal-to-noise ratio, real-time frame rate, and imaging band. The experimental results based on the system prototype showed that it could realize the expected functions and achieve the corresponding performance. The proposed compact single-pixel imaging system was a successful engineering attempt of single-pixel imaging, which laid a good technical and engineering foundation for the subsequent practical application of single-pixel imaging technology.