Department of Automation, Tsinghua University, Beijing, 100084, China.
Shanghai Institute of Optics and Fine Mechanics, Shanghai, 201800, China.
Sci Rep. 2017 Mar 30;7:45325. doi: 10.1038/srep45325.
Computational ghost imaging (CGI) achieves single-pixel imaging by using a Spatial Light Modulator (SLM) to generate structured illuminations for spatially resolved information encoding. The imaging speed of CGI is limited by the modulation frequency of available SLMs, and sets back its practical applications. This paper proposes to bypass this limitation by trading off SLM's redundant spatial resolution for multiplication of the modulation frequency. Specifically, a pair of galvanic mirrors sweeping across the high resolution SLM multiply the modulation frequency within the spatial resolution gap between SLM and the final reconstruction. A proof-of-principle setup with two middle end galvanic mirrors achieves ghost imaging as fast as 42 Hz at 80 × 80-pixel resolution, 5 times faster than state-of-the-arts, and holds potential for one magnitude further multiplication by hardware upgrading. Our approach brings a significant improvement in the imaging speed of ghost imaging and pushes ghost imaging towards practical applications.
计算鬼成像（CGI）通过使用空间光调制器（SLM）生成结构照明来实现单像素成像，从而对空间分辨信息进行编码。CGI 的成像速度受到可用 SLM 调制频率的限制，这限制了其实际应用。本文提出通过牺牲 SLM 的冗余空间分辨率来换取调制频率的乘法来绕过这个限制。具体来说，一对扫过高分辨率 SLM 的 galvanic 镜在 SLM 和最终重建之间的空间分辨率间隙内将调制频率倍增。一个带有两个中间端 galvanic 镜的原理验证设置以 80×80 像素的分辨率实现了高达 42 Hz 的鬼成像，速度比现有技术快 5 倍，并且通过硬件升级还有进一步提高一数量级的潜力。我们的方法显著提高了鬼成像的成像速度，使鬼成像更趋于实际应用。
