Yu Zhan, Yuan Sheng, Wu Han, Li Yue, Zhou Dingfu, Zhou Xin
Opt Lett. 2024 May 15;49(10):2789-2792. doi: 10.1364/OL.520220.
Ghost imaging techniques using low-cost bucket detectors have unrivaled advantages for some wavebands where plane array detectors are not available or where focusing is difficult. In these bands, fine mask plates are the key to implementing high-resolution and quality ghost imaging. However, manufacturing a large number of mask plates is necessary but undoubtedly expensive in traditional Hadamard ghost imaging (HGI). Inspired by the spread spectrum technology, Hadamard ghost imaging based on spread spectrum (HGI-SS) is proposed, in which only two sets of a small number of mask plates are needed to accomplish Nyquist sampling for the object. Their numbers are equal to the lateral pixel resolution and the vertical pixel resolution of the object, respectively. Optical experiments verify the effectiveness of the scheme. For ghost imaging with a resolution requirement of 128 × 128 pixels, HGI-SS needs to prepare only 256 mask plates, while the traditional HGI needs to prepare 16,384 mask plates. HGI-SS may be helpful to expand the pixel resolution of imaging at a relatively low cost of mask plates.
对于某些平面阵列探测器无法使用或聚焦困难的波段，使用低成本桶探测器的鬼成像技术具有无与伦比的优势。在这些波段中，精细掩模板是实现高分辨率和高质量鬼成像的关键。然而，在传统的哈达玛鬼成像（HGI）中，制造大量掩模板是必要的，但无疑成本高昂。受扩频技术启发，提出了基于扩频的哈达玛鬼成像（HGI-SS），其中仅需两组少量掩模板即可完成对物体的奈奎斯特采样。它们的数量分别等于物体的横向像素分辨率和纵向像素分辨率。光学实验验证了该方案的有效性。对于分辨率要求为128×128像素的鬼成像，HGI-SS仅需准备256个掩模板，而传统HGI则需要准备16384个掩模板。HGI-SS可能有助于以相对较低的掩模板成本扩展成像的像素分辨率。
