Single-shot lensless imaging with fresnel zone aperture and incoherent illumination

• 作者: Jiachen Wu Hua Zhang Wenhui Zhang Guofan Jin Liangcai Cao George Barbastathis
• 来源期刊: 光：科学与应用（英文版）
• 年，卷（期）: 2020,（3）
• 所属期刊栏目: Original Articles
• 页码范围: 563-573
• 页数: 11页
• 语种: 英文

摘要

Lensless imaging eliminates the need for geometric isomorphism between a scene and an image while allowing the construction of compact, lightweight imaging systems. However, a challenging inverse problem remains due to the low reconstructed signal-to-noise ratio. Current implementations require multiple masks or multiple shots to denoise the reconstruction. We propose single-shot lensless imaging with a Fresnel zone aperture and incoherent illumination. By using the Fresnel zone aperture to encode the incoherent rays in wavefront-like form, the captured pattern has the same form as the inline hologram. Since conventional backpropagation reconstruction is troubled by the twin-image problem, we show that the compressive sensing algorithm is effective in removing this twin-image artifact due to the sparsity in natural scenes. The reconstruction with a significantly improved signal-to-noise ratio from a single-shot image promotes a camera architecture that is flat and reliable in its structure and free of the need for strict calibration.