A Lensless Polarization Camera

A team of researchers from Tel Aviv University, including Noa Kraicer, Shay Elmalem, Erez Yosef, Hani Barhum, and Raja Giryes, has published a paper on arXiv detailing a novel lensless polarization camera. The system fundamentally rethinks camera design by eliminating the traditional lens. In its place, it uses a diffuser and a simple striped polarization mask as a coding element. This optical setup captures a single, encoded snapshot, which is then computationally reconstructed to recover four distinct linear polarization images. The work builds on prior lensless imaging concepts like DiffuserCam but specifically addresses the challenge of polarization imaging, which typically requires bulky and expensive spatial or temporal multiplexing hardware.

By explicitly modeling the polarization-encoded measurements in their reconstruction algorithm, the team demonstrates that high-quality polarization data can be extracted from this compact, single-shot system. Their results not only prove the concept's viability but also identify the key physical factors that govern reconstruction quality, providing a roadmap for developing practical, high-performance systems. This approach promises to drastically reduce the volume, weight, and cost of polarization cameras, which are used in applications like material inspection, remote sensing, and advanced computer vision where perceiving light polarization provides critical information beyond standard intensity and color.