Journal papers
Leyla A. Kabuli; Clara S. Hung; Vasilisa Ponomarenko; Eric Markley; Laura Waller
ConvRML: high-quality lensless imaging with random multi-focal lenslets Journal Article
In: Opt. Express, vol. 34, no. 18, pp. 33992–34005, 2026.
Abstract | Links | BibTeX | Tags: Imaging systems; Machine vision; Microlens arrays; Modulation transfer function; Optical elements; Systems design
@article{Kabuli:26b,
title = {ConvRML: high-quality lensless imaging with random multi-focal lenslets},
author = {Leyla A. Kabuli and Clara S. Hung and Vasilisa Ponomarenko and Eric Markley and Laura Waller},
url = {https://opg.optica.org/oe/abstract.cfm?URI=oe-34-18-33992},
doi = {10.1364/OE.608614},
year = {2026},
date = {2026-09-01},
journal = {Opt. Express},
volume = {34},
number = {18},
pages = {33992–34005},
publisher = {Optica Publishing Group},
abstract = {Mask-based lensless imagers use simple optics and computational reconstruction to design compact form factor cameras with compressive imaging ability. However, these imagers generally suffer from poor reconstruction quality. Here, we describe several advances in both hardware and software that result in improved lensless imaging quality. First, we use a precision-manufactured random multi-focal lenslet (RML) phase mask to produce improved measurements with reduced multiplexing. Next, we implement a ConvNeXt-based reconstruction architecture, which provides up to 4.6 dB improvement in peak signal-to-noise ratio over state-of-the-art attention-based architectures. Finally, we establish a parallel imaging setup that simultaneously images a scene with RML, diffuser, and lens systems, with which we collect datasets with 100,000 measurements for each system, to be used for reconstruction model training and evaluation. Using this standardized system, we quantify the improved measurement quality of the RML compared to a diffuser using the modulation transfer function and mutual information. Our ConvRML system benefits from both the optical and the computational developments presented in this work, and our contributions establish resources to support the continued development of high-quality, compact, and compressive lensless imagers.},
keywords = {Imaging systems; Machine vision; Microlens arrays; Modulation transfer function; Optical elements; Systems design},
pubstate = {published},
tppubtype = {article}
}
Mask-based lensless imagers use simple optics and computational reconstruction to design compact form factor cameras with compressive imaging ability. However, these imagers generally suffer from poor reconstruction quality. Here, we describe several advances in both hardware and software that result in improved lensless imaging quality. First, we use a precision-manufactured random multi-focal lenslet (RML) phase mask to produce improved measurements with reduced multiplexing. Next, we implement a ConvNeXt-based reconstruction architecture, which provides up to 4.6 dB improvement in peak signal-to-noise ratio over state-of-the-art attention-based architectures. Finally, we establish a parallel imaging setup that simultaneously images a scene with RML, diffuser, and lens systems, with which we collect datasets with 100,000 measurements for each system, to be used for reconstruction model training and evaluation. Using this standardized system, we quantify the improved measurement quality of the RML compared to a diffuser using the modulation transfer function and mutual information. Our ConvRML system benefits from both the optical and the computational developments presented in this work, and our contributions establish resources to support the continued development of high-quality, compact, and compressive lensless imagers.