Lensless Imaging by Compressive Sensing

TL;DR

This paper introduces a lensless compressive imaging system that uses an aperture array and a single sensor, enabling image capture without lenses and applicable across various spectra.

Contribution

The paper presents a novel lensless imaging architecture utilizing controllable aperture arrays and compressive sensing, suitable for multiple spectra and multi-view imaging.

Findings

Prototype successfully built with LCD panel and sensor

Capable of imaging in visible spectrum and other spectra

Simple and reliable architecture without lenses

Abstract

In this paper, we propose a lensless compressive imaging architecture. The architecture consists of two components, an aperture assembly and a sensor. No lens is used. The aperture assembly consists of a two dimensional array of aperture elements. The transmittance of each aperture element is independently controllable. The sensor is a single detection element. A compressive sensing matrix is implemented by adjusting the transmittance of the individual aperture elements according to the values of the sensing matrix. The proposed architecture is simple and reliable because no lens is used. The architecture can be used for capturing images of visible and other spectra such as infrared, or millimeter waves, in surveillance applications for detecting anomalies or extracting features such as speed of moving objects. Multiple sensors may be used with a single aperture assembly to capture multi-view images simultaneously. A prototype was built by using a LCD panel and a photoelectric sensor for capturing images of visible spectrum.