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The freedom of design of coded masks used by mask-based lensless cameras isan advantage these systems have when compared to lens-based ones. We leveragethis freedom of design to propose a shape-preserving optimization scheme for aradial-type amplitude coded mask, used for extending the depth of field (DOF)of a lensless camera. Our goal is to identify the best parameters for the codedmask, while retaining its radial characteristics and therefore extended-DOFcapabilities. We show that our optimized radial mask achieved better overallfrequency response when compared to a naive implementation of a radial mask. Wealso quantitatively and qualitatively demonstrated the extended DOF imagingachieved by our optimized radial mask in simulations by comparing it todifferent non-radial coded masks. Finally, we built a prototype camera tovalidate the extended DOF capabilities of our coded mask in real scenarios.

Extended Depth-of-Field Lensless Imaging using an Optimized Radial Mask