PhlatCam: Designed Phase-Mask Based Thin Lensless Camera.

Area of Science:

• Optics and Photonics
• Computational Imaging
• Sensor Technology

Background:

• Traditional cameras rely on bulky lenses for image formation.
• Lensless imaging offers miniaturization potential but faces challenges in resolution and depth recovery.
• Existing lensless techniques often require complex optical setups or multiple measurements.

Purpose of the Study:

• To demonstrate a versatile, thin lensless camera system.
• To develop a general framework for designing phase masks for lensless imaging.
• To achieve high-resolution 2D and 3D imaging capabilities from a single encoded measurement.

Main Methods:

• Utilized wave optics and phase retrieval algorithms.
• Designed a novel contour-based point-spread function (PSF) for efficient information transfer.
• Implemented fast linear and iterative nonlinear reconstruction methods.

Main Results:

• Successfully created a camera with a phase mask positioned less than 2 mm from the sensor.
• Demonstrated the reconstruction of high-resolution 2D images.
• Achieved computational refocusing and 3D imaging from single 2D measurements.

Conclusions:

• The developed phase-mask-based lensless camera offers a versatile and compact imaging solution.
• The contour-based PSF design maximizes information transfer to the sensor, enabling high-quality reconstructions.
• This approach facilitates advanced imaging tasks like 3D reconstruction in a thin, lensless form factor.