Lensless imaging, which replaces traditional lenses with optical modulators and computational reconstruction algorithms, offers advantages in size, weight, cost, and scalability. Various lensless imaging techniques, including illumination-modulated, mask-modulated, and programmable-modulator systems, have emerged, each with unique characteristics and applications in areas like microscopy, photography, and 3D imaging.

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This review paper provides a comprehensive and well-structured overview of recent advancements in lensless imaging. It effectively covers various aspects, including design principles, different modulation techniques, reconstruction algorithms, and applications. While the paper itself does not present new research, it serves as a valuable resource for researchers and practitioners interested in this field. The rating is 4 because, although it's a comprehensive review, it lacks a novel research contribution.