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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

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Shadowless projector using coded large-aperture Fresnel lens.

Hiroki Kusuyama, Tomoya Nakamura, Daisuke Iwai

|March 18, 2026

Summary

This summary is machine-generated.

This study introduces a novel coded large-aperture (LA) Fresnel lens system for delay-free shadowless projection mapping (PM). The system optimizes aperture patterns for improved deblurring and shadow suppression, validated through simulations and experiments.

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Area of Science:

Optics and Photonics
Computer Vision
Digital Imaging

Background:

Large-aperture (LA) projection effectively suppresses shadows without delay but often results in significant blur.
Existing methods struggle to balance deblurring and shadow suppression in LA projection systems.

Purpose of the Study:

To propose a delay-free shadowless projection mapping (PM) system using a coded large-aperture (LA) Fresnel lens.
To develop methods for optimizing hardware and software configurations for coded LA projectors.
To achieve enhanced deblurring and shadow suppression performance.

Main Methods:

Formulation of the Fresnel lens surface profile and development of a differentiable ray tracing simulator for coded LA projectors.
Optimization of aperture patterns using a framework based on specific norms for shadowless projectors.
Minimization of a combined loss function including broadband modulation transfer function (MTF), light transmission efficiency, and shadow suppression performance.

Main Results:

A differentiable ray tracing simulator enabling efficient calculation of optimal aperture patterns without physical projection.
An optimization framework yielding aperture patterns that balance MTF, light efficiency, and shadow suppression.
Validation of the proposed techniques through simulation and projection experiments on a proof-of-concept prototype.

Conclusions:

The coded LA projector effectively addresses the blurriness issue in LA projection systems.
The proposed optimization framework and simulator provide a robust method for designing high-performance shadowless projection systems.
The developed system demonstrates significant potential for applications requiring delay-free, high-quality shadowless projection mapping.