# Fast and High Quality Light Field Acquisition using Defocus Modulation

## TL;DR

This paper introduces a fast light field acquisition method using defocus modulation instead of axial movement, enabling high-quality reconstruction with less time and better alignment.

## Contribution

The proposed approach replaces physical focal plane sweeping with defocus modulation, improving speed and accuracy in light field capture.

## Key findings

- Enables rapid light field acquisition with precise focal control.
- Supports multiple reconstruction methods like LFMI and LFBP.
- Reduces time and alignment issues compared to traditional methods.

## Abstract

Light field reconstruction from images captured by focal plane sweeping, such as light field moment imaging (LFMI) and light field reconstruction with back projection (LFBP), can achieve high lateral resolution comparable to the modern camera sensor. This is impossible for the conventional lens array based light field capture systems. However, capturing a series of focal sweeping images along the optical axis is time consuming and requires fine alignment, and different focal plane based light field reconstruction techniques require images with different characteristics. To solve this problem, we present an efficient approach for fast light field acquisition with precise focal plane sweeping capture by defocus modulation rather than axial movement. Because of the controllable point spread function, we can capture images for light field reconstruction with both LFMI and LFBP.