Realistic Defocus Blur for Multiplane Computer-Generated Holography

TL;DR

This paper presents a novel multiplane CGH computation method that produces high-quality, artefact-free holograms with realistic defocus blur, enhancing the visual realism of holographic displays.

Contribution

It introduces a new targeting scheme and loss function for multiplane CGH, supporting phase-only calculations with various iterative and non-iterative techniques, improving image quality.

Findings

Achieved high-quality holograms with natural defocus blur.

Validated method experimentally on a proof-of-concept display.

Compared various algorithms demonstrating the effectiveness of the approach.

Abstract

This paper introduces a new multiplane CGH computation method to reconstruct artefact-free high-quality holograms with natural-looking defocus blur. Our method introduces a new targeting scheme and a new loss function. While the targeting scheme accounts for defocused parts of the scene at each depth plane, the new loss function analyzes focused and defocused parts separately in reconstructed images. Our method support phase-only CGH calculations using various iterative (e.g., Gerchberg-Saxton, Gradient Descent) and non-iterative (e.g., Double Phase) CGH techniques. We achieve our best image quality using a modified gradient descent-based optimization recipe where we introduce a constraint inspired by the double phase method. We validate our method experimentally using our proof-of-concept holographic display, comparing various algorithms, including multi-depth scenes with sparse and dense contents.