Realistic Defocus Blur for Multiplane Computer-Generated Holography
This addresses the challenge of realistic defocus effects in holographic displays, which is an incremental improvement for applications like VR/AR and medical imaging.
The paper tackles the problem of generating high-quality holograms with natural defocus blur in multiplane computer-generated holography by introducing a new targeting scheme and loss function, achieving artefact-free reconstructions validated on a proof-of-concept display.
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.