Beyond Spherical Harmonics: Rethinking Appearance Models for Radiance Reconstruction

📄 arXiv: 2606.09794v1 📥 PDF

作者: Ewa Miazga, Jorge Condor, Piotr Didyk

分类: cs.CV, cs.GR

发布日期: 2026-06-08

备注: 19 pages, 11 figures


💡 一句话要点

提出归一化各向异性球面Gabor函数以解决视角依赖外观建模问题

🎯 匹配领域: 支柱三:空间感知与语义 (Perception & Semantics)

关键词: 视角依赖建模 球面谐波 高频外观 计算机图形学 虚拟现实 增强现实 模型训练

📋 核心要点

  1. 现有方法在视角依赖外观建模中面临高频现象捕捉困难,导致表现过于平滑或扩散。
  2. 本文提出归一化各向异性球面Gabor函数,以高效建模高频外观效应,克服传统SH的局限性。
  3. 实验结果表明,所提方法在重建视角依赖现象时,内存使用减少了五倍,效果显著提升。

📝 摘要(中文)

视角依赖的外观建模在新视图合成和重建中仍然是一个具有挑战性的问题。准确表示复杂的角度效应通常需要大量的内存和计算资源。现有的基于学习的方法通常依赖于球面谐波(SH),但捕捉高频现象如镜面反射需要高阶展开,导致内存使用和计算成本增加。为了解决这些限制,本文系统评估了多种球面函数,并提出了一种新的球面公式——归一化各向异性球面Gabor函数,能够高效建模和学习高频外观效应,同时保持紧凑的表示。与现有方法相比,该函数在重建视角依赖现象如光斑时,内存效率提高了五倍,并且计算效率更高。

🔬 方法详解

问题定义:本文旨在解决现有视角依赖外观建模方法在捕捉高频现象时的不足,尤其是高阶球面谐波导致的高内存和计算成本问题。

核心思路:提出归一化各向异性球面Gabor函数,通过新的数学形式来有效捕捉高频外观效应,同时保持内存的紧凑性和计算的高效性。

技术框架:整体架构包括对多种球面函数的系统评估,选择最优函数形式,并在此基础上构建新的外观模型。主要模块包括函数设计、模型训练和性能验证。

关键创新:最重要的创新在于引入归一化各向异性球面Gabor函数,这一函数能够在保持内存效率的同时,显著提高对复杂视角依赖现象的重建质量。

关键设计:在设计中,选择了适当的参数设置以优化函数性能,并通过特定的损失函数来指导模型训练,确保高频特征的有效学习。

🖼️ 关键图片

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📊 实验亮点

实验结果显示,所提归一化各向异性球面Gabor函数在重建视角依赖现象时,内存使用效率提高了五倍,且在质量上超越了传统方法,特别是在捕捉光斑等高频现象方面表现优异。

🎯 应用场景

该研究具有广泛的应用潜力,尤其在计算机图形学、虚拟现实和增强现实等领域。通过提高视角依赖外观的重建质量,可以显著提升用户体验,推动相关技术的发展和应用。

📄 摘要(原文)

View-dependent appearance modeling remains a challenging problem in novel-view synthesis and reconstruction. Accurately representing complex angular effects often requires substantial memory and computational resources. For new learning-based methods, a common approach is to rely on SH. However, capturing high-frequency phenomena such as specular reflections demands high-order expansions, which increase memory usage and computational cost. Consequently, most methods employ low-order SH, which limits the ability to model complex view-dependent effects, resulting in overly smooth or diffuse representations. To address these limitations, we systematically evaluate a wide range of spherical functions in the context of scene reconstruction. Some of them are introduced to graphics and computer vision for the first time in this paper. Based on the insights from the experiment, we develop a novel spherical formulation, the Normalized Anisotropic Spherical Gabor function that enables efficient modeling and learning of high-frequency appearance effects while maintaining compact representation. Compared to existing approaches, our function achieves higher-quality reconstruction of view-dependent phenomena such as glints, while being up to five times more memory-efficient and more efficient to evaluate. We validate its performance in radiance-field reconstruction tasks.