利用表面微结构产生纹理，提升无纹理场景的深度感知能力
A second-order theory of texture for depth from focus
- 基于波动光学构建二级纹理理论，解释微结构如何生成视觉纹理
- 使用窄带滤光片可显著增强纹理对比度，深度重建精度大幅提升
- 适用于低纹理或看似无纹理的自然场景，适合被动深度恢复任务
我们提出一种基于波动光学的粗糙表面纹理外观理论，强调纹理在被动式深度聚焦中的作用。研究表明，即使传统计算机视觉认为无纹理的表面，因表面微结构引起的主观散斑也会产生纹理外观。我们分析了这种二级纹理的特性，发现通过使用窄带光谱滤波器，在自然光照条件下即可显著增强其对比度。这一方法在理论、仿真和真实实验中均验证了对看似无纹理场景的被动深度重建有显著提升。
原文摘要 · Abstract (English)
We present a theory of textured appearance of optically rough surfaces based on wave optics, emphasizing the role of texture for passive depth from focus. Our theory shows that even surfaces that traditional computer vision would consider textureless can produce textured appearance, due to subjective speckle from surface microgeometry. We analyze the properties of this second-order texture, and show that we can enhance its contrast under natural ambient lighting by simply using a narrowband spectral filter. Doing so results in dramatic improvements in passive depth reconstruction of seemingly textureless scenes, as we demonstrate through extensive theory, simulations, and real-world experiments.
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