通过反渲染恢复航空摄影测量图像反照率的一般方法

IF 10.6 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
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引用次数: 0

摘要

合成三维环境的室外场景建模需要从原始图像中恢复反射率/反照率信息,由于这一过程中存在复杂的未建模物理现象(如间接照明、体散射、镜面反射),因此这是一个难以解决的问题。在实际应用中,这一问题仍未得到解决。恢复的反照率可以促进模型的重新照明和着色,从而进一步增强渲染模型的真实感和数字双胞胎的应用。通常情况下,摄影测量三维模型只是将源图像作为纹理素材,这就在纹理中嵌入了(捕捉时)不需要的照明伪影。因此,这些 "污染 "纹理对于合成环境的逼真渲染来说是不理想的。此外,这些内嵌的环境光照还会给不同图像之间的光照一致性带来挑战,从而导致图像匹配的不确定性。本文提出了一个通用的图像形成模型,用于从自然光照下的典型航空摄影测量图像中恢复反照率,并推导出反模型,通过反渲染内在图像分解来解析反照率信息。我们的方法基于这样一个事实,即在航空摄影测量中,太阳光照和场景几何都是可以估算的,因此它们可以为这个问题提供直接输入。除了通过典型的无人机摄影测量采集获得的数据外,这种基于物理学的方法不需要额外的输入,而且性能优于现有方法。我们还证明,恢复的反照率图像可以反过来改进摄影测量中的典型图像处理任务,如特征和密集匹配、边缘和线条提取。[这项工作扩展了我们之前在 2022 年国际摄影测量和遥感学会大会上发表的 "在摄影测量处理中恢复航空图像反照率的新型本征图像分解方法 "的工作]。代码将发布在
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A general albedo recovery approach for aerial photogrammetric images through inverse rendering

Modeling outdoor scenes for the synthetic 3D environment requires the recovery of reflectance/albedo information from raw images, which is an ill-posed problem due to the complicated unmodeled physics in this process (e.g., indirect lighting, volume scattering, specular reflection). The problem remains unsolved in a practical context. The recovered albedo can facilitate model relighting and shading, which can further enhance the realism of rendered models and the applications of digital twins. Typically, photogrammetric 3D models simply take the source images as texture materials, which inherently embed unwanted lighting artifacts (at the time of capture) into the texture. Therefore, these “polluted” textures are suboptimal for a synthetic environment to enable realistic rendering. In addition, these embedded environmental lightings further bring challenges to photo-consistencies across different images that cause image-matching uncertainties. This paper presents a general image formation model for albedo recovery from typical aerial photogrammetric images under natural illuminations and derives the inverse model to resolve the albedo information through inverse rendering intrinsic image decomposition. Our approach builds on the fact that both the sun illumination and scene geometry are estimable in aerial photogrammetry, thus they can provide direct inputs for this ill-posed problem. This physics-based approach does not require additional input other than data acquired through the typical drone-based photogrammetric collection and was shown to favorably outperform existing approaches. We also demonstrate that the recovered albedo image can in turn improve typical image processing tasks in photogrammetry such as feature and dense matching, edge, and line extraction. [This work extends our prior work “A Novel Intrinsic Image Decomposition Method to Recover Albedo for Aerial Images in Photogrammetry Processing” in ISPRS Congress 2022]. The code will be made available at github.com/GDAOSU/albedo_aerial_photogrammetry

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来源期刊
ISPRS Journal of Photogrammetry and Remote Sensing
ISPRS Journal of Photogrammetry and Remote Sensing 工程技术-成像科学与照相技术
CiteScore
21.00
自引率
6.30%
发文量
273
审稿时长
40 days
期刊介绍: The ISPRS Journal of Photogrammetry and Remote Sensing (P&RS) serves as the official journal of the International Society for Photogrammetry and Remote Sensing (ISPRS). It acts as a platform for scientists and professionals worldwide who are involved in various disciplines that utilize photogrammetry, remote sensing, spatial information systems, computer vision, and related fields. The journal aims to facilitate communication and dissemination of advancements in these disciplines, while also acting as a comprehensive source of reference and archive. P&RS endeavors to publish high-quality, peer-reviewed research papers that are preferably original and have not been published before. These papers can cover scientific/research, technological development, or application/practical aspects. Additionally, the journal welcomes papers that are based on presentations from ISPRS meetings, as long as they are considered significant contributions to the aforementioned fields. In particular, P&RS encourages the submission of papers that are of broad scientific interest, showcase innovative applications (especially in emerging fields), have an interdisciplinary focus, discuss topics that have received limited attention in P&RS or related journals, or explore new directions in scientific or professional realms. It is preferred that theoretical papers include practical applications, while papers focusing on systems and applications should include a theoretical background.
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