Seungjun Lee
ABSTRACT
When a physical object is scanned with an optical 3D scanner in a normal environment, shading is caused by external lighting that effect on the 3D scanned color data. This shading is not easy to separate from original surface color of the model and can make abnormal rendering result when rendered with additional artificial lighting. Therefore, various kind of automatic or manual processing is required to suppressing shading in general. However, the processing requires information of original scanned physical object and lighting environment which is not simple to sense and record. In our research, using white spherical plaster as a reference model, scan in lighting environment as similar as possible then make a model of external lighting environment using the normal vector and brightness information of the reference model to calibrate the color change due to shading. We have scanned experimental data and be applied processing to show feasibility of our method. We found that sphere or hemisphere reference model is effective reference model for process of suppressing shading. It is recommendable to end user application practice and can be included as component of standard or recommendation.
Supplemental Material
- Y. Shor and D. Lischinski, "The Shadow Meets the Mask: Pyramid-Based Shadow Removal"," Computer Graphics Forum, no. 27, pp. 577-586, 2008.Google Scholar
Cross Ref
- H. Hong and T. Whangbo, "A Study on texture mapping for the realistic representation of 3D digital heritage," in Proceedings of HCI Korea 2011, 2011.Google Scholar
- Z. Li, Z. Xu, R. Ramamoorthi, K. Sunkavalli and C. Manmohan, "Learning to reconstruct shape and spatially-varying reflectance from a single image," in ACM Transactions on Graphics (TOG), 2018.Google Scholar
- K. KIM, "Multi-view inverse rendering under arbitrary illumination and albedo," in European conference on computer vision, 2016.Google Scholar
- Y. YU and W. A. SMITH, "InverseRenderNet: Learning single image inverse rendering," in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2019.Google Scholar
- R. Basri and D. W. Jacobs, "Lambertian reflectance and linear subspaces," in IEEE Transactions on Pattern Analysis and Machine Intelligence, 2003.Google Scholar
- International Standard Organization, Graphic technology — Prepress digital data exchange — Part 2: Advanced colour targets for input scanner calibration, 2019.Google Scholar
Recommendations
Stylized rendering of 3D scanned real world environments
NPAR '04: Proceedings of the 3rd international symposium on Non-photorealistic animation and renderingThis paper presents an interactive non-photorealistic rendering (NPR) system that stylizes and renders outdoor scenes captured by 3D laser scanning. In order to deal with the large size, complexity and inherent incompleteness of data obtained from ...
When Specular Object Meets RGB-D Camera 3D Scanning: Color Image Plus Fragmented Depth Map
ISM '14: Proceedings of the 2014 IEEE International Symposium on Multimedia3D scanning is an important technology since one can apply the scanning results of objects to numerous 3D applications (e.g. Artwork sculpture preserving, 3D animation and 3D printing). However, 3D laser scanners are too expensive to be adopted in daily ...
A Theory of Refractive and Specular 3D Shape by Light-Path Triangulation
We investigate the feasibility of reconstructing an arbitrarily-shaped specular scene (refractive or mirror-like) from one or more viewpoints. By reducing shape recovery to the problem of reconstructing individual 3D light paths that cross the image ...
Comments