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Green Image
Issue No. 02 - February (2012 vol. 18)
ISSN: 1077-2626
pp: 177-187
Zhuwen Li , Zhejiang University, Hangzhou
Song Wang , Zhejiang University, Hangzhou
Jinhui Yu , Zhejiang University, Hangzhou
Kwan-Liu Ma , University of California-Davis, Davis
We present a two-level approach for height map estimation from single images, aiming at restoring brick and stone relief (BSR) from their rubbing images in a visually plausible manner. In our approach, the base relief of the low frequency component is estimated automatically with a partial differential equation (PDE)-based mesh deformation scheme. A few vertices near the central area of the object region are selected and assigned with heights estimated by an erosion-based contour map. These vertices together with object boundary vertices, boundary normals as well as the partial differential properties of the mesh are taken as constraints to deform the mesh by minimizing a least-squares error functional. The high frequency detail is estimated directly from rubbing images automatically or optionally with minimal interactive processing. The final height map for a restored BSR is obtained by blending height maps of the base relief and high frequency detail. We demonstrate that our method can not only successfully restore several BSR maps from their rubbing images, but also restore some relief-like surfaces from photographic images.
3D modeling, geometric constraints, restoration, relief, rubbing images, cultural heritage.

K. Ma, S. Wang, J. Yu and Z. Li, "Restoration of Brick and Stone Relief from Single Rubbing Images," in IEEE Transactions on Visualization & Computer Graphics, vol. 18, no. , pp. 177-187, 2011.
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