报告题目：中国传统文化遗产的计算机建模、修复与重构 (Modeling, Repairing and Reconstruction of Chinese Traditional Cultural Heritage)

报告时间：12月29日（周四）9:50

报  告 人：于金辉

报告地点：郁A102会议室

报告简介：

      This talk consists of two parts: the first part is about Restoration of Brick and Stone Relief from Single Rubbing Images. 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. 

The second part is about Computer Assisted Rendering of Thangka. Thangka is a unique art form of paintings in Buddhism, which is complex in composition, contains a variety of objects and intricate details. However, rendering of objects in Thangka is very tedious and time consuming. We present a computer assisted system for rendering Thangka. Our system adopts Poisson equation to generate the gray gradient of different objects. For object regions with gray values increasing/decreasing gradually from one side of the region to another, we assign images of black/white feature points as boundary constraints of Poisson equation semi-automatically by taking both occlusions and internal geometric features into account. These two kinds of images are adopted to solve the Poisson equation to obtain different gray gradient of different objects. We take Thangka line drawings as input and render them into colored Thangkas, with effects as demonstrated by three examples.

报告人简介：

      浙江大学教授，1999年在英国Glasgow大学计算机系获博士学位，自2001年起任职于浙江大学CAD&CG国家重点实验室，计算机应用技术与数字化艺术博士生导师。ACM SIGGRAPH会员，中国图像图形学会计算机动画与数字娱乐专业委员会委员，数码艺术专业委员会委员，中国动画学会会员，杭州国家动漫基地特聘专家。主要研究方向包括肖像风格化绘制、三维浮雕生成、图形复杂度建模、计算机辅助外科整形和中国传统艺术计算审美等。于教授1984年在国内首次利用微机为电教片《晶体管开关特性》制作动画，该片被当时中央电教馆收购。1995年受清华大学与广西科技出版社出版基金赞助出版《计算机动画原理与制作》专著1部。承担过国家自然科学基金项目4项，863高科技研究与发展项目2项，开发的技术在国内著名湖南三辰动画公司得到应用。基于汉画像拓片黑白图像恢复三维浮雕的研究成果应用于大学数字图书馆国际合作计划（CADAL）数字图书馆中。参与973子课题1项，国家自然科学基金重点项目1项，国家社会科学基金重大项目1项，国家科技支撑计划2项，承担省部级项目3项。在《ACM Trans. on Graphics》,《IEEE Trans on Visualization and Computer Graphics》, 《The Visual Computer》, 《Computer Animation & Virtual worlds》, 《Computers and Graphics》,《Journal of Computer Science and Technology》等国内外重要学术刊物和学术会议上发表论文70余篇。