基於二維骨架之中國畫角色的動作變形

現今有許多的博物館及美術館會將古中國名畫製作成動畫，讓觀展者能有身臨其境之感，也能更了解當時的歷史背景。但是製作動畫並不容易，每一個角色都必須由專業動畫師來設計好每一幕的動作，這個過程需耗費大量的人力和時間。另一方面，因為中國畫的渲染效果，會導致角色物件的邊緣凹凸不平，這也會使得中國畫物件變形後的線條會有不連續的情況。因此我們設計了一個中國畫動畫生成的系統來改善以上提到的問題。我們的研究著重於採樣點(sample point)處理以及動畫生成兩個部分。採樣點處理的部分，我們利用一個新的佈點方法來保持物件線條的連接性，也透過計算採樣點和骨架之間的關係，並結合我們提出的權重方法來找出每一個採樣點的控制骨架。而在動畫生成的部分，利用我們根據中國畫的特性設計的變形方法來生成出動畫的關鍵格(key frame)，再利用內插方法生成中間格(in-between frame)。我們的系統也可以應用到多個角色以及多組骨架的動畫。

關鍵字

採樣點分配；中國畫；角色變形；二維角色動畫；採樣點分佈

並列摘要

Nowadays many Chinese-antique museums make famous Chinese paintings into animations to allow visitors to have feelings of actually being immersed in paintings. However, creating animations is not an easy work. First, it is laborious and time-consuming to construct each motion of animated characters. Second, Chinese paintings are drawn with ink on “Xuan” paper, which cause irregular dispersions, and these dispersions would lead to ragged borders of character, and strokes of Chinese painting character would be torn which lose the stroke line connectivity while implementing deformation. Therefore, we present an animating system to overcome these problems. In this thesis, we focus on two technical issues: sample point processing and animation generation. In sample point processing section, we put emphasis on sample point distribution and allocation which are the preprocessing of object deformation. We propose a point distribution method to preserve connectivity of stroke line of object and implement a weight scheme to decide control bone of individual sample points. Then our animation generation method includes two parts. First, we use skeleton-based deformation which is designed according to characteristics of Chinese paintings, to generate key frames through user-provided skeleton. Second, we use interpolation method to create smooth animations. Our system could apply to multiple-character and multiple-skeleton animations.

並列關鍵字

sample point distribution ； sample point allocation ； Chinese painting ； character deformation ； 2D character animation

參考文獻

[5] M. Yuan, X. Yang, S. Xiao and Z. Ren. 2007. GPU-based Rendering and Animation for Chinese Painting Cartoon. Graphics Interface 2007: 57-61.

[6] S. Xu, Y. Xu, S. B. Kang, D. H. Salesin, Y. Pan and H.Y. Shum. 2006. Animating Chinese Paintings through Stroke-Based Decomposition. ACM Transactions on Graphics 25(2): 239-267.

[7] M. Gleicher. 1998. Retargeting Motion to New Characters. Computer Graphics and Interactive Techniques 25: 33-42.

[8] C. Bregler, L. Loeb, E. Chuang and H. Deshpande. 2002. Turning to the Masters: Motion Capturing Cartoons. ACM Transactions on Graphics 21(3): 399-407.

[9] J. Pan and J. J. Zhang. 2011. Sketch-Based Skeleton-Driven 2D Animation and Motion Capture. Transactions on edutainment VI: 164-181.

國際替代計量

基於二維骨架之中國畫角色的動作變形

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