手指人偶: 基於手指走路的人形虛擬化身操作

Abstract

利用表演達成虛擬操偶的模式已經被廣泛運用在多種不同領域上，包含但不限於遊戲、故事敘述、動畫編輯。人類靈巧的手可以做出非常豐富的動作，正因如此它適合作為操作虛擬角色的介面。我們採用” 手指走路” 這種直覺且自然的表演方式，用來作為操作虛擬人型角色的介面。首先，我們利用初步的使用者訪談，藉此得到大多數一般的使用者對於” 手指走路” 的認知範圍。並且，將這些收集到的” 手指走路” 動作分成不同動作類別。最後，從一個廣泛被使用的動畫資料庫當中，挑選出5 個多數受訪者認同適合使用” 手指走路” 表達的虛擬角色動畫為範例動畫。我們提出的虛擬角色操作方法，它會透過轉換” 手指走路” 過程中的旋轉角度變化到虛擬角色的雙腿達成動作轉移。接著，從範例動畫當中尋找相似的腿部動作用於全身的姿態重建。我們也實作一個互動故事敘述應用程式，藉此展示我們提出的方法有能力產生富有回饋感與可靠的虛擬人型角色動作。

Performance-based digital puppetry has gained widespread popularity in various fields, including gaming, storytelling, animation editing, etc. With their dexterity and ability to perform various movements, human hands are well-suited for manipulating digital avatars. In this study, we adopted the finger-walking technique, a natural and intuitive method of performance, as an interface for controlling human avatars. We first conducted a preliminary study to explore the range of finger-walking movements preferred by casual users and identified several general types of finger-walking performances. Based on the study results, we selected five common example animations from a database that are suitable for finger-walking performance. To manipulate the human avatars, we developed a method that maps finger-walking motions to leg motions using rotation mapping and matches similar leg motions in the example animations to generate expressive full-body motions. We also implemented a prototype interactive storytelling application to demonstrate the effectiveness of our system in generating responsive and reliable human avatar motions.