近年隨著新技術研發，人們與數位資訊互動已不再侷限於傳統的滑鼠鍵盤。諸多相關研究理論紛紛提出，認為科技和電腦應該從使用者的角度出發，讓人在使用過程中不受限於工具，得到流暢的互動經驗。資訊科技應提供更自然的界面，並形成一道橋梁，促進人與人之間的溝通合作。為此新的互動方式不斷地被提出，例如自然使用者介面(Natural User Interface, NUI)便以接近人的自然行為操作為目標，希望讓人們能以較直覺的方式來與電腦進行互動。其中具備可同時輸入多點之特性，並能支援多人互動的多點觸控 (Multi-Touch)，更是促使人機互動(Human-Computer Interaction, HCI)在使用者介面和操作模式上產生巨大變革。

多點觸控的興起促使相關研究相繼投入此一領域。然而多點觸控的人機介面革命才正要開始，創新實用的介面設計和直覺自然的手勢定義仍有待探索開發；使用者研究也多限於實驗室環境測試，針對人們在公共空間中使用多點觸控螢幕之觀察研究相對較缺乏。以公共多點觸控互動介面應用來說，博物館或展場等公共空間是個新機會點。藉由多點觸控與大型公共顯示器結合，提供多人同時互動的能力，讓大眾能用雙手輕鬆自然操作，自互動中創造新經驗與學習。

本研究在公共空間中實際架設一面能支援多人同時觸摸操作的100吋大型多點觸控互動牆∞Touch，開發使用“DIG”手勢進行操作的新型態多點觸控相片展示介面Photo.DIG。透過多點觸控平台的實作開發及舉辦公開性展覽，讓成果走出實驗室，使社會人群也能自由參觀並實際操作體驗新互動介面。並於展覽期間進行田野測試(Field Trial)，建構場域攝影系統進行錄影觀察並佐以現場觀察，從中對本多點觸控介面系統進行評估，整理分析人們在真實公共展覽空間中，面對新型態多點觸控圖像展示介面所產生的操作行為模式、互動情形及相關議題，發掘多點觸控介面更多的可能性。研究中提出公共展示空間中多點觸控螢幕牆互動狀態五階段，並觀察到人們在公共空間中面對大型多點觸控牆時會產生豐富多變的手勢與操作行為，也常在操作者和使用者間不停切換，並出現垂直和水平空間上的平行使用與輪流使用。此外人們會產生合作操作與幫助他人、遊戲、表演等行為，也會受週遭觀眾影響而改變舉動。人們在操作過程也會受領域感影響，試圖宣示照片所有權、掌握操作主導權或出現指揮行為，甚至產生衝突處理。人們會透過多種不同的學習模式來探索多點觸控介面的操作，並對展示內容進行討論和回憶，不同人們在照片展示內容與觸碰操作體驗間也會有不同的專注力分配。希望藉著使用者觀察來了解更多關於人們在使用大型開放式多點觸控螢幕時的考量與需求，提供日後相關研究與應用的參考，讓未來的科技更加回歸人性面。

As computers become pervasive in our daily life, researchers bring up the idea that technologies and computers should offer friendly interfaces for their users, and become the bridge between people and digital information. Natural user interface, such as Multi-touch, is the most popular topic in Human-Computer Interface today. Multi-touch can not only give us the ability to use more fingers simultaneously to interact with the objects on the screen without traditional input devices, such as physical mouse or keyboard, but also provide the possibility of multi-user interaction. These characteristics of Multi-touch blur the line between physical and virtual worlds, and lead the concepts of Human-Computer Interaction to a great revolution.The rise of Multi-Touch technology enables new ways of interacting with information. The developments of Intuitive gestures and innovative interfaces are still ongoing. The generality of user studies on Multi-Touch display are in laboratory settings, in other words, less focus on public Multi-Touch display. Multi-Touch has the potential to be applied in museums and exhibits because it can support fluid interactions, and allow multiple users to interact with exhibition's contents through rich and various gestures simply created by their fingers or hands on the screen simultaneously.

This study wants to explore the possibility of the multi-touch interface, and to observe what kind of behavior and interaction will occur when people face a new form of interface in a public space. To reach the aim, this paper presents a 100-inch vertical multi-touch wall display“∞Touch” in NCKU Art Corridor, and a multi-touch photo application“Photo.DIG” which is inspired by the natural gesture “DIG”. In addition, this study holds an exhibit of historical photos of NCKU, and then does field trial using video observation and on-site interview. Finally, analyzes the data from the field trial and conclude the findings. To find some considerations and requirements of people who use a large multi-touch public display, which can be used in more related researches and applications in the future.

This paper presents the framework for five interaction phases of public Multi-touch wall: Pedestrian, Visitor, Audience, User and Operator. When people face a large Multi-touch wall in public space, there is some general behavior: (1) Rich and various gestures and behavior. (2) Parallel Use in vertical or horizontal space and Turn-Taking. (3) Cooperation and help behavior. (4) Performance and the influence of audience. (5) Playful games and competitions. (6) The sense of territoriality. (7) The ownership of objects, the leading role and director. (8) Conflict management. (9) The switch between Operator and User. (10) Different ways of learning. (11) Discussion and reminiscence of photos. (12) Exhibition content and Multi-touch experience.

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