Crystal balls are generally considered as media to perform divination or fortune-telling. These imaginations are mainly from some fantasy films and fiction, in which an augur can see into the past, the present, or the future through a crystal ball. With the distinct impressions, crystal ball has revealed itself as a perfect interface for the users to access and to manipulate visual media in an intuitive, imaginative and playful manner. We developed an interactive visual display system named Magic Crystal Ball (MaC Ball). MaC Ball is a spherical display system, which allows the users to see a virtual object/scene appearing inside a transparent sphere, and to manipulate the displayed content with barehanded interactions. Interacting with MaC Ball makes the users feeling acting with magic power. With MaC Ball, user can manipulate the display with touch and hover interactions. For instance, the user waves hands above the ball, causing clouds blowing from bottom of the ball, or slides fingers on the ball to rotate the displayed object. In addition, the user can press single finger to select an object or to issue a button. MaC Ball takes advantages on the impressions of crystal balls, allowing the users acting with visual media following their imaginations. For applications, MaC Ball has high potential to be used for advertising and demonstration in museums, product launches, and other venues.
Abstract. We present a novel information hiding process that couples geometrical modeling with automated 3D fabrication for creating hiddenappearance reliefs. Our relief surface produces a first grayscale appearance visible by simple direct illumination and a second grayscale appearance ensured to be visible when the relief is lit by a digital projector with a specifically designed pattern and from a particular direction. The two appearances/images can be different yet embedded in the same physical relief. Since the second appearance appears only on demand, it could be used to hide a second image, a company logo, or a watermark image, for instance. Our novel method calculates a relief surface that maintains the properties needed for producing a second (hidden) appearance while also ensuring the first appearance is visible under normal direct illumination. Our experiments show that our method robustly produces reliefs with two arbitrary desired appearances.
This paper presents an interdisciplinary study on social science and computing technology to build a novel touring system toward representing the inner mood of place for the tourists. Ordinary touring systems are generally considering touring as introducing a place with descriptive information. Instead, the proposed system, Moodlog, brings "mood of place" into an ordinary touring scheme, opening up a new aspect of touring, leading to a deeper understanding of a place for tourists.This research introduces three design principles for Moodlog which are: (1) Place Regarded as Human, (2) Experiencing a Great Diversity of Place, and (3) Touring in Mood of Place. The basic idea of the work is we treating a place as a human being to communicate with the tourists. Specifically, Moodlog collects "mood of place" by information tagged by people living and travelling there. People have unique sense of place, which is able to contribute to the place by tagging their mood with digital media such as music, and photo and video taken there. This makes the place have its own mood, turning a passive place to be active as a human. Expressing the mood of place to a tourist's first visiting is just like the place being a human talking about its feeling and the stories it experienced to the tourist. Notably, the place is considered with multiple personalities because tourists have distinct feelings to the same place. Experiencing each personality of the place is just like talking to many people.For mood representation, music, color, photos, and videos are used to create a meaningful atmosphere for the user to easily get immersed in mood of place. Moodlog is implemented with a location-aware orientation-aware camera PDA held by the user during a tour. Additionally, a panorama-based user interface is introduced to help the user interact with the physical environment and the virtual memory of the place. A preliminary study for the system deploying in a university campus shows that the participants are interested in the new touring experience.
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