This paper presents a method for occlusion-free animation of geographical landmarks, and its application to a new type of car navigation system in which driving routes of interest are always visible. This is achieved by animating a nonperspective image where geographical landmarks such as mountain tops and roads are rendered as if they are seen from different viewpoints. The technical contribution of this paper lies in formulating the nonperspective terrain navigation as an inverse problem of continuously deforming a 3D terrain surface from the 2D screen arrangement of its associated geographical landmarks. The present approach provides a perceptually reasonable compromise between the navigation clarity and visual realism where the corresponding nonperspective view is fully augmented by assigning appropriate textures and shading effects to the terrain surface according to its geometry. An eye tracking experiment is conducted to prove that the present approach actually exhibits visually-pleasing navigation frames while users can clearly recognize the shape of the driving route without occlusion, together with the spatial configuration of geographical landmarks in its neighborhood.

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Recently, because the high-speed network system known as broadband intemet has become widespread,it is now possible to transmit various forms of multimedia data using this system. We found several research reports for the transmitting visual images in the network streaming process. However, there seemed to be few reports on transmission of holographic 3D movies. We present a transmitting process of holographic 3D movies adopting network-streaming techniques and a hologram in which 3D objects were recorded as fringe patterns. When we applied this method, we could achieve excellent transmission of holographic 3D movies. Moreover, we could reconstruct good holographic images using transmitted streaming data. From this result, it seemed possible to develop new transmitting processes of 3D moving data using well-known conventional techniques.With the aid of recent progress in LAN and intemet network systems, audio and visual datas have come to be transmitted with very high quality. In addition, a new broadcasting system[1] and a distant-leaming system[2] have rapidly been put to practical use. When the datas are accumulated beforehand by the server (on demand) , viewers and listeners are able to enjoy contents without any restriction of time and place. However, as for the transmission of 3D visual images of moving objects, there appears to be few reports asserting that the network streaming process can be extended to a transmitting technique and 3D visual images can be carried over the network using this method. In this paper, we study a transmitting technique for holographic 3D visual images ofmoving objects, and show that the network streaming technique can play an essential role in the transmission of holographic 3D visual images over the networks. The reasons why the holography is particularly studied here are the following: 1) In holography, the information describing 3D visual objects are processed into two dimensional fringe pattems, so that the modern transmitting system established for planar images can be effectively applied.2) Hologram is transformed into a highly redundant signals of 3D visual images, and thus, even if a certain deterioration occurs in quality of images in the transmitting system, the loss of information describing 3D visual images is considered to be small.In this experiment, a visual signal transmitting process is performed using the hologram obtained by computer aided composition by transforming it as a Real Media Form (based on MPEG-4),which is one of the techniques of Network streaming process. (on demand transmission) As this result, an excellent transmission of 3D visual images of moving objects is seen to be possible. Since broad-band internet system has now widespread among the general public, it seems to be possible for 3D visual images to be delivered to the general public over the network by applying this technique introduced above.2. Transmission of 3D visual images of moving objects using network streaming technique (1) Outline ofthe systemIn order to study the possibility of...

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