A New Method to make Stereoscopic Animation and Their Application
Nobuhiko Mori
Osaka Institute of Technology
1-79-1, Kitayama, Hirakata-Shi, Osaka, 573-0196, Japan
Tel: (81)-720-66-5390 , Fax: (81)-720-66-8380
E-mail: nmori@ij.oit.ac.jp
Abstract
A new method for making a stereoscopic animation has been developed, which has an ability to make a stereoscopic animation from stereoscopic images directly and easily. On the other hand, it has been shown from experiments that it is necessary to use many different base-height ratio (B/H ratio) stereoscopic images to extract the greatest amount of linear features (lineaments), which are important to find new mineral veins. A new type of stereoscopic animation called stereoscopic animation of rising mountains, has been proposed here for application to lineament extraction. In the animation, the mountains as virtual images rise slowly the B/H ratio of the component stereoscopic image gradually; and can be used effectively in lineament extraction work.
Introduction
3-dimensional (3-D) animation of landscape are often made to show the shape of the earth's surface realistically. Ortho-images and appropriate interval digital elevation models (DEMs) of the subject area are necessary to make such 3-D animations, but it is not easy to make these data.
For 3-D animation, bird's eye view animations are very often used because they require no special display device. But stereoscopic animation are more effective for special work which requires detailed topographic information of the earth's surface, such as designing of area development or route selection of roads. In this case, a 3-D display device is necessary to see the stereoscopic animations. For some design purposes, fast motion of stereoscopic animation is not necessary. Slow motion or step motion of stereoscopic animation is sometimes more suitable.
A new method to make Stereoscopic animation
Stereoscopic animations of landscape, which are not used now, are usually made using a method as shown in figure 1. In the figure, an ortho-image is made using an image and a DEM, and overlaid by maps if required. Then, an output stereoscopic animation is made using the overlaid ortho-image and DEM. Because the scale and projection method of input images and DEMs are usually different, it is difficult to make stereoscopic animation by using this method. But now, a new method for making ortho-images has been found which extracts both an ortho-image and a DEM from the same stereoscopic image at the same time
Figure 1 The usual method to make stereoscopic animations
Figure 2 A new method to make stereoscopic animations
Using this method, the new method for making stereoscopic animation has been developed, which is shown in figure 2. With this method, stereoscopic animation can be made from stereoscopic images directly, and the work is simplified very much.
This new method of making a stereoscopic animation from stereoscopic images can be realized on a digital photogrammetric system. In this research, a pc- based digital photogrammetric system with 3-D display has been used. One example of making output stereoscopic images which are one component of an output stereoscopic animation, form input stereoscopic images will be shown next.
