A New Method to make Stereoscopic Animation and Their Application
Two SPOT panchromatic images of different dates at Mt. Minobu near Mt. Fuji in Japan were used as the input stereoscopic images. Figure 3 is the left image at Mt Minobu (Date: 1988.3.17, off-nadir angle: 15.4 deg. east). Figure 4 is the right image at the same place (Date: 1988.3.17, off-nadir angle: 4.1 deg.east). Figure 5 is the ortho-image made from these two input images. By using two input images, this method has the ability to reduce influence of off-nadir looking such as the shades of the opposite sides of the mountains in the output ortho-image. Figure 6 shows contour lines overlaid on the ortho-image. Figure 7 shows the output stereoscopic images which are the components of the output animation. The white rings in the images, which are overlaid as an example of map information, show the areas of nearly the same height.
Figure.3 The left image at Mt. Minobu
Figure.4 The right image at Mt. Minobu
Figure 5 The ortho-image made from the stereoscopic images
An experiment of lineament extraction form stereoscopic images
Two experiments were carried out to examine the relationship between the B/H ratio of stereoscopic images and the total amount of lineaments which can be extracted from the stereoscopic images. One was made at Izu peninsula, the other at Hisikari district in Japan. The lineaments were extracted by a specialist who is working for Sumitomt metal mining co., Ltd. Figure 8 shows the lineaments extracted from 4 pairs of different B/H ratio stereoscopic images of Izu peninsula (1). Figure 9 shows the lineaments extracted from 4 pairs of stereoscopic images of Hisikari district. From these figures, some principles can be extracted as follows.
(1) The greatest amount of lineaments were extracted from 0.5 B/H ratio stereoscopic images at Izu peninsula where the slopes of earth's surface were steep, but at Hisikari district where the slope were gentle, 1.0 B/H ratio stereoscopic images were the best. It can be said from this that the most suitable B/H ratio of stereoscopic images for finding many lineaments is different according to the steepness of the earth's surface.
(2) The lineaments which were extracted from 4 different B/H ratio stereoscopic images were slightly different. So, it can be said that different lineaments can be extracted from different B/H ratio stereoscopic images.
Figure.6 Contour lines overlaid on the ortho-image
Figure.7 Component sterepscopic images of the output stereoscopic animatior.
Figure.8 Results of lineament extraction from 4 different B/H ratio stereoscopic images of Izu peninsula
Figure.9 Results of lineament extraction from 4 different B/H ratio stereoscopic images of Hisikari district
