lig- 
e 
ich 
er 
Lon 
use 
y 
id 
1 of 
ad 
eral 
X 
iere 
‘he 
188), 
32), 
an 
ave 
LON 
the 
  
workstations, are sold on the market. As a 
merit of these systems, system development is 
relatively easy because the image correlation 
method is simple in terms of processing proce- 
dures and strong against noise, and therefore, 
it is possible to compile the data with high 
accuracy to-a certain extent. Also, it is pos- 
sible to efficiently generate high quality DTM 
by utilizing the techniques such as image py- 
ramid, etc. Furthermore, the system with which 
operability 1s considered in its design is 
likely to be developed soon. 
As the issues yet to be solved at present, the 
image correlation method hasa limitation in 
case of topography and objects with intensive 
relief and a difficulty in processing of aerial 
photograph of large scale. To cope with these 
problems, many methods have been tried to the 
stereo matching such as edge matching method 
and area matching method, but they are not com- 
pleted yet as a practical system. Also, the 
system as a whole is still complex and highly 
prices as the development is made mainly on the 
Workstations, and therefore, we can hardly say 
that they are easy-to-use processing systems. 
à. Development of Semi-Automatic System Based 
on Personal Computer 
Based on the recognition of the present state 
stated above, we developed the Personal Digital 
Photogrammetric System "PyramidStereon." This 
is a system activated on a personal computer 
Which has shown dramatic advancement in terms 
of function; the system was developed for the 
purpose to establish a technique to easily com- 
pile DTM and digital orthoimage. We employed 
semi-automatic method to the portions which are 
difficult to automatize.  Fig.l shows the hard- 
Ware configuration, and Fig.2 the software con- 
figuration. 
  
  
  
  
  
- PyramidStereon — — — — ——4À 
Data Image 3-D mesh 
processing disp/edit | compilation 
MS-Windows 3. 1 
MS-DOS 6. 2/V 
  
  
  
  
  
Fig.2: Software configuration of "PyramidStereon" 
The software composing of this system is activ- 
ated by basic softwares of MS-DOS 6.2/V and MS- 
Windows 3.1. The majority of the software is oc- 
cupied by "data processing group." In addition, 
photo-retouch software PHOTOSHOP 2.5 made by 
Adobe Systems Inc. as an "Image display/editing 
group and 3-D mesh compilation software SURFER 
made by Golden Software Inc. as a ”3-D mesh 
compilation group” are used in combination. The 
processing procedures of this system is shown 
in the flow chart of Fig. 3. 
Input by scanner 
| 
v 
Inner/Relative/Absolute orientation 
| 
V 
Rectification 
  
Compilation of image pyramid 
  
Stereo matching 
V 
Edition and correction 
  
Re-organization of mesh 
  
Output as DTM 
| 
V 
Compilation of digital orthoimage 
  
Fig.3: Processing procedures of 
"PyramidStereon" 
  
  
  
  
CD IBM PC/AT compatible PC 
(Pentium 60MHz, Mem:32MB, Dsk:2.5GB) 
@ Crystal EYES PC 
by StereoGraphics Corp. 
(39 Genascan DT-S10304AI 
by Dainippon Screen Ltd. 
Fig.1: Hardware configuration of "PyramidStereon" 
289 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996