DEVELOPMENT OF A CCD CAMERA 
BASED CLOSE RANGE PHOTOGRAMMETRIC SYSTEM 
Shunji Murai, 
Institute of Industrial Science 
University of Tokyo 
7-22, Roppongi, Minatoku, Tokyo, Japan 
Fumio Otomo and Hitoshi Ohtani 
R&D Division, TOPCON Co. 
75-1, Hasunuma, Itabashi, Tokyo, Japan 
ABSTRACT 
A stereo CCD camera system connected with a Japanese micro 
computer has been developed for close range photogrammetry by the 
authors. The system is composed of two cameras with a linear array 
of CCD elements of 2048 respectively which are located on the 
parallel guide rail to permit stereo photography line by line. 
Digital image data with illuminated grid pattern are 
transfered to a micro computer ( NEC PC-9801 ) to proceed to an 
automated three dimensional measurement by the auto-address 
matching. 
Though the system is still an experiment stage, the result 
showed a possibility of automated three dimensional measurement 
in a near real time. 
INTRODUCTION 
A CCD camera can be a new photogrammetric tool for three 
dimensional determination in real time without using film. 
In order to achieve a low cost but highly accurate 
photogrammetric system, the authors introduced a personal 
computer for automated stereo matching and determination of three 
dimensional point. 
For a practical purpose the conventional image correlation 
to maximize correlation coefficient for n x n stereo image data, 
is not fully reliable because of maily the following two reasons. 
One is the difficulty to detect whether a determined 
conjugate point is correct or not. The other is the difficulty to 
detect invisible or hidden point. 
In this study a special pattern generator with 8 bits 
addresses was developed to remove these difficulties. The 
conventional correlation method was replaced by an address 
matching. 
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