2. STEREO MATCHING PROCEDURES 
Step 1: detection of peak signals 
After smoothing and threshholding to 0 or 1 signal, peak 
signals are detected which correspond to illuminated grid points. 
Step 2: identification of address 
From the 8 bits signals, each address is identified at 
the above peak point. 
Step 3: address matching 
Each address of CCD 1 is compared with addresses of CCD 2 
to find out the coincident address, which gives the conjugate 
point. In case of invisible or hidden point, any address can not 
be matched. Then no computation for point determination is made. 
Step 4: computation of coodinates 
From a pair of conjugate, points, X and 4 coordinates are 
computed. Correction for lens distortion with 7th order 
polynomials is also done simultaneously. 
Step 5: graphic output 
Sections or contour lines are output in a nonitor or by a 
printer. 
Fig.4 shows an example of output on a monitor. 
* 
. scen line ze, 
. match point ; ( 2947 ) 
*. miss point ; ( 363) . 
Te 
= 
TN ‘ SOSA AERA RO Met 
à URDPH-COPY ; YES - (D = 
1 10 20 1 X 
40 
ttd tcs mt zz zz! 
  
Fig.4 Computer output by the automated measurement 
169