le 
nt 
  
S: 
- > 4 
SS 
e. 
R200 rugs h MÓN 
4 i SAL, 
2 
{ 
mate es - J 
E+ 9050:0 +» 50:0 4%, Ko 7 — 
LE - He — = 
ds 
  
  
  
  
  
ddnde odd 
4 rrr ree err et 
| | 
| 
| | 
X Xi 
Pig.22. 
And the abscissa of the slit gives the X - coordinate of the aimed point 
on the contour. If the drum has done one rotation while they(slit and 
drum) are carried by 4 x,, the X - coordinate of some points projected 
through the slit and the camera lens is given by x, . Thon the Current 
in the photo-transistor gives the signal. Ry this signal, which must be 
selected, we can know the ordinate of the intersection P as shown in 
Fig.20 
REFERENCES. 
* Kenzo Toishi and Mitsuyosi Kureya: Ortho-contour Photography. 
Photogrammetric Engineering, XXIX(1963),No.1, pp. 206 - 210 
** Kenzo Toishi and Mitsuyosi Kureya: Improvements of Ortho-contour 
Photography. Journal of Japan Society of Photogrammetry, Special 
Volume No.1 (1964), pp. 29 - 34 
*** Mitsuyosi Kureya: Some points for Improvement in accuracy of Ortho- 
contuur Photography. Journal of the Japan Society of Photogrammetry, 
No.5 (1967), pp.8 - 15.