Some Points for Improvement in Accuracy 
T? 
OT 
Ortho - contour Photography 
by Mitsuyosi Kureya 
INTRODUCTION, 
The preliminary experiment described in the report* in January, 1963 
was only to try to obtain the vague contours for simple objects. 
Therefore, the precision of the apparatus was very.low and the experi- 
ment was a rough work, and the discussion described before was a rough 
one too. 
Especially, the premier report showed only the possibility of the 
method by the principle descrived in the report. Since then, our object 
was to obtain the fine contours of an object and then we tried to 
change the mechanism, It was reported in Journal of the Japan Society 
of Photogrammetry, special volume No.l, this was printed to be Special 
Issue for the 10th International Congress of Photogrammetry at Lisbon, 
1964. In this report, we showed some attempt which is to be consider- 
ed in future. 
In this report, author will describe some points for Improvement in 
the accuracy of Ortho-contour Photography and some results from the 
experiments, but there are many difficult problems, therefore author is 
going on to do-the fundamental experiments to refine the aparatus and 
to solve the difficulties in this way. 
FUNDAMENTAL REQUISITION OF ORTHO-CONTOUR PHOTOGRAPHY 
= An Ortho-projective diagram of contours of ihe objeet has to be - 
obtained so that each contour has a constant magnification. 
2. The contour on a photographic plate must be fine. 
=. It would be quite convenient if this way can be applied to many 
kind of objects.