5. RESTITUTION 
Once relative and absolute orientation is completed, 
restitution of the 3-D object lines follows. We measure 
points on a selected linear feature monoscopically both in 
the left and right image. The observation equations for the 
3-D restitution of the linear feature are given in equations 
(7) and (8), with the image parameters known from the 
orientation process. Following an argument similar to that 
of Chapter 4, we find that two points have to be measured 
monoscopically in both images of the line for its 3-D 
restitution. — Thus, in an automated system, the 3-D 
restitution of lines can take place as outlined in Chapter 2 
of this paper. 
6. CONCLUSION 
This paper gives some initial results on the topic of 
photogrammetric mensuration using homologous lines. 
This is of very great practical importance in automatic 
mensuration, as it allows the use of monoscopic 
measurements with no image correlation required. 
However, considerable research is still required in this field 
in order to convert this idea into a proven production 
method. 
REFERENCES 
American Society of Photogrammetry, 1980. ‘Manual of 
Photogrammetry’ Am. Soc. Photo-gramm., Falls Church, 
Va., USA. 
Kubik, K, 1991 "Relative and Absolute Orientation based on 
linear features’. ISPRS Journal of Photogrammetry and 
Remote Sensing, 46 (1991). 
Wylie, C.R. 1970 "Introduction to Projective Geometry, 
McGraw Hill. 
690 
1. 
In 
ent 
elir 
anc 
sel 
alw 
On 
in 1 
wav 
leas