Isao Miyagawa 
model stand on the flat plane. However, this assumption cause the distortion of 3D shapes. 3D model reconstruction in REF. 
considering of gradient was very effective. 
Marti 
in VF 
Carlo 
the O 
Conr: 
IEEE 
Carlo 
Jianbx 
RYTT 
I.Miy 
with “ 
[.Miy 
Inform 
  
flat plane slope plane 
Figure 8: 3D Reconstruction on Delta Plane 
We also confirmed the effect by hybrid feature points in Figure 9. The hybrid method yields accurately shaped top surfaces 
of buildings. 
  
  
3D Shape without Hybrid Feature Points 3D Shape with Hybrid Feature Points 
Figure 9: Effect by Hybrid Feature Points 
6 CONCLUSION 
We investigated an acquisition and recovery method that processes hybrid feature points extracted from both high 
resolution and video images using the factorization method. The 3D object models were assumed to have N-point column 
shape, and were recovered on a plane formed from delta points corresponded to orthometric height data. Acquired and 
recovered 3D models were mapped on Tokyo Datum. Comparison experiments showed that the hybrid method was mor 
effective and accurate in acquiring and recovering 3D object shape than a earlier method. Moreover, we confirmed thi 
the hybrid method yielded accurately shaped top surfaces of building. We can expect the factorization method with hybrid 
feature points combining high-resolution images and Hi-Vision images to reconstruct 3D object shape more accurately. 
  
614 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000.