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Proceedings, XXth congress

ul 2004 International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV , Part B-YF. Istanbul 2004

Table 2. Results of line matching

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(a) Proposal method
(b) LSM method
(c) Probabilistic relaxation method
(d) Area correlation method

(a) LSM
| were
1e line
s. The
hese 3
are fj;
hese 3

Figure 4. Result of line matching by proposal method
(4) The line matching was performed efficiently by the above
procedures. However, these procedures can not apply for all
necessary lines due to fragment or multiple. Therefore, the
unmatched lines were corrected using epipolar matching.
The epipolar matching was performed using epipolar lines for
the first and last image. In order to estimate epipolar lines,
relative orientation was performed by coplanarity condition
using the first and last image. The both ends for the each
matched lines were used as pass points, and the orientation
int of parameters (9j, Kj, €», 9», K;) were determined. After the
orientation, geometric correction of the first and last image was

(b) Probabilistic relaxation

en performed using the orientation parameters. Consequently,
ded to epipolar lines were estimated.
of the Furthermore, in order to perform stereo matching using these
e third epipolar lines efficiently, stereo matching was performed by
above 3 general methods, and performances of each method
were compared. As a result, LSM method realized efficient
stereo matching more than other 2 methods which shown in
Table 3 and Figure 5. Consequently, LSM method was adopted
tching for the epipolar matching in this paper. (c) Area correlation
. gH Figure 5. Results of epipolar matching
igated, | Table 3. Results of epipolar matching
] with | 7. 3D MODELLING
ichine | 200000 | 020 2002020000000 | 0 o 000 cou acc eu 0se
could | iin idis emos dtes The line information for 3D modelling can be acquired
thods. Sect e eee Sas efficiently by the method in the previous chapter. However,
tensor | ao Sa maar its ure each rooftop of building in the urban area is needed to be
Figure | (a) LSM method recognized for 3D modelling. Therefore, rooftops recognition
| (b) Probabilistic relaxation method was performed by morphological opening procedure, and the
| (c) Area correlation method extracted rooftops were conjugated with the matched lines in
this paper (Kunii and Chikatsu, 2003). Figure 6 shows the result
of the opening procedure for the first image.
| 223