photograph. This filter contains frequency and phase
of the imagery in x as a function of its y position.
After the filter is made, it is repositioned in the
Fourier transform plane and the second stereo photo-
graph placed in the input, the situation depicted in
Figure 5. A scanning slit a few hundred microns wide
is placed in front of the second stereo photograph to
select a y strip of the photograph. For any position of
the slit within the overlapping imagery, the correlator
output displays the x parallax as a function of y
photocoordinate as shown in equation (12).
Representative experimental results obtained with
the mechanical model are shown in Figure 8. The
straight horizontal line is generated by the reference
beam and serves as a convenient datum line. The
vertical dark strip in the center of the figures is
caused by lack of contrast over most of the meter
stick. The dark shadows at either side of the hemi-
sphere result from bad imagery due to the 90-degree
slope. All three curves in Figure 8 were obtained from
a teesanqu
=
Figure 6 Experimental One-Dimensional Coherent
Optical Image/Matched-Filter Correlator
the same filter. SUMI
Results obtained using 1:140,000 scale aerial
photography, Figure 9, are shown in Figure 10. The T
two plots of Figure 10 were made from two different | abov
filters. of t
The results shown in Figure 10 are considered disp!
significant since they were obtained directly from phot
70-mm aerial diapositive plates. It is worth noting | latio
that the clearing of y parallax is checked by making a | gooc
slight movement in y of either the filter or the photo- extr
graph and observing that the correlator output | syste
disappears simultaneously in all image channels. | and
The profiles in Figures 8 and 10 are the direct subj:
output of the correlator and hence appear in photo- | does
coordinates; additional processing is required to ob- | tion.
tain model coordinate information. | COIT:
Figure 7 Three-Dimensional Model e - tech
Figure 8 Instant Profiles—Laboratory Photography |
KRULIKOSKI, KOWALSKI, AND WHITEHEAD
64 OSKI. PAR
