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6 PerspectiveCorrectionforAnalogandDigitalPhotography
8
3
1
0,7
0,5
0,4
0,35
m
oo
5,6
114 16
2,8 22
22
4
8
4
816 16
22
53
2
1,5
1,25
Horizon
Too much
foreground
Optical axis
Building is true to scale
but cropped on top
8
3
1
0
,
7
0
,
5
0
,
4
0
,
3
5
m
o
o
5
,
6
1
1
4
1
6
2,
8
22
2
2
4
8
4
8
16
16
2
2
5
3
2
1
,
5
1
,
2
5
Horizon
Optical axis
Building not true to scale,
vertically compressed
Converging lines
≈ ¡3°
The equalizing of converging lines or of unfavorable perspective due to a
camera location made necessary by obstacles, reections or danger, eg
trafc, is not only interesting for conventional analog photography, but also
for digital photography when higher quality demands are made While digi-
tal images or digitized (scanned) analog images can be equalized on the
computer using image editing software such as Photoshop, this is, however,
associated with substantial degrading: If the rectangular image is distorted
in the manner of a trapezoid for the parallel alignment of the converging
lines, the interpolation (recalculation of the pixels) required for this reduc-