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Taking Photographs
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Mount onto Slide Projector
(Photo 1)
|
Digitize Reference Marks
Projective Transformation
|
Digitize Feature Points
(C1 to C6)
ERU
Mount onto Slide Projector
(Photo 2)
|
Digitize Reference Marks
Projective Transformation
)
Digitize Feature Points
(C1 to C6)
Space Intersection
!
Deformation Computation
!
Crush Analysis
Figure 4. The Operations of the Photogrammetric system
Image Capture
!
Digitize Feature Points
(C1 to C6)
|
Space Intersection
!
Deformation Computation
!
Crush Analysis
Figure 5. The Operations of the Video Based
Photogrametric System
THE SCANNING PROCESS
Using a scanner to convert graphic or image
information of analogue form into digital form is a well
established process. In mapping, scanners has been used
to assist the conversion of paper map into digital map. In
recent years, scanners have been widely applied for
preparing multi-media presentation materials. This
growing trend has induced massive progress in the
manufacturing field of desk-top scanners, from both
hardware and software aspects. These desk-top scanners
are designed for documentary use such as desk-top-
publication, electronic slide-show, etc. Compared with
the high precision scanner conventionally used for
mapping purposes, desk-top scanners have a significantly
lower price tag.
Based on the material which is designed for
scanning, there are two main categories of scanners. One
is for documents, such as paper prints, the other is
designed for digitizing slides.
