Kochi, Nobuo
1.2.2 Stereo Image WorkStation PI-2000. Most importantly, this time we have developed PI-2000, which is a PC-
based digital plotter. This is the device, which is used to make three-dimensional measurement out of stereo images. It
is used when we want to obtain manual measurement — ; -
FERNE
of irregular complex surfaces which requires cubic Mene | Liquid Crystal Display
display, or when we want to process automatically a ER
large amount of three-dimensional data, which Main PCB
requires speedy processing. j E trace Contratti VULAM : 1028 x ien i Display Coni alind
PI-2000 has LSI for high-speed image processing for ORANGE CHE | TE Dr ish: -"- ciun X
handling a large amount of data (^- 1GB) and has Ade IMA pen a
large dual liquid- crystal-display monitors for cubical = ien
display (1024 X 768dot). It also packed the image- +
control-board into the display unit to make the system
smaller and lighter (See: Figure 1 center). Its software m
is based on Windows. (See: Figure 3 for the block SRM AAT
diagram of electric system).
Toage Control ES “CR
d'omtraliing
Clreudi
PI-2000 can handle the data of DI-1000, while the
three-dimensional data obtained by PI-2000 can be
fed back to and reprocessed by DI-1000 to produce
various image presentations. Figure 3. Block diagram of electric system
We have also developed a program of new automatic DTM (Stereo-matching). First we make TIN, using the points
measured by a surveying instrument and using the points on outline or irregular land surface obtained manually by
PI-2000. And then with this TIN data as initial value, we make stereo-matching. By combining this method with coarse-
to-fine-image-correlation we made it possible to obtain more accurate and speedy three-dimensional measurement.
As to the manual measuring, we have developed a new program of semi-automatic-image-correlation, which operates
simultaneously and correspondingly on both stereo-monitor and on PC display. With this new system, even the person,
who finds difficult to use stereo-monitor, can work with ease.
Besides, as another useful and important function of digital plotter PI-2000, it made much easier to check the
correctness of measurement by superimposing stereo-contour-line on stereo-monitor itself.
1.3 Measuring Flow
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4
First on the site of measuring, we set at least 6 targets on the object, if
possible. If, however, it is impossible we select at least 6 specific points on
Photograph
Next we take picture of the object by digital camera. If the stereo-analysis is
necessary, we take more than two pictures from different positions in such a | Inputting image data into PC |
en we take memory car t of the digital cam it into the Pen-
in i take memory card out of the digital camera and put it into t er Measurement (DLT)
omputer. (more than 6 for 1 image)
least 6 points with GPT. For this measurement we first confirm the
predetermined points on the computer display and aim GPT at the points and
The figure 4 demonstrates the flow of measuring. | Control points(target) setting |
the surface.
way that a certain portion of a picture overlaps with the other. 771
DI-1000, which now has camera data, displays its image and we measure at
ed
touch each of the points on the display. Then the GPT in this linkage actually d i Supplement
x upplemen
measures the object. s - Making ortho-image measurement
After GPT measurement we make TIN by DI-1000, which provides us the (if nec.)
frame on which to create various images we want. c
If we find the data are still insufficient, we can make supplement ETT formation/Editing |
measurement by simply commanding GPT the measurement of the point we —- L—
indicate. By multiplying such points we can make more accurate, detailed
and realistic measurement.
Having finished these works, we can bring back thedata to the office, Figure 4. Flow of measuring
where we produce and edit the images, and store them up in file or print them out.
| File output, printing output(printer, plotter) |
For off-line work, the image and measurement data, which are obtained at the site, are brought back to the office. There
the data undergo whole process of measurement, image production and editing.
If the speedy Tele-communication of large amount of data is possible, the measurement data obtained at the site can be
sent to the distant analyzing center.
436 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000.
