2004 International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B1. Istanbul 2004
e Calculates statistics for every camera image in real- shows a zoomed in detail of the antenna mast in the
time mode (minimum, maximum, average, median background The antenna was 2.3 kilometers from the camera.
and deviation).
e Allows to display image in different modes: RGB, R,
G, B and Gray scale.
e Performs gamma-correction for every camera image. Les pe
e Allows to adjust LUT for every color channel using
curves (curves can be saved and loaded for further
use).
e Supports different operation modes taking into
account color lag.
e Allows to adjust internal program parameters like
number of buffers and size of buffers manually.
e Provides different image saving options:
o Selecting cameras to write and cameras to
uuu
AX
ignore.
o Color &pth for every camera (8 … 14 bits
per channel).
o Color channel for every camera to save
(RGB, R, G, B, Gray scale).
o Image compression (lossless, lossy) — not
realized yet.
e — Reads and writes camera's registers using terminal.
e Contains settings window with simple hierarchical
structure to adjust most used board registers
(frequency, exposition, etc).
e . Saves received images to HDD applying image
correction and visualizes writing process.
e Automatically creates image map (for further
comfortable work with large raster files) and saves it
to HDD.
e — Automatically numerates output files, creates info-
files with all necessary information about images.
e Displays total size of saved image, free disk space,
writing time, etc.
DAS Viewer:
e Opens RAW-files of unlimited size, supports both Figure 6. Close-up of antenna
color and gray scale images with bit depth from 8 to
16 bits per channel.
e Uses image map for quick image navigation.
e Saves image fragments to RAW, BMP and TIFF
formats with various bit depth.
e Cuts images to fragments with defined size and
overlap.
! e Builds histogram of user-defined image fragment for
4. CONCLUSIONS
Directly acquired digital imagery is seeing widespread
acceptance in the photogrammetric community. The
combination of a wide field of view three line scanner and a
new, high performance stabilized platform appear to make the
= ety color channel : ; 3-DAS-1 an attractive system for large scale topographic
: e — Performs image correction (brightness, contrast, mapping, and associated tasks. Coming tests with aerial
gamma or curves) in 16-bits per channel mode. imagery over controlled target fields will be made to quantify
geopositioning performance.
DAS Photogrammetric Processing:
e LevelO to Level | conversion
e Channel pairwise rectification for stereo compilation 5. REFERENCES
and matching
e DEM generation 1. Gruen, A., Zhang, L., 2002. Sensor Modelling
e Ortho rectification for Aerial Mobile Mapping with Three-
Line Scanner (TLS) Imagery. ISPRS
Commission Il Symposium on Integrated
3. RESULTS System for Spatial Data Production, Xi'an, PRC
2. Hoffman, O., Nave' P., Ebner, H., 1982. DPS A
As mentioned the 3-DAS-1 is just about to acquire first aerial Digital Photogrammetric System for Producing
data. The following terrestrial image, Figure 5, was acquired Digital Elevation Models and Orthophotos by
from one channel out of a windo w in the laboratory. Figure 6 Means of Linear Array Scanner Imagery. Int.
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