DSW700 System Description
Host computer and software
1. Host computer The DSW700 requires a host with dual processors running the Windows®
XP Professional operating system. The requirement is:
Workstation PC such as the HP XW8400
• Two Dual-Core Intel Xeon processors, 2.33 Ghz minimum
• 4 GB RAM
• 250 GB SATA hard drive (minimum)
• DVD±RW drive recommended
• Graphics card must be a PCIe graphics card with minimum resolution of 24-bit,
1152x900 and 256MB memory
• Quality color display, capable of being calibrated (must be capable of adjusting color
temperature to 6500K as well as offer three gain and three bias sliders
corresponding to the Red, Green and Blue channels) is desirable.
• Operating system: Windows XP Professional (SP2) 32-bit
• Serial line PCI slot card offering additional serial port connections
• This is required since the HP xw8400 only includes one built in serial port and
two are needed; one for the LED strobe control and another for stage motion
communication. Details on the recommended card are below:
Manufacturer - Digi
Model - 2-port EIA-232 Universal PCI Serial card
Manufacturer Part Number - 77000847
• Other forms of storage, for example optical disk, DAT or DLT, may be chosen as
options or the SATA drive capacity may be expanded.
2. Operating system, user interface and application environment The PC operating system
must be Windows XP Professional with Service Pack 2. The application software consists of
the Leica SCAN, Image Utilities and FastDodge products. The software is GUI-based and
promotes a consistent “point and select” operation in all functionality.
3. Stage calibration A calibrated grid plate, supplied with the system, is utilized to determine a
table of corrections to be applied in real-time to the stage coordinates to achieve the final
stage positioning accuracy of the system. It proceeds automatically once the operator has
manually pointed to the first grid intersection. The grid intersections, spaced at 15 mm
intervals, are driven to and measured automatically, using the correlator mode of operation to
point precisely to each grid intersection. When all grid intersections have been measured, a
table of corrections is computed. Finally, the precision estimates for the unit are calculated by
scanning the glass grid, measuring the intersections in the scanned image and comparing
them to the corrections built.
4. Sensor calibration This function performs both a geometric and a radiometric calibration of
the sensor. For the geometric calibration, a calibration grid is used to determine the actual
optical pixel size (the X and Y pixel dimensions are measured independently). A
transformation is developed between the sensor and the stage coordinate system at 25
distinct points to model the path of light as it passes through the film, glass, and lens and
ultimately strikes the sensor. The radiometric calibration uses four-color image patches and
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