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NEC Display Wall Calibrator system will automatically adjust multiple displays used
in a video wall so that the color characteristics closely match, thereby creating
the visual illusion of a single large display.
In order to accomplish this, the color characteristics of each display must be individually
measured and compared to all of the other displays in the video wall. The optimal
settings for each display can then be calculated so that all the displays will match
after calibration.
Since each display will vary in both color and intensity (brightness), due to aging,
individual components and tolerances, it is necessary to find the lowest common
denominator that all of the displays are capable of collectively achieving. In other
words, the video wall can only be as bright as the dimmest individual display.
The color characteristics of each display are measured using a color sensor, which
is connected via USB to a host PC. The sensor is placed on the screen and a series
of test patterns is generated and measured. This process is repeated for all displays.
The host PC does not have to supply any type of video signal to the displays in
the video wall, as test patterns are automatically generated within in each display.
Communications with each display from the host PC are performed via either RS232
or LAN (Ethernet).
Once all of the displays have been measured, the calibration Target can be calculated.
This Target defines the various calibration parameters such as the white point (color
of pure white on the screen), intensity (brightness), gamma, etc.
Each display is then calibrated to this Target setting by placing the color sensor
on the screen while the software adjusts the internal controls of the display. This
process is repeated for all displays.
When the calibration process is completed, all of the displays will match. The numerical
results of the calibration process can be viewed, and also the configuration settings
for each display and the entire project can be saved for future reference and use.
Once the connections to each display have been made and configured, the measurement
and calibration process typically takes between 3 to 6 minutes per display.
NEC Display Wall Calibrator is available on Apple Mac OS, and Microsoft Windows.
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Main Features and benefits
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Automatic calibration
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NEC Display Wall Calibrator communicates with the display monitors directly using
either RS232 or a LAN (Ethernet) connection. All adjustments to the display settings
are performed automatically using this communications link. It is not necessary
to manually configure the displays as all of the necessary settings are made by
the software.
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Internal Test Patterns
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Displays are calibrated using internally generated test patterns. This simplifies
the operation by allowing calibration to be performed automatically without having
to manually select different test patterns during the calibration process, and without
the need to connect a PC to the video input of the displays.
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10 bit internal Look Up Tables (LUTs)
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Each LCD display monitor supported by NEC Display Wall Calibrator features three
internal 10 bit LUTs. These tables allow very precise adjustments to be made to
the display’s Tone Response Curve without reducing the number of displayable colors
or introducing color banding artifacts.
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Gamma Correction
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As well as adjusting the Intensity (luminance) and white point of the displays,
the software will also calibrate the grayscale using the internal LUTs of the displays.
This means that highly accurate color can be achieved not only at 100% white, but
at all steps along the grayscale. A variety of different Tone Response Curves can
be applied also, from something as simple as a small simple gamma value to complex
custom curves.
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Flexible Connections
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Displays can be connected using RS232, LAN, or in combinations of both, to the host
PC used to perform the calibration. By using a wireless equipped host PC and LAN,
displays can be calibrated without making any physical connections to the host PC.
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Projects
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All display configurations, measurements, and calibration data can be saved as a
project file for later reference, re-calibration etc.
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Multiple Calibration Sets
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Different display monitor calibration projects can be uploaded to each group of
displays allowing quick and easy switching between different calibration settings
without the need to re-calibrate each display.
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Informative
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A Summary window shows the results of the calibration and the measurement data.
This allows for detailed logging and reporting of the calibration procedure.
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Flexible
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NEC Display Wall Calibrator provides many features and options that make it flexible
enough to be used in a large variety of video applications, including "on set" use
in TV studios and full DICOM support for medical imaging.
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Colorimeter function
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The software features a Colorimeter function which allows direct measurements to
be taken by the color sensor and the results displayed in a variety of different
formats.
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Scalable
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Video wall sizes from a 1x1 single display, to a 10x10 are supported.
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