JAI TM-2030GE, Руководство пользователя

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RM/TM-2030GE Series
18 Operation
3.3.1 Programmable Look-Up Table (LUT) and Knee Control
The TM-2030GE has a built-in LUT (look-up table) for dynamic range control.
At a specific gain setting, the offset (minimum level.... dark point) and A/D reference top voltage (maximum
level... saturation point) are set to 12-bit A/D input so that the full dynamic range of the CCD is utilized at 12-
bit references as the input and the LUT output is converted into either 8-bit or 10-bit to adjust the gamma
correction. There is no 12-bit LUT.
The look-up table has two knee points (variable gamma selection) that allow the 10-bit input to be segmented
into three regions. The look-up table selection can be made by knee curve direct input.
3.4 External Sync and Pixel Locking
The TM-2030GE accepts an external sync of standard HD and VD at TTL level for general locking to a system
sync and clock. The frequency requirement is as follows:
Full Progressive Scan:
fHD = 36.36 KHz ± 2%
fVD = 32.32 Hz ± 2%
(Internal Master clock = 80.00 MHz,
Pixel clock = 40.00 MHz)
3.5 Electronic Shutter
The TM-2030GE has a substrate drain-type shutter mechanism which provides a superb picture at various speeds
without smearing.
3.5.1 Programmable Exposure-Continuous Mode
The exposure time of TM/TMC-2030GE can be specified from one video line to a maximum of one frame using
the serial communication commands in the Continuous Mode. There is overhead where the specified exposure
time is n video lines, making the real exposure time equal to
In this mode the maximum exposure time is equal to the setting for one frame. If the user specified exposure
time is longer than the time allowed for one frame, it will be ignored by the camera.
3.5.2 Asynchronous No Shutter Mode
In Asynchronous No Shutter Mode, applying the external trigger starts a camera scan reset. The camera finishes
the line it is scanning and scans an additional 9 video lines, this charge is sent to the horizontal register.
Because the external trigger is randomly applied, the new image charge may overlap with the previous image.
To prevent an existing charge accumulation from interfering with a new image, most users set up the
application in a dark area and depend on a strobe light for illumination. From the time the external trigger
activates until the transfer gate turns off, about 9.5 video lines are available for integration; if everything is
properly configured, the strobe flashes during this time.