e2v DIVIINA LM2, Руководство пользователя

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DIVIINA
®
LM2
16
0994G -Diviina LM2 04/11
e2v semiconductors SAS 2011
6.3.2 Setup
• Signal source
:
Defines if the data comes from the Sensor or the FPGA (test Pattern). This
command is available in the CommCam “Setup” section :
Ö
Read function : “ r srce ”;
Return by the camera: “0” if Source from the Sensor and “1” if test pattern active
Ö
Write function : “ w srce ” <value> :
ƒ
“0” to switch to CCD sensor image
ƒ
“1” to switch to Test Pattern.
The Test pattern is a single ramp. The test pattern is generated in the FPGA : It’s used to point out
any interface problem with the Frame Grabber.
The test pattern is a 8bit width pattern composed with several ramps from 0 to 255 all along the
whole Camera definition. Then the number of ramps depends on the number of pixels of the Camera
Test patterns are detailed in Appendix A.
•
Auto Tap Balance
:
Enables the Auto Tap balance. This command is available in the CommCam
“Setup” section :
Ö
Read function : “ r abal ”;
Return by the camera: “0” if Tap balance disabled and “1” if enabled
Ö
Write function : “ w abal ” <value> :
ƒ
“0” : Disable the auto Tap Balance
ƒ
“1” : Enable the Tap balance.
How works the Automatic Tap Balance ?
The Auto Tap Balance is a Laplace filter which is applied in the FPGA. It automatically solve any
odd/even mismatch that can be visible in the image
¾
Whatever the action you may have on the Odd/even Tap Gains to increase the mismatch
between the Taps, the filter will correct if enabled
¾
The filter has to be disabled if the inspection is done at Nyquist frequency : Then the tap
balance has to be performed by using odd and even Tap Gains.
The Camera is delivered with the Auto Tap Balance enabled by default.