Redlake MASD MegaPlus 4.2i, Руководство пользователя

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REDLAKE MASD, INC.
3.8 Gain
The gain of the camera is variable in 2dB steps between 0dB and 24dB. The normal gain
position is 6dB. 0dB halves the gain, 12dB multiplies the gain by 2, 18dB multiplies the gain by 4
and 24dB multiplies the gain by 8. A change in gain of 6dB is the same as changing the lens
aperture by one f-stop.
As you increase the gain of the camera the noise in the picture will increase. By adjusting the
camera gain, the operator can optimize the signal to noise ratio and the sensitivity of the camera
for the application.
TYPE IN: RESPONSE EXPLANATION
GAE xx CR-LF Sets the gain control in 2dB increments. The range of
values is 0 to 24. Only even numbers are valid
GAE? Queries the current gain setting.
GAE xx Indicates that the gain is set to the value given in dB.
Sample commands with arguments:
GAE 0 Sets the camera gain to 0dB.
GAE 4 Sets the camera gain to 4dB.
GAE 24 Sets the camera gain to 24dB.
3.9 Black Level
The black level control functions much like the brightness control on a television set. To get
reasonable results under most circumstances, use the BKF or fixed black level. The fixed video
black level is set at the factory so that the output video is just above the black clipping level with
the lens capped. The black level can be varied over a range of plus or minus 50 percent of peak
white video. This adjustment range lets the user compensate for poor lighting.
TYPE IN: RESPONSE EXPLANATION
BKF CR-LF Sets the black level to an internal fixed value of
approximately 50 counts above zero for 10 bits or 12
for 8 bits.
BKE xxxx CR-LF Sets the black level as determined by the argument
with a range from –2048 to +2047.
BKE?
BKF
BKE xxxx Queries the current black level setting.
Means the black level is at the factory preset level.
Means black level externally set to the value
indicated.
COMMAND
APPROX. OUTPUT OFFSET
8-Bits 10-Bits
BKE -2048 -128 counts -512 counts
BKE 0 0 counts 0 counts
BKE 2047 +127 counts +511 counts
NOTE : The video will be clipped to 0 counts until it overcomes a negative offset. The video will
be offset towards white by a positive offset.
91000058-003 Revision A 3-6 10/01/01