chromasens allPIXA, Руководство пользователя

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CD40047_R04_allPIXA_User-Manual.docx 134
Usage: If the current gaining values are higher than about 200, the Analog coarse gain
amplifier may be used (set to a higher amplification factor) to decrease gain values.
Otherwise, the image pixel noise increases.
It is recommended to operate the camera with current gaining values in a range from
80
– 200 for best image quality by using the
Analog coarse gain function to pre-
adjust the actual gain range
Note: If the output signal of the CCD is higher than the possible input signal of the AFE,
this might cause “saturation” in the image lower than 255. Therefore analog coarse
gain has to be set to
– 3 dB.
Current camera gain values
This parameter describes the analog gaining parameter of the camera which takes effect in step
(2) of analog image processing (
section 4.6.1 ,
“Figure 9: Analog process of the allPIXA camera
(block diagram)
”).
With active white control, this parameter refers to the gain values labeled with (3) in the diagram
of section
4.10 .
Name
Name
Current camera gain values
Function
Gaining values for the analog gaining of the camera.
Channels Red, Green, Blue;Odd; Even; Front; Rear
Unit Integer
Log.
Dependency
None
Notes
One step of this parameter refers to 0.0359 dB,
27.85 steps refer to 1 dB.
By increasing up to 168 steps, it doubles the signal.
Camera: Value:
Lower limit all 0
Upper limit
all 700
Camera startup gain values
Name
Name Camera start gain values
Function
In accordance with these values, the gaining values are updated at startup of the
camera or if a setting is loaded for faster startup behavior of the closed-loop
control for white balancing.
Channels
Red, Green, Blue; Odd; Even; Front; Rear
Unit
Integer
Linear
Dependency None
Notes
Camera: Value:
Lower limit All
0
Upper limit All 700