E2v UNiiQA+ CL Monochrome User Manual - page 24
CL Monochrome
UM UNIIQA+ Monochrome CL
– RevA – 12/2014
Preamp Gain : (
GainAbs
with
GainSelector
=
AnalogAll
)
Set the Pre-amplification Gain. This command is available in the CommCam “Gain & Offset” section.
Read function (ASCII): “r pamp”;
Returned by the camera : Integer corresponding to one of the 3 different step values :
0 : x1 (0dB)
1 : x2 (6dB)
2 : x4 (12dB)
Write function (ASCII): “w pamp”
Gain
:
(
GainAbs
with
GainSelector
=
GainAll
)
Set the Amplification Gain. This command is available in the CommCam “Gain & Offset” section :
Read function (ASCII): “r gain”;
Returned by the camera : Value from 0 to 6193 corresponding to a Gain range of 0dB to +8dB calculated as
following : Gain(dB) = 20.log(1+ Gain/4096).
Write function (ASCII): “w gain”
Digital Gain (
GainAbs
with
GainSelector
=
DigitalAll
) : Set the global Digital Gain. This command is available
in the CommCam “Gain & Offset” section :
Read function (ASCII): “r gdig”;
Returned by the camera : Integer value from 0 to 255. The corresponding Gain is calculated as
20log(1+val/64) in dB
Write function (ASCII): “w gdig”
Digital Offset (
BlackLevelRaw
with
BlackLevelSelector
=
All
) : Set the global Digital Offset. This command is
available in the CommCam “Gain & Offset” section :
Read function (ASCII): “r offs”;
Returned by the camera : Value from –4096 to +4095 in LSB
Write function (ASCII): “w offs”
Multi-Column Gain
(
MultiGain
) :
Enables the Multi-Column Gain of x0,5 . Available only in the 10x10µm
pixels sizes (2048, 1024 and 512 pixels). This value is available in the CommCam “Image Format Control”
section :
Read function (ASCII): “r mclg”;
Return by the sensor : “0” if disabled (Gain x1 by default); “1” if Gain x0.5 activated.
Write Function (ASCII): “w mclg
“0” : Default Gain x1 is active.
“1” :
Gain x0.5 is enabled
Why Using a Multi-Column Gain of x0,5 ?
When the Pixel is 10x10µs, it is issued from a
binning of 4 Pixels 5x5µm.
The binning is made in two steps : a “TDI-Like”
Summation on the column before the ADC
conversion and then a Summation of the 2 columns
in the sensor.
This last summation can be done after a division
by 2 of each column value :
In this case, the Full Well capacity is multiplied by
x2 (two output registers are used) but the noise
divided by √2 therefore the SNR is improved by a
factor of √2.
Memory Node
Pixel Line A
Pixel Line B
Web
Direction
ADC
Col
1/2
Col
1/2
Col
+
This is the “High Dynamic” mode of the UNIIQA+