Teledyne EV71YC1MCL2010-BA0, Руководство пользователя, Страница: 34 / 59

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
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 ” <int> ;

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 ” <int> ;

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 <value>”

“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
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