® 8k/4k CL
26
UM 8k/4k CL – REVA – 01/13
e2v semiconductors SAS 2013
•
Multi-Line Gain
(
MultiLineGain
) :
Enables the MultiLine Gain of x0,5 . This value is available in the CommCam
“Image Format Control” section :
Read function : “
r mlig
”;
Return by the sensor : “0” if disabled (Gain x1 by default); “1” if Gain x0,5 activated.
Write Function : “
w mlig
<value>”
“0” : Default Gain x1 is active.
“1” :
Gain x0,5 is enabled (only when the 2S mode of the sensor is enabled)
Why Using a Multi-Line Gain of x0,5 ?
•
Reverse Reading (X)
(
ReverseReading
) :
Allows to output the line in the Reverse-X direction. This value is
available in the CommCam “Image Format Control” section :
Read function : “
r revr
”;
Return by the Camera : 0 or 1 (enabled/disabled)
Write function : “
w revr
<value>”;
“0” : Disabled.
“1” :
Enables the reverse reading out (see below for “normal” direction)
When the Light source is enough to use
the “1S” mode of the Sensor (one single
line), the best is to use 2 lines (“2S”
mode) and then to divide the result by
two by using the Multi-Line Gain set at
“x0,5” :
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.
ADC
Memory Node
Pixel Line A
Pixel Line B
Pixel Line C
Pixel Line D
Memory Node
Web Direction
2S
1S
Exposure
delays
ADC
