Description of the data path
GUPPY Technical Manual
V4.0.1
80
The table below illustrates the advanced auto gain control register.
Setting the brightness (black level or offset)
It is possible to set the black level in the camera within the following ranges:
CCD models
: 0...+16 gray values (@ 8 bit)
Increments are in 1/16 LSB (@ 8 bit)
Board level versions: Increments are in 1/64 LSB (@ 8 bit)
CCD models
: The formula for gain and offset setting is: Y`= G x Y+Offset
CMOS models
: -127 .. 127 gray values
Increments are in 8/25 LSB
The IIDC register brightness at offset 800h is used for this purpose.
The following table shows the BRIGHTNESS register.
Register
Name
Field
Bit
Description
0xF1000370
AUTOGAIN_CTRL
Presence_Inq
[0]
Indicates presence of this feature
(read only)
[1..3]
-
MAXVALUE
Max Value
[4..15]
Max value
-
[16..19] -
MINVALUE
Min value
[20..31] Min value
Table 25: Advanced register for auto gain control
Note
L
•
Values can only be changed within the limits of gain
CSR.
•
Changes in auto exposure register only have an effect
when auto gain is active.
•
Auto exposure limits are 50..205.
Note
L
•
Setting the gain does not change the offset (black
value) for CCD models.