Bonito Technical Manual
V2.4.0
40
Parameters and commands
Secondary starting address (B)
The value of parameter
B
is used to create the secondary region of interest
(ROI2).
If the double ROI mode is active,
B
defines the line of the image sensor that is
the first line of the second half of the output image.
Range
From
0
(topmost line) to
6BD
(lowermost line)
Default
0
Related
Parameters
A
,
B
,
D
,
N
and
I
Example
A=F
start first AOI at the 16th line
B=1F
(0x1F = 31), starts second AOI at the 32nd line
D=1
enable double ROI mode
N=F
read 16 lines from each ROI, 32 lines in the output image
I=1
read every line
Fixed pattern noise (FPN) correction (C)
The
Bonito
camera provides an FPN correction to improve image quality. Correc-
tion data has to be recorded under low-light conditions. For best correction
quality new correction data should be acquired from time to time.
Range
0
, 1, or 3 (value 3 is write-only, will be read as 1)
Default
0
Related
Parameter
M
Example
To acquire new FPN correction data follow this sequence:
•
Try to eliminate bright light sources, e.g. switch them off if possible. For
best correction quality, close the iris or use a lens cover.
•
Ensure that the camera continuously outputs images at a constant frame
rate, e.g. using the continuous mode:
>M=0[CR]
>
Note
For more information on double ROI mode and a diagram dis-
playing the ROI parameters, see chapter
Each image sensor line can only be read once per exposure. Two
ROIs are only possible as long as they do not share the same
line addresses.
