Parameters and Commands
Bonito Technical Manual
V2.2.1
36
Secondary starting address (B)
If the double ROI mode is active,
B
defines which line of the image sensor is
the first line of the second half of the output image. The sensor’s first (topmost)
line has the address
B=0
, the last line has the address
B=6BD
. The value of
B in conjunction with N and I is used to create the secondary region of interest
(ROI2).
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.
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]
>
•
Send the following serial command to record and apply new correction
data. The camera answers with a new prompt sign if the command has suc-
cessfully completed. The execution lasts for the duration of some images.
>
C=1[CR]
>
Note
For more information on double ROI mode see Chapter
Double
region of interest mode (D)
on page 37.
Note
Each image sensor line can only be read once per exposure.
Thus two ROIs are only possible as long as they do not share the
same line addresses.
Note
The correction data is volatile. So this command should be exe-
cuted at least once after switching-on for best performance.
