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CV-A33CL
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6.1.6. Window of Interest
If a higher frame rate is wanted, it is possible to change
the CMOS sensors sensing area to the window of
interest. WS =1 for windows scan.
Window of
interest
X,Y
0,0
WX
WY
WW
WH
FVAL
LVAL
DVAL
Window of
interest
X,Y
0,0
WX
WY
WW
WH
FVAL
LVAL
DVAL
The X,Y start coordinate, the window width and height
can be programmed.
WX can be in the range 0 to 657
WY can be in the range 0 to 490
WW can be in the range 2 to 659. (WX + WW ≤ 659)
WH can be in the range 3 to 493. (WY + WH ≤ 493)
The frame rate will not increase if the width WW is
reduced. The horizontal shift register need to be read
out in its full length.
Minimum size for the window of interest is 2 (h) x 3 (v)
pixels.
Maxim frame rate is 4953 fps.
For DVAL timing details for the window of interest,
refer to 6.2.5 fig. 17 through 19.
Fig. 12. Windows of Interest
6.1.7. Auto Trigger Window of Interest.
The auto trigger function, TR=3 can be used as sensing device inside the camera field of view.
The scanned area is from top of the image, and the height can be programmed with the
command AT= --. The accumulation time is equal to the number of LVAL programmed with AT.
The minimum height of the window of interest for the auto trigger function is the 3 top lines of
the image. The height of the auto trigger window can be programmed in the range AT = 3 to
493. The window is always from the top of image. The read out time is the active number of
LVAL + 9 LVAL.
Maxim frame rate is 5403 fps given by the 11 LVAL for a minimum window read out.
(1 LVAL = 16.825 µsec.)
The connected frame grabber should be programmed to sense if objects passing the window.
The horizontal position and the signal threshold could be the programmed parameters. If an
object passing is detected, a trigger is send to the camera, and a full frame is exposed with the
same accumulation time as programmed for AT. The resulting image, a full frame or windows
scan, (depending of windows scan setting), is read out to the grabber, and the auto trigger
function will start again.