Smearless Mode | JAI CV-A1-20 specification

CV-A1-20

6.10. Smearless Mode

This mode will reduce the unwanted smear signal from a highlighted scene when a short exposure time is used. The trigger mode is like edge pre-select, but a dummy readout is performed before the active accumulation is started. It will remove the smear above the highlighted parts in the image, but there is still smear left below highlighted areas.

The trigger leading edge will start the dummy readout. It takes 54 H before the exposure starts. The exposure stops and the resulting video signal is read out after the selected shutter time. It can be the 16 step normal or 1023 step programmable. SM=0 or SM=1.

This mode will operate with full and partial scanning and with all binning modes. Partial scanning together with binning will work, but it is not described, and no timing diagrams will be documented. An EEN pulse will indicate the active accumulation time, and a WEN pulse indicates that the resulting video is being read out.

To use this mode:
Set function: Trigger mode “Smearless read out”		TR = 6
	Shutter mode “Normal” or “Programmable”	SM=0, SM=1
	“Shutter Speed”	SH=0 through 9
	“Programmable exposure”	PE=1 through 1023
	Polarity and other functions
Input:	Ext. trigger to pin 5 on 6 pin connector (or pin 11 on 12-pin connector).
	Ext. HD to pin 6 on12-pin connector. (If used).

Important notes on using this mode.

•The start of exposure will start synchronized to the internal H signal. The start may be shifted max 1H. To avoid this shift (1 H jitter), synchronize the camera to an external HD and make sure that the trigger pulse aligns to the HD as shown in fig. 17.

•The duration of the trigger should be >1H to <2000H.

•A new trigger must not be applied before WEN is high.

•In trigger modes there are no continuous VD out, only after each trigger input.

1H = 83 6 ∝s

No equalize and serration pulses.

	A	B	C	D	E		Max frame rate	Remarks
Scan mode			CCD array line #	Effective video			fps
Full	10H	14H	4 to 1038	1035H	18H		11
1/2 Partial	17H	33H	271 to 783	513H	25H	18
1/3 Partial	17H	33H	357 to 697	341H	25H	25
1/6 Partial	17H	33H	442 to 612	171H	25H	38
H binning	10H	14H	4 to 1038	1035H	18H	11
V binning	10H	14H	18 to 1019	501H	18H	20
V+H binning	10H	14H	18 to 1019	501H	18H	20

Fig. 25. Smearless Mode

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