Allied Vision Technologies MF-145B2 Instruction Manual download pdf (Page 91)

Controlling image capture

9 Controlling image capture

The cameras support the SHUTTER_MODES specified in IIDC V1.3. For all models this shutter is a

continuous modes the shutter is opened shortly before the vertical reset happens, thus acting

ombined with an external trigger, it becomes asynchronous in the sense that it occurs whenever

recorded when an external trigger impulse is

ensu st m an be g d with

minimal image blur.

The external trigger is fed as a TTL signal through Pin 4 of the HiRose conn

Normally a rolling curtain shutter is used to

orten the expos e or integration ti curtain’s widt fines the d

curtain sweeps with the frame readout time over the image. Although this is appropriate for

ill images, image istortion will be c moving ob us part

scanned earlier than the lower image part. Fo

nly. A side effect of global sh n or shutter time is added to the

readout time, thus affecting the frame rates to be achieved.

and special

igger_Mode_0 sets the shutter time according to the value set in the shutter (or extended

utter) register. Trigger_Mode_1 sets the shutter time according to the active low time of the

pulse applied (or active high time in the case of an inverting input).

global shutter; meaning that all pixels are exposed to the light at the same moment and for the

same time span.

in a frame-synchronous way.

the external trigger occurs. Individual images are

present. This res that even fa oving objects c rabbe no image lag and with

ector.

For CMOS sensors, a global shutter is not common.

sh ur me. The h de integration time an

the

st d reated with

r this reason the MF-131 features global shutter

jects, beca e the upper image

o utter is that the integratio

9.1 Trigger modi

The cameras support IIDC conforming Trigger_Mode_0 and Trigger_Mode_1

Trigger_Mode_15.

Figure 54: Trigger_mode_0 and 1

MARLIN Technical Manua

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Allied Vision Technologies MF-145B2 Instruction Manual Page 91