Point Grey Flea3 FL3-U3 - Trigger Mode 15 (Multi-Shot Trigger Mode)

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Point Grey Flea3 USB 3.0 Technical Reference 6 Image Acquisition

Figure 6.4: Trigger Mode 1 (“Bulb Shutter Mode”)

For FL3-U3-32S2 and FL3-U3-88S2 models operating in this trigger mode,

exposure is controlled by the global reset feature of the sensor. This feature may

reduce distortion artifacts typical of rolling shutter sensors. For more

information, see Rolling Shutter Artifacts on page 128.

On FL3-U3-13Y3 a software trigger cannot be used for Trigger Mode 1.

6.4.6.3 Trigger Mode 15 (“Multi-Shot Trigger Mode”)

Trigger Mode 15 is a vendor-unique trigger mode that allows the user to fire a single hardware or software trigger and

have the camera acquire and stream a predetermined number of images at the current frame rate.

The number of images to be acquired isdetermined by the Parameter field of the TRIGGER_MODE register 0x830

(page 90), which allows up to 255 images to be acquired from a single trigger. Writing a value of 0 to the parameter

field will result in an infinite number of images to be acquired, essentially allowing users to trigger the camera into a

free-running mode. Once the trigger is fired, the camera will acquire N images with an exposure time equal to the

value defined by the SHUTTER register, and stream the images to the host system at the current frame rate. Once this

is complete, the camera can be triggered again to repeat the sequence.

Any write to the TRIGGER_MODE register 0x830 will cause the current sequence to stop.

During the capture of N images, the camera is still in an asynchronous trigger mode , rather than

continuous (free-running) mode. The result of this is that the FRAME_RATE register 0x83C will be

turned OFF, and the camera put into extended shutter mode. Users should therefore ensure that

the maximum shutter time is limited to 1/frame_rate to get the N images captured at the current

frame rate.

Title Article

Extended shutter mode operation for DCAM-compliant PGR Imaging Products

Knowledge Base Article 166

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