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IDS peak 2.10.0 / uEye+ firmware 3.34

Navigation: B: Operation of uEye+ cameras > Operating a camera > Monitoring camera status

Signals and events from rolling shutter sensors

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The exposure of rolling shutter sensors starts sequentially row by row, see Shutter methods.

The rows are read out as soon as their exposure ends. The read-out duration depends on various factors, such as:

Sensor

Pixel format

ROI (region of interest)

Decimation and binning

The camera generates the following internal signals:

Signal

Description

ExposureActive

TRUE during exposure of the pixels, starting with the first and ending with the last row.

ExposureStart

Indicates the start of exposure (= start of "ExposureActive").

ExposureEnd

Indicates the end of exposure (= end of "ExposureActive").

ReadOutActive

TRUE during the read-out of the pixels.

ReadOutStart

Indicates the start of the read-out (= start of "ReadOutActive").

ReadOutEnd

Indicates the end of the read-out (= end of "ReadOutActive").

Additionally, the camera generates the following events (see Activating events), informing a host application about their occurrence:

Event

Description

Event data

ExposureStart

Notify the host application about the start of exposure.

Corresponding frame ID.

ExposureEnd

Notify the host application about the end of exposure.

Corresponding frame ID.

Fig. 76: Timing of rolling shutter sensor with sequential frames

Fig. 76: Timing of rolling shutter sensor with sequential frames

Many rolling shutter sensors allow for overlapping frames. This means, that the exposure of the next frame can already be started, while the previous frame has not been finished, yet. In this case, the camera signal "ExposureStart" for the second frame is emitted before the "ExposureEnd" signal of the first frame. This results in an constant "ExposureActive" signal, because at any time, one of the sensor's rows is in exposure - be it for the previous or the following frame.

Fig. 77: Timing of rolling shutter sensor with overlapping frames

Fig. 77: Timing of rolling shutter sensor with overlapping frames

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