In-Sight 8405 Rolling Shutter Operation

The In-Sight 8405 vision system has an electronic rolling shutter to control the exposure of the image sensor. When the vision system receives an acquisition trigger, the pixel rows are exposed sequentially, starting with the first pixel row at the top of the image and proceeding to the last pixel row at the bottom of the image. Each pixel row is exposed for the same length of time, however each row begins exposing at a different time and the exposure of each adjacent row is overlapped. Once all rows have been exposed, the total image readout is complete and the pixel rows are reset. When the next acquisition occurs, the pixels rows are read out again for the duration of the specified Exposure.

For the In-Sight 8405 vision system, the Row Reset and Row Readout time is 36.38µs. Use the following formulas to determine the Total Reset, Total Image Readout and Total Runtime based on the Number of Rows and Exposure values specified. For more information, see AcquireImage.

Timing	Formula
Total Reset	Row Reset x (Number of Rows -1)
Total Image Readout	(Row Readout x Number of Rows) + 360µs
Total Runtime	Exposure + Total Image Readout

Note:

To ensure optimal image quality, the part must be stationary during image acquisition.
Due to the electronic rolling shutter operation, a "rolling line" effect may be visible when in Live Video mode.

Configure Outputs

The vision system's high-speed outputs can be optionally configured as Acquisition Start or Acquisition End signal types. When configured as Acquisition Start, the signal is pulsed when the first pixel row is exposed; when configured as Acquisition End, the signal is pulsed when the Total Image Readout is complete. The pulse length of these signals are specified in the Output Details dialog. For more information, see AcquireImage.

If using a strobe, the vision system's HSOUT 1 line can be configured as a Strobe signal type. When configured as Strobe, the Strobe Start Position in the Output Details is fixed to All Rows Exposed and the output signal is pulsed for the duration of the Strobe Width, when all pixel rows are exposed.

For the In-Sight 8405 vision system, the Row Reset time is 36.38µs. Use the following formulas to determine the Time to Strobe Start and the Strobe Width.

Timing	Formula
Time to Strobe Start	(Row Reset x Number of Rows) + 946µs
Strobe Width	Exposure - Time to Strobe Start

Note: If using a strobe with the In-Sight 8405, the Exposure time must be greater than the Time to Strobe Start, to ensure that all pixel rows are exposed when the strobe is pulsed.