AW00123409000 Image Acquisition ControlBasler ace USB 3.0 151For more information about the flash window output signal, see Section 6.8.2 on page 163.Setting the Shutter ModeThe cameras have two shutter modes: rolling and global reset release.You can set the shutter mode from within your application software by using the Basler pylon API.The following code snippets illustrate using the API to set the shutter modes:// Set the shutter mode to rollingcamera.ShutterMode.SetValue(ShutterMode_Rolling);// Set the shutter mode to global reset releasecamera.ShutterMode.SetValue(ShutterMode_GlobalResetRelease);You can also use the Basler pylon Viewer application to easily set the mode.6.6.2.3 The Flash WindowFlash Window in Rolling ModeIf you are using the rolling mode, capturing images of moving objects requires the use of flashexposure. If you don’t use flash exposure when capturing images of moving objects, the images willbe distorted due to the temporal shift between the start of exposure for each line.You can avoid distortion problems by using flash lighting and by applying the flash during the "flashwindow" for each frame. The flash window is the period of time during a frame acquisition when allof the lines in the sensor are open for exposure.Figure 64 illustrates the flash window for the rolling mode.You can calculate when the flash window opens (i.e., the time from the point where the frame istriggered until the point where the window opens) using this formula:Time to Flash Window Open = tRow x (ROI Height -1)You can calculate the flash window width (i.e., how long the flash window remains open) using thisformula:Flash Window Width = ExposureTime Parameter Setting - [ (tRow x (ROI Height -1) ]The tRow values are the same as for both, rolling and global reset release mode and are given inTable 35 on page 145.When setting the ShutterMode parameter, make sure the camera is not acquiringimages. Otherwise, the camera might crash.
