AW00123409000 Image Acquisition Control
Basler ace USB 3.0 153
Flash Window in Global Reset Release Mode
If you are using the global reset release mode, you should use flash exposure for capturing images
of both stationary and moving objects. If you don’t use flash exposure when capturing images of
stationary objects, the brightness in each acquired image will vary significantly from top to bottom
due to the differences in the exposure times of the lines. If you don’t use flash exposure when
capturing images of moving objects, the brightness in each acquired image will vary significantly
from top to bottom due to the differences in the exposure times of the lines and the images will be
distorted due to the temporal shift between the end of exposure for each line.
You can avoid these problems by using flash lighting and by applying the flash during the "flash
window" for each frame. The flash window is the period of time during a frame acquisition when all
of the lines in the sensor are open for exposure.
Figure 65 illustrates the flash window for the global reset release mode.
In global reset release mode, the flash window opens when the frame is triggered and closes after
a time period equal to the ExposureTime parameter setting. Thus, the flash window width (i.e., how
long the flash window will remain open) is equal to the ExposureTime parameter setting.
To facilitate the use of flash lighting, you can use the flash window output signal (see Section 6.8.2
on page 163). The flash window signal goes high when the flash window opens and goes low when
the flash window closes.
For more information about the ExposureTime parameter, see Section 6.5 on page 139.
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