The full sensor of the camera is selected automatically but the AOI can be set to a number of predefined values.
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Predefined AOIs can be selected using the AOI option in the application bar above the image.
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Simply click the little triangle in the bottom right corner of this button or just right click anywhere on it to show the list of AOIs.
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Select from the values in the list to apply this AOI to the camera sensor. AOI are centred within the sensor.