In most still images taken from the recording of moving objects, details lose clarity due to the relatively slow shutter speed of 1/50 sec (or 1/60 sec) used in standard CCTV cameras. This makes identification of individuals and vehicle license plates, for example, difficult or even impossible.
The solution is to increase the shutter speed to freeze the picture, which only worsk as long as there is enough light. Increasing the shutter speed means increasing the illumination level or the lens aperture to compensate for the shorter exposure. Once the light level goes down and the lens is fully open, the camera's Automatic Gain Control (AGC) can be triggered to provide further gain. However, when this has reached its limit, the image simply degrades until it is no longer useful.
The Bosch DinionXF camera can obtain images without motion blur for an extended period because it combines several features that work together to maintain optimal performance. By switching the DinionXF into Default Shutter Mode, you can set the shutter speed at a default value (for example, 1/250 sec). As long as there is sufficient light in the scene for the Auto Iris lens control and AGC to produce a full video signal, the shutter speed remains fixed at the default value. Only when the light fails will the shutter control take over to reduce shutter speed until the standard value is reached. Motion blur will recur at this lower shutter speed, but this is preferable to losing the video signal completely. This Default Shutter system provides video without motion blur for as long as possible, and yet still allows imaging within the full range of lighting conditions.
