Rolling shutter is a method of image capture in which a still picture (in a still camera) or each frame of a video (in a video camera) is captured not by taking a snapshot of the entire scene at a single instant in time but rather by scanning across the scene rapidly, either vertically or horizontally. In other words, not all parts of the image of the scene are recorded at exactly the same instant. (Though, during playback, the entire image of the scene is displayed at once, as if it represents a single instant in time.) This produces predictable distortions of fast-moving objects or rapid flashes of light. This is in contrast with “global shutter” in which the entire frame is captured at the same instant.

To Overcome motion distortion caused by capturing fast moving objects with rolling shutters, most industrial rolling shutter cameras comes with Global Reset features that allows using strobe lights with rolling shutter cameras to freeze fast moving objects. When global reset is turn on, there is a short period of time when exposure of all lines are active, this allow application to turn on the strobe light ( typically controlled by cameras output) during this period that allows the camera to freeze the object. However care have to be taken to control ambient lighting condition, as the exposure of the  lines will stop sequentially instead of all at once.

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Reference

• Airplane propeller blades – rolling shutter effect on YouTube
• Rolling Shutter on WikiPedia