Many modern video games feature motion blur, especially vehicle simulation games. This is why a video game with a frame rate of 25-30 frames per second will seem staggered, while natural motion filmed at the same frame rate appears rather more continuous. Without this simulated effect each frame shows a perfect instant in time (analogous to a camera with an infinitely fast shutter), with zero motion blur. This simulated motion blur is typically applied when either the camera or objects in the scene move rapidly. In computer animation this effect must be simulated as a virtual camera actually does capture a discrete moment in time. Two animations rotating around a figure, with motion blur (left) and without In this case, even with long exposure times, the moving objects will appear sharper while the background will become more blurred, with the resulting image conveying a sense of movement and speed.
In a film or television image, this looks natural because the human eye behaves in much the same way.īecause the effect is caused by the relative motion between the camera, and the objects and scene, motion blur may be manipulated by panning the camera to track those moving objects. This smearing may occur on an object that is moving or on a static background if the camera is moving. In such an image, any object moving with respect to the camera will look blurred or smeared along the direction of relative motion. As objects in a scene move, an image of that scene must represent an integration of all positions of those objects, as well as the camera's viewpoint, over the period of exposure determined by the shutter speed. Most often this exposure time is brief enough that the image captured by the camera appears to capture an instantaneous moment, but this is not always so, and a fast moving object or a longer exposure time may result in blurring artifacts which make this apparent. Because of technological constraints or artistic requirements, the image may represent the scene over a period of time. When a camera creates an image, that image does not represent a single instant of time.
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