<Li> Spatial aliasing . Vertically adajacent pixels are sampled in violation of the sampling theorem, when the camera or object motion is too rapid . One example of this is imaging of a quickly rotating propeller . The smear of each blade is caused by the propeller rotating at the same or near the same speed that the frame is read by the camera . Viewed perpendicular to a fan spinning clockwise, the blades on the left side appear thinner than usual while the blades on the right side appear thicker, and can even appear as if they aren't connected at the center . </Li> <Li> Temporal aliasing, including Partial Exposure . If a camera flash goes on for only part of the time of the exposure, the illumination of the flash may only be present for some rows of pixels in a given frame . For example, the top 1 / 3 of the picture may be brightly lit by a flash, while the bottom 2 / 3 of the picture is dark and unlit, as the flash was off by the time that part of the CMOS was sequenced . The difference between the two distinct parts of the frame can look odd . Similar problems can arise with fluorescent lighting, strobe effects, lightning, or any extreme situation where very fast motion or very fast bursts of light are seen in the time between when the CMOS chip sequentially records a frame . </Li> <P> The effects of a rolling shutter can prove difficult for visual effects filming . The process of matchmoving establishes perspective in a scene based on a single point in time, however this is difficult with a rolling shutter that provides multiple points in time within the same frame . Final results depend on the readout speed of the sensor and the nature of the scene being filmed; as a rule of thumb, higher end cinema cameras will have faster readout speeds and therefore milder rolling shutter artifacts than low end cameras . </P> <P> Images and video that suffer from rolling shutter distortion can be improved by algorithms that do rolling shutter rectification, or rolling shutter compensation . How to do this is an active area of research . </P>

What does it mean to fix rolling shutter