When your phone takes a photo of something, it scans the frame of view line-by-line from top to bottom quickly. But, if you’re photographing an object like a fan or plane’s propellor that’s moving very quickly, the scanning exposure can warp the final image.
That’s the rolling shutter effect. Using high-speed camera footage to simulate the warping, Smarter Everyday shows us exactly how the rolling shutter effect occurs. The guitar strings are the coolest; more of that in this video:
The “rolling shutter” can be either mechanical or electronic.The advantage of this method is that the image sensor can continue to gather photons during the acquisition process, thus effectively increasing sensitivity. It is found on many digital still and video cameras using CMOS sensors.
The effect is most noticeable when imaging extreme conditions of motion or the fast flashing of light. While some CMOS sensors use a global shutter,the majority found in the consumer market use a rolling shutter.