What role did sports photography play?

This is because in this case, continuous movement? It is essentially an illusion. Every time you think you see something moving, what you actually see is a series of still images that are still displayed together, and your brain pieces them together into a continuous scene. When the motion of the object is consistent with the sampling rate, the stroboscopic effect will appear. The working principle of a camera is to capture a large number of still images in a short time. For example, a television camera captures about 50 frames per second. This is enough to deceive our eyes and brains into thinking that what we see is a continuous moving image.

Suppose the sampling rate of your photographic equipment (or eyes) is 20 frames per second. If you see a fan blade that rotates 20 revolutions per second, what will you see? Records of each device? Images? Just one lap apart. So when you watch the video, your eyes always record the fan in the same position, that is, your brain stitches them together to form a still image, so you can't see the fan blades moving.

Imagine a wheel with four spokes perpendicular to each other and focused at 12. If the spoke has rotated clockwise for nearly a full circle until 1 1 point when the next frame is taken, and your brain thinks about the position of the spoke moving, it will rotate counterclockwise from 12 point to1point, which will make the wheel look like it is reversing.

This effect can also be clearly found under the fast flashing strobe light. Because strongpoint has the same function as a camera, it can take a lot of snapshots for you by blinking. In some cases, street lamps will flash continuously for about 50 times per second due to alternating current, thus highlighting this effect. This can be a serious danger in an industrial environment. If the rotating frequency of the equipment is equivalent to the stroboscopic frequency of the light source, due to this influence, the staff may not be able to observe the moving machine, thus causing a major accident.