Persistence of vision how does it relate to film?

Persistence of vision is the optical illusion that occurs when a series of still images displayed in rapid succession appear to be a continuous moving image. This phenomenon was first described by the Belgian physicist Joseph Plateau in 1832.

Persistence of vision is the basis of all moving images, including film and video. When a film projector projects a series of still images onto a screen at a rate of 24 frames per second, the images appear to blend together and create the illusion of continuous motion.

The same principle is used in video, where a series of still images are displayed on a screen at a rate of 30 or 60 frames per second. The faster the frame rate, the smoother the motion will appear.

Persistence of vision is also responsible for the wagon-wheel effect, where the spokes of a wagon wheel appear to be moving backward when the wheel is actually rotating forward. This illusion occurs because the brain retains the image of the spokes in their previous position for a brief moment, even after the wheel has moved.

Persistence of vision is a fascinating phenomenon that has been used to create some of the most amazing and immersive experiences in human history. From the early days of film to the latest advances in virtual reality, persistence of vision has played a key role in bringing images to life.

Here are some additional facts about persistence of vision:

* The human eye can perceive images that are displayed for as little as 1/25 of a second.

* The critical fusion frequency (CFF) is the minimum frame rate at which a series of still images appear to be continuous. The CFF varies from person to person, but it is typically around 24 frames per second.

* Persistence of vision can be used to create a variety of optical illusions, such as the wagon-wheel effect and the motion aftereffect.

* Persistence of vision is a fundamental principle of all moving images, including film, video, and animation.