Persistence of Vision |
Persistence of vision is when a series of images are shown that appears to be moving when it is shown with in a quick succession. The actual term used is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina, and lends itself to animation by fostering the illusion of motion when images are viewed in closely-timed sequence to one another. The human eye always retains images for a fraction of a second (around 0.04 second). This means that everything we see is a subtle blend of what is happening now and what happened a fraction of a second ago.
In film and video, this phenomena is often claimed to account for our ability to perceive a sequence of frames as a continuous moving picture. However this idea was debunked in 1912 and there is no scientific evidence to suggest that persistence of vision works in this way.
Stop Frame |
Stop motion animation has a long history in film. It was often used to show objects moving by themselves. The first instance of the stop motion technique can be credited to Albert E. Smith and J. Stuart Blackton for Vitagraph’s The Humpty Dumpty Circus (1897).
Stop motion creates the illusion of movement when the series of frames is played as a continuous sequence. Dolls with movable joints or clay figures are often used in stop motion for their ease of repositioning.
Frame Rates |
Frame rates ( also known as frame frequency and frames per second)applies equally to a verity of occasions not only to video cameras and film but to motion capture systems and is even used in computer graphics, its a image device captures unique consecutive images called frames. Frame rate is most often expressed in frames per second (FPS) and is also expressed in progressive scan monitors as hertz (Hz).
“In the mid-1800s, inventions like the zoetrope demonstrated that a sequence of drawings, showing different stages of action, would appear as movement if shown at a rapid rate. The human eye can register 10-12 frames per second as individual images. However, beyond 10-12 frames per second, we accept the sequence as motion and the “seams” begin to disappear.” this information was taking from
http://vanillavideo.com/blog/2012/history-frame-rates-why-speeds-vary , this tells us how the human brain sees moving images in more detail.