CGI

CGI (computer gengerated imagery)

Computer-generated imagery is the use of computer graphics to produce and or subscribe to images in art, printed media, videos games, television Programs, films, videos, simulators and commercials/adverts. With GCI the visual optical scenes may be dynamic or static, and may be two-dimensional, but particularly the term "CGI" is mainly used to refer to 3d computer graphics used to generating scenes or special effects in films and television.

Computer animation is fundamentally a digital inheritor to stop motion animation of 3d models and frame-by-frame animation of 2d illustrations. Computer generated animations are more administrable than other more physically based processes as well as allowing a single graphic artist to produce such content without the need of actors, costly set pieces, or props. The illusion of movement is created when an image is displayed on the computer screen and then continuously replaced by a new image that is similar to the previous image (typically at the rate of 24 or 30 fps).

Timeline of computer animation in film and television

Rendering of a planned highway

1961

Metadata

1971

The Black Hole 1979
Alien 1979
Tron 1982
Indiana Jones and the Last Crusade 1989
Toy Story 1995
Avatar 2009
Gravity 2014

Optical Illusion of Motion

Optical Illusion of Motion

So what is Optical Illusion of Motion? 

Optical Illusion of Motion is when images occur to be moving. This happens as a result of the way our brains ascertain the image, this is often times referred to as a cognitive effect. The 'cognitive effect' can be caused by various factors such as color contrasts and shape/position and the speed in which images are being shown influencing the mental processes of perception, memory, judgment, and reasoning.

Stopmotion
 Previously I mentioned that the speed of an image can affect the way the brain recognizes an image/s this technique is called 'stopmotion'. 
 Stop motion (which is also known as stop frame) is an animation method that manually controls an object so that it appears to move on its own.The object is moved in small increments between individually photographed frames, creating the illusion of movement when the series of frames is played as a continuous sequence.
Eadweard Muybridge-
Muybridge set up a row of cameras with tripwires, each would trigger a picture for a split second as the horse ran by.  To prove this experiment Eadweard used Stop- Frame Animation. This technique is commonly used in clay-mation and puppet-based animation.The more frames the more detail and focus there is on the object.
 source: wikipedia