by Ed Calverley | Aug 20, 2019 | Video
Temporal Aliasing is where artefacts appear in video due to the interaction between the time/speed of sampling and motion of objects being imaged. When the frequency of the frame rate used matches any cyclic motion in the scene being captured an effect known as...
by Ed Calverley | Aug 20, 2019 | History
Matt Parker explaines why the NTSC world got stuck using a frame rate of 29.97Hz instead of 3ohz. It was all due to the introduction of compatible colour and needing to avoid interference. The PAL system used outside of North America was based on a whole new 625-line...
by Ed Calverley | Aug 20, 2019 | Cameras
When a camera captures fast movement it can result in strange artefacts becoming visible due to the exact time at which the camera’s sensor samples the light coming through its lens. There are two main ways in which a camera samples the scene: Rolling Shutter...
