The field rate of an interlaced video image is twice the effective frame rate, since interlacing draws only half of the image (the odd- or even-numbered lines) at a time. Interlacing is a method of displaying images on a raster-scanned display device, such as a cathode ray tube (CRT). ... Frame rate, or frame frequency, is the measurement of how quickly an imaging device can produce unique consecutive images called frames. ...
For example, a field rate of 60 Hertz will correspond to a 30 frames-per-second moving picture. The hertz (symbol Hz) is the SI unit of frequency. ...
The fieldrate of an interlaced video image is twice the effective frame rate, since interlacing draws only half of the image (the odd- or even-numbered lines) at a time.
For example, a fieldrate of 60 Hertz will correspond to a 30 frames-per-second moving picture.
Theoretically, an interlaced signal could have three or more fields per frame, resulting in a fieldrate that is a 3x or higher multiple of the frame rate.
The frame rate is related to but not identical to a physiological concept called the flicker fusion threshold or flicker fusion rate.
The exact rate varies depending upon the person, their level of fatigue, the brightness of the light source, and the area of the retina that is being used to observe the light source.
These rates would be impractical for the actual frame rate of most film mechanisms so the shutter in the projection devices is actually arranged to interrupt the light two or three times for every film frame.
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