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22nd November 2006
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#1 |
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Member
Join Date: Sep 2005
Posts: 88
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Frame and Field per second
Ive read the manual of my cam and cant seem to understand the meaning of frame per second and field per second. Can anyone help me to explain these meanings. Thanks
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22nd November 2006
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#2 |
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Moderator
Join Date: Jan 2002
Location: New York City
Posts: 13,397
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Re: Frame and Field per second
u might want to take a look at this:
http://en.wikipedia.org/wiki/Digital_video |
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22nd November 2006
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#3 | |
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Member
Join Date: May 2006
Location: Redhill, Singapore
Posts: 346
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Re: Frame and Field per second
1 frame = 2 consecutive projections of the same picture (2 'fields'). Standard movie equipment projects 24 frames per second... hence 48 'fields' per second. This 'double projection of the same picture' is to enable a physiology phenomena known as 'persistence of vision' to reduce visual flicker effect. Video: 1 full frame = 2 interlaced fields (that is, a field with odd-numbered scan lines + a field with even numbered scan lines). In PAL system, we have 25 frames per second, or 50 fields per second (corresponding to the electric power line frequency of 50 Hertz in UK). In NTSC system, it would be (nearly) 30 frames per second, or 60 fields per second (corresponding to the electric power line frequency of 60 Hertz in US).
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* Take only pictures, leave only footprints, kill only time... and live a life! * :) Alvin Last edited by alvinsclee; 23rd November 2006 at 08:41 AM. |
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22nd November 2006
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#4 |
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Member
Join Date: Sep 2005
Posts: 88
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Re: Frame and Field per second
thank you guys for the help
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