DVL-Digest 1568 - Postings: Index 16:9, 4:3 And HDTV CCD resolution and quality of video - (2) 16:9, 4:3 And HDTV - "Perry Mitchell" From: Cliff Elliott I have a question relating to 16:9 ratio video, now I know this subject has been covered many times in the past, but to be honest I am still confused and to make it worse I wish to purchase a new camera and have settled on two candidates but cannot choose between them because of the confusion relating to 16:9. (edit) Is there was a definitive detailed but straight forward document explaining 16:9, 4:3 and HDTV that would make sense to the lay person. CCD resolution and quality of video - "Perry Mitchell" From: Cosmin Truta I also saw the term "Progressive-Scan CCD". Does it really means what I think it means: that the video is not interlaced, but progressive? I might be interested in such a thing, because progressive video makes a better playback on the computer - although the motion may look jerky on TV (30 or 25 fps instead of 60 or 50, respectively for NTSC or PAL). Hollywood studios make the film at 24 fps, and that's fine for them, because they apply motion bloor when necessary. Have you had any experience with such cameras? Is there a real downside for the motion, or is motion blur applied directly in the camera? (e.g. due to a longer exposure per frame... just guessing.) CCD resolution and quality of video - "Perry Mitchell" From: Robert Rouveroy Just to add to the confusion if any, motion picture film is indeed shot at 24 fps, in most cases, half the time used is for exposure, the other for pulldown. But during projection the pulldown is much shorter and the exposure to the lightbeam is interrupted 48 times and in many cases a five bladed shutter chops it up even more, thereby giving a very smooth motion. If projected or shown, for instance on a Moviola or Film editor like Steenbeck, those frames are also shown 24 x/sec, with of course a pronounced flicker. Attempts were made last century to increase the quality of film, among others by Doug Trumbull with ShowScan, film exposed and displayed at either 60 or 72 fps. Looked unbelievably good, but was too expensive. 48 fps is/was used also with IMAX and 3d IMAX If video is shown at 25 frames or even 30 frames, the choppiness or 'judder' would be pronounced, therefore the picture is interlaced and shown at resp. 50 and 60 frames. At 60, the judder is very small. At 50 however, it is often bad and certainly it gives a headache, so therefore, in PAL country the 50 is doubled to 100 fps (not really true, the frequency is doubled, giving the same result) in expensive sets, giving an extremely smooth motion. (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
 slashCAM  News HD Camcorder database One-on-One Cam comparison About our tests About us |
|
|
