DVL-Digest 487 - Postings: Index Film mode - Progressive scan Matrox and Mac Film mode - Progressive scan - Perry Mitchell There seems to be a lot of misunderstanding around about exactly what progressive scan actually is! All current consumer ccd chips operate a progressive 'scan' for each field, but all current consumer cameras use an interlaced recording format. The manufacturers normally process the progessive field scans to average line pairs (rather than discarding the unused lines) since this increases sensitivity, reduces noise, and removes any interlace twitter due to excessive vertical resolution. Such (analog) processing is an inherent part of the ccd chip set and cannot easily be changed. The broadcast cameras have more control due to use of multiple mode processing with menu selection. I know that Sony have experimented with 'Film mode' pseudo progressive scan but have apparently found the vertical aliasing (twitter) unacceptable. Now such twitter disappears when the video is converted to progressive scan (such as film) or viewed on a line or field doubling device, but this is hardly a basis for designing a mass market consumer product. Canon have a complicated processing scheme partly necessary due to it's use of interleaved ccd sensors to increase apparent resolution. This presumably limits vertical resolution to a level where twitter is not a problem. Matrox and Mac - "Perry" Todd Hoyer posted: >I'm running Final Cut 1.2 on a G4 450 MHZ 512 MB RAM. I've been thinking about purchasing the Matrox RD2000 card, but can't find any documentation about if it works with MAC or not. Anyone out there tried this? Also, I would mainly be using this for editing purposes, and using it for display a little bit. Any ideas on if this is a good solution or not, or am I barking up the wrong tree here? Can anyone recommend net resources for DVD authoring? I'm looking for material that does a good job of explaining the process without a lot of marketing hype and "solutions." Thanks (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
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