TheGoD
2005-08-28, 18:28:37
The HD Challenge
Most manufacturers have figured out clever ways to de-interlace standard definition DVD-quality video. The problem arises with 1080i HDTV content such as what you will see on HDNet, CBS, NBC, PBS, UPN, HBO, Showtime, INHD, Discovery Channel HD, and the WB (Fox, ABC, and ESPN use 720p). Since 1920x1080 represents six times the data, most deinterlacers, including those from Faroudja and the PureVideo in the GeForce 6600 are unable to intelligently deal with 1080i sources. For the majority of de-interlacers, 1080i HDTV is de-interlaced by ignoring one of the fields during each stage of processing. This means that 1920x1080i image is converted to 1920x540p before it goes to 1920x1080p. You can lose half your spatial resolution when considered on a frame by frame basis. This is an industry-wide problem. That ultra-high-end DLP for $5000? When you feed it a 1080i source, it’s likely using one only one-field with 540 vertical lines to convert 1920x1080i into 1920x540 before going to1280x720p. Even most high-end 45” 1920x1080 LCD flat panels will take 1920x1080i down to 1920x540p before going up to 1920x1080p.
http://www.firingsquad.com/hardware/building_high_definition_home_theater_pc_htpc/
Warum schaft man sich eigentlich solche Probleme, wo liegt Anno 2004/5 der Vorteil von interlaced Material im Vergleich zu progressiven? Eigentlich sollten doch z. B. 60 Halbbilder die gleiche Bandbreite belegen wie 30 Volbilder. Oder werden bei 1080i nur insgesamt 30 Halbbilder übertragen?
Most manufacturers have figured out clever ways to de-interlace standard definition DVD-quality video. The problem arises with 1080i HDTV content such as what you will see on HDNet, CBS, NBC, PBS, UPN, HBO, Showtime, INHD, Discovery Channel HD, and the WB (Fox, ABC, and ESPN use 720p). Since 1920x1080 represents six times the data, most deinterlacers, including those from Faroudja and the PureVideo in the GeForce 6600 are unable to intelligently deal with 1080i sources. For the majority of de-interlacers, 1080i HDTV is de-interlaced by ignoring one of the fields during each stage of processing. This means that 1920x1080i image is converted to 1920x540p before it goes to 1920x1080p. You can lose half your spatial resolution when considered on a frame by frame basis. This is an industry-wide problem. That ultra-high-end DLP for $5000? When you feed it a 1080i source, it’s likely using one only one-field with 540 vertical lines to convert 1920x1080i into 1920x540 before going to1280x720p. Even most high-end 45” 1920x1080 LCD flat panels will take 1920x1080i down to 1920x540p before going up to 1920x1080p.
http://www.firingsquad.com/hardware/building_high_definition_home_theater_pc_htpc/
Warum schaft man sich eigentlich solche Probleme, wo liegt Anno 2004/5 der Vorteil von interlaced Material im Vergleich zu progressiven? Eigentlich sollten doch z. B. 60 Halbbilder die gleiche Bandbreite belegen wie 30 Volbilder. Oder werden bei 1080i nur insgesamt 30 Halbbilder übertragen?