P
PJnewbie
Guest
Guys,
I emailed PACE asking them if they knew why I get a flickery/shaky image when watching Sky+ through my InFocus 5700 PJ.
They replied with:
Your projector will invariably have a straightforward line doubling circuit to allow 625 line video signals to be displayed on computer monitors, LCD devices, plasmas displays or any other VGA display devices.
What is happening is that the interlaced set top box video is being doubledin line frequency by simply doubling the number of lines on each field of video. This doubling mechanism effectively over samples the signal without any subsequent anti alias filtering, leading to spatial jitters on the displayed image for picture detail with a vertical content of high frequency. This effect is particularly noticeable on graphics information and any picture content with high contrast between horizontal boundaries.
The solution is to invest in a higher quality de-interlacer that produces a VGA progressive scan with both fields combined and filtered correctly. Or turn the contrast down so the jitteriness is less noticeable.
I would have thought the onboard Faroudja (sp?) processor would combat this - is that not right?
Anyone know how I can stop this effect?
Ta!
I emailed PACE asking them if they knew why I get a flickery/shaky image when watching Sky+ through my InFocus 5700 PJ.
They replied with:
Your projector will invariably have a straightforward line doubling circuit to allow 625 line video signals to be displayed on computer monitors, LCD devices, plasmas displays or any other VGA display devices.
What is happening is that the interlaced set top box video is being doubledin line frequency by simply doubling the number of lines on each field of video. This doubling mechanism effectively over samples the signal without any subsequent anti alias filtering, leading to spatial jitters on the displayed image for picture detail with a vertical content of high frequency. This effect is particularly noticeable on graphics information and any picture content with high contrast between horizontal boundaries.
The solution is to invest in a higher quality de-interlacer that produces a VGA progressive scan with both fields combined and filtered correctly. Or turn the contrast down so the jitteriness is less noticeable.
I would have thought the onboard Faroudja (sp?) processor would combat this - is that not right?
Anyone know how I can stop this effect?
Ta!