Re: [trimedia] ICP vertically filtering and scaling problem?
sounds like the scan type of your source material is 'interlaced'. This
means that the 2 fields that make the frame are shot at a different moment
in time. When you apply "frame based vertical scaling", you are
intermixing two different moments in time in the resulting fields/frames.
This results in the artefacts you describe. The solution is to either 1)
"field based vertical scaling" (=scaling the fields separately) or 2)
deinterlace first and apply frame based scaling on the result. For the
PNX1302, I recommend option 1.
tmVpostIcp, an IADK component, has the option to either do field or frame
Wim van Halen
MPTK (The Media Processing Tool Kit for TriMedia)
Philips Applied Technologies - Leuven
Building C, room 171
Interleuvenlaan 74..82, B-3001 Heverlee, Belgium
Tel: +32 16 394478, Fax: +32 16 390601, Email: Wim.van.Halen_2@...
2005-05-31 05:27 PM
Please respond to trimedia
cc: (bcc: Wim Van Halen_2/LEU/PDSL/PHILIPS)
Subject: [trimedia] ICP vertically filtering and scaling
I meet a problem about ICP vertically filtering and scaling. My
application runs on PNX1302 with SDE 2.1.My application wants to
capture video from VI and down-scale these frames from 720*576 4:2:2 to
720*480 4:2:0.So I use ICP. But the result frames are distorted at the
vertical edges of moving objects. I tried down scale these frames to
720*288,and it works well. Could anybody tell me why?Thanks a lot.
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