[MPlayer-users] Re: which deinterlace filter

[Stefan Seyfried]

D Richard Felker III <dalias at aerifal.cx> writes:

> Incorrect. The vertical blend filter is either invertible, or almost
> invertible (depending on what it does at the top and bottom
> boundaries), so either no resolution is lost, or at most one dimension
> of resolution is lost.
> 
> On the other hand, pure interpolative filters (li, ci), almost-pure
> interpolative ones (fd), and hybrid ones (md) lose a LOT of
> resolution! Other than md, they throw away half the lines! With md the
> results are much less predictable; it will only throw away local
> minima and maxima, but there can be lots of those in a picture with
> high frequency content or high motion combing. It can throw away
> anywhere from nothing to 50% of the image.

This is also my experience. I need deinterlacing for watching live PAL
tv on an LCD monitor. There is no telecine, only interlacing.

li and ci are about the same than just capturing with height=288 and then
scaling ;-) md is the same, but additionally the image seems to be jumping
up and down one scanline, fd is also not better.

>> - moving objects become heavily blurred
> 
> Yes. Linear blend is HORRIBLE when applied to telecined video since
> you're blending two images from 1/24 sec apart, which could be very
> different! On the other hand, with true interlaced NTSC video, fields
> are only separated by 1/60 sec in time, so blurring will be much less
> significant. Personally, I find the slight blurring to be a very small
> price to pay to avoid losing half the resolution in stills.

me too, although it makes newstickers on the bottom of the screen hard to
read, they are better with other deinterlacing methods.

I still have to try the pullup/down-methods, but i always thought, that
they were for that strange american TV format only ;-)

regards,

     Stefan
-- 
 Stefan Seyfried, seife at gmane0305.slipkontur.de
+----------------------------------------------+

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