[MPlayer-users] deinterlace+horiz scale

[Ville Saari]

On Tue, Jun 08, 2004 at 08:36:21PM +0200, Matthias Wieser wrote:

> > Depending on the viewing conditions this can actually be a good thing.
> 
> a good thing because you can't see details anymore? Must have been a 
> really bad film... ;-)

Good if one prefers smooth motion over sharpness.

You only see moving object sharply if you follow it with your eyes so that
the image on your retina is stationary. It works if you are watching real
world, but video is not real world: sharp moving object will actually
move backwards on your retina and then jump forward when the frame changes
resulting jerky motion. Motion blur masks this.

If the movie is displayed on cinema screen or CRT computer display, another
even more annoying defect appears: Each frame is displayed as multiple
brief flashes and motion without motion blur results moving objects being
seen double or triple.

The only situation where motion without motion blur actually works is
interlaced content watched on CRT television (not 100Hz). TV will flash
each field only once and if the eye follows the moving object, each
field will be "exposed" on the same position on the retina resulting
an illusion of perfectly smooth motion.

-- 
 Ville