Re: compensate for 'pixel shimmer' on LCD screens somehow?

jkn wrote:

I'm not referring to pauses due to the DVD being paused, but when
motion in the content is paused ... so for instance someone turns
their face, then stops, then carries on moving. The sharpness seems
to 'lock in' for part of a second as they are stationary, and then
goes (relatively) blurry again when they move.

LCD tvs are typically built to deinterlace fields-based material whenever it contains motion. This is because they don't draw the picture on the screen using a scanning electron beam and an interlaced scanning pattern (like the CRT-based tv sets do), but display static images over the entire screen area at once (or nearly so), instead.

The set is constantly on the watch, trying to detect whether the incoming signal is depicting a still image, or frame-based moving material (such as a movie that was originally shot on film and then telecined - i.e., where the adjacent field pairs belong to the same instant of time), or field-based moving material (that is, normal interlaced video shot using a normal video camera, where each field is shot at a different time, and the notion of "frames" does not make any sense, except for still scenes or images.)

Deinterlacing field-based material, if not done in a smart way, results in a severe loss of vertical resolution. In the worst case - with the simplest and cheapest possible deinterlacing algorithm a- you would just create the "missing lines" in a field by the means of straightforward interpolation (during motion scenes, when you can't really directly combine the odd and even fields into the same frame and display them at once). That kind of simple deinterlacing algorithm would result in the (perceived) vertical resolution dropping to half every time something starts moving on the screen, and then going back to full resolution when the motion stops and the scene is (mostly) still again (i.e., doesn't trigger the deinterlacing threshold.)

50 Hz CRT sets display standard definition interlaced video images as ${DEITY} originally intended - as an interlaced pattern scanned with an electron beam - so they don't need to employ such tricks.

For more information, see:

<http://lurkertech.com/lg/fields/fields.html>
<http://100fps.com/>
<http://100fps.com/video_resolution_vs_fluidity.htm>
<http://100fps.com/frame_interlacing_is_not_display_interlacing.htm>

....and for related topics:

<http://en.wikipedia.org/wiki/Pixelplus>

<http://www.research.philips.com/password/archive/24/down
loads/pp2-hd_backgrounder_europe-ap.pdf>

<http://www.research.philips.com/newscenter/dossier/naturalmotion/>

<http://www.research.philips.com/password/archive/7/natmot.html>

--
znark

.

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