Path: utzoo!utgpu!attcan!uunet!cbmvax!jesup From: jesup@cbmvax.UUCP (Randell Jesup) Newsgroups: comp.sys.amiga Subject: Re: FlickerFixers Message-ID: <4451@cbmvax.UUCP> Date: 9 Aug 88 06:19:39 GMT References: <3269@crash.cts.com> <8473@swan.ulowell.edu> <7977@cup.portal.com> Reply-To: jesup@cbmvax.UUCP (Randell Jesup) Organization: Commodore Technology, West Chester, PA Lines: 32 In article <7977@cup.portal.com> Chad_The-Walrus_Netzer@cup.portal.com writes: >In a previous article,blunders... er, writes: >)haitex@pnet01.cts.com (Wade Bickel) wrote: >)>But I really don't like the way objects in motion split > I'm sory to say that this is WRONG, Bob. What the Flicker Fixer does >is buffer the last frame, and then displays that frame one more time, so that >the scan lines that would have faded by 1/30th of a second, are shown again. >The magical result is no flicker. This make static images look GREAT >(ESPECIALLY on a Zenith Flat Screen Monitor, by the way). However, since that >last frame is displayed once more, if the current frame is significantly >different from the last frame, you will see "lines" left over where the object >was. A simple way to demonstrate this is to move the mouse pointer >semi-rapidly on the screen. You will clearly see those left over lines... It >is not caused by the monitor, or in the way your eye/brain interprets the >interlace (as you state), but is a result of something which otherwise would >have faded being re-displayed... Sort of. FF takes video that consists of SF1,LF1,SF2,LF2,... (short field/long field), and displays it as (SF1/LF1),(SF2/LF1),(SF2/LF2), (SF3/LF2), etc. The reason objects break up when moving more than 1 pixel per field (1/60sec) is that between sf1 and lf1 the object has moved. Normally your vision integrates this as a solid object moving, even though you only see every other line at any 1 time. When they are displayed at the same time (and therefor same luminance) it is obvious that every other line is offset. This is why digital TV people who do scan-doubling do interpolation to make this less obvious (I think). It's still nice to have de-interlaced video. -- Randell Jesup, Commodore Engineering {uunet|rutgers|allegra}!cbmvax!jesup