Comments on: The joys of interlaced video http://www.thisnerdheard.com/index.php/2007/04/25/the-joys-of-interlaced-video/ Ramblings of a computer geek Tue, 03 Jan 2012 19:30:48 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: ejohnson http://www.thisnerdheard.com/index.php/2007/04/25/the-joys-of-interlaced-video/comment-page-1/#comment-132 ejohnson Fri, 27 Apr 2007 06:29:35 +0000 http://www.thisnerdheard.com/index.php/2007/04/25/the-joys-of-interlaced-video/#comment-132 So this issue was a bit more complicated than just a matter of fields. The problem has to do with the way that the monitor filters the signal. It seems that because my line was so thin, it was misinterpreting the line as color information and that was bleeding into the picture causing what looks like flicker. Because of the way NTSC and PAL work, you can't transition sharply between colors. I need to make my line wider and blend it in by providing gradual steps between the background color and my overlay. So, you need to double your line in the Y direction to prevent flicker from fields and you need to widen your line in the X direction to prevent color bleeding and the "flicker" that results from it. So this issue was a bit more complicated than just a matter of fields. The problem has to do with the way that the monitor filters the signal. It seems that because my line was so thin, it was misinterpreting the line as color information and that was bleeding into the picture causing what looks like flicker. Because of the way NTSC and PAL work, you can’t transition sharply between colors. I need to make my line wider and blend it in by providing gradual steps between the background color and my overlay.

So, you need to double your line in the Y direction to prevent flicker from fields and you need to widen your line in the X direction to prevent color bleeding and the “flicker” that results from it.

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