But as you have seen, even a deinterlaced image can flicker, shimmer etc:
If an image is TOO sharp, this may cause flickering in thin sharp vertical lines when viewed on an interlaced TV. This is caused by the fact that a thin and sharp 1-line vertical object is visible only half of the time and even a 2-line vertical object may seem to jump up and down on an interlaced TV. See interlace flicker:
<http://www.lurkertech.com/lg/fields/fields.html>
Here is also a related page I recently found when in vain I tried to find a very nice page I once saw describing how to prepare line art for video.
<http://www.roseavenue.com/premiere/director.html#Part4>
Some still image-oriented applications intentionally slightly blur images to reduce the flicker. One nice approach is to slightly blur the still image with 1 pixel 90° (vertical) Motion Blur (the 1 pixel value applies to PAL/NTSC 576/480 vertical resolutions and if the vertical resolution of the input still is larger you have to increase the filter's pixel value accordingly.
For example: if the input still is 2048 x 1536, use 3 pixel value in the filter because 1536/576=2.7). The idea is to cut down on vertical resolution (excess of which causes interlace flicker on an interlaced TV) without compromising horizontal resolution.
-- Matti Haveri <[EMAIL PROTECTED]> <http://www.sjoki.uta.fi/~shmhav/>
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