On Mon, 20 Aug 2001 15:31:00 -0500, "JD" wrote:
>"Neuman - Ruether" wrote in message
>news:3b826d2d.2722833@newsstand.cit.cornell.edu...

>> >Other drawbacks include the dot crawl and feather effects with
>> >text and blockiness with high-motion video.

>> I have not observed any of the above ("S" or FireWire
>> connections, high-quality gear, no-dropouts as
>> conditions...). If you have, you are likely using
>> composite RCA connectors for video, low-quality
>> codecs or viewing gear, and are experiencing dropouts.
>> These are not intrinsic faults of the Mini-DV medium...

>I interpret the 'feather' effects as being mosquitos, and
>that is very much a limitation of the truncated DCT schemes
>represented by DV. The problem becomes worse with higher
>detail in the small 8x8 block.
>
>Careful filtering (and limiting the amount of detail), can mitigate
>the mosquito effect, but that trades one form of quality for
>another.
>
>Another way of describing that effect is that DV can only represent
>a certain amount of detail before the effects of the truncation of
>the transform becomes noticeable.

Yes, mosquito effect is easy to get with fine textures
and detail, especially with a sharp-imaging camera like
the VX2000, but I have never seen it on text, as the
original poster claimed...