[mythtv-users] interlaced vs not?

[David Hoelzer]

Just lending support to this correct view of interlacing.  The "pixel" 
layout that was described previously has nothing to do it and is simply 
the result of the mesh screen in front of the electron gun in the tube.

On Apr 30, 2004, at 11:58 PM, Grant Edwards wrote:

> On Fri, Apr 30, 2004 at 04:27:43PM -0700, Chris Petersen wrote:
>
>>> Where did you hear of this definition?  I've never heard of
>>> that before.
>>
>> I worked for Computer City in high school...
>
> 'Nuf said.
>
>> We sold monitors labeled interlaced (old style, think of a
>> brick wall with staggered bricks) or non-interlaced (trinitron
>> style, all pixels line up evenly on a grid)..
>
> The physical layout of the phosphor dots has nothing to do with
> it. Interlaced refers to "drawing" the screen half of the scan
> lines at a time.  Even lines, odd lines, even lines, etc.  In
> NTSC video the "halves" are done at 60HZ (well close anyway),
> so you get a complete frame rate of 30Hz.
>
> The alternative is "progressive" scan in DVD terms: you draw
> all the scan lines every time, all in order from top to bottom.
> Before DVD players came along, everybody just called it
> "non-interlaced".
>
>> Then came the weird ones like NEC which were triangles of
>> pixels, or viewsonic's array of staggered dots.  Either way,
>> many tv's are still the old staggered-style pixel layout, and
>> there is software (early tv-out cards, anyway) that modified
>> the "non-interlaced" vga signal so it would look better on a
>> tv screen.
>
> Wow.  They sure filled you full of it at Computer City.
>
> -- 
> Grant
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