Re: Why 1080i?

Some fragments on the topic of resolution.

On 19 Aug 2005 18:11:27 GMT, phil-news-nospam@xxxxxxxx wrote:

>| That set can't show 1920x1080 at full resolution...even their spec of 800
>| lines of horizontal resolution shows that...you need 1080 TVL to be able
>| to display all 1920x1080 pixels. ...
....
>He calls this "resolution" here, yet it wants to be critical of others
>for using that same term for the same purpose:
....

>| Resolution is measured along a line or over an area. You know: DPI (dots
>| per inch) PPI (pixels per inch) LPOI (line pairs per inch), arc-seconds
>| of resolving power, circle of confusion ...

Resolution along a line is by my understanding the same parameter
whether it is expressed "per inch", or by "per image side".
A camera, for example can of course specify resolution "per inch" of
its image sensor but then you need to know the size and optics etc to
calculate the resolution "per image side" that is easier to relate to.

I think the same applies to a display. The size must be known to
calculate back and forth between resolution "per inch" and resolution
"per image side".
The parameter is still the same but expressed in a different unit.
The common praxis is that when the unit is left out it means "per
image side"

The method of expressing the resolution in "Lines of resolution" where
the unit "per image side" has been used a very long time.

Then there is a more difficult matter to understand what "Lines of
resolution" means.
If I understand correctly, for optics and believe also for displays
and in general for video, such a measurement uses a line pattern of
black and white lines and the figure specifies how many of these can
be displayed per image side at the point where the contrast has
decreased a certain percentage.
/Jan
.

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