[FMO] Re: Stardust@home experiences
- From: "Tavi Greiner" <tavianne@xxxxxxxx>
- To: <fmo@xxxxxxxxxxxxx>
- Date: Thu, 3 Aug 2006 17:47:49 -0400 (EDT)
Rob,
Thank you for your communication on this project. I think any conversation
is beneficial both to list readers that are reviewers and to the project
itself. And I hope I wont ware on your patience these initial days.
I know exactly what you mean now regarding the bottom-focus movies - thank
you for exlaining that. Yes, I had several of those myself and I marked
them as bad focus.
There are a very few slides that do somehow seem backwards to me. The next
time I get one, I'll pay more attention to its specific characteristics.
At any rate, I marked them as bad focus because ultimately, they are.
There are also those movies wherein various quadrants are sharply focused
at various levels, yet the whole slide is ultimately and thoroughly
reviewable. Have you noticed these? Are these actually varying levels of
particle entrenchment (sp) - are the overall project conditions such that
this would happen? I dont recall that any of these particular slides
showed any signs of real tracks.
I am confused about one of your statements. What do you mean they tell us
when we have a test movie? Do you mean simply by the movies' familiarity
or is there some text of note somewhere that I'm missing?
I'm tiring of the calibration movies. Beyond my initial poor start with
the slow server (mis-labeling four!), I've had no errors. I think those
should be virtually eliminated beyond a certain error-free viewing point.
Have you noticed any change in ratio with your 700 views?
When you count all the calibration movies being viewed over and again,
that's a lot of time that could be spent reviewing Stardust slides. On the
other hand, if those are eliminated from our viewing time, the project
will end that much sooner - and I'll be disappointed when that day comes.
Thanks so much,
Tavi
_____________________________________________________________________
Matson, Robert said:
> Hi All,
>
> Some comments on other members comments:
>
> Marco:
>
> "* I had a number of movies where the sharp surface focus was way at
> the bottom of the bar. I reported them as "bad focus" but wonder
> whether these were actually movies with the image sequence the wrong
> way around.
>
> Tavi wrote:
>
>> Marco, I agree. I suspect those movies with the sharp focus at the
> bottom
>> were actually reversed or inverted sequences.
>
> No, it just means the range of focus was bad. I've reviewed close to
> 700
> real movies, and all of them had deepest focus at the bottom. One way
> to tell -- when the focus point is above the tile surface, tile
> irregularities/dust/etc. can appear white in the center, dark on the
> edges. When focus is below the surface (e.g. further from the
> microscope),
> the white centers do not occur. In other words, out-of-focus blur is
> assymmetric. So if the "best focus" appears at the bottom of the
> slider,
> I'd mark the movie as "bad focus".
>
> One pet peeve on the calibration movies is that after you've reviewed a
> hundred or more movies, you're never going to get one of these
> wrong. They're too recognizable since there are so few of them.
> And even if they were hard to distinguish from real movies, they TELL
> you when you've got a test movie, thus defeating the purpose of
> blind testing! (Most people probably don't notice this, fortunately,
> but for anyone with a count above 100 the specificity and sensitivity
> numbers no longer mean anything.) --Rob
>
>
>
>
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