Possible error on a calibration movie?

Mogwai · Post by **Mogwai** » Wed Aug 02, 2006 4:13 pm

Hello,

I do have a doubt regarding the following calibration movie:

I did check it thoroughly and could not find any track, so I hit the "No Track" button. My count of "Calibration movies answered incorrectly" then changed from 0 to 1. I pressed the "back" button of my browser to check it out again and again and I still can not find a single track. Where is it?

As you can see, the movie # is 11124B. Could you please check it out?

Thanks,

Mogwai

icebike · Post by **icebike** » Thu Aug 03, 2006 2:57 am

That one is pretty odd.

The only suspicious area I see in that image is that most of the dust seems to be on the surface, except for one at the bottom, which comes into focus much deeper than all the rest.

Here's the image:
http://stardustathome.ssl.berkeley.edu/ ... e_id=11124

The dot in question is about an inch and a half in from the right., and a half inch up from the bottom

sutur · Post by **sutur** » Thu Aug 03, 2006 3:31 am

i think i got the same object and also anwered it wrongly. it seems to be something in the lower left corner. it is visible all the time but very blury. when you focus down until the end you realize that is becomes slightly sharper that the other particles on the surface. it has to be a particle which almost didnt penetrate the aerogel and almosts rests on the surface. however this one is very different from the calibration movies i've seen until now.
don't get me wrong - it may be an enterely different movie i'm talking about. i didn't remember its number but only it's shape and i did so because it destroyed my perfect stats

Sackleinen · Post by **Sackleinen** » Thu Aug 03, 2006 6:29 am

This happenend to me 3 times.
I haven`t seen any dust, klicked on No Track and my sensitivity dropped.
As i understand sensitivity, to actually have it lowered, you have to mark a track on an image which actually hasn`t got any.

I would be interested if someone else got this "problem" more than once. Or is it just me getting something wrong...

Zsinj · Post by **Zsinj** » Thu Aug 03, 2006 7:01 am

11124: I see a small track about 10 microns from the right, and about 50 microns from the bottom of that movie.

Sackleinen · Post by **Sackleinen** » Thu Aug 03, 2006 7:05 am

It happend again
This time i went back to look at the movie and still found no track.
It was movie Nr 10921B.
If someone from stardust is reading this, it would be great if you could have a look into this.

Before that i thought i knew what to do .....

KarMann · Post by **KarMann** » Thu Aug 03, 2006 11:54 am

Sackleinen: No, when you click on a calibration image which doesn't have tracks, that lowers your "specificity". Your "sensitivity" is indeed reduced by failing to mark tracks in calibration image.
The fuzzy area, so to speak, is what happens if you mark a calibration movie as "bad focus", which is probably why most (all?) of them aren't.

Henri Valta · Post by **Henri Valta** » Thu Aug 03, 2006 1:51 pm

I think it happened here too. Clicked no track on calibration movie 9152A and my incorrectly answered count increased. I went back to that movie and can't still find any track there.

Here's the actual last frame:

Would be great if there was a page that showed every calibration movie that has been answered incorrectly. Strange...

-Henri

Henri Valta · Post by **Henri Valta** » Thu Aug 03, 2006 2:03 pm

Now something is definitely wrong

My bad answer score just keeps increasing

According to the test, these two movies do NOT have any tracks!
The tracks are very clearly visible when you view the movie

If I understand correctly, these should be the same movies

http://128.32.13.178/myevents_viewer.php?movie_id=10507
http://128.32.13.178/myevents_viewer.php?movie_id=10717
These look completely different!!

What's happening???

-Henri

dainenyu · Post by **dainenyu** » Thu Aug 03, 2006 6:23 pm

CM 10516A has a clear particle track, which I marked as such. But my score decreased and my incorrect guesses value went up. Is this issue at least being looked into?

Edit: fixed typo

Post by **annaz** » Thu Aug 03, 2006 6:52 pm

dainenyu wrote:CM 10516A has a clear particle track, which I marked as such. But my score decreased and my incorrect guesses value went up. Is this issue at least being looked into?

Has this happened again?

Blarrrg · Post by **Blarrrg** » Thu Aug 03, 2006 7:28 pm

I seem to have had around 3 glaringly obvious tracks in calibration movies marked wrong as well. Buggy =\

tomjturner · Post by **tomjturner** » Fri Aug 04, 2006 5:59 am

I've noticed that sometimes I click on a picture and I don't get the pop up window that asks me, "Do ya think ya found something?" When I don't get that window, that's usually when the software marks me wrong.

~ Tom

cthiker · Post by **cthiker** » Fri Aug 04, 2006 6:37 am

tomjturner wrote:I've noticed that sometimes I click on a picture and I don't get the pop up window that asks me, "Do ya think ya found something?"

I know it sounds silly, but did you check the pop-up blocker on your browser? Had something similar happen to me - if you're using IE you can add the site "stardustathome.ssl.berkeley.edu" to the Allowed list and you shouldn't have any problems.

Hope that helps!!

yakmin1967 · Post by **yakmin1967** » Fri Aug 04, 2006 9:04 am

I've had problems recently with calibrations vids, after about 140 correctly answered it claims I'd incorrectly identified a (glaringly obvious) track. Then on the very next movie, also a calibration, it claims I missed one, which I'm pretty sure I didn't.

Hardly the end of the world, but the proximity of the two events suggests a bug.