(8515) Corvan

Thanks folks :oops:

Seanie - the sequence is just short of an hour from start frame to end frame. Some frames in the middle were no good and were thrown out

Gordon - I'd like to but its going to be along term project. Moseley is very dim until May/June and (6860) Sims is even fainter.

We'll see

Cheers again

Dave

Superb piece of work Dave, two asteroids in three days, where do your talents end? Congratulations again!

John(9929).

cool Dave,
Thats a nice piece of imaging.!!

Thats amazing Dave

Im very impressed!!!!

Hi Dave,

I thought I would give you a nice little surprise by doing a bit of a clean-up job on your last asteroid animation. I had read the article in Kiss&Tel by Sean Walker on “Deep-Sky Astrophotography 2005” (March 2006, pg 103) about how to remove noise and scratches from old photos and images.

The technique is pretty simple, and goes like this: You have two images of the same object. One has scratches or other noise on it and the other is somewhat better… or at least shows a different pattern of noise. You subtract the clean image from the noisy one and end up with a third image which contains only the noise, or the difference between the two images. You then subtract this ‘noise’ image from your original bad image and hey-presto… you have a totally clean image!

I did this with your animation. I got the best and worst frames (6 and 1) and did the deed. The result was spectacular – *no* noise!!!! I was well pleased with my efforts and decided to do the same for another 5 or 6 frames before the blindingly obvious hit me smack between the eyes! This technique removes everything that is *different* between any two images. Well, the bluming asteroid is *moving* and so of course it appears different in every image. The result is that the asteroid vanishes from an otherwise beautifully cleaned up animation!!! Doh doh doh doh doh!!!!!!!

Here’s a link to the fruits of my labours! No-Asteroid.jpg. It just contains 7 frames or so of the original 20.

www.irishastronomy.org/user_resources/fi...d%20(7%20frames).gif

Phil.

PS – Just a thought, but if one was *not* hunting down asteroids, this technique could be used to effectively remove all the effects of atmospheric distortion and scintillation. You would need to write a piece of dedicated software or a macro for PaintShop/Photoshop to take each frame of a movie and apply the noise difference from each of the other frames in turn before moving on to the next frame (1&2, 1&3, 1&4, 1&5…. 2&3, 2&4, 2&5… 3&4, 3&5, 3&6… etc.)

Anybody care to comment… or have I just reinvented the wheel? J

I've just surprised myself! The asteroid isn't entirely gone in my animation. It just doesn't show much motion over the seven frames! I might just continue playing with this and see what I get back. I'm away from home until Thursday, so don't hold your breath!

Phil.