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  #1 (permalink)  
Old 06-July-2009, 02:23 AM
Thangalin Thangalin is offline
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Default Crab Nebula

Hello,

During the last six months I have collected high-resolution scans of drawings and photographs of the Crab Nebula, from their original plates or prints, spanning 1844 to 2000, as TIFF images. My main goal is to acquire the best photo from each decade.

I have made a temporary website with low-resolution versions (72 dpi, 400px wide) of these images:
http://davidjarvis.ca/nebula
I would like help rotating and scaling the images. I have tried DeepSkyTracker, IRIS, RegiStax, AstroStack, RegiStar, and AstroArt. I have yet to delve into FreeMat, IRAF (+CL?), ITK (+VTK), or other various APIs to help. (See also: http://en.wikipedia.org/wiki/Image_r...Other_Software)

Essentially what I would like to know is if there is a simple software package that allows the user to select stars in one image, then map them to stars in a second image, followed by having the computer perform a transformation that aligns the two images. The software packages I mentioned do way too much automated star detection which simply does not work with the images I have (i.e., hand-drawn photographs).

Astrophotography software is not a requirement. If there is some software that allows users to select 10 small rectangular areas in one picture that map to 10 small areas in another and have the software do the appropriate transformation (to align the rectangles), that should be fine, too. (The rectangles would just happen to enclose stars.)

Any ideas? (Keep in mind I'm quite new to all this ...)

Thanks in advance!
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Old 06-July-2009, 02:56 AM
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AstroRockHunter AstroRockHunter is online now
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Quote:
Originally Posted by Thangalin View Post
Hello,

During the last six months I have collected high-resolution scans of drawings and photographs of the Crab Nebula, from their original plates or prints, spanning 1844 to 2000, as TIFF images. My main goal is to acquire the best photo from each decade.

I have made a temporary website with low-resolution versions (72 dpi, 400px wide) of these images:
http://davidjarvis.ca/nebula
I would like help rotating and scaling the images. I have tried DeepSkyTracker, IRIS, RegiStax, AstroStack, RegiStar, and AstroArt. I have yet to delve into FreeMat, IRAF (+CL?), ITK (+VTK), or other various APIs to help. (See also: http://en.wikipedia.org/wiki/Image_r...Other_Software)

Essentially what I would like to know is if there is a simple software package that allows the user to select stars in one image, then map them to stars in a second image, followed by having the computer perform a transformation that aligns the two images. The software packages I mentioned do way too much automated star detection which simply does not work with the images I have (i.e., hand-drawn photographs).

Astrophotography software is not a requirement. If there is some software that allows users to select 10 small rectangular areas in one picture that map to 10 small areas in another and have the software do the appropriate transformation (to align the rectangles), that should be fine, too. (The rectangles would just happen to enclose stars.)

Any ideas? (Keep in mind I'm quite new to all this ...)

Thanks in advance!
I think that this is a GREAT idea. The only suggestion that I will give right now is that you MUST list the credits of each picture. To not do so is at best a discourtesy to the imager and a worst could be taken as plagiarism.
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Last edited by AstroRockHunter; 06-July-2009 at 02:57 AM.. Reason: Edited to remove the words "come from".
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Old 06-July-2009, 04:06 AM
Thangalin Thangalin is offline
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The website I put up is temporary -- just for viewers of this thread until I find a viable solution. I have a record of everyone who has helped me, source images, details about the original photographer, and so forth. I will not present high-resolution versions without proper attribution.

Help on finding a way to align the images would be greatly appreciated.
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Old 06-July-2009, 04:48 AM
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Thangalin:

I don't know what to do, but you could try asking Adam Block. His website is:

http://www.caelumobservatory.com/

He is one of the best imagers around and he has set up websites that do what I believe you want. He has an e-mail link on his site that you can use to contact him.

He is usually (always) ready to help people like us with our questions.

Good luck with your site. I look forward to seeing the finished product.
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Old 06-July-2009, 08:37 AM
Thangalin Thangalin is offline
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Thanks, Astro.

I'll give him a try.

A friend told me to try Hugin.

http://hugin.sourceforge.net/

It has a simpler interface and seems to allow me to associate points on two different images. I will contact Adam and get his opinion, too.

Thanks!
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Old 08-July-2009, 12:27 PM
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It's not freeware, but Mira does the best job I've found of letting you click on matching stars, work out the transformation, and applying it to a stack of images. The Mira AL version is the basic, lowest-cost option. (I just noticed that there is a 30-day trial version).
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