I've always wanted to try building a mosaic, and I set out on Feb-17 to capture the source data for one.
It was not a perfectly clear night, but it was reasonably good. I'd been chased inside by temperatures in the low 30s high 20s (F) the night before (yes Rick, it's not that cold
but my years in So Cal have made my blood thinner). I was using my C-8 and spent the first hour or so collimating the scope. This made a huge difference, I have moved the scope many times and it really needed it.
That being done, I took out my relatively new DMK firewire camera, but it was dead. The computer doesn't see it. (Still in phone tag with Imaging Source on this one.) I still had my ToUCam Pro, so I was able to image.
The images are of Copernicus, taken on Feb-17 about 10pm PST from the Cahuilla Valley in Southern California. That's about 10 miles north of the dome at Mount Palomar, just over 1,000 meters elevation. I created a mosaic of 4 shots, each 200 of the best images from 1200 or so in the original AVI.
I had to turn off the "histogram adjust" setting in Registax since it was creating very different contrast profiles among the images which made the mosaic uneven. The mosaic was created in Photoshop, using the Photomerge process. All other processing was done in PixInsight. I did no sharpening in Registax.
I used Regularized Van Cittert deconvolution, HDR Wavelet Transform, curves, and GREYCStoration noise reduction. The first image has the HDR Wavelet Transform which flattened the overall image; the second does not. I cropped off the flanges of the mosaic because it was creating errors during convolution -- perhaps next time I'll combine to a black background rather than missing data.
I wrote a more
complete description of the processing on my web site.
Larger sized pics are there too.
Thanks for looking.
--Andy
25-February-2008, 04:11 AM
Copernicus Mosaic
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