In the Pyramids function, I build the Gaussian pyramid by keep appling Gaussian filter and down sampling the image. Each layer of the lapacian pyramids was obatained by calculating the difference of each bluring process and then added 0.5 intensity so that I can still store it as image. I set the Gaussian filter size as 60/N and the sigma as 20/N. I think 1.5 std range should be enough to capture most information and bigger size didn't give notable improvement. In the hybrid image function, I combine the bottom of the first image(low pass) with the top of the second image(high pass). The default N is 7 and the default cutoff is 2. For me, cutoff 3 would force me to stand very far(or shrink the image to very small) to ignore the high frequency part.
The first three images are made of the sources images in the data folder.
The source images of the first three following images are from the Star Walk app in my Ipad. Since Star walk can provide the same sky with or without the constellation mark,the source images are in perfect alignment. The idea is to put sky and the illustraion of constellation into a hybrid image. The last one come from the screenshot of 1994 movie Lion King (which just release an HD version a few days ago). I combine the image of the dead old king with the sky background used in one of the previous image.
Constellation Puppis Click here to see the source images
Camelopardalis Click here to see the source images
Apus Click here to see the source images
King in the Heaven Click here to see the source images
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