XMM-Newton Science Analysis System


ommosaic (ommosaic-2.7.1) [xmmsas_20141104_1833-14.0.0]

Meta Index / Home Page / Algorithm- Sky Images / Initialization (image alignment mode)

Initialization example

Assume that there are 5 images and that after computing the overlap area
fractions the alignment vector stores the following data

    image index i image index j   overlap fraction

 1)       1         2              0.1 
 2)       1         3              0.1
 3)       1         4              0.1
 4)       1         5              0.5  
 5)       2         3              0.1
 6)       2         4              0.6
 7)       2         5              0.1
 8)       3         4              0.7
 9)       3         5              0.6
10)       4         5              0.9



After sorting into decreasing overlap fraction by Alignment class (Second stage)

   image index i image index j   overlap fraction


 1)        4         5             0.9
 2)        3         4             0.7
 3)        2         4             0.6
 4)        3         5             0.6
 5)        1         5             0.5
 6)        1         2             0.1
 7)        1         3             0.1
 8)        1         4             0.1
 9)        2         3             0.1
10)        2         5             0.1


This will then give the order in which two images will be attempted to be aligned.