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Maximum number of stars to use:
The maximum number of stars to take from the image to be used in the solving process. The stars are
picked in the order of magnitude, brighter/bigger stars first.
The more stars are used, the more calculations need to be made, but larger star counts also improves
the chance of success especially with wide-field images.
Default value is 0, which lets the solver decide based on the number of stars detected in the image.
Minimum field radius (degrees):
The minimum field radius to try, in degrees. The search moves from large field radiuses to smaller
ones, i.e. 8, 4, 2, 1, 0.5 degrees and so on. This is the minimum field radius to try.
The smaller the minimum radius, the more work needs to be done. The amount of work increases
exponentially.
Default value is 0.5. For images that have a smaller field radius, this need to be lowered. There also
needs to be sufficiently high quad densities in the quad database in order for very small field radiuses
to be solvable.
Maximum field radius (degrees):
The maximum field radius to try, in degrees. The search moves from large field radiuses to smaller
ones, i.e. 8, 4, 2, 1, 0.5 degrees and so on. This is the maximum field radius to try.
Default value is 8.
Include lower quad densities:
The catalog star -based quad database has been split into passes, with different quad densities per
square degree. When searching for matches, the algorithm measures the image's quad density and then
tries to use the best available database pass with the quad density as close as possible to the image's.
However it's likely that the densities are somewhere in between two passes. An offset of 1 will include
one lower quad density database quad pass into the search. More passes can be included as well, but it's
usually not very beneficial and it increases the number of calculations that needs to be made.
Default value is 1.
Include higher quad densities:
The catalog star -based quad database has been split into passes, with different quad densities per
square degree. When searching for matches, the algorithm measures the image's quad density and then
tries to use the best available database pass with the quad density as close as possible to the image's.
However it's likely that the densities are somewhere in between two passes. An offset of 1 will include
one higher quad density database quad pass into the search. More passes can be included as well, but
it's usually not very beneficial and it increases the number of calculations that needs to be made.
Default value is 1.
Database quad sampling:
Sampling allows the solver to use less database quads per run when trying to find matches. For example,
with a sampling value of 4 only 1/4 of the quads available in the database are used per run in trying to
find a solution. If a solution is not found with the first 1/4 of the quads, then it moves on to test the
next 1/4 and so on.
Because a smaller number of calculation needs to be made per run, a sampled run is faster and may yield
a result much faster - only a single potential quad match needs to be found in order to trigger a full
matching operation, and if a solution is then found a lot of time has just been saved.
Default value is 6.