Re: troubles with matching

[Chris Albertson <chrisalbertson90278@yahoo.com>]

--- Stupendous Man <richmond@a188-l009.rit.edu> wrote: 

>   It may help if I modify the pipeline so that instead of 
> using the brightest N stars from the reference catalog, it instead
> uses 
> a set of N stars which lie between two particular magnitude
> limits.  Unfortunately, we can't constrain the detected stars to
> lie within a particular magnitude limit, because we don't (yet)
> know the zero-point offset between the instrumental magnitudes
> and calibrated magnitudes when we start the matching process :-(

I think you can.  I'd guess that the magnitude zero point says
somewhat constant and I know the image scale and orientation
remains constant.  If we prosess one image clear to the end we
can use the zero point, scale and orientation (and pointing error)
as a starting guess for the next image.  This should greatly speed
up the match process.

For the first image you would use all of the stars not saturated
and above three sigma.  The first image would take longer to match
but you make it up in the next hundred which would go much faster.

I think the current pipeline processes the images independantly
but they were taken in series all with the same camera.  We should
take advantage of this.


=====
Chris Albertson 
  Home:   310-376-1029  chrisalbertson90278@yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson@aero.org

__________________________________________________
Do You Yahoo!?
Yahoo! Greetings - send holiday greetings for Easter, Passover
http://greetings.yahoo.com/