Matching points to a known grid

I am taking a picture of a some screen-printed dots arranged basically
in a grid. I know what the grid of dots is supposed to look like in
advance.

I have a simple program to extract the locations of each dot. However,
it's possible that I could miss a dot or have an extra one or two dots.

SO, I have a list of (x,y) locations of the expected grid positions and
a list of extracted (x,y) locations.

Can anyone recommend an algorithm for best matching up points in the 2
lists?

Thanks.

.

Relevant Pages

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    (comp.databases.ms-access)