Posted by
ard on
URL: http://imagej.273.s1.nabble.com/Find-missing-spots-in-a-grid-of-spots-tp5019879p5019968.html
Hi Gabriel,
Unless I grossly misunderstand you, I'm afraid that is not exactly what we
are after, as we are after the perfect grid with all missing dots put back
in and stray blobs removed. This grid is generated by drawing circles in an
empty window, by the way.
Imagine a perfect honeycomb (hexagonal) with a dot on every corner and a dot
in the center of each honeycomb cell. Now erase all edges so only the dots
are left. Then randomly remove some dots. Now degrade each remaining dot a
random number of pixels around the perimeter. Then shift and rotate the
whole image across an arbitrary distance and angle < 30 degrees. Add noise.
Invert the image. Add noise again.
In the cleaned-up image below, which is only 1 degree off vertical, there
are two dots missing (3rd column 9th row and 4th column 8th row; near the
latter is a strayblob, not a dot). Both the missing dots and the stray blob
could easily be identified by an X- and Y projection. Analyze Particles,
with the proper size and circularity will find the most dots correctly, but
of course it will not find the missing dots and it is confused by the stray
dots too.
We are asked to indicate which dot(s) have vanished and which are not dots
but blobs, so as to generate the 'perfect' honeycomb dot pattern again.
<
http://imagej.1557.x6.nabble.com/file/t188556/dots.gif>
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