Image distortion

Posted by Macdonald Iain Mr (ENV) on Apr 20, 2009; 3:19pm
URL: http://imagej.273.s1.nabble.com/Image-distortion-tp3692838.html

Dear ImageJ users,

 

I plan to use ImageJ for particle size analysis and for particle
tracking of irregular shaped particles. In order to test my system I
have taken an image of a fixed frequency grid distortion target. The
grid distortion target is made up of 62.5 microns diameter dots at  125
microns spacing. The grid has dots in both directions.

 

The image after thresholding shows that distortion is occurring (the
dots appear larger with distance from the center of the image). Could
anyone please help me with either some advice on how this distortion can
be accounted for, or even better provide me with some code which would
correct this distortion.

 

The plan is to apply the distortion correction to subsequent images of
irregular shaped particles, from which size and other information can be
obtained.

 

Thanks in advance

 

Iain MacDonald