Posted by
Wu, Yuhong on
Jul 22, 2008; 10:07pm
URL: http://imagej.273.s1.nabble.com/Particle-Analyzer-tp3695538.html
Dear All,
I am a new user of ImageJ. We have some images of a grey background
(base material) and dark grey specks (contaminants) that we want to do
image analysis. The first step I have been doing is to use the Finding
maxima function to count the number of specks, which works great. Now
one step further, in addition to the numbers, I'd like to analyze the
size of the particles and ideally get a distribution of the size.
However, the particle analyzer only deals with a binary image. And I
don't really know how you could use finding maxima to find the particles
first and then binarize the image so each local pixel group of maxima is
counted as one speck.
Another question is, I tried to binarize the image directly (which picks
up many unwanted background noise as black specks), however, the
particle analyzer gives a measurement of E-5 pixel^2 as the average
particle size. This does not seem right. What did I do wrong?
The image is a scanned image with 600 or 1200 dpi resolution. The link
to a sample pix is:
http://picasaweb.google.com/yuhongwuspecial/BlackSpeckThanks a lot for any information or input!
Yuhong
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