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Re: Shadow problem

Posted by David Randell on Jun 12, 2008; 9:22am
URL: http://imagej.273.s1.nabble.com/Shadow-problem-tp3695874p3695875.html

On Thursday 12 June 2008 09:15:32 Kashif Zeeshan wrote:

> I have the problem of shadows in the image. When I try to count the
> particles, it considers either the shadows of the particles as their part
> or another particle and thus falsifies the results. Can you kindly help me
> in this regard? How can I overcome this problem? Is there any plugin or
> easy method to remove the shadows from the image?

Are the images grayscale or colour? If the latter and the objects are
reasonably homogeneous in colour you might try identifying and filtering out
the shadows by converting the image into a HSV colour-space, and manipulating
the H and V channels. See this paper for an idea how to approach this
particular problem:

http://ir.lib.u-ryukyu.ac.jp/bitstream/123456789/1489/1/No66p71.pdf

Best regards,
Dave Randell