<br>Hi Suyang,<br><br><br>Can we assume that the defects are shape<br>irregularities in the border of the object ?<br><br>Like holes in an otherwise straight edge ?<br>or bumps in an otherwise straight edge ?<br><br>If so, <br>
you could use Mathematical Morphology<br>filter in order to identify such defect.<br><br>These morphological filters should be run<br>after you have thresholded the image.<br><br>(Although there are implementations <br>available in ITK that will work on grayscale<br>
images).<br><br>You could also consider using filters such<br>as the VotingHoleFilling filter, in order to <br>fill-up those holes or bumps and then <br>subtract the "corrected" image from the<br>thresholded image, effectively highlighting<br>
the defects.<br><br><br>If the defects are not shape irregularities,<br>then....<br>we will need you to post a screen shot of <br>your images in a public web site so that we <br>can take a look at them and give you more <br>
precise advice.<br><br><br> Regards,<br><br><br> Luis<br><br><br>------------------------------------------------------------------------------------------------------<br><div class="gmail_quote">On Mon, Mar 29, 2010 at 5:55 PM, Suyang Mei <span dir="ltr"><<a href="mailto:suyang_mei@yahoo.com">suyang_mei@yahoo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit;" valign="top">
Hi, <br><br> I have a question -<br><br> I have some images including a object, and there are some defects at the edge of the object, the object is bright and the defect is dark, and the background is also dark. if I use threshold approach the dark defect touching the edge of the object will be classified as background, is there any existing ITK filters can be used here to identify those defects? <br>
<br> Thanks.<br><br>Suyang<br></td></tr></tbody></table><br>
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