Hi, <br>well, start reading chapter nine in the <a href="http://www.itk.org/ItkSoftwareGuide.pdf">ITK software guide</a>. <br>Vessel segmentation may not be evident, especially if vessels lack contrast. I'm sure you can find tens of papers on the topic if you look for it on the Internet.<br>
<br>Depending on the nature of the imag, the accuracy you need, and if contrast is present or not, a simple region growing may be enough. And looking at your matrix, simple thresholding or gradient detection (boundary detection) may work.<br>
<br>Good luck,<br>JON HAITZ<br><br><br><br><div class="gmail_quote">On 20 October 2012 16:31, 龍龍 <span dir="ltr"><<a href="mailto:anjingdelonglong@gmail.com" target="_blank">anjingdelonglong@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">HI, all.<br><br>now i have got a matrix standing for a cross-section of a vessel. i want to extract the vessel part. But have no idea what segment method should i use. <br>
<br>14 8 12 17 4 0 0 0 0 0 0 0 0 0 0 0 0 <br>18 16 16 8 0 0 0 0 0 18 97 108 100 78 0 0 0 <br>
5 0 0 0 0 0 0 99 170 170 142 103 97 134 80 0 0 <br>5 0 0 0 0 0 0 99 170 170 142 103 97 134 80 0 0 <br> 1 0 0 0 0 0 92 174 149 149 111 70 122 136 84 0 0 <br>0 0 0 0 0 2 168 164 130 130 84 93 139 130 18 0 0 <br>0 0 0 0 0 124 147 122 99 99 75 99 124 104 0 0 0 <br>
0 0 0 0 0 147 134 104 85 85 86 123 138 43 0 0 0 <br> 0 0 0 0 27 153 139 131 103 103 97 120 93 0 0 0 0 <br>0 0 0 0 27 153 139 131 103 103 97 120 93 0 0 0 0 <br>0 0 0 0 16 151 184 188 139 139 120 77 0 0 0 0 0 <br>0 0 0 0 67 162 193 166 135 135 127 0 0 0 0 0 0 <br>
0 0 0 0 0 44 112 131 74 74 0 0 0 0 0 0 0 <br>0 0 0 0 0 61 126 130 40 40 0 0 0 0 0 9 0 <br>7 0 0 0 0 0 0 0 0 0 0 0 0 0 5 13 0 <br>8 9 0 0 0 0 0 0 0 0 0 0 0 0 5 13 0 <br> 14 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 <br><br><br>
the number stands for the intensity of each pixel. i want a fast and robust segment algorithm to help me to extract the vessel part.<br>THANKS.<span class="HOEnZb"><font color="#888888"><br clear="all"><br>-- <br>Nothing but a MADAO！<br>
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