<div class="gmail_quote">Hi, everyone :<br><br>I encountered a problem when I did a 3D ultrasound calibration. <br><br>First, I used a pen probe as shown in "PenProbe.JPG", and want to calculate its matrix. Then by this matrix, I can calculate the coordinate of the tip when I read the coordinate of the sensor tied on the pen probe. So I put the tip of the pen probe on a fixed point, and record 6 groups of data from the sensor tied on the pen probe when I changed the direction of the pen probe. Then I used another sensor to record the position of that fixed point.<br>
<br>After then, I used the iterative closet point (ICP) method to estimate the parameters of that matrix, the same as the example of "ITK/Examples/Registration/IterativeClosestPoint2.cxx". I set the position of that fixed point as the fixed point, and those 6 groups of data as the moving points, and the other setting are the same as "IterativeClosestPoint2.cxx". Therefore, I can get 6 parameters about x, y, z, and angleX, angleY, angleZ.<br clear="all">
<br>To validate this result, I used the formulas, as shown in "Matrix.jpg", and alpha = angleZ, beta = angleY, gamma = angleX. Then I convert one data of 6 groups by this matrix to get a new coordinate. I think this new coordinate should be near the position of that fixed point, however, my result is different. <br>
<br>I wonder which step I make a mistake. Does anyone have any idae about my problems ?<br><br>I will appreciate for your advice!<br><br>Thank you!<br><span></span><br>-- <br><br> ---------------------<br>Best Regards!<br>
<br>===============================================<br>Rong Xu, Ph.D Student<br>Ohya Lab<br>Graduate School of Global Information
and Telecommunication<br>Studies (GITS), Waseda University<br>1-6-1 Nishi Waseda, Shinjuku-ku,
Tokyo, Japan (¨“169-8050)<br><br>Tel: <a href="tel:%2B81-80-4208-1207" value="+818042081207" target="_blank">+81-80-4208-1207</a><br>E-mail: <a href="mailto:xurong1981@gmail.com" target="_blank">xurong1981@gmail.com</a><br>
<a href="mailto:xurong@fuji.waseda.jp" target="_blank">xurong@fuji.waseda.jp</a><br>
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