measurements
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Hello
I am attempting to measure the maximum linear length of the x and y axis of free-hand drawn polygons of various shapes using Image J. The only measurement function that I can determine is suitable for this type on analysis is the 'Fit Ellipse' function. My colleague used to own a mac computer and suggests that it was once possible to get a maximum x and maximum y value using NIH for Mac. Is the 'Fit Ellipse' function the best way of doing this? Any help would be greatly appreciated Cheers Ben ------------------------------------------------------------------------ The information contained in this communication is for the use of the individual or entity to whom it is addressed, and may contain information which is the subject of legal privilege and/or copyright. If you have received this communication in error, please notify the sender by return E-Mail and delete the transmission, together with any attachments, from your system. Thank you. ------------------------------------------------------------------------- |
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Ben,
You may be looking for the feret dimension of the object, see Gabriel Landini's excellent software for ImageJ at http://www.dentistry.bham.ac.uk/landinig/software/software.html Can you describe the measurement you expect to get if an isosceles triangle is drawn (base of a, height of b) then rotated and moved arbitrarily in the image. Do you expect the measurements to be invariant of the rotation angle and position? cheers, John Cahill Carlisle MA On 11/16/06, Ben Fitzgibbon <[hidden email]> wrote: > Hello > > > > I am attempting to measure the maximum linear length of the x and y axis > of free-hand drawn polygons of various shapes using Image J. The only > measurement function that I can determine is suitable for this type on > analysis is the 'Fit Ellipse' function. My colleague used to own a mac > computer and suggests that it was once possible to get a maximum x and > maximum y value using NIH for Mac. Is the 'Fit Ellipse' function the > best way of doing this? > > > > Any help would be greatly appreciated > > > > > > Cheers > > > > Ben > > > > > > > > > > > > > > ------------------------------------------------------------------------ > The information contained in this communication is for the use of the > individual or entity to whom it is addressed, and may contain > information which is the subject of legal privilege and/or copyright. > If you have received this communication in error, please notify the > sender by return E-Mail and delete the transmission, together with any > attachments, from your system. Thank you. > ------------------------------------------------------------------------- > |
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In reply to this post by Ben Fitzgibbon
FracLac calculates the maximum span across the convex hull if that would work.
audrey ----- Original Message ---- From: John Cahill <[hidden email]> To: [hidden email] Sent: Friday, November 17, 2006 1:44:03 PM Subject: Re: measurements Ben, You may be looking for the feret dimension of the object, see Gabriel Landini's excellent software for ImageJ at http://www.dentistry.bham.ac.uk/landinig/software/software.html Can you describe the measurement you expect to get if an isosceles triangle is drawn (base of a, height of b) then rotated and moved arbitrarily in the image. Do you expect the measurements to be invariant of the rotation angle and position? cheers, John Cahill Carlisle MA On 11/16/06, Ben Fitzgibbon <[hidden email]> wrote: > Hello > > > > I am attempting to measure the maximum linear length of the x and y axis > of free-hand drawn polygons of various shapes using Image J. The only > measurement function that I can determine is suitable for this type on > analysis is the 'Fit Ellipse' function. My colleague used to own a mac > computer and suggests that it was once possible to get a maximum x and > maximum y value using NIH for Mac. Is the 'Fit Ellipse' function the > best way of doing this? > > > > Any help would be greatly appreciated > > > > > > Cheers > > > > Ben > > > > > > > > > > > > > > ------------------------------------------------------------------------ > The information contained in this communication is for the use of the > individual or entity to whom it is addressed, and may contain > information which is the subject of legal privilege and/or copyright. > If you have received this communication in error, please notify the > sender by return E-Mail and delete the transmission, together with any > attachments, from your system. Thank you. > ------------------------------------------------------------------------- > |
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Thankyou all
The Measure Roi plug in is the one I was looking for. I am digitizing photos of coral colonies to measure growth as increase in area and x/y increase. Thankyou very much for the guidance Ben -----Original Message----- From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of audrey karperien Sent: Saturday, 18 November 2006 10:28 AM To: [hidden email] Subject: Re: measurements FracLac calculates the maximum span across the convex hull if that would work. audrey ----- Original Message ---- From: John Cahill <[hidden email]> To: [hidden email] Sent: Friday, November 17, 2006 1:44:03 PM Subject: Re: measurements Ben, You may be looking for the feret dimension of the object, see Gabriel Landini's excellent software for ImageJ at http://www.dentistry.bham.ac.uk/landinig/software/software.html Can you describe the measurement you expect to get if an isosceles triangle is drawn (base of a, height of b) then rotated and moved arbitrarily in the image. Do you expect the measurements to be invariant of the rotation angle and position? cheers, John Cahill Carlisle MA On 11/16/06, Ben Fitzgibbon <[hidden email]> wrote: > Hello > > > > I am attempting to measure the maximum linear length of the x and y axis > of free-hand drawn polygons of various shapes using Image J. The only > measurement function that I can determine is suitable for this type on > analysis is the 'Fit Ellipse' function. My colleague used to own a mac > computer and suggests that it was once possible to get a maximum x and > maximum y value using NIH for Mac. Is the 'Fit Ellipse' function the > best way of doing this? > > > > Any help would be greatly appreciated > > > > > > Cheers > > > > Ben > > > > > > > > > > > > > > > The information contained in this communication is for the use of > individual or entity to whom it is addressed, and may contain > information which is the subject of legal privilege and/or copyright. > If you have received this communication in error, please notify the > sender by return E-Mail and delete the transmission, together with any > attachments, from your system. Thank you. > ------------------------------------------------------------------------ - > ------------------------------------------------------------------------ The information contained in this communication is for the use of the individual or entity to whom it is addressed, and may contain information which is the subject of legal privilege and/or copyright. If you have received this communication in error, please notify the sender by return E-Mail and delete the transmission, together with any attachments, from your system. Thank you. ------------------------------------------------------------------------- |
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