Comments on: Image visualization using transparency http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/ Steve Eddins manages the Image & Geospatial development team at <a href="http://www.mathworks.com/">The MathWorks</a> and coauthored <a href="http://www.mathworks.com/support/books/book5291.html?category=-1&language=-1">Digital Image Processing Using MATLAB</a>. He writes here about image processing concepts, algorithm implementations, and MATLAB.<br><br><img> Mon, 23 Nov 2009 01:37:12 +0000 http://wordpress.org/?v=2.3.1 By: Steve http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22357 Steve Mon, 16 Nov 2009 15:35:32 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22357 Abc—I don't know how to distinguish the faces. You might try posting your question in the <a href="http://www.mathworks.com/matlabcentral/newsreader/" rel="nofollow">MATLAB newsgroup</a>. Abc—I don’t know how to distinguish the faces. You might try posting your question in the MATLAB newsgroup.

]]> By: abc http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22346 abc Sat, 14 Nov 2009 23:55:12 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22346 Hi, i am successful in finding the total surface area, but i am not able to differentiate the out faces from inner faces ? thanks Hi,
i am successful in finding the total surface area, but i am not able to differentiate the out faces from inner faces ?

thanks

]]> By: abc http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22345 abc Sat, 14 Nov 2009 16:32:19 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22345 Hi Steve, Thanks for all your previous inputs. i have another problem. i have a volume similar to as shown in this link. http://www.mathworks.se/products/matlab/demos.html?file=/products/demos/shipping/matlab/transpdemo.html When i using the alpha a value to 0.3 to visualise the inner structure similar to that in the above link . Now I want to calculate the surface area of that inner structure ONLY. Is that possible, and how do i go about finding it. Thanks a lot Hi Steve, Thanks for all your previous inputs. i have another problem. i have a volume similar to as shown in this link.

http://www.mathworks.se/products/matlab/demos.html?file=/products/demos/shipping/matlab/transpdemo.html

When i using the alpha a value to 0.3 to visualise the inner structure similar to that in the above link . Now I want to calculate the surface area of that inner structure ONLY. Is that possible, and how do i go about finding it.

Thanks a lot

]]> By: Steve http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22179 Steve Mon, 05 Oct 2009 14:55:15 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22179 Abc—You could try varying the display range for <tt>I_CT</tt> and also the <tt>'AlphaData'</tt> parameter. Abc—You could try varying the display range for I_CT and also the ‘AlphaData’ parameter.

]]> By: abc http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22169 abc Sun, 04 Oct 2009 03:26:38 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22169 Hi again, i could successfully show PET and CT image in 2 different axes in one figure, but still having difficulty seeing the background CT image after overlaying them. please help. Thanks in advance Hi again, i could successfully show PET and CT image in 2 different axes in one figure, but still having difficulty seeing the background CT image after overlaying them. please help. Thanks in advance

]]> By: abc http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22168 abc Sun, 04 Oct 2009 00:47:31 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-22168 Hi Steve, Thanks for all your helpful tutorials. I have a problem trying to overlay a PET image with gray colormap onto a CT image with hot colormap. My data set is unit16. I am SUCCESSFULLY able to overlay the images but the background CT image is VERY unclear/dark (hardly visible). My code looks like this.... Kindly advise I_CT = Load CT_IMAGE; imshow(I_CT,'displayrange',[]); colormap(gray) I_PET = Load PET_IMAGE; hold on imshow(I_PET,'displayrange',[]); colormap(hot) set(I_PET_h,'alphadata',0.5) hold off Hi Steve,
Thanks for all your helpful tutorials. I have a problem trying to overlay a PET image with gray colormap onto a CT image with hot colormap. My data set is unit16. I am SUCCESSFULLY able to overlay the images but the background CT image is VERY unclear/dark (hardly visible). My code looks like this…. Kindly advise

I_CT = Load CT_IMAGE;
imshow(I_CT,’displayrange’,[]); colormap(gray)
I_PET = Load PET_IMAGE;
hold on
imshow(I_PET,’displayrange’,[]); colormap(hot)
set(I_PET_h,’alphadata’,0.5)
hold off

]]> By: Steve http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-21489 Steve Wed, 18 Feb 2009 02:23:37 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-21489 DP—Check out the <a href="http://www.mathworks.com/products/image/demos.html" rel="nofollow">segmentation demos</a> in the Image Processing Toolbox. DP—Check out the segmentation demos in the Image Processing Toolbox.

]]> By: DP http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-21479 DP Tue, 17 Feb 2009 15:33:15 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-21479 Hi Steve, As you shown in your example above you have connected two objects on the image, i want to do the opposite, can we seperate the connected two or more objects, in the image? thanks sincerely DP Hi Steve,
As you shown in your example above you have connected two objects on the image, i want to do the opposite, can we seperate the connected two or more objects, in the image?
thanks
sincerely
DP

]]> By: Steve http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-21162 Steve Wed, 15 Oct 2008 19:51:04 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-21162 Cara—You can use your elevation data as a texture map on a flat surface object. You might want to take a look at the <a href="http://www.mathworks.com/access/helpdesk/help/techdoc/visualize/f0-18164.html#f0-9250" rel="nofollow">texture mapping section</a> in the MATLAB 3-D visualization doc, or at the doc for surface properties. Cara—You can use your elevation data as a texture map on a flat surface object. You might want to take a look at the texture mapping section in the MATLAB 3-D visualization doc, or at the doc for surface properties.

]]> By: Cara http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-21152 Cara Mon, 13 Oct 2008 03:45:52 +0000 http://blogs.mathworks.com/steve/2008/08/20/image-visualization-using-transparency/#comment-21152 Hi. Sorry for the confusion. I would like to produce an image with a transparency similar to what you have done here. Except I would to fill the patches with data from another image. For example, I would like to make a transparency made of patches, where the patches are filled with elevation data. I would like to then overlay the patch transparency onto another image. cara Hi.

Sorry for the confusion. I would like to produce an image with a transparency similar to what you have done here. Except I would to fill the patches with data from another image. For example, I would like to make a transparency made of patches, where the patches are filled with elevation data. I would like to then overlay the patch transparency onto another image.

cara

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