Comments on: Spatial transformations: Affine http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/ 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> Sun, 22 Nov 2009 23:12:21 +0000 http://wordpress.org/?v=2.3.1 By: Steve http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-21200 Steve Wed, 29 Oct 2008 23:02:48 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-21200 Maher—You might try using <tt>cpselect</tt> to select pairs of corresponding points, followed by <tt>cp2tform</tt> to infer an affine transformation. Maher—You might try using cpselect to select pairs of corresponding points, followed by cp2tform to infer an affine transformation.

]]> By: Maher http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-21184 Maher Mon, 27 Oct 2008 09:44:27 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-21184 Dear Steve, I am trying to find the similarity degree between historic and modern maps (statistically). I need to convert the coordinates of the modern image to fit that of the old one using Matlab.For example: through affine transformation. Please, advise so. Great Thanks for you. Dear Steve,
I am trying to find the similarity degree between historic and modern maps (statistically). I need to convert the coordinates of the modern image to fit that of the old one using Matlab.For example: through affine transformation.
Please, advise so.
Great Thanks for you.

]]> By: Steve http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-12255 Steve Fri, 19 Oct 2007 11:46:16 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-12255 Eric—What do you mean? Eric—What do you mean?

]]> By: Eric Monse http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-12245 Eric Monse Fri, 19 Oct 2007 09:45:09 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-12245 Can't wait to see Matlab. Can’t wait to see Matlab.

]]> By: Steve http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6735 Steve Wed, 30 May 2007 12:21:14 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6735 Gleb - I'm glad it worked! Gleb - I’m glad it worked!

]]> By: Gleb http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6734 Gleb Tue, 29 May 2007 22:27:27 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6734 Steve, it's exactly what I needed! Thank you again!!! Steve,
it’s exactly what I needed! Thank you again!!!

]]> By: Gleb http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6733 Gleb Tue, 29 May 2007 15:46:22 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6733 Steve, thank you very much! I will try. :) Steve,
thank you very much! I will try. :)

]]> By: Steve http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6732 Steve Tue, 29 May 2007 14:42:30 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6732 Gleb - Your question is a little too vague to answer specifically. Usually people will take three 2-D matrices, treat them as different components of some color space, modify them as desired, concatenate them to form an M-by-N-by-3 array, and then use one of the color space conversion functions to make an RGB image for display. Something like this: <pre> hsv_image = cat(3, H, S, V); rgb_image = hsv2rgb(hsv_image); </pre> Gleb - Your question is a little too vague to answer specifically. Usually people will take three 2-D matrices, treat them as different components of some color space, modify them as desired, concatenate them to form an M-by-N-by-3 array, and then use one of the color space conversion functions to make an RGB image for display. Something like this:

hsv_image = cat(3, H, S, V);
rgb_image = hsv2rgb(hsv_image);
]]> By: Gleb http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6730 Gleb Mon, 28 May 2007 19:28:43 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6730 Steve, I'm not sure whether my question is related to this topic. I have two images, which I need to combine as follows: one image should be represented in pseudocolors (in "hsv" colormap) but the other image should be represented as a value. In other words, the brightness of pixels needs to be modified. Of course, both images are 2D matrices of the same size. I'm quite confused on how to do it... Thank you very much!!! Gleb Steve,
I’m not sure whether my question is related to this topic.
I have two images, which I need to combine as follows: one image should be represented in pseudocolors (in “hsv” colormap) but the other image should be represented as a value. In other words, the brightness of pixels needs to be modified. Of course, both images are 2D matrices of the same size. I’m quite confused on how to do it…
Thank you very much!!!
Gleb

]]> By: Steve http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6723 Steve Tue, 22 May 2007 13:29:56 +0000 http://blogs.mathworks.com/steve/2006/02/07/spatial-transformations-affine/#comment-6723 Mehdi - I don't have any particular suggestions for you. Mehdi - I don’t have any particular suggestions for you.

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