Comments on: Spatial transformations: Inverse mapping http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/ Steve Eddins manages the Image & Geospatial development team at The MathWorks and coauthored Digital Image Processing Using MATLAB. He writes here about image processing concepts, algorithm implementations, and MATLAB. Sat, 11 Feb 2012 18:27:50 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Steve http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-24005 Steve Fri, 11 Mar 2011 19:41:24 +0000 http://blogs.mathworks.com/steve/?p=55#comment-24005 Esther—Implicit zero padding by default. Esther—Implicit zero padding by default.

]]> By: Esther http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-24003 Esther Fri, 11 Mar 2011 02:43:41 +0000 http://blogs.mathworks.com/steve/?p=55#comment-24003 Hi Steve, I wonder what pad method is being used in imtransform when bicubic or bilinear interpolation method is chosen as in: B = imtrasnform(A, TFORM, INTERP)? Thank you Hi Steve,

I wonder what pad method is being used in imtransform when bicubic or bilinear interpolation method is chosen as in:
B = imtrasnform(A, TFORM, INTERP)?

Thank you

]]> By: Steve http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-21230 Steve Sat, 08 Nov 2008 19:13:01 +0000 http://blogs.mathworks.com/steve/?p=55#comment-21230 Sam—Can you be a little more specific? What is it you want to know that's not covered in this post? Sam—Can you be a little more specific? What is it you want to know that’s not covered in this post?

]]> By: sam http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-21229 sam Sat, 08 Nov 2008 19:01:05 +0000 http://blogs.mathworks.com/steve/?p=55#comment-21229 hello steve, Sam- I'm having trouble understanding Reverse Mapping Could you please explain it in some more detail. thank you very much hello steve,

Sam- I’m having trouble understanding Reverse Mapping Could you please explain it in some more detail.

thank you very much

]]> By: Steve http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-21074 Steve Tue, 16 Sep 2008 11:47:24 +0000 http://blogs.mathworks.com/steve/?p=55#comment-21074 Ramana—There are several relevant functions in the Image Processing Toolbox. See <tt>maketform</tt>, <tt>tformfwd</tt>, <tt>tforminv</tt>, <tt>cp2tform</tt>, and <tt>cpselect</tt>. Ramana—There are several relevant functions in the Image Processing Toolbox. See maketform, tformfwd, tforminv, cp2tform, and cpselect.

]]> By: Ramana Murthy http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-21071 Ramana Murthy Tue, 16 Sep 2008 08:40:31 +0000 http://blogs.mathworks.com/steve/?p=55#comment-21071 Hi steve, I'm encountering a similar problem. With some points in input space and corresponding output space(manually choosing)I try to fit a funtion T. Then using T or T-1, I can obtain mapping for all the points in any way. How to write this in MATLAB code.Any material for pseudo code etc. Thanking you very much, with regards, ramana murthy Hi steve,
I’m encountering a similar problem.
With some points in input space and corresponding output space(manually choosing)I try to fit a funtion T. Then using T or T-1, I can obtain mapping for all the points in any way.
How to write this in MATLAB code.Any material for pseudo code etc.
Thanking you very much,

with regards,
ramana murthy

]]> By: Steve http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-20631 Steve Mon, 21 Apr 2008 14:47:13 +0000 http://blogs.mathworks.com/steve/?p=55#comment-20631 Diego—In that case, the spatial transformation is inferred in the inverse direction (from output space to input space). See <a href="http://blogs.mathworks.com/steve/2006/07/27/spatial-transformations-handling-noninvertible-cases/" rel="nofollow">this post</a>. Diego—In that case, the spatial transformation is inferred in the inverse direction (from output space to input space). See this post.

]]> By: Diego http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-20620 Diego Fri, 18 Apr 2008 19:44:24 +0000 http://blogs.mathworks.com/steve/?p=55#comment-20620 Hi Steve, first of all congratulations for this blog. I would like to know what happen when it is not possible to calculate the inverse spatial transformation T^-1. What I think it is the case in non-linear registration, for example, in small deformation approaches when the deformations are parameterized by a linear combination of continuous basis functions. Hi Steve,

first of all congratulations for this blog. I would like to know what happen when it is not possible to calculate the inverse spatial transformation T^-1. What I think it is the case in non-linear registration, for example, in small deformation approaches when the deformations are parameterized
by a linear combination of continuous basis functions.

]]> By: roman http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-17672 roman Fri, 28 Dec 2007 03:14:48 +0000 http://blogs.mathworks.com/steve/?p=55#comment-17672 Because they always talk about the advantages and disadvantages ever in the texts Because they always talk about the advantages and disadvantages ever in the texts

]]> By: Steve http://blogs.mathworks.com/steve/2006/05/05/spatial-transformations-inverse-mapping/#comment-17579 Steve Wed, 26 Dec 2007 14:47:48 +0000 http://blogs.mathworks.com/steve/?p=55#comment-17579 Roman—I'll add it to my list of possible blog topics. Why are you interested? Roman—I’ll add it to my list of possible blog topics. Why are you interested?

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