Steve on Image Processing with MATLAB

Image processing concepts, algorithms, and MATLAB

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Spatial transformations

Posted by Steve Eddins,

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Section 5.11 of Digital Image Processing Using MATLAB covers spatial transformations. I'm interested in expanding this material to a full chapter. I'd like to use this blog to explore these topics and get your feedback about them.

Here's a partial list of concepts to cover:

  • Terminology
  • Types of spatial transformations (affine, for example) and their properties
  • Forward mapping versus inverse mapping
  • Interpolation
  • Aliasing and anti-aliasing

I'd also like to cover interesting features and design issues associated with the Image Processing Toolbox functions imtransform and tformarray, such as:

  • Defining the spatial coordinate systems associated with the input and output images
  • Multidimensional operation
  • Options for handling out-of-bounds pixels
  • What is findbounds and how does imtransform use it?

Finally, there are common questions and points of confusion, such as why applying a translation using imtransform appears not to do anything.

What am I leaving out? Please tell me what you'd like to hear about.

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Spatial transforms
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