Vision and Around

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Image Transformations Done Right in Matlab

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Though simple and basic, spatial (geometric) transformations in image processing involve lots of subtleties - neglecting these will probably return you awkward results. These subtleties include but are not limited to (esp. in Matlab)

  • Convention in transformation matrices
  • Convention in coordinate axes
  • Position of the input image in the source plane
  • Bounding box calculation
  • Visible region calculation

Steve  Eddins, a software engineer specialized in image processing, has a series of blog articles devoted to these issues.  He has also contributed a new chapter in the 2nd edition of the classic “Digital image processing using Matlab” (Chapter 6: Geometric Transformations and Image Registration)

Steve on Image Processing

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