mg262
29th August 2005, 11:04
http://bigwww.epfl.ch/publications/thevenaz9901.pdf
Comprehensive, at least for linear separable methods.* Be prepared for some maths.
*Linear here does not mean bilinear... the former is with respect to the space of images and the latter with respect to x and y. See notes below.
www.cs.utexas.edu/users/billmark/teach/cs384g-04-fall/lectures/mitchell/Mitchell.pdf
Original paper on the Bicubic method.
Notes
Separable simply means that the horizontal and vertical resampling steps can be done separately -- first you stretch horizontally and then vertically (or vice versa).
Linear is a very general mathematical concept meaning (broadly) that each output value is a weighted sum of input values.
Most methods stand only used, including nearest-neighbour, bilinear and Lanczos, are both separable and linear.
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I originally started this post because I found that the first document linked to was extremely useful... then I had real trouble finding the bicubic formula, so I added the second link; there are more things I would like to link to. I hope no one minds a post this directionless or unanswerable -- I will (re)move it if it seems inappropriate.
Comprehensive, at least for linear separable methods.* Be prepared for some maths.
*Linear here does not mean bilinear... the former is with respect to the space of images and the latter with respect to x and y. See notes below.
www.cs.utexas.edu/users/billmark/teach/cs384g-04-fall/lectures/mitchell/Mitchell.pdf
Original paper on the Bicubic method.
Notes
Separable simply means that the horizontal and vertical resampling steps can be done separately -- first you stretch horizontally and then vertically (or vice versa).
Linear is a very general mathematical concept meaning (broadly) that each output value is a weighted sum of input values.
Most methods stand only used, including nearest-neighbour, bilinear and Lanczos, are both separable and linear.
________________________________________________________
I originally started this post because I found that the first document linked to was extremely useful... then I had real trouble finding the bicubic formula, so I added the second link; there are more things I would like to link to. I hope no one minds a post this directionless or unanswerable -- I will (re)move it if it seems inappropriate.