imresize with bicubic DOWNsampling

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Eddy Ilg
Eddy Ilg 2015-8-5
评论： Li Yinghuan 2022-6-27
Dear MATLAB users,
imresize offers 'bilinear' and 'bicubic' methods for resizing images. For upsampling it is clear that these are interpolation methods that use 2x2 or 4x4 neighborhoods to establish a surface and sample at the new location.
However, for downsampling the neighborhoods need to be larger, i.e. a filter needs to be applied. I don't understand what 'bilinear' and 'bicubic' should be in this context and I cannot find a description anywhere. Could you explain or point me to the right documentation?
Best,
Eddy
  1 个评论
T.
T. 2019-8-13
4 years later and the question still remains! Having an input with range [0 ... 255] one example result for scale = 0.25 is in the range [-3 ... 66]. What is computed inside this function?

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回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2019-8-14
Please look here (Slide Nos: 30 to 36)
  1 个评论
Li Yinghuan
Li Yinghuan 2022-6-27
Thank you for your PPT, I had saw the contain, that (Slide Nos: 30 to 36) may displays the averaging down-sample method, but haven't the "bicubic" down-sample method.Could you point me the related documentation?

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