down sample nearest method

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Gamliel Roos
Gamliel Roos 2019-12-10
评论： Sourav Bairagya 2019-12-18
I want to down sampling a image for this i use the function: imresize(im,0.5,'nearest'). But i don't understand how the nearest interpolation work in this case, i undestand in upsampling but not in downsampling?
Thanks for your answer

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回答（1 个）

Sourav Bairagya
Sourav Bairagya 2019-12-17
The command 'imresize(im,0.5,'nearest')' will first find out the query points i.e. it will map the output image cordinates to the input image coordinate space using the 'scale' provided in the input argument of 'imresize'. Then, using the selected 'method' in the input argument of the function, it will compute the values at those query points. Thus, downsampling is performed.
  2 个评论
Gamliel Roos
Gamliel Roos 2019-12-17
Thanks for your answer but how this 'method' (nearest) work in down sampling?
Sourav Bairagya
Sourav Bairagya 2019-12-18
It will copy the nearest pixel value at the query point. First, it will search horizontally which pixels are nearest to that point. Then, it will search vertically the nearest one among those pixels and copy that value to the desired location.

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