down sample nearest method

조회 수: 15(최근 30일)
Gamliel Roos
Gamliel Roos 2019년 12월 10일
댓글: Sourav Bairagya 2019년 12월 18일
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


Sourav Bairagya
Sourav Bairagya 2019년 12월 17일
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.
  댓글 수: 2
Sourav Bairagya
Sourav Bairagya 2019년 12월 18일
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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