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image resampling

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image resampling

by Omer Demirkaya

 

15 Dec 2008 (Updated 06 Sep 2010)

This is a simple function that resamples the image at a different pixel size

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Description

function nimg = imresample(oldpixsize,img,newpixsize,intmethod)

% This function resamples the images at the new grid points
% defined by the new pixel sizes. It assumes that intensities are
% defined at pixel centers
%
% img : original image to be resampled
% nimg : newly sampled image
% oldpixsize : a vector of the form [xpixsize, ypixsize]
% for the original image, e.g., [0.5,0.5]
% newpixsize : is a vector of the form [xpixsize, ypixsize]
% for the new image, e.g., [0.2,0.2]
% intmethod: same as interp2
% 'nearest' - nearest neighbor
% 'linear' - bilinear
% 'cubic' - bicubic
% 'spline' - spline

% Example:
%
% % Create a 2D gaussian function
% H = fspecial('gaussian',[31,31],5);
% % Resample it at a smaller pixel size
% NH = imresample([1,1],H,[0.2,0.2],'spline');
% figure;subplot(211);imshow(H,[]);title('Original');
% subplot(212);imshow(NH,[]);
% title('Resampled using spline interplolation');

MATLAB release MATLAB 7.1.0 (R14SP3)
Other requirements it uses only meshgrid and interp2 functions
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Comments and Ratings (5)
19 Jan 2009 kranthi kumar  
12 May 2009 Cris Luengo

There's no m-file, only a JPG.

28 May 2009 Fernando Díaz

interesting

25 Jul 2010 Alasdair

Really useful thanks

08 Nov 2010 David Jessop

Very useful. Neatly combines the two functions.

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Updates
10 May 2009

I just added an example image. The image is kindly provided by William Samson and a nice example to show resampling.

13 May 2009

It is just reuploading nothing new.

06 Sep 2010

It is modified so it can resample multispectral (e.g., color) images.

Tag Activity for this File
Tag Applied By Date/Time
image processing Cristina McIntire 15 Dec 2008 15:47:18
function Cristina McIntire 15 Dec 2008 15:47:24
pixel Cristina McIntire 15 Dec 2008 15:47:37
resampling Omer Demirkaya 15 Dec 2008 15:47:40
image processing Omer Demirkaya 15 Dec 2008 15:47:40
image processing Mark 18 Aug 2009 13:43:45

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