MATLAB: How i can do sub-sampling for an image with factor 4

Question

to perform sub-sampling using matlab

Answer 1

hi ,

you can use the function " downsample" twice ,

example :

 I=imread('circuit.tif');
 J=downsample(I,4);
 J=downsample(J',4)';
 whos I J
 imshow(J)
 figure, imshow(I)

Size(I)= 4² * Size(J) .