I have an image having resolution of 256x256,i want to reduce the resolution of image to 128x128,64x64,without using imresize conmmand please help
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Think about it...
If you half the width and height, that means each group of 2x2 pixels becomes one pixel. You average the pixel intensities for each block and set that as your new pixel.
Well, you don't have to average them. You could select one or do any number of statistics on the chunk. But you should start simple.
The rest is just loops and matrix indexing. I'm sure you can cope with that.
you may try the following code. for resolution of 470 X 274
set(gcf,'PaperUnits','inches','PaperPosition',[0 0 4.7 2.74]) print('-dpng', 'filename.png', '-r100')
just change the vector of PaperPosition from [ 0 0 4.7 2.74 ] to something you want
for example [0 0 1.28 1.28] for 128x128 or [0 0 0.64 0.64] for 64X64
t = fft2(YourImage); t(:,end/2+1:end) = ; t(end/2+1:end,:) = ; SmallerImage = ifft2(t);
t = reshape(YourImage, 2, size(YourImage,1)/2, 2, size(YourImage,2)/2, 2); SmallerImage = cast(permute(mean(permute(mean(t,3),[1 2 4 3]),1),[1 2 3],[2 3 1]),class(YourImage));