Is it possible to subsample an image by deleting data then interpolating to create a blurred image, while keeping the resulting image the same size as the original image?

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Tevin 2023-12-18

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https://ww2.mathworks.cn/matlabcentral/answers/2061837-is-it-possible-to-subsample-an-image-by-deleting-data-then-interpolating-to-create-a-blurred-image

编辑： Walter Roberson 2023-12-19

Is it possible to subsample an image by deleting data then interpolating to create a blurred image, while keeping the resulting image the same size as the original image?

The code I am using below does the subsampling and interpolation but changes the image size. It looks smaller. See a part of my code below.

originalImage = imread(imagePath);
zeroPaddedImage = zeros(size(originalImage), 'like', originalImage);
zeroPaddedImage(:, 1:subsamplingFactor:end) = originalImage(:, 1:subsamplingFactor:end);
blurredImage = imresize(zeroPaddedImage, 1/subsamplingFactor, 'bicubic');

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Matt J 2023-12-18

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https://ww2.mathworks.cn/matlabcentral/answers/2061837-is-it-possible-to-subsample-an-image-by-deleting-data-then-interpolating-to-create-a-blurred-image#answer_1373722

编辑：Matt J 2023-12-19

在 MATLAB Online 中打开

siz=size(originalImage);
tempImage=originalImage( 1:subsamplingFactor:end,  1:subsamplingFactor:end, :);
blurredImage = imresize(tempImage, siz(1:2), 'bicubic');

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Tevin 2023-12-19

在 MATLAB Online 中打开

Images.mat

%Please see a part of my code
% Create a zero-filled image of the same size as the original
siz = size(originalImage);
zeroPaddedImage = zeros(size(originalImage), 'like', originalImage);
zeroPaddedImage(:, 1:factor:end, :) = originalImage(:, 1:factor:end, :);
blurredImage = imresize(zeroPaddedImage, siz(1:2), 'bicubic');

I have attached a file with the original image, the subsampled and the interpolated image. The interpolated image looks like the subsampled one. I want to fill the gaps by interpolating so it seemed like a blurry or noisy image, rather than a having gaps. Can you look at where my code is going wrong?