how can i rescale image? standard is at the center part

Hi Dayeon,

I have implemented the code based on your request. It rescales an image by a specified ratio, centers the original image within the rescaled image, and visually compares the original and rescaled images for analysis or visualization purposes. Here is the example code snippet,

% Read the original image

originalImage = imread('/MATLAB Drive/IMG_7116.JPG');

% Define the rescale ratio (e.g., 2 for doubling the size)

rescaleRatio = 2;

% Calculate the new dimensions based on the rescale ratio

newHeight = round(size(originalImage, 1) * rescaleRatio);

newWidth = round(size(originalImage, 2) * rescaleRatio);

% Create a new blank image with the new dimensions

rescaledImage = uint8(zeros(newHeight, newWidth, size(originalImage, 3)));

% Calculate the center of the rescaled image

centerX = round(newWidth / 2);

centerY = round(newHeight / 2);

% Calculate the starting and ending points for copying the original image to the center of the rescaled image

startX = max(1, round(centerX - size(originalImage, 2) / 2));

endX = min(newWidth, startX + size(originalImage, 2) - 1);

startY = max(1, round(centerY - size(originalImage, 1) / 2));

endY = min(newHeight, startY + size(originalImage, 1) - 1);

% Copy the original image to the center of the rescaled image

rescaledImage(startY:endY, startX:endX, :) = originalImage;

% Display the original and rescaled images

figure;

subplot(1, 2, 1);

imshow(originalImage);

title('Original Image');

subplot(1, 2, 2);

imshow(rescaledImage);

title('Rescaled Image with Center Standard');

Please see attached.

Feel free to modify the code based on your preferences. I hope this answers your question.