MATLAB: How to read and resize and change color image from URL link in our MATLAB commands

computer visionimage processingMATLAB

How to read and resize and change color image from URL link in our MATLAB commands?

Best Answer

I am assuming a few things here and you can modify it to suit your requirement

% read image from url (I took  a random  image on internet)..
[url_img, map] = imread('https://static.pexels.com/photos/14621/Warsaw-at-night-free-license-CC0.jpg');
figure, imshow(url_img), title('Image from url')
% resize it..
resized_img1 = imresize(url_img, 0.2); % resize by a factor here 0.2
resized_img2 = imresize(url_img, [600 500]); % resize to a specifiv dimensions
% there are many ways of interpolation to perform resizing 
resized_img3 = imresize(url_img, 0.2,'method','nearest'); % rsize by a specific interpolation method
figure, imshow(resized_img1), title('Resized image')
% change color did you mean from RGB to grayscale 
gray_img = rgb2gray(resized_img1);
figure, imshow(gray_img), title ('Grayscale image')

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MATLAB: Cretae a video from Images using WriterObj

Please see doc page for VideoWriter.

MATLAB: Is it possible to resize a region in a grayscale image

The steps for this is to extract the largest Blob, resize it as per requirement, again map it back to the original image to increase the size of it.

img = imread('blobDilate.jpg');
img = rgb2gray(img);
img(img < 50) = 0;
[rows, cols] = size(img);
figure, imshow(img), title('Original Image');
% Get the max Blob
largestBlob = bwareafilt(logical(img), 1);
figure, imshow(largestBlob)
% increase the size  [+50, +50]of the Blob and remove the added rows, cols
resizeImg = imresize(largestBlob, [rows + 50, cols + 50]); % You can change this according your requirement
% remove added rows, cols
removeRows = [1:25, size(resizeImg,1)-24:size(resizeImg,1)];
removeCols = [1:25, size(resizeImg,2)-24:size(resizeImg,2)];
resizeImg(removeRows,:) = [];
resizeImg(:,removeCols) = [];
figure, imshow(resizeImg)
% New Blob Area
props = regionprops(logical(resizeImg),'Area');
resizedBlobArea = [props.Area];
fprintf('%s %d\n', 'newResizedBlobArea: ', resizedBlobArea)
% final Image
finalImg = logical(img + uint8(resizeImg));
figure, imshow(finalImg), title('Largest Blob resized Image')

Best Answer

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MATLAB: Cretae a video from Images using WriterObj

MATLAB: Is it possible to resize a region in a grayscale image

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