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

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Selva Karna
Selva Karna 2017-6-9
评论： Selva Karna 2017-7-4
How to read and resize and change color image from URL link in our MATLAB commands?

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Gopichandh Danala
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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Gopichandh Danala
Gopichandh Danala 2017-6-13
编辑：Gopichandh Danala 2017-6-13
Are u asking for choosing filename/url_link on runtime even without knowing which URL you want to find or do you just want to check if a URL exists or not?
In the first case, I don't think it's possible for Matlab to go and randomly work as a Google to browse an HTML link.
In the second case, If you have a URL and want to check if its exists or not, this is more practical by try and catch block..
[str,status] = urlread('https://static.pexels.com/photos/14621/Warsaw-at-night-free-license-CC0.jpg');
try
IMG = imread('https://static.pexels.com/photos/14621/Warsaw-at-night-free-license-CC0.jpg');
catch
disp('URL link not available or broken')
end
If you have an idea of what you are looking for like some parameters you can construct the URL like this LINK

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