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

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

[Gopichandh Danala]

Can you explain it little clearly, your question can be assumed in many possible ways?

Answer 1

[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')

[Selva Karna]

Thank you Gopichandh Danala , but how can find that image name strord in HTML, how can check that file name in from HTML?

[Gopichandh Danala]

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

[Selva Karna]

Thank you Gopichandh Danala , how to read dll API from our MATLAB script ? can you explain?