svn authentification failed

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I am trying to install opencv and I followed the steps mentioned here http://docs.opencv.org/doc/tutorials/introduction/windows_install/windows_install.html when trying to download opencv sources from https://code.ros.org/svn/opencv/trunk get the following error Unable to connect to a repository at URL 'https://code.ros.org/svn/opencv/trunk' OPTIONS of 'https://code.ros.org/svn/opencv/trunk': authorization failed: Could not authenticate to server: rejected Basic challenge (https://code.ros.org)

thank you for any help