Test your OpenCV HAAR based classifiers on the go! make sure to download the OpenCV manager if it doesn't download with the application. paste the URL of a plain text XML file into the text box and hit the button! once the link text disappears you can the click on "my_classifier" from the classifier selection menu. This menu is obtained by clicking on the three dots at the bottom of the screen. make sure to hold the phone horizontally as if you were taking a landscape photo. This is necessary for the classifiers to work properly.