I am working on vuforia object recognition and tracking. I want to detect and track a tennis ball using vuforia object recognition. I have made features on the tennis ball using a marker so that object recognizer can detect it. I have scanned the object using vuforia object recognizer and it was detecting more than 150 features, in order to know whether the thing is working or not i have placed a dummy car model on the detected object, but after i develop the app and tried it on a cell phone it isn't detecting the ball. any help will be appreciated.