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Image target cannot be recognized by ios device cameras

Vuforia SDK Version: 6 (Unity 2017.2) - Description with steps to reproduce: My image target couldn't be recognized by ios devices, yet it can be recognized well on the unity editor mode. I have tried different angles, lighting and distance while scanning, still couldn't work. - Development OS (Mac OS X, Windows, Linux): Mac OS X - Mobile OS and Version: 12.3.1, 11.3.1 - Mobile Device Manufacturer and Model name: iPad, iPhone - Do the Vuforia Sample Applications show the same behavior?: yes