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dpi reconginze problem

HI ALL:

I  use kinect as my camera;

vuforia defalut DPI is 640 * 480 ;

I changed the DPI to 1920 * 1080 to adapt  Kinect .

(Vuforia\Editor\WebcamProfiles\profiles.xml)

but when I change it , It become untrackable status for my application . app cannot recongize any imaging target or object target!!!

I dont konw which step is wrong~

HELP PLZ ~~~