Issue in Multiple Card detection

[rajatmohanty]

Right now this application is working fine, if we kept only 1 reference image but if we have multiple reference images, then it is not working properly.

Scenario : if i have card1, card2, card3 and i try to scan one by one , image detection is working properly. Now once i finished scanning of card3, if i scanned card 1 again, application didn't show anything.Now it is able to scan card 3 only.