hi, can you give me an idea on what are the principles behind electronic-thumb mark reader? please help me, i need it badly on my thesis. i'm an ECE student BTW.. i'm planning to make a fare-counter with the use of each thumbmark of passengers.. i guess no one has made it yet... thanks... ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)