The telecommunication operator in my country has coupons that used to recharge the balance
I want to develop an Android application, that with the camera can take the scratched number and recognize and automatic recharge.
I think finding the number box, and latter preform an OCR or a pattern match in because are numbers only
I'm new in computer vision I set the environment and test some opencv ups, but I'm losing witch algorithms or sequence of algorithms may use to achieve that I want Exist segmentation, feature detection, blob detection, ... template match but the image maybe rotates scale because the use of the camera
And I'm lose I wonder if exist one algorithm to find the 4 extreme points of a coupon in one image from here I know how to proceed until the OCR part I don't want the code to do it of course
What I want is a simple clue, answer like you may use X algorithm to have Y result
Thanks and sorry for my english