Dong Cui Dongbing Gu Hua Cai Junxi Sun License plate detection algorithm based on gentle AdaBoost algorithm with a cascade structure. 1962-1966 2009 ROBIO https://doi.org/10.1109/ROBIO.2009.5420532 conf/robio/2009 db/conf/robio/robio2009.html#CuiGCS09