Billet characters location in the complex scene

Locating the characters accurately is the primary and critical step of the billet characters recognition. To some ingredients of billet images in the production line, such as bad scene, complex illumination, high noise interference and unfixed position of billet characters in photos, which will lead to low in precision of billet characters location, a special algorithm complexed multilevel processing with the location of first rough and then accurate is presented in this paper. Noises are filtered through area filter, distance filter and projection filter gradually. To the special case that interference can´t filtered completely, locating the characters roughly and then multilevel processing are brought up. At last, billet characters will be located by means of projection function. Experimental results show that the proposed method can locate characters accurately from the complex background, and ensure the high recognition rate.