Method of detecting a bar code.

THE INVENTION REFERS TO A METHOD AND APPARATUS FOR DETECTING A BAR CODE OF A BAR CODE SIGNAL THAT ESSENTIALLY FORM A CROSS SECTION OF A BAR CODE MODEL THAT, BY IRRADIATION, ISSUING LIGHTING FROM A CARRIER FUND FLUORESCENT ACTION. THE DETECTION IS CARRIED OUT BY VERIFYING THE BAR CODE SIGNAL (F) (T) WITHIN EACH AREA (ZG1, TIS) INSIDE WHICH A BAR CAN BE EXPECTED, WITH A BAR CRITERIA (THR, MTHR) OBTAINED BY THE PREDICTION, WITH THE HELP OF A PREDICTION TABLE (TABLE 1), OF A LOCAL FUND SIGNAL VALUE (AGR) LOCALLY DERIVED FROM THE BARCODE SIGNAL SIGNAL (F) (T). THIS METHOD TAKES ADVANTAGE OF THE FACT THAT, IN THE FIRST PLACE, BETWEEN THE BARS PRESENT INVARIABLY THE CARRIER FUND IS, CREATING A RELIABLE PERIODIC FUND APPROXIMATION OF THE VALUE OF THE POSSIBLE BAR CODE SIGNAL AND, SECONDLY, THERE IS CERTAIN CORRELATION BETWEEN A FUND AND THE CONTRIBUTION OF THE SIGNAL ADDED IN RESPONSE TO THE LIGHTING OF THE BARS OF THE FUND UNDER IRRADIATION. THE PREDICTION TABLE IS COMPILED IN A PREVIOUS TIME FROM A SERIES OF MAXIMUM ION VALUES OF THE SAME AND THE MINIMUM RESPONSE OF CORRESPONDING BARS. THE PROPERTIES OF THE INK USED FOR THE BARS AND THE MEANS OF COLLECTION (5, 61) TO OBTAIN THE BAR CODE SIGNAL ARE EXPRESSED IN THESE VALUES. THE ADVANTAGE IS THAT THE INFLUENCE OF THE FUND, MAINLY DUE TO THE LOCAL OR GLOBAL LIGHTING OF THE OWN FUND, DOES NOT ADVERSELY AFFECT THE RELIABILITY OF A "BAR / NO BAR" DECISION.