A rapid defect detecting algorithm for printed matter on the assembly line

To better adapt to defect detection requirements of the industrial printed matter on the assembly line, this paper proposed a rapid defect detection algorithm. First we improved the Surf algorithm and made better the detection of the feature point performance and speed effectively; Second, a new FIFO feature point matching algorithm was introduced that could save feature matching time about 50%; Finally we introduced a two-way image difference algorithm to avoid error detecting for contour artifact. Experimental results showed that the proposed algorithm could meet real-time requirements on assembly line.