A Machine Vision Based Medicine Package Printing Three Date Marks Detection Scheme

To solve the problem of misprinting or obscure of Three Date Marks (TDMS) including production date, batch number and the validity on the medicine packaging, a delay-based misplaced difference scheme for medical information detection is presented. Firstly, two medical images are Successively captured by a machine vision detection system, and a character image is obtained through misplaced subtraction operation; Then, a convolution kernel is designed according to the size of characters to widen the strokes, and a specific operation with corrosion and dilation is further utilized to remove speckle noise to enhance the quality of object characters. Finally, a modified weighted median filter is employed to further improve the recognition accuracy. Experimental results show that the detection precision and efficiency satisfy the requirements of medical packaging triple tags detection well.