| 摘要 |
<p>The invention relates to devices for reading and identifying barcodes, which are used in commercial equipment. The inventive method consists in processing an image, in determining the absolute value of a gradient components, in carrying out low-frequency filtration and decimation of images of absolute values of the gradient components, in element-by-element determining the absolute difference between two pairs of perpendicular directions of the components, in comparing brightness of pixels of the two obtained images and in localising a bar code. A scanner comprises an objective lens, a photosensitive array, computing and interface units, an objective lens actuator provided with a membrane-type spring, a permanent magnet and two solenoids. The inventive payment-processing unit comprises a table for placing goods and a scanner positioned thereabove. Said invention makes it possible to accelerate customer service rate, the reliability of a barcode scanning, to improve operational and service conditions, to increase resistance to jamming and image defects and to extend a scanning depth.</p> |
