Code scanning method of double-camera code scanning engine

Abstract

According to the code scanning method of the double-camera code scanning engine provided by the invention, the code scanning engine can give consideration to both long-distance code scanning and short-distance code scanning by setting the first camera unit and the second camera unit with different focal lengths, and meanwhile, the code scanning engine also has incomparable advantages in the aspects of cost, size and durability compared with a zoom engine; by arranging the control signal switching unit and the data signal switching unit, the system can be compatible with an existing code scanning engine, other signals do not need to be additionally added, and the compatibility and the cost are optimal; according to the code scanning method, the image is acquired by adopting the single camera unit, and the other camera unit is switched to be used until the decoding is unsuccessful, so that the time loss caused by frequent switching is reduced, and the decoding effect and the decoding efficiency are ensured.

Description

Technical field [0001] The present invention relates to the field of bar code scanning technology, in particular to a dual scanning code engine scanning method. Background [0002] At present, bar code scanning devices are widely used in supermarkets, logistics, industrial identification and other fields. The implementation of bar code scanning technology is generally based on the way of digital image acquisition and processing, through the digital camera original acquisition of the identified bar code image, after image processing and decoding, recognized as a digital signal that can be directly accepted by the computer. [0003] In some industry applications, when users use devices such as code scanners or PDAs to enter barcode data, some stations need to enter long-distance barcodes, some stations need to enter close-range barcodes, and even some stations need to scan both remote and proximal barcodes. Most of the existing low-end scanning engines use fixed-focus optical lense...

AI Technical Summary

Problems solved by technology

Most of the existing mid-to-low-end scanning engines use fixed-focus optical lenses, and the optical depth of field is relatively short. They are generally configured with different product SKUs according to the usage scenarios, such as HD (high definition) for short-range, and ER for long-range. / XR (extended range) and SR (standard range) that specialize in medium and short distances. Since different SKUs of mid- and low-end fixed-focus lenses have different optical clarity ranges, it is impossible to take into account both long-distance and medium-to-near distance scanning; while high-end scanning The code engine will use a zoom lens to dynamically adjust the focal length to see the barcode at the far or near end. However, due to the size, price, and zoom time of the zoom lens, the durability of the lens is much worse than that of the fixed-focus lens.

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