Barcode decoding method
a barcode and decoding technology, applied in the field of barcode decoding methods, can solve problems such as decoding problems, and achieve the effect of increasing the success rate of decoding
Active Publication Date: 2017-09-28
QISDA CORP
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Benefits of technology
The present invention provides a method for improving the success rate of barcode decoding, especially when the distance between the barcode reader and the target barcode is relatively long. This is achieved by dividing the gray level distribution of the target scan line into bar and space areas, and interpolating missing or vague bars or spaces based on the peak and valley points within the target image of the barcode. This increases the decoding success rate and ensures accurate barcode recognition.
Problems solved by technology
This causes decoding problems especially when the barcode reader is not incorporated with a zoom lens.
Method used
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[0021]Please refer to FIG. 1 through FIG. 5. FIG. 1 is a flowchart showing the method of establishing a look-up table including correspondence between the characteristic parameters of a barcode image and the relative distances according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a barcode reader 10 and a template barcode 12. FIG. 3 is a schematic diagram of a gray level distribution of a template scanning line of a template image of the template barcode 12 when the predetermined distance between the barcode reader 10 and the template barcode 12 is the relatively intermediate distance. FIG. 4 is a schematic diagram of a gray level distribution of a template scanning line of a template image of the template barcode 12 when the predetermined distance between the barcode reader 10 and the template barcode 12 is the relatively long distance. FIG. 5 is a schematic diagram of a gray level distribution of a template scanning line of a template image of the t...
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A barcode decoding method includes steps of analyzing a relative relationship between at least two characteristic points of a gray level distribution of a target scanning line of a target barcode to obtain at least one reference characteristic parameter; when determining a current distance between a barcode reader and the target barcode being a relatively long distance, dividing the gray level distribution into at least one bar area and at least one space area; setting a gray level region and locating at least one peak point and / or at least one valley point located within the gray level region from the gray level distribution; when the peak point is located within the bar area, interpolating a space corresponding to the peak point into the bar area; and when the valley point is located within the space area, interpolating a bar corresponding to the valley point into the space area.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a barcode decoding method, and more particularly, to a barcode decoding method for effectively increasing decoding success rate.[0003]2. Description of the Prior Art[0004]A barcode is a figurate identification code composed of a plurality of parallel black stripes with different widths and arranged according to a specific encoding rule to present certain messages. Since a barcode can be used to identify a product's manufacturing country, manufacturer's name, product's name, manufacturing date, book category number and sender's and recipient's mailing addresses, etc., it is therefore widely applied in many fields.[0005]When the barcode is read by the barcode reader, the minimum width of the stripe and the space in the barcode that can be decoded by the barcode reader is affected by the depth of field, the pixel resolution of the image sensor, the characteristics of the optical lens and so...
Claims
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IPC IPC(8): G06K7/14G06K19/06G06K7/10
CPCG06K7/1447G06K7/1413G06K7/10792G06K19/0614G06K7/10722G06K19/06028G06K7/1439
Inventor LIN, CHI-CHENGHUANG, MIN-HSIUNGWU, CHUANG-WEI
Owner QISDA CORP