Registers – Coded record sensors – Particular sensor structure
Patent
1997-11-12
1999-07-27
Hajec, Donald
Registers
Coded record sensors
Particular sensor structure
23546225, G06K 710
Patent
active
059294230
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
Use is being made on increasingly large scale and in many different fields of bar codes, for instance in supermarkets but also for stock control and the like. Using bar codes stock control is improved, transit speed is increased and more accurate specifications of supplied goods can be given to the buyer, such as the consumer.
It is still a regular occurrence however that a bar code is not decoded at the first reading by a scanning device. This can be due for instance to a differing width of a bar or space, as well as to the inhomogeneity of the paper on which the bar pattern is printed, noise occurring for instance as a result of ambient influences or caused by analog electronics, thermal noise and/or variations in the scanning equipment used.
Known scanning devices, for instance making use of laser beams, of CCD (Charge Coupled Devices) image recorders and/or making use of RF (Radio Frequency) induction and methods for decoding bar codes are widely described in the patent literature, for instance in the non pre-published European patent applications 952015097 and 952021939 of applicant.
Also known from EP 0439682 is a method and device according to the precharacterising part of claims 1 and 8 respectively.
SUMMARY OF THE INVENTION
The present invention provides a method for decoding one or more bar codes comprising a plurality of marks, such as information marks, separation marks and the like, wherein each of the marks comprises one or more spaces and one or more bars wherein each bar or space is formed by at least one module, and wherein the method comprises the steps of: pick-up for picking up reflected laser beams; each of which is formed by the combined width of a bar and an adjacent space; covered by each time pair; membership degree with which each mark value has a length of an integer number of modules; information values represented by the barcode and their membership degrees, using a predetermined relationship between mark values and information values; and thereof using the determined information values and their membership degrees.
It has been demonstrated in practice with the method according to the present invention that difficult bar patterns are also recognized more quickly. In addition, the present invention provides a device for scanning and decoding bar patterns.
The present invention further provides an apparatus for decoding one or more barcodes comprising a plurality of marks, such as information marks, separation marks and the like, wherein each of the marks comprises one or more spaces and one or more bars wherein each bar or space is formed by at least one module, and wherein the apparatus comprises: instance a pick-up for picking up reflected laser beams; time pairs, each of which is formed by the combined width of a bar and an adjacent space; of modules covered by each time pair; the membership degree with which each mark value has a length of an integer number of modules; possible information values represented by the barcode and their membership degrees, using a predetermined relationship between mark values and information values; and part thereof using the determined information values and their membership degrees. of the spaces and bars found inside the mark or in the immediate vicinity thereof; values with a degree; and thereof using the determined information values.
It has been demonstrated in practice with the method according to the present invention that difficult bar patterns are also recognized more quickly. In addition, the present invention provides a device for scanning and decoding bar patterns.
The present invention further provides a device for decoding bar codes.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages, features and details of the present invention will be detected on the basis of the following description wherein reference is made to the annexed drawings, in which:
FIG. 1 shows an EAN-13 bar pattern;
FIG. 2 shows a table of the information marks used in an EAN-13 symbol;
FIG. 3 shows an overview of the auxiliary marks used in a
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Boersma Gerrit
Maat Dennis Johannes
Fureman Jared J.
Hajec Donald
Scantech B.V.
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