KR940006119B1 - Deciphering method of barcode system - Google Patents

Abstract

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Description

How to read barcode systems

1 is a schematic diagram of a general K & A standard code.

2 is a block diagram of a barcode system of the prior art and the present invention.

3 is a signal flow diagram showing a reading method of a conventional bar code system.

4 is a signal flow diagram showing a reading method of the barcode system of the present invention.

* Explanation of symbols for main parts of the drawings

1: Barcode label 2: Light source

3: lens 4: image sensor

5: Image sensor driver 6: Analog signal part

7: Digitizer 8: Memory

9: central processing unit 10: output unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to reading a barcode system, and more particularly, to a method of reading a barcode system that enables a user to find and read valid data by themselves even when a UPC (Universal Product Code) series barcode lacks a margin.

In general, there are several kinds of barcodes, among which there are UCP codes, and there are UCP codes, E.A.-13, E.A, and N-8. Among them, A & N-13 code matches the K & N standard code set by the Korean Industrial Standard and A & -8 matches the K & N short form.

1 is a diagram showing the K.A. code used as a common product code of the Korean Industrial Standard. The bar code or the smallest bar code among the bar code data is called one module. .

The left margin (11) and the right margin (12) are 11 or 7 modules or more, respectively, and the left and right guide bars (13) and (14) on both sides are the bars of one module, the space of one module, and one. It should be a module bar (1, 0, 1) (hereinafter, 1 module bar = 1, 1 module space = 0), and the center 16 is data (01010), one character is space 2 There are two bars and one data size, ranging from one module size to four modules.

Then, the left data character 17 is displayed as six, and the prefix character 19 which is the first from the combination of these six characters 17 is generated, and the right data character 18 has five characters and one one. There is a check character 20, which must match the combination of the remaining characters.

Here, the difference between the series codes is that there is no prefix character 17 in the UPC standard type, and there are only four characters in each of the A & N codes.

The present invention defines that the left margin should be 11 modules or more, and the right margin should be 7 modules or more in the Korean Industrial Standard, as described above, in order to read bar code labels with both margins smaller than the standard. Depending on the design, area, or printing condition, the margins may be printed below the standard.

There is also a bar code printed with a margin smaller than the valid data of up to 4 modules.

Therefore, the present invention enables reading regardless of the size of the margin as long as the left and right margins exist as spaces.

In the conventional bar code system, as shown in FIG. 2, a bar code label 1, a scanning unit (a) for scanning a barcode signal, and a decoder unit (b) for reading out the signal received from the scanning unit (a) The scanning unit (a) comprises a light source (2) for scanning light onto the barcode label (1), a lens (3) for focusing reflected light, and a light focused by the lens (3). An image sensor 4 to be mounted, an image sensor driver 5 for driving the image sensor 4, an analog signal unit 6 for receiving an analog signal from the image sensor 4, and the analog signal unit It consists of the digitizer part 7 which digitizes the analog signal of (6).

The decoder b stores a central processing unit 9 for discriminating and controlling data input from the digitizer unit 7, a decoding program and data digitized by the central processing unit 9. Memory section 8 and an output section 10 for final output.

The conventional technical operation configured as described above will be described with reference to the signal flow diagram of FIG. 3.

First, when light is emitted from the light source 2 and shines on the scan line of the barcode label 1, the light is reflected as scattered light on the barcode label 1 surface.

The reflected light is focused on the lens 3 and then sent to the image sensor 4. At this time, in order to drive the image sensor 4, an appropriate clock and power are respectively supplied from the image sensor driver 5 to the image sensor 4. Authorize.

Then, the signal arriving at the image sensor 4 is amplified by an appropriate signal in the analog signal unit 6, and the amplified signal is digitized to 0 and 1 in the digitizer unit 7 to be supplied to the decoder unit b. .

Accordingly, the central processing unit 9 stores this signal in the memory unit 8 and starts decoding from the digitized data. At this time, the left and right margins are read as a reference to the left and right margins. Uncoded barcodes will eventually become unreadable.

That is, as shown in FIG. 3, it is determined whether to start valid data by looking at the left margin. At this time, since other signals around may come in at the time of scanning, if the margin is not satisfied, the next space data is brought. Because the margin is always space.

If the margin is not satisfied, the process is repeated. If the margin is satisfied, the reading starts from the next data. If the margin is not satisfied even if it is the real margin, the decoder ignores the margin and continues to find the left margin. You will not be able to read.

In addition, after reading valid data, it is determined whether the next data is the right margin, and when the margin is satisfied, the entire read data is synthesized. If the margin condition is not satisfied, a read error occurs even in this case.

In addition, when reading is completed in the read synthesis step, data is output and decoding is terminated. If it is determined that an error is found in the read synthesis step, it is checked whether there is still data to be read continuously.

At this time, if there is enough data to be valid data, it returns to the first loop and reads into the remaining data. If there is no remaining data or there is not enough data, an error is output and terminated.

However, this method of reading a barcode system has a problem that the barcode cannot be read even if the data condition except for the margin is good, if the condition of the margin is not satisfied in steps A and B of FIG. 3.

In order to solve the problem that the bar code printing cannot be processed by the bar code system in the conventional bar code printing as described above, the space of the space is irrelevant to the size of the margin of the UPI series code which is lacking in the space among these logistics. The present invention is a method of reading a bar code system that can read a bar code using the conditions that the UPC series code only needs to exist, and it will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram of a barcode system constructed in the same manner as in the related art, and as shown therein, a light source 2 for scanning light onto a barcode label 1, a lens 3 for focusing reflected light, and a focused light An image sensor 4, an image sensor driver 5 for driving the image sensor 4, an analog signal unit 6 for receiving an analog signal from the image sensor 4, and a digitizer unit for digitizing the analog signal ( 7) a scanning unit (a), a memory unit (8) for storing a decoded program and digitized data, a central processing unit (9) for decoding, and an output unit (10) for final output. (b) is configured.

4 is a signal flow diagram showing a method of reading a bar code system applied to a bar code system configured as shown in FIG. 2, and the reading method of the present invention will be described in detail with reference to this signal flow diagram.

In the present invention, all of the PC series code can be read, but each code is similar because only some assumptions and time points of confirmation are similar.

First, the central processing unit 9 receives the digital data from the digitizer unit 7 of FIG. 2 and stores all the data in the memory unit 8.

Thereafter, the central processing unit 9 reads as in the procedure of FIG. 4, but all the barcodes which have no abnormality are finished reading in the output stage H of FIG.

However, the bar code lacking the left and right margins does not satisfy the left margin first, so the left margin condition is checked by reading the next space data. During this operation, the valid data of the bar code with insufficient left margin is overrun. Then, the data such as the left margin is met by the background picture or text, and the data is set as the start address and read.

Since the end of the scanner is terminated with the same data as the space data, the right margin is satisfied. Therefore, the result is satisfied with the right margin. To get started.

As shown in FIG. 4, the total number of input data is read in the step (E) of reading out the entire data and finally performing error processing.

If the number of data is more than 59 (because the number of input data of UCP standard code is left guide bar: 3, left 6 char: 4 × 6 = 24, center bar: 5, right 6 char: 4 × 6 = 24, right guide bar: 3, consisting of 59 total data), this input bar code data may be a standard PP code, so it is assumed that the standard PP code, and the data defined by the standard PP Start checking to see if it fits.

If it is not more than 59, it is necessary to continue checking with another code of the UPI series which has the next smallest number of data, but it just exits to step (F).

If the number is 59 or more, the address is set as the first space data among the input data and the check is started. First, it is determined whether the left guide data is "101". If it is not " 101 ", the next space data address is set as the first one, and there are still more than 59 remaining data. If the number is insufficient, the process goes to step (F).

On the other hand, if there is more than the required number of data remaining, it continues to check whether the left guide data is "101", since the beginning of the valid data assumes that the space data is a margin rather than finding a margin beyond a certain size. Find valid data regardless of the size of the margin.

Therefore, if the left guide data satisfies "101", check whether the center data is "1010". If the condition is not satisfied here, go to step (G). If the conditions are satisfied, check whether the right guide data is "101". do.

And, again, the important thing here is to find the right margin, that is, to find the end of valid data, not the size of the margin, but to find the last valid data by the number of data assumed in advance.

If all three of the above steps, that is, all 11 data at the predetermined position, satisfy the condition, the data is read with valid data.

During the reading, the error is checked in several stages (the normal reading loop is checked in several stages), and the final check character is confirmed with the last read all characters and finally output.

This is because other barcodes may not have a check character, but must have a UPC series code, and the above checks are below the normal UPC code misreading probability (1 / 145.000).

As described in detail above, conventionally, barcode input data is read on the basis of a margin and an error process is performed when it cannot be read. Thus, a barcode-printed product with insufficient margin is eventually processed even if the valid data state is good. In this case, any bar code system other than keystrokes becomes ineffective.

Therefore, the present invention enables the reading of the UPC series code as long as the margin exists as a space regardless of the size of the margin, thereby completely eliminating the read error due to the lack of margin.

In addition, the present invention can create a wider design in the appearance of the product and there is an effect that can be read even if the same dozens of data are drawn on both ends of the bar code without precise calculation and precise printing through a computer.

Claims (1)

After reading all the data, read the number of input data in the error processing step. If the number of data is 59 or more, set the address as the first space data, and determine whether the left guide data is "101", or set the next space data address. If the number of remaining data is 59 or less, it ends. If the left guide data is "101", it is determined whether the center data and the right guide data are "1010" and "101", respectively. A method of reading a bar code system, characterized in that the output is confirmed by checking with a check character.