TW201601068A - Image type high-speed barcode scanning method - Google Patents

Abstract

An image type high-speed barcode scanning method includes the steps that an image of a barcode of a label is read by an image sensor, the image is stored in an image storage and memory device, and then the image of the barcode of the label is sampled in multiple directions and full-width image decoding is carried out. During the multiple-direction sampling, the barcode is scanned successively by multiple X-axis directions, Y-axis directions, first inclined axial directions and second inclined axial directions, so a sequence sampling signal of the multiple scanning lines is obtained. Decoding is carried out by a one-dimension image decoding engine, and one-dimension barcode information is obtained. If the barcode of the label is a two-dimension barcode, then decoding is carried out by a two-dimension image decoding engine and two-dimension barcode information is obtained.

Description

Image type high speed barcode scanning method

The invention relates to a barcode scanning method, in particular to an image high speed barcode scanning method.

Bar codes are widely used in today's commercial activities, especially in the high-tech industry, storage and transportation, wholesale and retail industries, etc., which require rapid labeling and transmission of information.

Since the bar code can indicate the country of manufacture, manufacturer, product name, date of manufacture, book classification number, start and end of the letter, category, date, etc., it is used in many fields such as commodity circulation, book management, postal management, banking system, etc. Has been widely used.

The type of bar code currently used is roughly divided into a one-dimensional bar code and a two-dimensional bar code. The structure of the one-dimensional bar code is mainly a parallel line pattern in which a plurality of black bars and spaces of different widths are arranged according to a certain coding rule, and a graphic identification element for expressing a group of messages.

The scanning of the barcode requires a scanner. The scanner uses its own light source to illuminate the barcode, and then uses the photoelectric converter to receive the reflected light, and converts the light and dark of the reflected light into a digital signal.

To convert a bar code compiled according to certain rules into a meaningful message, you need to go through two processes of scanning and decoding. The color of an object is determined by the type of light it reflects. White objects can reflect visible light of various wavelengths, while black objects absorb visible light of various wavelengths. Therefore, when the light emitted by the bar code scanner source is reflected on the bar code, the reflected light is irradiated. To the photoelectric converter inside the barcode scanner, the photoelectric converter converts into a corresponding electrical signal according to different reflected light signals of different strengths and weaknesses.

The width of the white strip and the black strip are different, and the corresponding duration of the electrical signal is also different. The decoder then discriminates the number of bars and spaces by measuring the number of pulsed digital signals 0,1. The width of the strip and the space are determined by measuring the duration of the 0, 1 signal. The information obtained at this time is still chaotic. To know the message contained in the barcode, the bar symbol should be replaced with the corresponding digit and character message according to the corresponding coding rule (for example: EAN-8 code). Finally, the data processing and management by the computer system, the detailed information of the item is identified.

The two-dimensional bar code refers to a bar code that expands another dimension on the basis of one-dimensional bar code, and uses a black and white rectangular pattern to represent binary data, and is scanned by the device to obtain information contained therein.

However, commercially available bar codes in various fields may use one-dimensional bar codes, and it is also possible to use two-dimensional bar codes. Therefore, the operator must configure the reader of the one-dimensional barcode and the two-dimensional barcode at the same time in order to smoothly read the barcode information.

In order to solve this problem, the industry has designed an integrated device that has both a one-dimensional barcode and a two-dimensional barcode reading function. Although this design solves the problem of different readers purchasing different readers, in actual operation, if the standard barcode is a one-dimensional barcode, most of the system resources are due to the poor performance of the traditional one-dimensional barcode scanning engine. (for example, about 65%) will consume the decoding operation of the one-dimensional barcode, and only a small part of the system resources (for example, about 35%) consume the decoding operation of the two-dimensional barcode. In this way, the overall system performance cannot be improved.

Furthermore, in the prior art, when scanning and sampling a one-dimensional barcode, the scan line needs to be scanned from left to right, and the scan line must be perpendicular to the one-dimensional barcode to accurately read the one-dimensional barcode. Barcode information. This can cause operational limitations for the operator, and there are often problems with scan failure and defect.

Therefore, in order to solve the above problems, an object of the present invention is to provide an image-based high-speed bar code scanning method, so as to improve the scanning operation efficiency of the bar code, so as to improve the system resources encountered in the conventional method and consume a large amount of one-dimensional bar code. The problem of decoding.

The technical means for achieving the above object is to read a bar code image of a standard bar code through an image sensor, store it in an image access memory device, and then perform multi-directionality on the bar code image of the target bar code. Sampling and full-frame image decoding. In the multi-directional sampling, scanning lines of a plurality of X-axis, Y-axis, first oblique axial direction and second oblique axial direction are scanned one by one bar code to obtain a sequence of the plurality of scanning lines. The sampled signal is decoded by a one-dimensional image decoding engine to obtain one-dimensional bar code information. If the target barcode is a two-dimensional barcode, the two-dimensional image decoding engine decodes the two-dimensional barcode information.

The bar code information output interface can be one of a USB, a serial output interface, and a parallel output interface.

Wherein, the multi-directional sampling comprises the following steps: (a) scanning a plurality of the one-dimensional barcodes by a plurality of X-axis scan lines to obtain a sequence of X-axis sampling signals of the plurality of X-axis scan lines; b) scanning a plurality of Y-axis scan lines by a plurality of Y-axis scan lines to obtain a sequence of Y-axis sampling signals of the plurality of X-axis scan lines; (c) using a plurality of first oblique scan lines Scanning a pair of the one-dimensional barcodes one by one to obtain a sequence of first oblique sampling signals of the plurality of first oblique scanning lines; (d) scanning the one-dimensional barcodes by a plurality of second oblique scanning lines And obtaining a sequence of second oblique sampling signals of the plurality of second oblique scanning lines; (e) obtaining the obtained sequence of X axial sampling signals, a sequence of Y axial sampling signals, and a sequence of first oblique The sequence of sampled signals is composed of a sampled signal and a sequence of second obliquely sampled signals.

In terms of effect, since the decoding of the one-dimensional barcode is multi-directional sampling and then decoded by the one-dimensional image decoding engine, the decoding performance has a fast performance, so that the decoding time of the one-dimensional image is greatly reduced, and the system data can be occupied without occupying most of the system data. In the situation, the performance of the entire system is improved. If the target barcode is a two-dimensional barcode, the 2D image decoding engine can Decoding the barcode completely, and speeding up the decoding of the 2D barcode.

Furthermore, since the present invention samples the one-dimensional barcode image in the multi-directional sampling mode when sampling the one-dimensional barcode, the multi-directional sampling in the present invention can be performed regardless of the barcode in any of the orientation directions. The accurate reading of the mode does not limit the scanning line to be perpendicular to the bar code in the prior art, which can improve the operation performance of the operator and effectively improve the scanning failure and defect.

The specific embodiments of the present invention will be further described by the following examples and the accompanying drawings.

1‧‧‧labeled barcode

2‧‧‧Light source device

21‧‧‧Light source

3‧‧‧Processing unit

4‧‧‧Image sensor

41‧‧‧Image Processing Interface

5‧‧‧Image access memory device

6‧‧‧One-dimensional image decoding engine

61‧‧‧Multi-directional sampling program

62‧‧‧1D Barcode Information Conversion Form

7‧‧‧Two-dimensional image decoding engine

71‧‧‧2D barcode information conversion table

8‧‧‧Barcode information output interface

9‧‧‧ display

C1‧‧‧1D barcode

C2‧‧‧2D barcode

X1, X2, X3...Xn‧‧‧X axial scan lines

Y1, Y2, Y3...Yn‧‧‧Y axial scan line

L1, L2, L3...Ln‧‧‧ first oblique scan line

K1, K2, K3...Kn‧‧‧second oblique scanning line

S1’‧‧‧ sequence sampling signal

S1‧‧‧1D Barcode Information

S2‧‧‧2D barcode information

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram showing the function of a preferred embodiment of the present invention.

Figure 2 shows a flow chart of the invention.

Figure 3 is a flow chart showing the multi-directional sampling program of the present invention for multi-directional sampling.

4A-4D are schematic diagrams showing the scanning of the multi-directional sampling program of the present invention when multi-directional sampling of a one-dimensional barcode.

Referring to Figure 1, there is shown a functional block diagram of a preferred embodiment of the present invention. The image type high speed barcode scanning device of the present invention is designed to scan a standard barcode 1 to obtain barcode information of the target barcode. The target barcode 1 may be a one-dimensional barcode C1 or a two-dimensional barcode C2.

A light source device 2 generates a light source 21 that is projected onto the target barcode 1 to provide a light source of appropriate illuminance to the target barcode 1. The light source device 2 can be controlled by the processing unit 3.

An image sensor 4 is coupled to the processing unit 3 via an image processing interface 41. The image sensor 4 is aligned with the barcode 1 to read the barcode image 11 of the barcode 1 , and then sent to the processing unit 3 via the image processing interface 41 .

An image access memory device 5 is connected to the processing unit 3 for storing the barcode image 11 of the target barcode 1 captured by the image sensor 4.

The bar code image 11 of the target bar code 1 stored in the image access memory device 5 is multi-directionally sampled by the multi-directional sampling program 61, and a sequence of sample signals S1' is generated.

The sequence sampling signal S1' is further decoded by the one-dimensional image decoding engine 61, and one-dimensional bar code information S1 is obtained according to the one-dimensional bar code information conversion table 62.

A conversion table useful for converting the one-dimensional barcode into one-dimensional barcode information according to a predetermined encoding rule is previously stored in the one-dimensional barcode information conversion table 62.

At the same time, the barcode image 11 of the target barcode 1 stored in the image access memory device 5 is sent to the two-dimensional image decoding engine 7 for decoding. If the target barcode 1 is the two-dimensional barcode C2, the decoding can be successfully performed, and the two-dimensional barcode information S2 can be obtained according to the two-dimensional barcode information conversion table 71.

Since the standard barcode 1 is a one-dimensional barcode C1 or a two-dimensional barcode C2, only the one-dimensional image decoding engine 61 can obtain one-dimensional barcode information S1 or the two-dimensional image decoding engine 7 obtains two-dimensional barcode information S2 and outputs the barcode information output. The interface 8, which is then displayed by the display 9.

Figure 2 shows a flow chart of the invention. The flow of the present invention will now be described with reference to FIG. Firstly, a light source 2 is generated to project the barcode 1 (step 101), and then the image sensor 4 is aligned with the barcode 1 to read the barcode image 11 of the barcode 1 and sent to the image processing interface 41. Processing unit 3 (step 102).

The barcode image 11 of the target barcode 1 captured by the image sensor 4 is first stored in an image access memory device 5 (step 103).

The bar code image 11 of the target bar code 1 stored in the image access memory device 5 is multi-directionally sampled by the multi-directional sampling program 61 (step 104), and a sequence of sample signals S1' is generated.

Next, the sequence sample signal S1' is decoded by the one-dimensional video decoding engine 62 to obtain one-dimensional bar code information S1 (step 105).

The one-dimensional bar code information S1 obtained in step 105 or the two-dimensional bar code information S2 obtained in step 106 is displayed by the display 9 after being output to the bar code information output interface 8 (step 107).

3 is a flow chart showing the multi-directional sampling program 61 of the present invention when multi-directional sampling is performed, and FIG. 4 is a scanning diagram showing the multi-directional sampling program 61 for multi-directional sampling of the one-dimensional barcode C1. The following steps: In step 201, a plurality of X-axis scan lines X1, X2, X3, ... Xn are scanned one by one-dimensional bar code C1 to obtain the plurality of X-axis scan lines X1, X2, X3... A sequence of Xn X-axis samples the signal S1'. Its further implementation procedures are as follows: Referring to FIG. 4A, the one-dimensional bar code C1 is first scanned by an X-axis scan line X1, and the X-axis scan line X1 is sampled to obtain a plurality of sample signals of the X-axis scan line X1. After the plurality of sampling signals of the X-axis scan line X1 are obtained, the second X-axis scan line X2 is then scanned to obtain a sequence of X-axis sampling signals of the X-axis scan line X2.

After the above Y-axis scan sampling is completed, Y-axis scan sampling is then performed. In step 202, referring to FIG. 4B, the one-dimensional barcode C1 is first scanned with a Y-axis scan line Y1, and the Y-axis scan line Y1 is sampled to obtain a plurality of samples of the Y-axis scan line Y1. signal. After the plurality of sampling signals of the Y-axis scanning line Y1 are obtained, the second Y-axis scanning line Y2 is then scanned to obtain a sequence of Y-axis sampling signals of the Y-axis scanning line Y2. Thus, a sequence of Y-axis sampling signals of a plurality of Y-axis scan lines Y1, Y2, Y3, ..., Yn can be obtained.

After the above-described scan sampling is completed, the first oblique scan sampling is then performed. In step 203, referring to FIG. 4C, the one-dimensional barcode C1 is first scanned by a first oblique scan line L1, and the first oblique scan line L1 is sampled to obtain the first A plurality of sampling signals of the scanning line L1 are obliquely scanned. After the plurality of sampling signals of the first oblique scanning line L1 are obtained, the second first oblique scanning line L2 is scanned to obtain a sequence of the first oblique sampling signals of the first oblique scanning line L2. . Thus, a sequence of first oblique sampling signals of the plurality of first oblique scanning lines L1, L2, L3, ... Ln can be obtained.

After the above-described scan sampling is completed, a second oblique scan sampling is then performed. In step 204, referring to FIG. 4C, the one-dimensional barcode C1 is first scanned by a second oblique scan line K1, and the second oblique scan line K1 is sampled to obtain the second oblique scan line K1. A plurality of sampling signals. After the plurality of sampling signals of the second oblique scanning line K1 are obtained, the second second oblique scanning line K2 is scanned to obtain a sequence of the second oblique sampling signals of the second oblique scanning line K2. . Thus, a sequence of second oblique sampling signals of the plurality of first oblique scanning lines K1, K2, K3, ... Kn can be obtained.

Finally, in step 205, a sequence of X-axis sampling signals, a sequence of Y-axis sampling signals, a sequence of first oblique sampling signals, and a sequence of second oblique sampling signals obtained in the foregoing steps are formed. The sequence samples the signal S1'.

The above embodiments are merely illustrative of the design of the invention and are not intended to limit the invention. Any modifications and variations of the above-described embodiments can be made by those skilled in the art, and such changes are still within the spirit of the invention and the scope of the invention as defined below. Therefore, the scope of protection of the present invention should be as set forth in the appended claims.

Claims (5)

An image high-speed bar code scanning method for scanning a bar code to obtain bar code information of the bar code, the method comprising the following steps: (a) generating a light source to project a bar code of the target, the bar code is a one-dimensional bar code Or a two-dimensional barcode; (b) aligning the target barcode with an image sensor to read the barcode image of the target barcode, and sending it to a processing unit via an image processing interface; (c) sensing the image The barcode image of the target barcode captured by the device is stored in an image access memory device; (d) the barcode image of the target barcode stored in the image access memory device is multi-directional by a multi-directional sampling program Sampling, if the barcode image is the one-dimensional barcode, a sequence of sampling signals is obtained, and the sequence sampling signal is decoded by a one-dimensional image decoding engine to obtain one-dimensional barcode information; (e) the barcode is simultaneously The image is decoded by the two-dimensional image decoding engine for full-frame image decoding. If the barcode image is the two-dimensional barcode, a two-dimensional full-image barcode information is decoded; (f) the one-dimensional barcode is encoded. One full-size image of the two-dimensional bar code information is output to a display via a bar code information output interface. The image type high speed barcode scanning method according to claim 1, wherein the barcode information output interface is one of a USB, a serial output interface, and a parallel output interface. The image type high speed barcode scanning method according to claim 1, wherein in the step (d), the multi-directional sampling comprises the following steps: (d1) performing a plurality of X-axis scan lines one by one for the one-dimensional barcode Scanning to obtain a sequence of X-axis sampling signals of the plurality of X-axis scan lines; (d2) scanning a plurality of Y-axis scan lines by a pair of the one-dimensional barcodes to obtain the plurality of X-axis scans a sequence of Y-axis sampling signals of the line; (d3) scanning a pair of the one-dimensional barcodes by a plurality of first oblique scan lines to obtain a sequence of first oblique sampling signals of the plurality of first oblique scan lines; (d4) The oblique scan line scans one pair of the one-dimensional barcodes to obtain a sequence of second oblique sampling signals of the plurality of second oblique scan lines; (d5) the obtained sequence of X-axis sampling signals, The sequence Y axial sampling signal, a sequence of first oblique sampling signals, and a sequence of second oblique sampling signals form the sequence sampling signal. An image high-speed bar code scanning method for scanning a bar code to obtain bar code information of the bar code, the method comprising the following steps: (a) generating a light source to project a bar code of the target, the bar code is a one-dimensional bar code (b) aligning the target barcode with an image sensor to read the barcode image of the target barcode, and sending it to a processing unit via an image processing interface; (c) capturing the image sensor The barcode image of the target barcode is stored in an image access memory device; (d) the barcode image of the target barcode stored in the image access memory device is multiplied by a plurality of X-axis scan lines The barcode is scanned to obtain a sequence of X-axis sampling signals of the plurality of X-axis scan lines; (e) the barcode image of the target barcode stored in the image access memory device is plural Y The axial scan line scans a pair of the one-dimensional barcodes to obtain a sequence of Y-axis sampling signals of the plurality of X-axis scan lines; (f) the barcodes of the target stored in the image access memory device The barcode a sequence of first oblique sampling signals of the plurality of first oblique scanning lines; (g) scanning the barcode image of the target barcode stored in the image access memory device by a plurality of first oblique scanning The line scans a pair of the one-dimensional barcodes to obtain a sequence of first oblique sampling signals of the plurality of first oblique scanning lines; (h) the pair of the barcodes stored in the image access memory device Bar code image, Scanning a plurality of the one-dimensional barcodes by a plurality of second oblique scan lines to obtain a sequence of second oblique sampling signals of the plurality of second oblique scan lines; (i) the obtained sequence X The axial sampling signal, a sequence of Y axial sampling signals, a sequence of first oblique sampling signals, and a sequence of second oblique sampling signals form a sequence of sampling signals. (j) decoding the sequence sample signal by the one-dimensional image decoding engine to obtain one-dimensional barcode information; (k) outputting the one-dimensional barcode information to a display via a code information output interface. The image type high speed barcode scanning method according to claim 4, wherein the barcode information output interface is one of a USB, a serial output interface, and a parallel output interface.