CN110298209B - Three-dimensional code information reading system and method - Google Patents
Three-dimensional code information reading system and method Download PDFInfo
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- CN110298209B CN110298209B CN201910609225.XA CN201910609225A CN110298209B CN 110298209 B CN110298209 B CN 110298209B CN 201910609225 A CN201910609225 A CN 201910609225A CN 110298209 B CN110298209 B CN 110298209B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/143—Glyph-codes
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Abstract
The utility model provides a three-dimensional code information reading system and a method, wherein the system comprises the following steps: the photoelectric detector analyzes and outputs a level signal according to the light intensity signal of the emitted light reflected by the surface of the three-dimensional code. In the utility model, the light reflected by the concave area and the non-concave area of the three-dimensional code surface interfere based on opposite phases so as to limit the light intensity of the reflected light formed by the concave areas with different depths, thereby realizing the rapid reading of the three-dimensional code information.
Description
Technical Field
The utility model relates to the technical field of coding, in particular to a three-bit code information reading system and a three-dimensional code information reading method based on the system.
Background
The two-dimensional code is information of identifying the two-dimensional code by reading the color of the information unit through the scanning equipment. The two-dimensional code records data symbol information by using a certain specific set graph which is distributed on a plane according to a certain rule and is black-white, can store more information than the traditional one-dimensional bar code, can also represent more data types, and a user usually obtains the information stored in the two-dimensional code through decoding the two-dimensional code; among them, QR code is the most common one, and is also the two-dimensional bar code that supports encoding chinese characters at the earliest.
In order to increase the data capacity carried by the two-dimensional code with the planar structure, one mode is to make the two-dimensional code very large, but making the large two-dimensional code occupies too much area; the other mode is to make the dots of the two-dimensional code very small, however, the information expression of the two-dimensional code depends on the release and the area of the black-white dot matrix in the two-dimensional code graph, so that the graph acquisition requirement becomes very high during reading, usually high definition and low distortion are the most fundamental requirements, and if the dots of the two-dimensional code are made small, the correction of image distortion is not facilitated, and meanwhile, the resolution is limited. In order to solve the problem of small information storage amount of the traditional two-dimensional code, three-dimensional codes are currently generated. The Chinese patent publication No. CN206892906U discloses a three-dimensional code with a three-dimensional structure and an anti-counterfeiting structure, but the prior art does not solve the problem of how to read the information represented by the three-dimensional code with the three-dimensional structure in physical space.
In view of this, there is a need for an improvement in the three-dimensional code information reading method in the related art to solve the above-described problems.
Disclosure of Invention
The utility model aims to disclose a three-dimensional code information reading system and a three-dimensional code information reading method, which are used for realizing efficient and rapid reading of three-dimensional code information and are easy to identify the three-dimensional code information with a physical structure.
To achieve the first object, the present utility model provides a three-dimensional code information reading system, comprising: the photoelectric detector analyzes and outputs a level signal according to a light intensity signal of the emitted light reflected by the surface of the three-dimensional code.
As a further improvement of the utility model, the photoelectric detector restores the level signal into three-dimensional code information carried by the three-dimensional code through an analog-to-digital conversion circuit built in the photoelectric detector.
As a further improvement of the utility model, the number of the incident light rays with different wavelengths emitted by the light source is equal to the number of steps formed on the three-dimensional code surface.
As a further improvement of the present utility model, the wavelength of the incident light is 1/4 of the height difference between the step formed by the three-dimensional code surface and the lowest point of the three-dimensional code in the vertical direction.
As a further development of the utility model, the light source is an LED or a laser generator.
As a further improvement of the present utility model, the wavelength of the incident light emitted from the light source is 300 to 10000nm.
In order to achieve the second objective, the present utility model also discloses a three-dimensional code information reading method, which is characterized in that the three-dimensional code information reading system according to any one of the above utility models is used for scanning a three-dimensional code to restore the three-dimensional code information carried by the three-dimensional code according to the emitted light reflected by the surface of the three-dimensional code.
Compared with the prior art, the utility model has the beneficial effects that: according to the method, the wavelength of the incident light rays entering the three-dimensional code surface is selected to be 1/4 of the height difference between the step formed by the three-dimensional code surface and the lowest point of the three-dimensional code surface in the vertical direction, the incident light rays with different wavelengths contained in the incident light rays are determined according to the step formed by the three-dimensional code surface and the height difference, so that the light rays reflected by the concave area and the non-concave area of the three-dimensional code surface interfere based on opposite phases, the light intensity of the reflected light rays formed by the concave area with different depths is limited, and the three-dimensional code information carried by the three-dimensional code based on the concave area and the non-concave area is determined based on different light intensities, so that the three-dimensional code information is rapidly read.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional code information reading system according to the present utility model;
FIG. 2 is a partial microscopic schematic view of a three-dimensional code surface having three steps;
fig. 3 is a schematic diagram of the photo detector according to the analysis of the light intensity signal of the emitted light reflected by the three steps shown in fig. 2 and outputting the resulting level signal.
Detailed Description
The present utility model will be described in detail below with reference to the embodiments shown in the drawings, but it should be understood that the embodiments are not limited to the present utility model, and functional, method, or structural equivalents and alternatives according to the embodiments are within the scope of protection of the present utility model by those skilled in the art.
An embodiment of a three-dimensional code information reading system according to the present utility model is disclosed with reference to fig. 1 to 3. Meanwhile, the three-dimensional code information reading method disclosed by the utility model is realized based on the system. The three-dimensional code information reading system will be described with emphasis. The three-dimensional code information reading method is based on the three-dimensional code information reading system to scan the three-dimensional code 50 so as to restore the three-dimensional code information carried by the three-dimensional code 50 according to the emitted light reflected by the surface of the three-dimensional code 50.
The three-dimensional code information reading system is used for reading three-dimensional code information carried by concave-convex steps and pits (namely, concave areas) formed on the surface of the tiled three-dimensional code 50 in fig. 1 so as to restore the information carried by the three-dimensional code. The three-dimensional code may be attached to any trademark or commodity packaging surface having physical characteristics.
In this embodiment, the three-dimensional code information reading system includes: the light source 10 is used for emitting incident light rays with different wavelengths, the collimating lens 20 and the beam expanding lens 30 are used for receiving the incident light rays, the parallel light rays formed by the beam expanding lens 30 are received by the beam splitter 40 and vertically incident to the surface of the three-dimensional code step, the emitted light rays reflected by the surface of the three-dimensional code are received by the beam splitter and are input to the photoelectric detector 60, and the photoelectric detector 60 analyzes and outputs a level signal according to the light intensity signal of the emitted light rays reflected by the surface of the three-dimensional code.
Referring to fig. 1, the light source 10 emits incident light rays having several different wavelengths, and the number of wavelengths or wavelength ranges of the incident light rays is equal to the number of steps (or pits) formed by the cladding of the three-dimensional code 50. For simplicity of representation, as shown in connection with fig. 2 and 3, in the present embodiment, the surface of the three-dimensional code 50 forms three steps, and thus three pits (Y 1 ) Pit (Y) 2 ) Pit (Y) 3 ) The method comprises the steps of carrying out a first treatment on the surface of the The three-dimensional code 50 is defined as a land at its highest point in the vertical direction. Due to the passage of light of different wavelengths through the three-dimensional code 50 tableThe light intensity signals formed after the reflection of the different morphologies are different, so that the reflected signals of different light intensities reflected by the three-dimensional code 50 received by the beam splitter 40 can be received by the photodetector 60, and the three-dimensional code 50 can be restored based on the information carried by the different morphologies by the built-in analog-digital conversion circuit (AD conversion circuit) thereof. Such information carried by the three-dimensional code 50 may be attribute information of the commodity, or may be anti-counterfeiting information of the commodity or other types of encryption information. The photoelectric detector 60 restores the level signal into the three-dimensional code information carried by the three-dimensional code 50 through an analog-to-digital conversion circuit built in the photoelectric detector.
In this embodiment, the number of incident light beams with different wavelengths emitted from the light source 10 is equal to the number of steps formed on the three-dimensional code surface. The wavelength of the incident light is 1/4 of the height difference between the step formed by the three-dimensional code surface and the lowest point of the three-dimensional code in the vertical direction. The light source 10 is an LED or a laser generator. The wavelength of the incident light emitted by the light source 10 is a composite light source in the range of 300-10000 nm (near ultraviolet to infrared band), and the corresponding step depth should be in the range of 75-2500 nm. For example: the three-dimensional code 50 has three pits of different depths (Y 1 ) Pit (Y) 2 ) Pit (Y) 3 ) The depths of (a) are 75nm, 100nm, 150nm, respectively, and the wavelengths of the incident light rays included in the corresponding light source 10 are 300nm, 400nm, 600nm, respectively. The number of steps formed by the three-dimensional code 50 is generally three or more, and the number of incident light rays of different wavelengths contained in the light source 10 corresponds to the number of pits formed by the three-dimensional code 50.
Specifically, in the present embodiment, the surface of the three-dimensional code 50 forms three steps, and thereby three pits, that is, pits (Y 1 ) Pit (Y) 2 ) Pit (Y) 3 ) The method comprises the steps of carrying out a first treatment on the surface of the The three-dimensional code 50 is defined as a land at its highest point in the vertical direction. The incident light rays emitted downwards by the light source 10 respectively comprise a wavelength lambda 1 、λ 2 、λ 3 These three different wavelengths of incident light. The incident light passes through a collimator lens 20 (collimator lens) to form a point light source from the light source 10 into parallel light 21, and further passes through a beam expander lens (expander lens) toThe parallel light 21 is subjected to beam expansion processing to form parallel light 31, and the parallel light 31 is input into the beam splitter 40. The beam expander lens is used to expand the diameter of the parallel input beam to a larger parallel output beam, i.e. parallel light 31 in fig. 1. The beam splitter 40 is used for splitting the parallel light 31 containing different wavelengths at the same time based on wavelength to scan the surface of the three-dimensional code 50 by the scanning beam of the wavelength of a specific range and further receives the reflected light reflected by the surface of the three-dimensional code 50. For simplicity of illustration, the plurality of scanning beams of different wavelengths formed from beam splitter 40 and the light reflected off the surface of three-dimensional code 50 are collectively marked with light 41, and those skilled in the art will recognize that such light 41 is a bi-directional light path and is in a sequential order. The scanning beam is perpendicularly irradiated on the surface of the three-dimensional code 50. When the scanning beam is projected on the land-forming area, the scanning beam is totally reflected, and when the scanning beam is projected on the pit, a curvature occurs at the surrounding wavefront of the pit.
In the present embodiment, since the wavelength of the incident light (i.e., the plurality of scanning light beams having different wavelengths formed from the beam splitter 40) is 1/4 of the height difference between the step formed by the three-dimensional code surface with respect to the lowest point of the three-dimensional code in the vertical direction, and specifically: incident light lambda 1 Is a pit (Y) 1 ) 1/4 of the vertical height formed between the land and the land, incident light lambda 2 Is a pit (Y) 2 ) 1/4 of the vertical height formed between the land and the land, incident light lambda 3 Is a pit (Y) 3 ) 1/4 of the vertical height formed between the land and the land. Based on the above-mentioned wavelength and pit depth types and wavelength selection, the reflected light of pit and land is opposite in phase and destructively interfered to limit pit (Y) 1 ) Pit (Y) 2 ) Pit (Y) 3 ) The beam splitter 40 receives the reflected light rays with different light intensities and sends the received reflected light rays to the photodetector 60, and the reflected light rays are detected in light intensity, i.e., the light intensity signal is analyzed and the level signal is output. As shown in fig. 2 and 3, the scanning beam scanned by the beam splitter 40 toward the surface of the three-dimensional code 50 is incident on the surface of the three-dimensional code 50(X 1 ) And shore (X) 2 ) The intensity of the reflected light is higher than that of the pit (Y 1 ) Pit (Y) 2 ) Pit (Y) 3 ) The intensity of the reflected light formed, and pits (Y 1 ) Pit (Y) 2 ) Pit (Y) 3 ) The intensity of the reflected light formed decreases in sequence. The intensity of the reflected light is captured by the photodetector 60 and a level signal, i.e., lambda 1 Signal 61, lambda 3 Signal 62 and lambda 3 The signal 63 restores the level signal into three-dimensional code information carried by the three-dimensional code 50 through an analog-digital conversion circuit built in the signal 63, so that the information represented by the three-dimensional code 50 based on the surface morphology is efficiently and accurately detected through the light intensity detection of the reflected light formed by the three-dimensional code 50.
The above list of detailed descriptions is only specific to practical embodiments of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications that do not depart from the spirit of the present utility model should be included in the scope of the present utility model.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A three-dimensional code information reading system, comprising: the three-dimensional code surface is characterized by comprising a light source (10) which is used for emitting incident light rays with different wavelengths and is matched with the vertical depth of the three-dimensional code surface, a collimating lens (20) and a beam expanding lens (30) which are used for receiving the incident light rays, the parallel light rays formed by the beam expanding lens (30) are received by a beam splitter (40) and vertically incident on the surface of the three-dimensional code step, the emitted light rays reflected by the surface of the three-dimensional code are received by the beam splitter and are input to a photoelectric detector (60), the photoelectric detector (60) analyzes and outputs level signals according to the light intensity signals of the emitted light rays reflected by the surface of the three-dimensional code, the wavelength of the incident light rays is 1/4 of the height difference between the step formed by the surface of the three-dimensional code and the lowest point of the three-dimensional code in the vertical direction, the three-dimensional code surface forms the steps carrying three-dimensional code information and having concave-convex fluctuation, and the quantity of the incident light rays with different wavelengths emitted by the light source (10) is equal to the quantity of the steps formed by the surface of the three-dimensional code.
2. The three-dimensional code information reading system according to claim 1, wherein the photodetector (60) restores the level signal to three-dimensional code information carried by the three-dimensional code through an analog-to-digital conversion circuit built therein.
3. The three-dimensional code information reading system according to claim 1, wherein the light source (10) is an LED or a laser generator.
4. The three-dimensional code information reading system according to claim 1, wherein the wavelength of the incident light emitted from the light source (10) is 300 to 10000nm.
5. A three-dimensional code information reading method, characterized in that the three-dimensional code information carried by the three-dimensional code is restored by scanning the three-dimensional code using the three-dimensional code information reading system according to any one of claims 1 to 4, based on the emitted light reflected by the surface of the three-dimensional code.
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