CN111950317B - Microcosmic coding image extraction device and method for identifying authenticity after extracting image - Google Patents
Microcosmic coding image extraction device and method for identifying authenticity after extracting image Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000000605 extraction Methods 0.000 title claims abstract description 14
- 238000003384 imaging method Methods 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000031700 light absorption Effects 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims description 14
- 239000011159 matrix material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010147 laser engraving Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
- G06K19/06046—Constructional details
- G06K19/06121—Constructional details the marking having been punched or cut out, e.g. a barcode machined in a metal work-piece
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
- G06K19/06046—Constructional details
- G06K19/06159—Constructional details the marking being relief type, e.g. three-dimensional bar codes engraved in a support
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/51—Housings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
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Abstract
The embodiment of the invention discloses a microcosmic coded image extraction device and a method for identifying authenticity after extracting microcosmic coded images, wherein the device comprises a shell and an imaging device, the shell comprises at least two opposite side walls and a top wall connected with the at least two side walls, a detection opening is formed in one side opposite to the shell and the top wall, light sources are arranged on the at least two side walls, a light absorption layer is arranged on the inner side of the top wall, the top wall is provided with an imaging opening, and a lens of the imaging device is fixed on the imaging opening and is arranged towards the detection opening. According to the technical scheme, the light source is controlled to emit light to irradiate the plane to be extracted and reflect the light to the imaging device to extract the microcosmic coded image, so that authenticity of the microcosmic coded image can be accurately identified.
Description
Technical Field
The embodiment of the invention relates to a microcosmic coding image technology, in particular to a microcosmic coding image extracting device and a method for identifying authenticity after extracting microcosmic coding images.
Background
The microcoded image may be a tiny image formed by arranging a plurality of points according to a certain rule, and the image can be extracted and decoded by a special device. The ink is printed on the surface of a medium such as a paper film to form a coded image, the ink absorbs light with specific wavelength emitted by special equipment, the other areas reflect the light, the image is captured by a camera, and dark spots are formed in the image at the places where the ink exists, so that an image of a microcosmic coded image is obtained.
The concave-convex microcosmic coded image of the metal reflecting surface can be formed by a laser engraving method. Carving the points on the metal reflective surface by laser to form pits; if the code points are engraved on the die by laser, the die-cast target metal surface can form protruding points through a die-casting process.
The concave-convex microcosmic coding image of the metal reflecting surface consists of a plurality of code points, and each code point is concave point or convex point. Each code point is microscopically seen to have the reflective properties of a concave mirror or a convex mirror. The periphery of the code point is a plane, and has the reflection characteristic of a plane mirror.
The concave mirror has an optical property that light incident in parallel is reflected and concentrated and then dispersed, and the convex mirror has an optical property that light incident in parallel is reflected and dispersed.
Such optical properties are different from those of a conventional microcoded image formed by attaching light-absorbing ink to the surface of a commodity or an outer package (where the ink dots absorb light and appear as dark spots in the resulting image), and a special device is required to extract the coded image.
When the laser is used for carving the metal reflecting surface, the size of the carved point can be controlled by controlling parameters such as the intensity of the laser, and the like, the forging of the same microcoded image on the metal reflecting surface is difficult, and particularly when the same microcoded image contains a plurality of code point sizes, the restoration of all the code point sizes is more difficult. To correctly identify the authenticity of the embossed microscopic encoded image of the metal retroreflective surface, a more realistic image and a suitable algorithm are required.
Disclosure of Invention
The embodiment of the invention provides a microcosmic coded image extraction device and a method for identifying authenticity after extracting microcosmic coded images, so as to better extract concave-convex microcosmic coded images on a metal reflecting surface and identify authenticity, thereby achieving the purposes of tracing and identifying authenticity.
In a first aspect, an embodiment of the present invention provides a microcoded image extraction apparatus, including a housing and an imaging device, where the housing includes at least two opposite sidewalls and a top wall connecting the at least two sidewalls, a detection opening is provided on an opposite side of the housing and the top wall, the at least two sidewalls are provided with light sources, a light absorption layer is provided on an inner side of the top wall, the top wall is provided with an imaging opening, and a lens of the imaging device is fixed to the imaging opening and is disposed towards the detection opening.
Optionally, the number of the side walls is 4-8.
Optionally, the included angle between the side wall and the top wall is greater than 90 degrees.
Optionally, the light source is a surface light source or a light source matrix arranged on the side wall.
Optionally, the imaging device comprises an optical lens and an image sensor;
And the optical lens collects the light reflected back after the light source irradiates the detection opening, and maps the light to the image sensor to form a microcosmic coded image.
In a second aspect, the embodiment of the present invention further provides a method for identifying authenticity after extracting a microcoded image, including:
Emitting light rays at a first angle to irradiate a surface to be detected, wherein the surface to be detected comprises a plurality of convex points or concave points which are arranged at intervals;
the imaging device shoots the surface to be detected at a second angle to obtain a microcosmic coded image, wherein the microcosmic coded image comprises a plurality of bright spots corresponding to convex points or concave points;
And judging the authenticity of the surface to be detected according to the microcosmic coded image and a preset standard microcosmic coded image.
Optionally, the determining the authenticity of the surface to be detected according to the microcosmic coded image and the preset standard microcosmic coded image includes:
acquiring position information and size information of all bright spots in the microcosmic coded image;
Judging whether the position information of all the bright spots is matched with the position relation of a preset standard microcosmic coded image or not;
if yes, confirming that a corresponding microcosmic coding image unit is found;
Confirming the size grades of all the bright spots of the microcosmic coding image unit according to a preset rule, wherein the bright spot of each size grade corresponds to a size range;
Judging whether the average value of the sizes of all the bright spots of each size grade is within a preset range;
if yes, further judging whether the number of the bright spots exceeding the size range of the bright spots preset by the corresponding size grade in the bright spots of each size grade is within the range of the preset requirement;
If yes, confirming that the microcosmic coded image is a real image.
Optionally, the acquiring the position information and the size information of all the bright spots in the microcosmic coded image includes:
Acquiring a brightness value of each pixel in the microcosmic coded image;
The ratio of the brightness value of each pixel to the brightness value of the surrounding pixels is calculated to confirm the position information and the size information of each bright point.
According to the technical scheme, the light source is controlled to emit light to irradiate the plane to be extracted and reflect the light to the imaging device to extract the microcosmic coded image, so that authenticity of the microcosmic coded image can be accurately identified.
Drawings
FIG. 1 is a schematic diagram of a microcoded image extraction apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an apparatus for a light path when a reflection point on a plane to be extracted is a plane in a first embodiment of the present invention;
FIG. 3 is a schematic diagram of an apparatus for a light path when a reflection point on a plane to be extracted is a pit in a first embodiment of the present invention;
FIG. 4 is a flow chart of a method for verifying authenticity after extracting a microcoded image according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of a microcoded image unit in a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts steps as a sequential process, many of the steps may be implemented in parallel, concurrently, or with other steps. Furthermore, the order of the steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Furthermore, the terms "first," "second," and the like, may be used herein to describe various directions, acts, steps, or elements, etc., but these directions, acts, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first speed difference may be referred to as a second speed difference, and similarly, a second speed difference may be referred to as a first speed difference, without departing from the scope of the application. Both the first speed difference and the second speed difference are speed differences, but they are not the same speed difference. The terms "first," "second," and the like, are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Example 1
Fig. 1 is a schematic diagram of a microcoded image extraction apparatus according to a first embodiment of the present invention, and the embodiment of the present invention is applicable to a microcoded image extraction case. Referring to fig. 1, a microcoded image extraction apparatus according to an embodiment of the present invention specifically includes a housing 1 and an imaging device 2. The housing 1 comprises at least two opposite side walls 11 and a top wall 12 connecting the at least two side walls 11, alternatively the number of side walls may be 4-8. The angle between the side wall 11 and the top wall 12 is greater than 90 degrees. The opposite side of the housing 1 to the top wall 12 is provided with a detection opening 13, the at least two side walls 11 are provided with light sources 14, and the light sources 14 are surface light sources or light source matrixes arranged on the side walls 11. Inside the top wall 12, a light absorbing layer 15 is provided for absorbing light impinging on the light absorbing surface thereof. The top wall 12 is provided with an imaging opening 16, and the lens of the imaging device 2 is fixed to the imaging opening 16 and disposed toward the detection opening 13. The imaging device 2 includes an optical lens 21 and an image sensor 22; the optical lens 21 collects the light reflected back from the light source 14 after being irradiated out of the detection opening 13, and maps the light to the image sensor 22 to form a microcosmic coded image.
When the microcosmic coded image is extracted, the detection opening 13 of the device is arranged on a plane to be extracted, and as pits and bumps exist on the plane to be extracted, light emitted by the light source 14 reaches the optical lens 21 and the image sensor 22 to form an image after being reflected by the plane to be extracted, and the image sensor 22 converts the image into corresponding image signals according to the difference of the optical characteristics of the pits and the bumps.
The following describes the schematic device of the light path when a certain reflection point on the plane to be extracted is a plane and a concave point.
As shown in fig. 2, when a certain reflection point on the plane to be extracted is a plane, light (reflected light) emitted from any point on the light absorbing layer 15 at a specific angle reaches the plane to be extracted, and then reflected to the optical lens 21 to reach the image sensor 22. The light is weak due to the light absorbing properties of the light absorbing layer 15, i.e. the spots presented on the image sensor 22 are darker spots. The light absorbing layer 15 constitutes a light absorbing surface with a myriad of such points on which a darker image will be formed when mapped to an image sensor.
As shown in fig. 3, when a certain reflecting point on the plane to be extracted is a concave point, since the concave point is microscopically similar to a concave mirror, the normal line of the reflecting point on most areas in the concave point area is not perpendicular to the plane to be extracted, that is, the light emitted from the certain luminous point on the light source 14 and directed to the reflecting point is reflected and reaches the image sensor 22 through the optical lens 21. Since the light source 14 itself is self-luminous and has a brightness much greater than the reflected light on the light absorbing layer 15, the brightness at the pits in the resulting image is significantly higher than at the periphery, forming bright spots. Similarly, when a certain reflection point on the plane to be extracted is a convex point, the brightness of the convex point is obviously higher than the periphery of the convex point in the finally obtained image based on a similar principle, so that the bright point is formed.
It should be noted that, due to the imaging principle of the concave mirror and the convex mirror, each pit or bump is dark in the microscopic view in the partial area of the image (the image of the light-absorbing layer and the lens) in the image sensor, but because the single pit or bump is small, the effect of this darker area in the image of the single pit or bump is negligible and can be regarded as a bright spot.
The device can well extract the image of the microcosmic coded image formed by pits or bumps serving as code points on the reflecting surface of the mirror surface, and more accurately identify the authenticity of the microcosmic coded image.
Example two
Fig. 4 is a flow chart of a method for identifying authenticity after extracting a microcoded image according to a second embodiment of the present invention. The microcoded image needs to be generated on the metal retroreflective surface prior to extraction of the microcoded image. When the original image is generated, according to a preset algorithm, the sizes of all code points in the generated micro coding image unit are not identical, namely, two or more code point sizes can be provided, and the size of each code point is determined by the preset algorithm. As shown in fig. 5, the size of each code point in the microcoded image unit is not exactly the same. Thus, when the image is engraved on the metal reflecting surface or the mold by laser, the size of each code point on the metal reflecting surface or the mold can be controlled. The generated microcosmic coding original image is carved on the reflecting surface of metal by a certain technology (such as laser carving) or carved on a mould and then is cast to the target metal surface. After the microcoded image is generated on the surface of the target metal, the microcoded image on the reflective surface of the metal can be obtained and the authenticity can be identified by the microcoded image extraction device according to the first embodiment of the invention. Referring to fig. 4, a method for identifying authenticity after extracting a microcoded image according to an embodiment of the present invention includes:
step S110, emitting light rays at a first angle to irradiate a surface to be detected, wherein the surface to be detected comprises a plurality of convex points or concave points which are arranged at intervals. Specifically, the light source emits light at a first angle to irradiate the surface to be detected, so that the light reflected back from the surface to be detected can enter the imaging opening to reach the imaging device.
And step S120, the imaging device shoots the surface to be detected at a second angle to obtain a microcosmic coded image, wherein the microcosmic coded image comprises a plurality of bright spots corresponding to the convex points or the concave points. Specifically, the optical lens of the imaging device collects the reflected light, and maps the reflected light to the image sensor to form a microcosmic coded image.
And step 130, judging whether the surface to be detected is true or false according to the microcosmic coded image and a preset standard microcosmic coded image.
Specifically, after the image sensor generates the microcoded image, it includes:
step S131, position information and size information of all bright spots in the microcosmic coded image are obtained.
Specifically, a brightness value of each pixel in the microcosmic coded image is obtained; the ratio of the brightness value of each pixel to the brightness value of the surrounding pixels is calculated to confirm the position information and the size information of each bright point. Specifically, each pixel in the image is traversed, the brightness value of the pixel is calculated relative to the values of the surrounding pixels, and whether the pixel is a bright spot is judged. When the light spot is judged to be a bright spot, calculating the center coordinate of the bright spot and calculating the size of the bright spot. And sequentially judging all the bright spots in the image, calculating the center coordinates and the size of the bright spots, and storing the bright spots.
Step S132, judging whether the position information of all the bright spots is matched with the position relation of the preset standard microcosmic coded image.
Specifically, traversing the position relation of each bright spot and the surrounding bright spots, and judging whether the position relation is matched with the position relation of a preset standard microcosmic coded image.
In step S133, if yes, it is confirmed that the corresponding micro-encoded image unit is found.
Specifically, when the information is matched with the set position relation, the information contained in the microcoded image unit is further calculated after the microcoded image unit is found. If not, the metal reflective surface is not provided with a corresponding microcosmic coded image.
Step S134, confirming the size grades of all the bright spots of the microcoded image unit according to a preset rule, wherein the bright spot of each size grade corresponds to a size range.
For example, according to a preset rule, the size levels of the bright spots of the microcosmic encoded image unit include two levels of small code points and large code points, wherein the number of the small code points is 9, the size range is 60-70, the number of the large code points is 5, and the size range is 120-140. The sizes of 9 small code points in 14 code points in a frame image obtained through actual calculation are 66, 60, 63, 71, 68, 58, 61, 64 and 70, and the sizes of 5 large code points are 112, 134, 128, 138 and 132.
Step S135, judging whether the average value of the sizes of all the bright spots of each size level is within a preset range.
For example, the sizes of 9 small code points in a frame of image obtained by actual calculation are 66, 60, 63, 71, 68, 58, 61, 64 and 70 respectively, and the average value of the small code points is (66+60+63+71+68+58+61+64+70)/9= 64.56, which is between the preset small code point size ranges 60 to 70; the sizes of the 5 large code points are 112, 134, 128, 138 and 132 respectively, the average value is (112+134+128+138+132)/5=128.8, and the size ranges between 120 and 140 of the preset large code points can be used for the next step. If the calculated average value is not within the preset range, the false discrimination is judged to be failed, and the microscopic coded image is possibly a forged image or is possibly subject to random interference such as dust, image noise and the like to cause the false discrimination to be failed.
Step S136, if yes, further judging whether the number of the bright spots exceeding the preset bright spot size range of the corresponding size grade in the bright spots of each size grade is within the preset requirement range.
For example, according to a preset rule, the number of code points exceeding the preset code point size range 60 to 70 in the small code points cannot exceed 2, and the number of code points exceeding the preset code point size range 120 to 140 in the large code points cannot exceed 1. In the frame image, two small code points with the code point sizes of 71 and 58 exceed the preset code point size range 60-70, the number of the small code points is 2, the large code point with the code point size of 112 exceeds the preset code point size range 120-140 in the allowable range, the number of the large code point with the code point size of 112 exceeds the preset code point size range 120-140, and the number of the large code point with the code point size of 1 in the allowable range, and the false identification is judged.
And step S137, if yes, confirming that the microcosmic coded image is a real image.
Specifically, if the number of the bright spots exceeding the size range of the bright spots preset by the corresponding size grade in the bright spots of each size grade is within the range of the preset requirement, confirming that the microcosmic coded image is a real image; if the number of the bright spots exceeding the range of the preset bright spot size of each size grade is not within the range of the preset requirement, the false identification is judged to be failed, and the microcosmic coded image is possibly a forged image or is possibly subjected to random interference such as dust, image noise and the like to cause the false identification to be failed.
In the embodiment of the invention, a certain number of code points are allowed to exceed the range preset by the level, and the fault tolerance requirement in actual production is considered, so that the precision of the image is strictly required, and a certain degree of production tolerance is allowed.
According to the technical scheme provided by the embodiment of the invention, the authenticity is more accurately identified by judging the size grade of the bright spots of the microcosmic coded image.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. The microcosmic coding image extracting device is characterized by comprising a shell and an imaging device, wherein the shell comprises at least two opposite side walls and a top wall connected with the at least two side walls, a detection opening is formed in one side of the shell opposite to the top wall, a light source is arranged on the at least two side walls, a light absorption layer is arranged on the inner side of the top wall, an imaging opening is formed in the top wall, and a lens of the imaging device is fixed to the imaging opening and is arranged towards the detection opening;
the detection opening is arranged on a plane to be extracted; the plane to be extracted comprises a plurality of concave points or convex points which are arranged at intervals;
Light emitted by the light source passes through the light absorption layer and the plane to be extracted and is reflected to the imaging device to form a darker background image;
Light emitted by the light source passes through concave points or convex points on the plane to be extracted and is reflected to the imaging device to form bright spots.
2. The apparatus according to claim 1, wherein the number of the side walls is 4 to 8.
3. The microcoded image extraction device of claim 1 wherein the side walls form an angle of greater than 90 degrees with the top wall.
4. The microcoded image extraction apparatus of claim 1 wherein the light source is a surface light source or a matrix of light sources disposed on the side walls.
5. The microcoded image extraction apparatus of claim 1 wherein the imaging means comprises an optical lens and an image sensor;
And the optical lens collects the light reflected back after the light source irradiates the detection opening, and maps the light to the image sensor to form a microcosmic coded image.
6. A method for identifying authenticity after extracting a microcosmic coded image, comprising:
Emitting light rays at a first angle to irradiate a surface to be detected, wherein the surface to be detected comprises a plurality of convex points or concave points which are arranged at intervals;
The imaging device shoots the surface to be detected at a second angle to obtain a microcosmic coded image, wherein the microcosmic coded image comprises a plurality of bright points corresponding to convex points or concave points and a darker background image; the bright spots are formed by the light rays which pass through concave points or convex points on the surface to be detected and are reflected to the imaging device; the darker background image is formed by the light rays which are reflected to the imaging device through the light absorption layer and the surface to be detected;
judging the authenticity of the surface to be detected according to the microcosmic coded image and a preset standard microcosmic coded image; the judging the authenticity of the surface to be detected according to the microcosmic coded image and a preset standard microcosmic coded image comprises the following steps:
acquiring position information and size information of all bright spots in the microcosmic coded image;
Judging whether the position information of all the bright spots is matched with the position relation of a preset standard microcosmic coded image or not;
if yes, confirming that a corresponding microcosmic coding image unit is found;
Confirming the size grades of all the bright spots of the microcosmic coding image unit according to a preset rule, wherein the bright spot of each size grade corresponds to a size range;
Judging whether the average value of the sizes of all the bright spots of each size grade is within a preset range;
if yes, further judging whether the number of the bright spots exceeding the size range of the bright spots preset by the corresponding size grade in the bright spots of each size grade is within the range of the preset requirement;
If yes, confirming that the microcosmic coded image is a real image.
7. The method for verifying the authenticity after extracting a microcoded image according to claim 6, wherein said obtaining the position information and the size information of all the bright spots in said microcoded image comprises:
Acquiring a brightness value of each pixel in the microcosmic coded image;
The ratio of the brightness value of each pixel to the brightness value of the surrounding pixels is calculated to confirm the position information and the size information of each bright point.
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