WO2012083711A1

WO2012083711A1 - Banknote detection method and device

Info

Publication number: WO2012083711A1
Application number: PCT/CN2011/078786
Authority: WO
Inventors: 陈新; 李蒙; 唐辉; 成和建; 鲍东山
Original assignee: 北京新岸线软件科技有限公司
Priority date: 2010-12-23
Filing date: 2011-08-23
Publication date: 2012-06-28
Also published as: CN102096962A

Abstract

A banknote detection method, involves providing an image obtaining unit, a light source and a banknote conveying passage in a banknote identification device wherein the image obtaining unit and the light source are respectively disposed on two sides of the banknote conveying passage of the banknote identification device. The method comprises, during the process of a banknote to be detected passing through the banknote conveying passage, the image obtaining unit collecting a full amplitude image of the banknote via transmission light transmitted through the banknote by the light source and processing the image; extracting anti-counterfeiting feature information from the processed full amplitude image; judging the banknote as genuine or counterfeit based on the processed image and/or anti-counterfeiting feature information. A corresponding device is also provided in the invention. The banknote detection solution provided by the invention can avoid the limitation of algorithm and processing of reflective imaging, be easily implemented with a low cost, and realize fast and accurate detection, so as to accurately detect counterfeit banknotes. The solution has a remarkable effect for authentication of altered currency. The invention can also provide accurate detection on complementary opposite printing type features of offset printing.

Description

Banknote detecting method and device

The invention relates to the technical field of image processing and recognition, and particularly relates to a banknote detecting method and device. Background technique

Maintaining the financial order and the public interest, and strictly preventing counterfeit money from flowing into the market, is a matter of particular concern to financial management institutions. The core issue in the field of financial instruments is the authentication of banknotes. Reflective imaging methods based on CMOS/CIS and other image acquisition devices have been widely used in banknote inspection machines such as conventional banknote counters and sorters. As counterfeit currency production technology becomes more and more high, it is necessary to propose more efficient and effective means to solve the problems of counterfeiting currency and currency correction in reality.

The existing banknote counterfeiting system mainly uses CMOS or contact image sensor CIS to reflect the image, obtains the anti-counterfeit logo image, performs processing, and recognizes the processed anti-counterfeit logo image to determine the authenticity of the detected banknote.

In addition, according to the search, among the various solutions for currency authentication proposed by technicians in some countries in Japan and Europe, a large number of imaging mechanisms based on reflective single-wavelength light use multiple wavelengths of light in the same device. Some technical solutions are being developed by some manufacturers, but they are not yet in practical use.

In conventional systems, imaging is considered to simulate the visual effects of the human eye, so a large number of reflective imaging mechanisms exist for reflection imaging recognition such as CMOS, or line CCD or other image acquisition equipment. The limitation of reflective imaging is that the recognition algorithm is complex and the hardware structure is complicated. Because the money detector is sent to the front and back and the direction of banknote input, there are 4 cases in which the same banknote is sent into the banknote verification device, that is, 4 possible images are obtained. First, in order to identify in any direction, at least two sets of imaging equipment and light sources are required, resulting in increased hardware costs, complicated mechanical structure, high product cost, and difficulty in productization.

The existing banknote counterfeiting system, its performance depends directly on the illumination effect of the light source, and whether it needs to be photographed multiple times (such as mixed-point reflective number recognition, at least two CMOS, linear array CCD or CIS X are required in the light source Selectively has a single inflexible defect, and hardware equipment costs are high. For example, if infrared features need to be detected, the light source must be fixed to an infrared source based on the reflection recognition of a CMOS or linear array CCD or CIS or other image collection device, and At least two imaging devices must be used to ensure the shooting of positive and negative images. Therefore, for different countries' currencies, products must be customized according to the characteristics, resulting in many types of product lines, difficult to product and many other issues. The number of hardware is large, the product debugging cycle is relatively long, the equipment wiring is complicated, and the productization cycle of the product is relatively long. This is undoubtedly a serious lag in the advent of such products in the need to quickly cope with the counterfeit currency that is constantly updated and developed. In the market demand. In such devices based on reflective imaging, these problems cannot be avoided. Under the premise that the system authentication principle does not change, these inherent problems cannot be fundamentally solved. Summary of the invention

The invention provides a banknote detecting method and device, which adopts transmitted light irradiation to obtain a full-size image of a banknote to be tested, and processes the collected full-size image; and determines the authenticity of the banknote according to the processed image. The counterfeit currency can be accurately detected, especially for the counterfeiting of the altered currency, and the effect is more obvious.

An embodiment of the present invention provides a method for detecting a banknote. The banknote identification device is provided with an image acquisition unit, a light source, and a light path. The image acquisition unit and the light source are respectively located on two sides of the banknote identification device. Methods include:

During the passage of the banknote to be tested, the light source illuminates the banknote to be tested, and the image acquisition unit uses the light source to collect the full-size image of the banknote through the transmitted light of the banknote, and processes the collected full-size image;

Extracting anti-counterfeiting feature information from the processed full-size image;

The authenticity of the banknote is determined based on the processed image and/or security feature information.

Preferably, the light source emits light of different wavelengths in a time-sharing manner to illuminate the banknote to be tested, and collects a full-size image of the banknote, specifically comprising:

During the process of the banknotes to be tested passing through the banknote passage, the images of the respective wavelengths of light are respectively collected; for each wavelength of light, an image is formed after each banknote passes through the banknote passage.

More preferably, before the banknote detection, the method further includes:

The banknote is detected to pass through the entrance of the banknote passage, the light source is turned on, and the image acquisition unit is triggered to start collecting images on the banknote.

A banknote detecting device provided by an embodiment of the invention has an image acquiring unit, a light source, and a banknote passage;

The image obtaining unit and the light source are respectively located on two sides of the banknote passage of the banknote identification device; in the process that the banknote to be tested passes through the banknote passage, the light source illuminates the banknote to be tested, and the image acquisition unit transmits the transmitted light of the banknote by using the light source. Collecting an image of the anti-counterfeit mark on the banknote;

The device also includes: An image processing unit, configured to process the collected full-size image, and extract the anti-counterfeiting feature information;

The determining unit determines the authenticity of the banknote based on the processed image and/or the security feature information. More preferably, the light source emits a single wavelength of light to illuminate the banknote to be tested, and after each banknote passes through the banknote passage, the image acquisition unit collects and forms an image;

Preferably, the light source emits light of different wavelengths in time to illuminate the banknote to be tested, and in the process of the banknote to be tested passing through the banknote passage, the image acquisition unit separately collects images when each wavelength of light is irradiated; Thereafter, for each wavelength of light, an image is formed accordingly.

More preferably, the banknote detecting device further comprises:

The detecting unit is disposed at the entrance of the banknote passage for detecting the banknote entering the walking channel; when detecting that the banknote passes through the entrance of the banknote channel, the detecting unit sends an indication signal, turns on the light source, and triggers the image acquiring unit to start collecting An image on the banknote.

More preferably, the banknote detecting device further comprises:

The serial port or USB interface is connected to the image processing unit or / and the decision unit for debugging and upgrading the image processing unit or / and the decision unit.

In summary, the banknote detection technical solution provided by the present invention uses transmitted light to obtain a full-size image of the banknote to be tested, and processes the collected full-size image; and extracts the security feature information from the processed full-size image. And determining the authenticity of the banknote based on the processed image and/or the security feature information. This overcomes the limitations of reflective imaging algorithms. The banknote detection solution provided by the invention is easy to implement, has low realization cost, and is quick and accurate to detect, so that the counterfeit currency can be accurately detected, especially for the identification of the altered currency, and the effect is more obvious. For offset complementary fingerprint features, the present invention can perform accurate detection and overcome the drawbacks that reflective imaging cannot be detected in principle. DRAWINGS

1 is a flow chart of a method for detecting a banknote provided by the present invention;

2 is a schematic structural view of a banknote detecting device provided by the present invention;

3 is a schematic structural view of a banknote detecting device according to an embodiment of the present invention;

4 is a flow chart of a method for detecting a banknote provided in an embodiment of the present invention;

Figure 5a is a full-size image captured in an embodiment of the present invention;

Figure 5b shows the image after pre-processing the image of the banknote in Figure 5a;

Figure 5c shows an image of the image of the banknote in Figure 5b;

Figure 6a is a diagram showing a full-size image collected in another embodiment of the present invention; FIG. 6b is an image obtained by binarizing the full-size image of FIG. 5a; FIG. 7 is a schematic diagram showing the structure of a banknote detecting device provided by the embodiment of the present invention.

detailed description

In view of the deficiencies in the prior art, the present invention provides a banknote detecting method and apparatus for obtaining a full-size image of a banknote to be tested by using transmitted light, and processing the collected full-size image; The security feature information is extracted from the processed full-size image; and the authenticity of the banknote is determined based on the processed image and/or the security feature information. This overcomes the limitations of reflective imaging algorithms. The banknote detection solution provided by the invention is easy to implement, has low realization cost, and the detection is fast and accurate, so that the counterfeit currency can be accurately detected, especially for the identification of the altered currency, and the effect is more obvious.

The invention provides a banknote detecting method, in which an image acquiring unit, a light source and a banknote passage are provided, wherein the image acquiring unit and the light source are respectively located on two sides of the banknote passage of the banknote identification device; The method includes:

S00, (this step is optional) before the banknote detection is performed, detecting that the banknote passes through the entrance of the banknote passage, issuing an indication signal to turn on the light source, and triggering the image acquisition unit;

S02, in the process that the banknote to be tested passes through the banknote passage, the light source illuminates the banknote to be tested, and the image obtaining unit uses the light source to transmit the full-size image of the banknote through the transmitted light of the banknote;

S04, processing the collected full-size image, and extracting the anti-counterfeiting feature information from the processed full-format image;

In the embodiment of the present invention, the anti-counterfeiting feature information may include at least one of the following information:

Watermarks, holographic magnetic security lines, offset positive back-to-print graphics, color-changing ink character shapes, invisible text textures, and crown numbers.

Processing the captured full-size image, including:

Perform affine transformation on the full-size image, normalize the image, perform Gaussian filtering, or perform image binarization on the full-size image, extract material information, specific area information, and perform counterfeit currency identification based on the extracted information.

The light source can emit light of a single wavelength, or light of different wavelengths can be emitted in a time-division manner as needed to illuminate the banknote to be tested.

When the banknotes are irradiated with light of different wavelengths, various anti-counterfeiting marks (graphics) or characteristic information can be displayed. For example, the infrared characteristic information cannot be reflected under ultraviolet or white light, and the corresponding anti-counterfeiting feature information cannot be obtained.

When the banknote is taken at a time, the light source emits a single wavelength of light to illuminate the banknote to be tested, forming a picture Like. Or alternately emitting light of different wavelengths to illuminate the banknote to be tested to form a plurality of images, and collecting images of each wavelength light when the banknotes to be tested pass through the banknote passage. Therefore, the banknotes need to form one or more images as needed through the collection device.

Then, the watermark, the holographic magnetic security thread, the offset positive complementary print pattern and the color changing ink character shape, the invisible text texture and the crown number are identified and judged from the processed image.

In the embodiment of the present invention, the image acquisition unit uses a contact image sensor CIS or a CMOS or CCD other image collection device.

Since the CIS is a line source illumination, it is convenient to obtain a full-size image with a CIS image, and has a high resolution. Therefore, CIS is usually used as an image acquisition unit to acquire an image.

S06: Determine the authenticity of the banknote according to the processed image and/or the security feature information.

Referring to Figure 2, a bill detecting device 200 provided by the present invention has an image acquiring unit 10, a light source 20, and a banknote passage 30;

The image acquisition unit 10 and the light source 20 are respectively located on both sides of the banknote passage of the banknote identification device. During the process of the banknotes to be tested passing through the banknote passage 30, the light source 20 illuminates the banknote to be tested, and the image acquisition unit 10 uses the light source to pass through. The transmitted light passing through the banknote collects an image of the anti-counterfeit mark on the banknote;

The apparatus 200 also includes:

The image processing unit 40 is configured to process the collected full-size image and extract the anti-counterfeiting feature information;

The determining unit 50 determines the authenticity of the banknote based on the processed image and/or the security feature information. The image acquisition unit 10 employs a contact image sensor CIS or a CMOS or CCD.

Since the CIS is a line source illumination, it is common to use CIS as an image acquisition unit to easily obtain a full-size image of the banknote.

The security feature information includes at least one of the following information:

Watermark, holographic magnetic security line, offset back and back to the printed graphic and crown number.

The light source can emit light of a single wavelength, or light of different wavelengths can be emitted in a time-division manner as needed to illuminate the banknote to be tested.照射 Illuminating banknotes with different wavelengths of light can reveal various anti-counterfeiting marks (graphics) or characteristic information. For example, infrared characteristic information can not be reflected under ultraviolet or white light, and the corresponding anti-counterfeiting feature information cannot be obtained.

When the banknote is taken at a time, the light source emits a single wavelength of light to illuminate the banknote to be tested, forming a picture Like. Or the light source alternately emits light of different wavelengths to illuminate the banknote to be tested, and collects images of each wavelength light when the banknotes to be tested pass through the banknote passage; for each wavelength of light, the image acquisition unit correspondingly collects An image is formed to form a plurality of images corresponding to different wavelengths. Therefore, the banknotes need to form one or more images as needed through the collection device.

In addition, a detecting unit (not shown) may be disposed at the entrance of the banknote passage for detecting the banknote entering the banknote passage; when detecting that the banknote passes through the entrance of the banknote channel, the detecting unit sends an indication signal to turn on the light source. And triggering the image acquisition unit to start collecting images on the banknotes.

In order to make the principles, features, and advantages of the present invention more apparent, the following description is described in conjunction with the specific embodiments.

Since the CIS image acquisition makes it easier to obtain a full-size image with a high resolution, the CIS is used as an image acquisition unit to acquire an image in the following embodiment.

Referring to FIG. 3, a schematic diagram of a CIS transmission mechanical structure implemented based on a transmission principle according to an embodiment of the present invention is shown. The image acquiring unit 310 and the light source 320 are respectively located at two sides of the banknote channel 330 of the banknote identification device;

After the system is started, the banknote passes through the banknote passage inlet 340, and a detecting unit (infrared pair tube, not shown) disposed near the banknote passage inlet 340 is triggered, and an indication signal is sent to turn on the light source 320, and the image is triggered. The unit CIS sensor 310 is acquired. When the banknote to be tested enters the channel between the CIS and the light source, the full image of the banknote is started. After the image collection is completed, the corresponding image recognition software algorithm is run to identify, and the banknote is stopped or the banknote is dispensed according to the recognition result, and the ticket is finally exported from the banknote outlet.

The banknote detecting method provided by the embodiment of the present invention, as shown in FIG. 4, includes the following steps:

S401, detecting that the banknote passes through the entrance of the banknote passage, turns on the light source, and triggers the image acquisition unit 10 to start collecting images on the banknote.

The light source can use a light source that emits a single wavelength, or a light source that emits light of different wavelengths (such as infrared light or violet light) in a time-sharing manner to illuminate the banknote to be tested in the banknote passage.

When the banknote is taken at a time, the light source emits a single wavelength of light to illuminate the banknote to be tested to form an image. Or alternately emitting light of different wavelengths to illuminate the banknotes to be tested, and in the process of the banknotes to be tested passing through the banknote passage, the image acquisition unit respectively collects images when the respective wavelengths of light are illuminated; for each wavelength of light, a corresponding one is formed. An image to form multiple images corresponding to different wavelengths. Therefore, the banknotes need to form one or more images as needed through the collection device.

Feature imaging with multiple light sources to address the imaging limitations of a single source. Due to security features It is reflected in multiple light sources. Therefore, a single light source must not display all the anti-counterfeit marks (graphics) or feature information. For example, the infrared characteristics are not reflected in the ultraviolet or white light, and the feature map cannot be obtained. Nothing to talk about. Before moving, by manually switching the currency type, each time the banknote identification is recognized, the preset algorithm module and single or multiple light sources are switched at the time of lighting, so that one banknote can form a single image or more. Fu image, then processed analysis. Therefore, the combination of different light source information can be utilized to the maximum extent, and feature recognition can be performed efficiently.

S402, in a process in which the banknote to be tested passes through the banknote passage, the light source illuminates the banknote to be tested, and the image acquisition unit uses the light source to transmit the full-width image of the banknote through the transmitted light of the banknote;

The CIS is used to capture the image of the banknote, and the CIS is illuminated by the line source, which enables easy full-size imaging of the banknote. Thanks to the transmitted light, the fluoroscopic pattern, anti-counterfeiting mark and feature information on the banknote can be obtained. Especially for some anti-counterfeiting labels that can only be obtained by transmission (such as offset back-to-back complementary printing). For the identification of the old coins of the renminbi, the recognition of the ancient coins image can not see the coincidence effect under the reflection. In principle, it cannot be recognized, but it is easy to collect the images formed by the overlap under transmission.

S404, processing the collected full-size image, and extracting the anti-counterfeiting feature information from the processed full-size image;

In the embodiment of the present invention, the anti-counterfeiting feature information may include a watermark, a holographic magnetic security thread, an offset back-printed graphic and crown number, a color-changing ink character shape, an invisible text texture, and the like.

Perform affine transformation on the full-size image, normalize the image, perform Gaussian filtering, or binarize the full-size image, and then detect the watermark, holographic magnetic security line, and offset printing from the processed image. The back complement recognizes and judges the printed graphic and the crown number.

S406. Determine the authenticity of the banknote according to the processed image and/or the security feature information.

For example, after obtaining the full-size image as shown in Fig. 5a, the main boundary is extracted by the edge, and it can be seen that the modified boundary has been basically detected. As shown in Figure 5b.

The information can be further extracted by morphological denoising to obtain an image as shown in Fig. 5c.

At this time, it is possible to determine whether or not there is such a type of alteration by projecting the X direction shown in Fig. 5c and setting an appropriate threshold. There are no obvious peaks in real money, and there are obvious peaks in the coin.

For example, after obtaining the full-size image as shown in Fig. 6a, the full-size image is subjected to binarization processing to obtain an image as shown in Fig. 6b.

The orientation of the image can be determined by locating the position of the image, and based on the relative position, an image of the watermark portion can be found, and the watermark edge map of the image shown in the figure is on the upper right side of the number. By extracting the boundary The relevant information can be judged whether the watermark information is normal, thereby judging whether it is a real coin or a counterfeit currency. The banknote detecting device 700 of the present embodiment, as shown in FIG. 7, includes an image acquiring unit 710, a light source 720, and a banknote passage 730;

The image processing unit 740 is configured to process the collected full-size image and extract the anti-counterfeiting feature information;

The determining unit 750 determines the authenticity of the banknote based on the processed image and/or the security feature information.

The detecting unit 760 is disposed at the entrance 740 of the walking channel for detecting the banknote entering the banknote passage; when detecting that the banknote passes through the banknote channel inlet 740, the detecting unit 760 issues an indication signal, turns on the light source, and triggers image acquisition. Unit 20 begins collecting images on the banknotes.

The image obtaining unit 710 and the light source 720 are respectively located on two sides of the banknote passage of the banknote identification device;

During the passage of the banknote to be tested through the banknote passage 730, the light source 720 illuminates the banknote to be tested, and the image acquisition unit 710 collects an image of the anti-counterfeit mark on the banknote by using the transmitted light of the banknote through the light source;

The banknote detecting device provided by the embodiment of the invention is further provided with a serial port or a USB interface, and is connected to the image processing unit or/and the determining unit for software debugging and upgrading of the image processing unit or the determining unit.

The image acquisition unit 710 uses a contact image sensor CIS or a CMOS or CCD.

Since CIS is a line source illumination, CIS is often used as an image acquisition unit to easily capture a full-size image of a banknote.

The anti-counterfeiting feature information includes: a watermark, a holographic magnetic security line, an offset back-printed complementary graphic and a crown number, a color-changing ink character shape, an invisible text texture, and the like.

The light source may be a light source that emits light of a single wavelength, or a light source that emits light of different wavelengths in a time-sharing manner may be used to illuminate the banknote to be tested. When the banknotes are illuminated by light of different wavelengths, various anti-counterfeiting marks (graphics) or feature information can be displayed. For example, the infrared characteristic information cannot be reflected under ultraviolet or white light, and the corresponding anti-counterfeiting feature information cannot be obtained.

When the banknote is taken at a time, the light source 720 emits a single wavelength of light to illuminate the banknote to be tested to form an image. Or the light source 720 alternately emits light of different wavelengths to illuminate the banknote to be tested, and during the process of passing the banknote to be tested, the image acquiring unit 710 separately collects images when each wavelength of light is irradiated; for each wavelength of light, correspondingly An image is formed to form a plurality of images corresponding to different wavelengths. Therefore The banknotes are formed into one or more images as needed by the collection device.

The working principle and the flow of the banknote detecting device provided in this embodiment are as described in the foregoing method embodiments, and are not described herein again.

In this embodiment, since the CIS is used to capture the image of the banknote, the CIS is illuminated by the line source, and the full-size image of the banknote can be conveniently realized. After obtaining a complete image of the banknote, a high-end algorithm based on image processing, pattern recognition, and computer vision is obtained. Processed in one. The detection algorithm module can be adapted to different materials, any spectral range and banknotes printed in any color.

Due to the mechanical vibration of equipment such as a money counter or a money detector, there is a slight difference (deviation) in the path of each banknote through the banknote. In this case, the image of the banknote will be rotated, deformed, etc., and can be effectively solved by subsequent processing such as affine transformation, rotation correction, size normalization, and brightness normalization.

In the embodiment of the present invention, the full-frame digital image processing has a detection point of up to 307,200 pixels in the case of a resolution of 640*480 pix, which is compared with the conventional detection of 4 or 5 points, that is, the traditional scheme of authenticating, the detection point The number is nearly 100,000 times the traditional. Through image processing, neighborhood correlation detection, feature extraction, morphological processing, neural network recognition, fuzzy clustering, target dynamic tracking and other algorithm modules, the implementation scheme provided by the present invention can accurately describe the real currency, and the counterfeit currency is changed. Coinage can be recognized stably. Moreover, each method used is a correlation calculation between data, which is an advanced method of advanced computer vision algorithms rather than single point detection.

Based on the full-scale detection scheme, the image is preprocessed by the algorithm before the recognition analysis is performed, and a certain error is allowed for the acquired image.

In this embodiment, the analysis of the two-dimensional image information can achieve the purpose of analyzing the feature by directly describing the characteristics of the real coin without establishing a real money database, and the detection speed and the number of coins of the algorithm module are not linear. relationship.

Under the situation that banknote fraud means are constantly being refurbished and changing more and more frequently, the testing equipment should be quickly adapted and updated in time to curb the circulation of counterfeit currency, which makes financial institutions and businesses take the initiative. The device provided by the invention can quickly upgrade the actual requirement of product authentication capability without changing the machinery and circuit of the equipment already existing in the market and actually used, and only needs to pass the serial port or USB for the detecting device in use. It's easy to upgrade.

Since the technical solution provided by the present invention performs detection and recognition on the transmission map, unlike the conventional reflection simulation human eye recognition process, the obtained image may be completely different from the image seen by the human eye, and the same security feature and the reflection image may be completely different. Therefore, the transmission map is not available. Counterfeit money manufacturing group can not know the anti-counterfeiting process and algorithm implementation, with natural system encryption function, counterfeit goods When the coin is manufactured, it does not know which feature point to imitate. Even if it knows all the mechanical structures and cracks all the hardware circuits, the anti-counterfeiting principle cannot be known, and the manufacturing difficulty of the counterfeit currency is greatly improved from the root cause. The metamorphosis of the altered currency is that the position is not fixed, the altered features are not fixed, and the size of the alteration is not fixed. Since the core feature of the altered currency is that there is a splicing process, some splicing features are not obvious under reflection, while the features are more obvious in the case of transmission. For the splicing of the carefully altered currency, it is difficult to see the anomaly from the surface (reflective). However, it is difficult to find a material that is consistent with the real coin in the material due to counterfeit currency, which results in a more obvious material variation in the splicing position in the transmission case. Although the reflective type is already concealed, the splicing is still obvious in transmission. By comparing the material's mutations, the image processing technology can easily identify the altered currency. Therefore, the detection of altered currency is based on the fact that transmission-based full-scale detection has a natural advantage over reflective imaging. The present invention has been disclosed in the above preferred embodiments, but it is not intended to limit the invention, and any one skilled in the art can make possible variations and modifications without departing from the spirit and scope of the invention. The scope of protection should be determined by the scope defined by the claims of the present invention.

Claims

Rights request

A method for detecting a banknote, wherein an image acquisition unit, a light source, and a banknote passage are disposed in the banknote identification device, wherein the image acquisition unit and the light source are respectively located at two sides of the banknote passage of the banknote identification device. The method includes:

The light source illuminates the banknote to be tested during the passage of the banknote to be tested, and the image acquisition unit collects the full-size image of the banknote by using the transmitted light of the banknote by the light source, and The collected full-size image is processed;

The method for detecting a banknote according to claim 1, wherein the processing the collected full-size image comprises:

The affine transformation is performed on the full-format image, and the image is normalized, and then subjected to filtering processing; or the image binarization processing is performed on the full-format image.

3. The method of detecting a banknote according to claim 1, wherein

The image acquisition unit uses a contact image sensor CIS or a CMOS or CCD.

4. The banknote detecting method according to claim 1, wherein the security feature information includes at least one of the following information:

Watermark, holographic magnetic security thread, offset positive back complementary graphic and color changing ink character shape, invisible text texture, crown number.

The method of detecting a banknote according to claim 1, wherein the collecting the full-size image of the banknote comprises:

The light source emits a single wavelength of light to illuminate the banknote to be tested, and an image is formed after each banknote passes through the path.

The method for detecting a banknote according to claim 1, wherein the light source emits light of different wavelengths to illuminate the banknote to be tested, and the full-size image of the banknote includes:

During the process of the banknotes to be tested passing through the banknote passage, images of the respective wavelengths of light are respectively collected; for each wavelength of light, an image is formed after each banknote passes through the banknote passage.

The method of detecting a banknote according to claim 1, further comprising: before performing the detecting of the banknote, further comprising:

Detecting that the banknote passes through the entrance of the wonderful channel, turning on the light source, and triggering the image acquisition unit The acquisition of images on the banknotes begins.

8. A banknote detecting device, comprising: an image acquiring unit, a light source, and a banknote passage, wherein the image acquiring unit and the light source are respectively located on two sides of the banknote identification device; During the channel, the light source illuminates the banknote to be tested, and the image acquiring unit uses the transmitted light of the light source to collect an image of the anti-counterfeit mark on the banknote;

The device also includes:

And an image processing unit, configured to process the collected full-size image and extract the anti-counterfeit feature information; and the determining unit determines the authenticity of the banknote according to the processed image and/or the anti-counterfeiting feature information.

9. The banknote detecting device according to claim 8, wherein

The image acquisition unit uses a contact image sensor CIS or a CMOS or CCD.

The banknote detecting device according to claim 8, wherein the security feature information includes at least one of the following information:

Watermark, holographic magnetic security thread, offset positive back-printed graphic, color-changing ink character shape, invisible text texture and crown number.

11. The banknote detecting device according to claim 8, wherein

The light source emits a single wavelength of light to illuminate the banknote to be tested, and after each banknote passes through the path, the image acquisition unit collects and forms an image;

The light source emits light of different wavelengths in a time-sharing manner to illuminate the banknote to be tested. During the process of the banknotes to be tested passing through the banknote passage, the image acquisition unit respectively collects images when the respective wavelengths of light are illuminated; Thereafter, for each wavelength of light, an image is acquired accordingly.

12. The banknote detecting device according to claim 8, further comprising:

The detecting unit is disposed at the entrance of the banknote passage for detecting the banknote entering the banknote passage; when detecting that the banknote passes through the entrance of the banknote passage, the detecting unit sends an indication signal, turns on the light source, and triggers the image acquisition unit to start 釆An image on the banknote is collected.

13. The banknote detecting device according to claim 8, further comprising: