WO2012016484A1 - 有价文件识别方法及其识别系统、装置 - Google Patents
有价文件识别方法及其识别系统、装置 Download PDFInfo
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- WO2012016484A1 WO2012016484A1 PCT/CN2011/076550 CN2011076550W WO2012016484A1 WO 2012016484 A1 WO2012016484 A1 WO 2012016484A1 CN 2011076550 W CN2011076550 W CN 2011076550W WO 2012016484 A1 WO2012016484 A1 WO 2012016484A1
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- Prior art keywords
- image
- banknote
- value document
- feature
- module
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/19—Recognition using electronic means
- G06V30/191—Design or setup of recognition systems or techniques; Extraction of features in feature space; Clustering techniques; Blind source separation
- G06V30/19173—Classification techniques
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/24—Classification techniques
- G06F18/241—Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches
- G06F18/2413—Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches based on distances to training or reference patterns
- G06F18/24133—Distances to prototypes
- G06F18/24137—Distances to cluster centroïds
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/143—Sensing or illuminating at different wavelengths
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/25—Determination of region of interest [ROI] or a volume of interest [VOI]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/30—Noise filtering
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/44—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/40—Document-oriented image-based pattern recognition
- G06V30/41—Analysis of document content
- G06V30/418—Document matching, e.g. of document images
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/20—Testing patterns thereon
- G07D7/2008—Testing patterns thereon using pre-processing, e.g. de-blurring, averaging, normalisation or rotation
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/20—Testing patterns thereon
- G07D7/202—Testing patterns thereon using pattern matching
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/20—Testing patterns thereon
- G07D7/202—Testing patterns thereon using pattern matching
- G07D7/206—Matching template patterns
Definitions
- the present invention relates to image processing and pattern recognition techniques, and more particularly to value documents, such as banknote identification methods, and identification systems and apparatus therefor.
- Image restoration technology based on partial differential equations has achieved certain research results. It can deal with the phenomenon of scratches, handwriting, stains, wrinkles, etc., and can achieve better recovery effect. The recovery of old banknote images and partial differential equations. The research content of image restoration is consistent. Image restoration technology based on partial differential equations is applied to banknote image recovery, which can achieve better recovery results.
- Fig. 1 is a flow chart of the conventional banknote image recognition processing. As shown in the figure, the image is restored to the entire image, and the features are extracted, and then classified according to the currency, denomination or new and old standards, and finally the authentication is recognized.
- T denote the time of each banknote identification
- ⁇ Represents the time overhead of image processing
- ⁇ represents the time overhead of feature extraction
- ⁇ represents the time overhead of the classification
- ⁇ represents the time overhead of the authentication
- the existing banknote recognition system does not process the old banknotes, that is, refuses to identify the old banknotes, thereby causing a large number of old banknotes to be rejected, and the banknote identification system has a high rate of banknote rejection, which affects the banknote identification system. Ease of use is not conducive to the promotion and application of financial self-service devices.
- An object of the present invention is to provide a value document identification method with a fast real-time response speed, and a value document recognition system and apparatus having a fast real-time response speed and a low banknote rejection rate.
- the method of identifying valuable documents includes:
- Step 1 extracting features, selecting a feature area of the value document, and extracting a value document feature for quick classification from the feature area;
- Step 2 Quickly classify, according to the value document feature extracted in step 1, the classified value file is quickly sorted according to a preset classification model, and the currency, denomination, orientation, and image quality information of the value document are obtained. Information, and select banknotes with good image quality, one banknote and one banknote with poor image quality - old banknotes;
- Step 3 image restoration, applying image restoration technology based on partial differential equation to recover the old banknote image, and obtaining the restored image;
- Step 4 Anti-counterfeiting processing, directly identifying the new banknotes; authenticating the old banknotes through the restored images to determine the authenticity of the current banknotes;
- Step 5 Output the result of determining the current banknote.
- the extracting feature in step 1 is to combine the multi-wavelength image characteristics of the banknote, the multi-resolution characteristic of the banknote image, and the anti-counterfeiting property of the banknote image, select the feature region of the multi-wavelength image of the banknote, and combine the classification model to select from Features are extracted from the feature area.
- the value document feature in the step 1 includes at least one of a white watermark, a black watermark, a color changing ink, a magnetic security thread, a microtext, a gravure printing pattern, a denomination digital number, and a banknote crown number.
- the vectorization of the feature of the value document in the step 1 includes: normalizing the image of the feature area of the value document to obtain a normalized image; and selecting "the normalized image" Different feature regions are respectively subjected to gray value average calculation for 1 to n feature region images; feature vectors are formed according to the above 1 to n gray scale average values.
- the quick classification model is established according to different currencies, denominations, orientations, and image quality.
- the fast classification model includes the following levels:
- the first layer different currencies, such as: RMB, Euro, US dollar;
- Second level different denominations in the same currency
- Third layer different orientations of the same denomination
- Fourth layer Different image quality of the same denomination, including new and old notes.
- classification model may be in the following hierarchical order:
- the first layer different currencies, such as: RMB, Euro, US dollar;
- Second level different denominations in the same currency
- the third layer different image quality of the same denomination, including new and old notes;
- the fourth layer different orientations of the same denomination.
- the classification model is established by the following steps: dividing p currencies, q class denominations of each currency, front and back 2 faces of each denomination, and feature regions of new and old images; respectively, forming the previous step ⁇ ⁇ ⁇ 4 different images are normalized to obtain a normalized image; from each normalized image, "a different feature region is selected, and for each of the 1 to n feature region images, the gray value average calculation is performed, Forming feature vectors; training the feature vectors by R training samples to form 4 cluster centers of pxgx, and then establishing a classification model of the feature areas of the value documents.
- the rapid classification process includes the following steps: For extracted features, the distance from the cluster center of each category is:
- the input D when [0.1-0.5], the input D can be classified into classes; otherwise, the input D does not belong to the category.
- step 3 the image is restored, and the restored object is a region of interest (R0I) of the banknotes with poor image quality.
- the restoration of the old banknote image is performed using an image restoration method based on a partial differential equation.
- the value document identification system provided by the invention comprises:
- An image acquisition module configured to collect image data of a value document
- a storage module configured to store the foregoing image data and required standard model data
- a data processing module performs feature region feature extraction, fast classification, and image restoration processing on the stored image data; that is, selecting a feature region of the value document, and extracting features of the value document from the feature region; Describe the characteristics of the value document, perform rapid classification processing on the input value document according to the pre-set classification model, select banknotes with good image quality and banknotes with poor image quality; and recover the image of the banknote with poor image quality, Obtaining the restored image (ie, image data);
- An identification module configured to compare the processed image data with the standard model data, and perform an authentication process
- An output module configured to output an identification result of the identification module
- a central control module for controlling and coordinating work between the above modules (ie, image acquisition module, storage module, data processing module, identification module, and output module), including data transmission, resource allocation, and the like.
- a data link is formed between each module in the value document identification system, wherein the data link belongs to the public Known technology, the present invention will not be described again.
- the invention provides a value document identification device, comprising:
- a selection module for selecting a feature area of the value document
- An extraction module configured to extract a feature of the value document from the feature area
- a classification processing module configured to perform fast classification processing on the input value document according to the extracted classification document according to a preset classification model, and select a banknote with good image quality and a banknote with poor image quality;
- the identification module is configured to perform the forensic identification of the banknotes with good image quality obtained by the classification processing module; and perform the forgery identification of the image recovered by the recovery processing module to determine the authenticity of the current banknote;
- An output module configured to output a result of the identification module determining the current banknote.
- the beneficial effects of the value document identification method, device and system are: omitting the image restoration processing of the banknotes with good image quality, saving time, improving the processing efficiency of the whole system; and having poor image quality Banknotes - the area of interest (ROI) of the old banknotes is restored, which not only saves system overhead, but also provides good quality image data for the authentication process, reduces the difficulty of authenticity, and improves the accuracy of the authentication, thereby improving the banknote identification system. Receive rate.
- ROI area of interest
- FIG. 1 is a flow chart of a conventional banknote image recognition processing method
- FIG. 2 is a flow chart of a method for identifying a value document provided by an embodiment of the present invention
- FIG. 3 is a schematic diagram of establishing a rapid classification model in FIG. 2;
- Figure 4 is another schematic diagram of establishing a quick classification in Figure 2;
- Figure 5 is a schematic diagram of image recovery in Figure 2;
- FIG. 6 is a schematic structural diagram of a value document identification system according to an embodiment of the present invention.
- the value document identification method includes: Step 1: extracting features; Step 2, fast classification; Step 3, image restoration; Step 4, authentication identification; and Step 5, outputting the result.
- Step 1 extracting features
- Step 2, fast classification fast classification
- Step 3, image restoration image restoration
- Step 4, authentication identification authentication identification
- Step 5 outputting the result.
- the details of each step are detailed below.
- Step 1 Extract features.
- the feature area of the multi-wavelength image of the banknote is selected, and the feature is extracted from the selected feature area in combination with the classification model, such as: , black watermarks, color-changing inks, magnetic security lines, micro-text, gravure prints, denomination digit numbers, and/or banknote crown numbers.
- the classification model such as: , black watermarks, color-changing inks, magnetic security lines, micro-text, gravure prints, denomination digit numbers, and/or banknote crown numbers.
- the feature area image is normalized to obtain a normalized image:
- Step 2 Quickly categorize.
- the input banknote information is quickly sorted according to a predetermined classification model to obtain the currency, denomination, orientation, and image quality of the banknote.
- the currency, denomination, and orientation image quality provide guidelines for subsequent ring-orientation interest (ROI) regions.
- ROI ring-orientation interest
- the image quality determines whether image restoration processing is required, and the banknotes with good image quality are directly sent to the recognition. Processing, old banknotes with poor image quality are processed by the data processing module.
- First, the classification model is established according to different currencies, denominations and image quality in the following levels: First layer: According to different currencies, such as: RMB, Euro, US dollar, the banknotes are classified; Second layer: According to the same currency Different denominations, such as: RMB 100, 50 yuan, further classification of banknotes;
- the third layer according to the different orientation of the same denomination, such as: forward, reverse, the third level of the banknote classification; then
- the fourth layer According to different image quality of the same denomination, such as: new banknotes, old banknotes, classify the banknotes again.
- the third layer and the fourth layer can be interchanged, as shown in Figure 4.
- the first layer according to different currencies, such as: RMB, Euro, US dollar, classify banknotes;
- Second layer According to the same currency Different denominations, such as: RMB 100, 50 yuan, the second level of banknote classification;
- Third layer According to different image quality of the same denomination, such as new banknotes, old banknotes, classify banknotes again;
- Fourth layer Last According to the different orientation of the same denomination, such as: forward, reverse, re-classify the banknotes.
- the classification discriminant function is defined as:
- the input D can be classified as ⁇ class; otherwise, the input D does not belong to the category.
- Image restoration for the localized interest (ROI) region of the old banknote that is, combining the information obtained by the fast classification process, first positioning the image's localized interest (ROI) region, and using the partial differential equation based image restoration technique to locate the interested In the (ROI) area image, the image of the location of interest (ROI) area is restored.
- the specific implementation process is shown in Figure 5. After the image of the location of interest (ROI) region is restored, the image quality requirements for authentication are achieved.
- the goal of image restoration is to recover the original image from a degraded image (noise, blur, and stain). While removing noise and blur, the boundary and detail information of the image can be preserved.
- the recovery model needs to satisfy: (a) It should have an isotropic diffusion effect in a region with a small gradient, and (b) Only evolve along a gradient direction in a region with a large gradient value.
- the embodiment adopts an image restoration model based on partial differential equations as follows:
- Q e R is a bounded open set; for variable parameters, V is a gradient operator; ⁇ ( ⁇ ) is a monotonically decreasing function; it is a non-local averaging filter.
- ⁇ ( ⁇ ) uses the boundary function in the anisotropic diffusion model, as shown in the following equation.
- ⁇ is the boundary threshold parameter
- Step 4 Identification identification.
- banknote information entering this link is divided into two types: banknotes of poor quality that have been processed by the image recovery, old banknotes of the quality, and banknotes of good quality that have not been image-recovered.
- the banknote information is matched to determine the authenticity of the current banknote.
- Step 5 output the result.
- the above-mentioned method for identifying valuable documents using banknote identification as an example because the method first classifies the value documents, and then performs image restoration processing only on the old coins with poor image quality according to the classification result, thereby saving a large amount of image restoration processing time. Improves the real-time response speed of the banknote recognition system.
- the system for realizing the value document identification method has a module architecture as shown in FIG. 6, and includes: an image acquisition module, configured to collect image data of the value document;
- a storage module configured to store the foregoing image data and required standard model data
- a data processing module performs feature region feature extraction, fast classification, and image restoration processing on the stored image data; that is, selecting a feature region of the value document, and extracting features of the value document from the feature region; Describe the characteristics of the value document, perform rapid classification processing on the input value document according to the pre-set classification model, select banknotes with good image quality and banknotes with poor image quality; and recover the image of banknotes with poor image quality, Obtaining the restored image;
- An identification module configured to perform pseudo-identification processing on the processed image data
- An output module configured to output an authentication result of the identification module
- a central control module for controlling and coordinating the work of the above modules, including data transmission, resource allocation, and the like.
- a data link is formed between the modules, and the data link is a well-known technology, and the present invention will not be described again.
- the implementation process of the functions and functions of the modules in the system refer to the corresponding implementation process in the above method, and details are not described herein.
- the present invention further provides a value document identification device, including: a selection module, an extraction module, a classification processing module, a recovery processing module, an identification module, and an output module, wherein the selection module is used for Selecting a feature area of the value document; the extracting module is configured to extract a feature of the value document from the feature area; the classification processing module is configured to input the image according to the extracted feature of the value document The value document is quickly classified according to a pre-set classification model, and the banknote with good image quality and the banknote with poor image quality are selected; the recovery processing module recovers the image of the banknote with poor image quality, and the processed image is processed.
- a value document identification device including: a selection module, an extraction module, a classification processing module, a recovery processing module, an identification module, and an output module, wherein the selection module is used for Selecting a feature area of the value document; the extracting module is configured to extract a feature of the value document from the feature area; the classification processing module is configured to input the image according to the extracted
- the identification module is configured to perform the forensic identification of the banknotes with good image quality obtained by the classification processing module, and to perform false identification on the image recovered by the recovery processing module to determine the authenticity of the current banknote;
- An output module configured to output a result of the identification module determining the current banknote.
- the value file identification device may be integrated in the service terminal, or may be deployed independently. This embodiment is not limited.
- the implementation process of the functions and functions of the modules in the device refer to the corresponding implementation process in the foregoing method, and details are not described herein again.
- the system Since the system only performs image (ROI) region image restoration processing on the old banknote with poor image quality, and directly authenticates the new banknote with good image quality, it saves a lot of recognition processing time, so the real-time response speed is fast. It is suitable for financial self-service equipment, its low banknote rejection rate and easy to use, which is conducive to the promotion and use of financial self-service equipment.
- ROI image
- the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
- the technical solution of the present invention may be embodied in the form of a software product in essence or in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. , an optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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AU2011288069A AU2011288069B2 (en) | 2010-08-03 | 2011-06-29 | Valuable file identification method and identification system, device thereof |
US13/810,422 US9262677B2 (en) | 2010-08-03 | 2011-06-29 | Valuable file identification method and identification system, device thereof |
EP11814067.2A EP2602771A4 (en) | 2010-08-03 | 2011-06-29 | IDENTIFICATION METHOD AND VALUE DOCUMENT IDENTIFICATION SYSTEM AND CORRESPONDING DEVICE |
Applications Claiming Priority (2)
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CN2010102514730A CN101908241B (zh) | 2010-08-03 | 2010-08-03 | 有价文件识别方法及其识别系统 |
CN201010251473.0 | 2010-08-03 |
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WO2012016484A1 true WO2012016484A1 (zh) | 2012-02-09 |
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PCT/CN2011/076550 WO2012016484A1 (zh) | 2010-08-03 | 2011-06-29 | 有价文件识别方法及其识别系统、装置 |
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US (1) | US9262677B2 (zh) |
EP (1) | EP2602771A4 (zh) |
CN (1) | CN101908241B (zh) |
AU (1) | AU2011288069B2 (zh) |
WO (1) | WO2012016484A1 (zh) |
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US20130121539A1 (en) | 2013-05-16 |
EP2602771A4 (en) | 2014-05-07 |
US9262677B2 (en) | 2016-02-16 |
AU2011288069A1 (en) | 2013-01-31 |
CN101908241B (zh) | 2012-05-16 |
AU2011288069A9 (en) | 2013-11-07 |
EP2602771A1 (en) | 2013-06-12 |
AU2011288069B2 (en) | 2014-02-13 |
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