Road networking toll collection electronic evidence storage system

Abstract

The invention relates to the field of road networking toll collection, and discloses a road networking toll collection electronic evidence storage system, which comprises a block chain electronic evidence storage platform, and the block chain electronic evidence storage platform comprises an access calculation module used for receiving vehicle passing electronic data collected in real time from the edge side of a toll road; the verification processing module is used for verifying the signature legality of the electronic data submitted by the edge side and executing the intelligent contract to process the electronic data; and the dynamic encryption module is used for generating an encryption key from the processed electronic data by taking the electronic data transaction sequence number and the road section public key coordinate as factors by adopting a dynamic password encryption mechanism. A block chain node is deployed at a coherent party to establish an electronic evidence storage platform, vehicle passing electronic data are collected and processed in real time, a dynamic password encryption mechanism is adopted, secret key encryption data are calculated according to a transaction sequence number and road section public key coordinates, the data are verified, an intelligent contract is executed, and the data are stored as non-tampering blocks.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of highway network toll collection, in particular to an electronic evidence storage system for highway network toll collection. BACKGROUND

[0002] When a vehicle passes through a toll highway, the highway network toll collection system collects data such as vehicle passing time, location, license plate, vehicle type, transaction log, and captures high-definition pictures and passing videos of the vehicle, and saves these data as vehicle passing evidence in the database of the toll collection system.

[0003] In terms of finding and collecting evidence of vehicles that evade tolls, toll highway management units use many intelligent technologies such as big data, artificial intelligence, edge computing, and multi-stream path fusion to build a highway business audit model library, thereby improving the efficiency and accuracy of audits. However, in terms of evidence chain management, the original means of manually retrieving vehicle passing pictures and videos are still used. When a toll highway management unit conducts judicial recovery of vehicles that evade tolls, it needs to provide the above passing evidence to the judicial department. The current technical means is to manually search for vehicle passing evidence from the database of the toll collection system, package and download it, and save it to a CD or other storage medium, resulting in low efficiency in collecting and organizing evidence. SUMMARY

[0004] To make up for the above shortcomings, the present application provides an electronic evidence storage system for highway network toll collection, aiming to improve the low efficiency of collecting and organizing evidence in the traditional highway network toll collection in terms of evidence chain management.

[0005] In a first aspect, the present application provides the following technical solution: an electronic evidence storage system for highway network toll collection, comprising a blockchain electronic evidence storage platform, characterized in that the blockchain electronic evidence storage platform comprises: an access computing module for receiving vehicle passing electronic data collected in real time from the edge side of the toll highway; a verification processing module for verifying the signature legality of the vehicle passing electronic data, executing an intelligent contract to process the vehicle passing electronic data, and obtaining processed data; a dynamic encryption module for using a dynamic password encryption mechanism to generate an encryption key using the vehicle passing electronic data transaction serial number and the road segment public key coordinates as factors, and obtaining encrypted data; a blockchain evidence storage module for packaging the encrypted data into blocks according to the block structure of the blockchain, broadcasting to all nodes for consensus, forming unalterable block data after successful consensus, and storing in each node to form evidence storage information; an evidence generation module for generating a vehicle passing evidence chain and a notary evidence report according to a preset rule using the evidence storage information and the vehicle passing electronic data according to the query demand.

[0006] Preferably, the edge side of the toll road includes a toll station and an ETC gantries, and the electronic data of vehicle passage includes transaction flow, license plate number, vehicle model, passage time, passage route, high-definition pictures, and passage videos.

[0007] Preferably, the electronic data on vehicle traffic collected in real time at the edge of the toll road is processed by a blockchain client application deployed at the edge of the toll road and submitted to the access calculation module in real time. The processing includes performing summary calculation on the collected electronic data on vehicle traffic, adding a timestamp and performing a digital signature.

[0008] Preferably, the verification adopts a digital signature verification algorithm, the smart contract includes electronic data format verification, billing rule matching, and data integrity check, all the nodes include ETC provincial centers, ETC issuers, toll road management units, judicial appraisal agencies, and notary offices, and each node communicates with each other through a dedicated fiber optic line and a configured network.

[0009] Preferably, the dynamic password encryption mechanism generates a 64-bit batch factor from the transaction serial number of the electronic data. , combined with industry key management units , toll road management unit identification code , Industry key management unit public key coordinates ( , ) Perform SM3 summary calculation to obtain the summary value , and then For key pairs Do SM4 decryption and encryption respectively 、 , and the coordinates of the toll road management unit The coordinates are obtained after dot multiplication 、 ,according to and Calculate the encryption key of length 32 ;and ; ;in is the preset symmetric key, ( , ) is a point The coordinates of for point The coordinates of A preset constant.

[0010] Preferably, the industry key management unit fills encryption keys and digital certificates for each toll road management unit through the key management module.

[0011] Preferably, the preset rule comprises associating the multi-dimensional data in chronological order, embedding the blockchain storage hash value and consensus information, the vehicle pass evidence chain comprises multi-dimensional data, blockchain storage hash value, consensus time, node signature, and the multi-dimensional data comprises transaction flow, picture and video.

[0012] In a second aspect, the present application provides the following technical solution, a highway network toll electronic storage method, comprising the following steps: S1, access calculation: receiving vehicle pass electronic data collected in real time from the edge side of the toll road; S2, verification processing: verifying the signature legality of the vehicle pass electronic data, executing the smart contract to process the vehicle pass electronic data to obtain processing data; S3, dynamic encryption: using a dynamic password encryption mechanism, generating an encryption key by taking the vehicle pass electronic data transaction serial number and the road segment public key coordinate as factors, and obtaining encrypted data; S4, blockchain storage: packing the encrypted data into a block according to the block structure of the blockchain, broadcasting to all nodes for consensus, forming tamper-proof block data after successful consensus, and storing in each node to form storage information; S5, generate the certificate: according to the query demand, using the storage information and the vehicle pass electronic data, generating the vehicle pass evidence chain and the evidence report of the notary office according to the preset rule.

[0013] In a third aspect, the present application provides the following technical solution, a computer device, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to realize the highway network toll electronic storage method as described above.

[0014] In a fourth aspect, the present application provides the following technical solution, a readable storage medium, wherein the readable storage medium stores a computer program, and the computer program is executed by a processor to realize the highway network toll electronic storage method as described above.

[0015] The present application provides a highway network toll electronic storage system. It has the following advantages: 1. The present application builds an electronic storage platform by deploying blockchain nodes in the coherent square part, collects and processes vehicle pass electronic data in real time, uses a dynamic password encryption mechanism to calculate a key to encrypt data by transaction serial number and road segment public key coordinate, verifies data, executes a smart contract, stores data as tamper-proof blocks, completes automatic storage, generates an evidence chain and issues a notarization report according to the storage and original data when there is a fee evasion case, improves evidence collection and arrangement efficiency, reduces auditing cost, and improves the problem of low evidence collection and arrangement efficiency in the evidence chain management of traditional highway network tolling.

[0016] 2、The present application adopts a dynamic password encryption mechanism, the dynamic encryption unit encrypts the electronic data submitted each time with different keys, and each decryption key can only decrypt the electronic data of the current section, at the same time, the signature processing unit signs the encrypted data, and binds the certificate and unit number with one key, ensuring the security and privacy of electronic data in the transmission and storage process, preventing data from being illegally obtained, tampered or forged, ensuring the authenticity and reliability of the evidence, and providing a solid foundation for subsequent judicial use.

[0017] 3、The present application reaches an agreement on data between nodes through a consensus mechanism, packs the electronic data into blocks and broadcasts them to all nodes for consensus, ensures that all nodes store the same tamper-proof block data, enhances the consistency and credibility of the data, and enables different participants to process business and make decisions based on the same data, improving the operation efficiency and transparency of the entire highway toll collection system.

[0018] 4、The present application uses the decentralized characteristics of the blockchain technology, has no single control point, and can increase or decrease the nodes of the toll road management unit at any time, and has good scalability.

[0019] 5、The present application directly completes the electronic data evidence storage service through distributed blockchain node consensus, can effectively reduce the evidence storage time cost and electronic evidence identification cost, and the blockchain electronic evidence storage platform can be connected to the judicial system, and the electronic evidence can be directly pushed to the judicial business system, which can effectively improve the cross-industry cooperation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The system architecture diagram of the highway toll collection electronic evidence storage system proposed by the present application; Figure 2 The generation process diagram of the dynamic password generation algorithm rule proposed by the present application; Figure 3 The principle block diagram of the highway toll collection electronic evidence storage system proposed by the present application; Figure 4 The method flow chart of the highway toll collection electronic evidence storage method proposed by the present application. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be described clearly and completely in combination with the drawings of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] Embodiment one Reference Figures 1-3 In the first embodiment of the present application, the present application provides a highway network toll electronic evidence system, including a blockchain electronic evidence platform, the blockchain electronic evidence platform comprising: An access computing module: for receiving vehicle passing electronic data collected in real time from the edge side of the toll road; the edge side of the toll road includes toll stations and ETC gantries, and the electronic data includes transaction water, license plate number, vehicle type, passing time, passing route, high-definition picture, and passing video. The vehicle passing electronic data collected in real time from the edge side of the toll road is processed by the blockchain client application deployed on the edge side of the toll road, and is submitted to the access computing module in real time, the processing including abstract calculation on the collected vehicle passing electronic data, superposition of time stamp and digital signature Specifically, a plurality of coherent parties deploy blockchain nodes, and the nodes are interconnected through fiber optic private lines and configuration networks, building a blockchain electronic evidence platform, which provides a distributed and decentralized environment for the storage and verification of electronic data, ensures that data can be reliably stored and reach consensus among all parties, lays a foundation for subsequent evidence collection and sorting, and provides high-precision sensors and data collection equipment through toll stations and ETC gantries on the edge side of the toll road as the front line of data collection. The toll station uses a lane system to quickly collect transaction water information, including toll amount and toll time, when a vehicle passes; at the same time, a license plate recognition device accurately obtains a license plate number, a vehicle type detection device determines a vehicle type, and an ETC gantry collects passing time and passing route information of a vehicle in real time through microwave communication technology, and captures high-definition pictures and passing videos of the vehicle with the help of a high-definition camera. The collected electronic data is transmitted to the blockchain client application deployed on the edge side, and the blockchain client application uses an efficient abstract algorithm, such as SHA-256 algorithm, to abstractly calculate the collected electronic data, and converts the huge data into a unique abstract value of fixed length. Then, a precise UTC time stamp is obtained and superimposed on the data to determine the time when the data is generated. Subsequently, the private key of the edge side device is used to digitally sign the data and the abstract value to ensure the integrity and non-repudiation of the data. The processed data is transmitted in real time to the access computing module through an encrypted network channel, such as a secure channel based on SSL / TLS protocol.

[0023] A verification processing module: for verifying the signature legality of the vehicle passing electronic data, executing an intelligent contract to process the vehicle passing electronic data, and obtaining processed data; verification is performed using a digital signature verification algorithm, and the intelligent contract includes electronic data format verification, billing rule matching, and data integrity checking. All nodes include an ETC provincial center, an ETC issuer, a toll road management unit, a judicial authentication agency, and a notary office, and each node is interconnected with each other through fiber optic private lines and configuration networks.

[0024] Specifically, when the access calculation module receives the data, the verification processing module will use the digital signature verification algorithm, which is based on the public key encryption system and uses the public key corresponding to the edge device to verify the digital signature. By comparing the signature information and the recalculated data summary value, it is determined whether the data has been tampered with during the transmission process. If the signature verification is successful, the smart contract starts running. It is a pre-written, automatically executed program code deployed on each node of the blockchain. Among them, the electronic data format verification part will check the field integrity of the transaction flow and the correctness of the format of the license plate number according to the preset strict format specifications; the billing rule matching module will carefully check the accuracy of the charge amount based on the vehicle model, route and relevant charging policies; the data integrity check function recalculates the hash value of the data and compares it with the previously stored hash value to ensure that the data is not lost or damaged during transmission and storage. All participating nodes, namely the ETC provincial center, ETC issuer, toll road management unit, judicial appraisal agency, and notary office, are connected through high-speed and stable fiber-optic dedicated lines and perform precise network configuration to achieve intercommunication between each other, building a reliable distributed network environment to ensure the synchronous execution and verification of smart contracts on each node.

[0025] Dynamic encryption module: It is used to use dynamic password encryption mechanism to generate encryption key with vehicle pass electronic data transaction serial number and road section public key coordinates as factors to obtain encrypted data; dynamic password encryption mechanism generates a 64-bit batch factor for the electronic data transaction serial number , combined with industry key management units , toll road management unit identification code , Industry key management unit public key coordinates ( , ) Perform SM3 summary calculation to obtain the summary value , and then For key pairs Do SM4 decryption and encryption respectively 、 , and the coordinates of the toll road management unit The coordinates are obtained after dot multiplication 、 ,according to and Calculate the encryption key of length 32 ;and ; ;in is the preset symmetric key, ( , ) is a point The coordinates of for point coordinates of the industry key management unit, The industry key management unit fills the encryption key and the digital certificate for each toll road management unit through the key management module.

[0026] Specifically, by converting the transaction serial number of the electronic data into a batch factor of 64 bits, this factor serves as the basis for subsequent encryption calculation. Then, by combining the identification of the industry key management unit, the toll road management unit identification code, and the public key coordinates of the industry key management unit, the SM3 digest algorithm is used for calculation to obtain the digest value. Next, based on the preset symmetric key, the digest value is subjected to SM4 decryption and encryption operations respectively to obtain an intermediate value. Then, the intermediate value is subjected to point multiplication operation with the coordinates of the toll road management unit to obtain a new coordinate value. Finally, according to the calculation formula, the encryption key with a length of 32 is calculated from these coordinate values. The industry key management unit fills the unique encryption key and digital certificate for each toll road management unit through the special key management module, and tightly binds the encryption key with the identification code of the unit, thereby fundamentally eliminating the risk of key confusion and illegal use.

[0027] The blockchain storage module is used to package the encrypted data into blocks according to the block structure of the blockchain, broadcast to all nodes for consensus, form unalterable block data after successful consensus, and store in each node to form the storage information.

[0028] Specifically, the electronic data encrypted by the dynamic encryption module is packaged according to the designed block structure of the blockchain, and each block contains the hash value of the previous block. This hash value is like a link on a chain, tightly connecting each block. Any slight change in a block will cause the hash value of all subsequent blocks to change, thereby ensuring the data unalterability. At the same time, the block also contains the current encrypted electronic data and the precise timestamp. The packaged block is sent to all nodes through broadcasting, and the PBFT (practical Byzantine fault tolerance) consensus algorithm is used. When more than 2 / 3 of the nodes are working normally, each node will strictly verify the received block, including whether the format of the block is correct, the data is complete, and the hash value is matched, etc. Only when more than 2 / 3 of the nodes are verified, the block will be considered valid and stored in the blockchain ledger of each node, forming unalterable storage information.

[0029] The evidence generation module is configured to generate vehicle pass evidence chain and notary evidence report according to the query requirement, using the stored evidence information and vehicle pass electronic data, and according to preset rules. The preset rules include associating multi-dimensional data in time sequence, embedding blockchain stored evidence hash value and consensus information. The vehicle pass evidence chain includes multi-dimensional data, blockchain stored evidence hash value, consensus time and node signature. The multi-dimensional data includes transaction serial number, picture and video.

[0030] Specifically, when receiving the query requirement from the toll road management unit or other related parties, the corresponding vehicle pass original electronic data is extracted from the stored evidence information stored in the blockchain storage module. According to the preset rules, the vehicle pass evidence chain is generated, including accurately associating multi-dimensional data in time sequence, such as arranging the transaction serial number, picture and video in the order of vehicle pass time sequence, clearly showing the pass process of the vehicle. At the same time, the blockchain stored evidence hash value and consensus information are embedded, which can prove the authenticity and non-tamperability of the data. The generated vehicle pass evidence chain contains multi-dimensional data, blockchain stored evidence hash value, consensus time and signature of each node. Finally, the evidence generation module will call the interface of a professional notary office to generate an evidence report in accordance with the evidence chain, which meets the requirements of the Electronic Signature Law, ensuring that the report has validity and authority at the legal level.

[0031] Embodiment two Reference Figure 4 In the second embodiment of the present application, the present application provides a method for electronic storage of highway network toll, comprising the following steps: S1, access calculation: receiving vehicle pass electronic data collected in real time from the edge side of the toll road; S2, verification processing: verifying the signature legality of the vehicle pass electronic data, executing the smart contract to process the vehicle pass electronic data, and obtaining processing data; S3, dynamic encryption: using a dynamic password encryption mechanism, generating an encryption key by taking the vehicle pass electronic data transaction serial number and road segment public key coordinates as factors, and obtaining encrypted data; S4, blockchain storage: packaging the encrypted data into blocks according to the block structure of the blockchain, broadcasting to all nodes for consensus, forming non-tamperable block data after successful consensus, and storing in each node to form stored evidence information; S5, generate evidence: according to the query requirement, using the stored evidence information and vehicle pass electronic data, and according to the preset rules, generating vehicle pass evidence chain and notary evidence report.

[0032] Specifically, the toll station and the ETC gantry on the edge of the toll road continuously collect vehicle passing electronic data in real time, and the data covers rich information such as transaction log, license plate number, vehicle type, passing time, passing route, high-definition picture, passing video and the like. The collected data is rapidly transmitted to the blockchain client application, the client application performs summary calculation, time stamp superposition and digital signature processing according to the above process, and then sends the processed data to the access calculation module through a secure channel, thereby completing the preliminary collection and preprocessing of the data.

[0033] After the access calculation module receives the data, the verification processing module immediately starts the digital signature verification process, and uses a digital signature verification algorithm to judge the legality of the data. If the signature verification is passed, the smart contract starts to execute, and performs comprehensive format verification, charging rule matching and data integrity check on the electronic data, to ensure the accuracy and compliance of the data.

[0034] The verified data enters the dynamic encryption module, which generates an encryption key by calculation according to the electronic data transaction serial number and the road segment public key coordinates, and encrypts the processed electronic data to protect the security of the data in the storage and transmission process.

[0035] The encrypted data is packaged by the blockchain storage module according to the block structure of the blockchain, to form a block containing key information. The block is sent to all nodes through broadcasting, and each node verifies it according to the PBFT consensus algorithm. When more than 2 / 3 of the nodes pass the verification, the block is stored in the respective blockchain ledger, and the reliable storage of the electronic data is completed.

[0036] When there is a query demand, the evidence generation module obtains the storage information and the original electronic data from the blockchain storage module, generates a vehicle passing evidence chain according to the preset rules, and calls the notary office interface to generate an evidence report meeting the legal requirements, thereby providing strong evidence support for related businesses.

[0037] Embodiment three The third embodiment of the present application is based on the same inventive concept, and the present application provides a computer readable storage medium storing a computer program, which is executed by a processor to implement the steps of the image recognition method of the above-mentioned embodiments.

[0038] Embodiment four The fourth embodiment of the present application is based on the same inventive concept, and the present application provides a computer device, which includes a processor, a memory, and the processor and the memory communicate with each other. The memory is used to store instructions, and the processor is used to execute the instructions in the memory to execute the image recognition method of the above-mentioned embodiments.

[0039] It should be understood that portions of the present application can be implemented with hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented with software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, implementation can be with any or a combination of the following technologies, which are all well-known in the art: a discrete logic circuit having logic gates for implementing logic functions upon an application of data signals, an application specific integrated circuit having appropriate combinational logic gates, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0040] Finally, it should be noted that the above-mentioned only is the preferred embodiment of the present application, and is not used to limit the present application, although the present application is described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical scheme recorded in the foregoing embodiments can still be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. The highway network toll collection electronic evidence storage system, including the blockchain electronic evidence storage platform, is characterized by: The blockchain electronic evidence storage platform includes: Access calculation module: used to receive electronic data of vehicle traffic collected in real time from the edge of the toll road; Verification and processing module: used to verify the legitimacy of the signature of the vehicle pass electronic data, execute the smart contract to process the vehicle pass electronic data, and obtain the processed data; Dynamic encryption module: used to adopt dynamic password encryption mechanism, generate encryption key by taking vehicle pass electronic data transaction serial number and road section public key coordinates as factors to obtain encrypted data; Blockchain evidence module: used to package encrypted data into blocks according to the block structure of the blockchain, broadcast it to all nodes for consensus, and after the consensus is successful, form tamper-proof block data, which is stored on each node to form evidence information; Evidence generation module: used to generate a vehicle traffic evidence chain and a notary office evidence report based on query requirements, using stored evidence information and vehicle traffic electronic data according to preset rules; The edge of the toll road includes toll booths and ETC gantries, and the electronic data of vehicle traffic includes transaction flow, license plate number, vehicle model, travel time, travel route, high-definition pictures, and travel videos; The electronic data on vehicle traffic collected in real time at the edge of the toll road is processed by the blockchain client application deployed on the edge of the toll road and submitted to the access calculation module in real time. The processing includes performing summary calculation on the collected electronic data on vehicle traffic, adding a timestamp and performing a digital signature.

2. The highway network toll collection electronic evidence storage system according to claim 1 is characterized by: The verification adopts a digital signature verification algorithm, the smart contract includes electronic data format verification, billing rule matching, and data integrity check. All nodes include ETC provincial centers, ETC issuers, toll road management units, judicial appraisal agencies, and notary offices, and each node is interconnected through dedicated fiber optic lines and configured networks.

3. The highway network toll collection electronic evidence storage system according to claim 1 is characterized by: The dynamic password encryption mechanism generates a 64-bit batch factor from the transaction serial number of the electronic data. , combined with industry key management units , toll road management unit identification code , Industry key management unit public key coordinates ( , ) Perform SM3 summary calculation to obtain the summary value , and then For key pairs Do SM4 decryption and encryption respectively 、 , and the coordinates of the toll road management unit The coordinates are obtained after dot multiplication 、 ,according to and Calculate the encryption key of length 32 ;and ; ;in is the preset symmetric key, ( , ) is a point The coordinates of for point The coordinates of A preset constant.

4. The highway network toll collection electronic evidence storage system according to claim 3 is characterized by: The industry key management unit fills encryption keys and digital certificates for each toll road management unit through the key management module.

5. The highway network toll collection electronic evidence storage system according to claim 1 is characterized by: The preset rules include associating multi-dimensional data in chronological order, embedding blockchain evidence hash values, and consensus information. The vehicle pass evidence chain includes multi-dimensional data, blockchain evidence hash values, consensus time, and node signatures. The multi-dimensional data includes transaction flows, pictures, and videos.

6. A method for electronic evidence storage for networked highway toll collection, characterized by: The electronic evidence storage system for highway network toll collection as claimed in any one of claims 1 to 5 comprises the following steps: S1. Access calculation: Receive electronic data on vehicle traffic collected in real time from the edge of the toll road; S2. Verification and processing: Verify the legitimacy of the signature of the vehicle pass electronic data, execute the smart contract to process the vehicle pass electronic data, and obtain the processed data; S3. Dynamic encryption: Using a dynamic password encryption mechanism, the processed data is encrypted using the vehicle pass electronic data transaction serial number and the road section public key coordinates as factors to generate an encryption key to obtain encrypted data; S4. Blockchain Evidence Storage: Encrypted data is packaged into blocks according to the blockchain's block structure and broadcast to all nodes for consensus. After the consensus is successful, tamper-proof block data is formed and stored on each node to form evidence information; S5. Generate evidence: Based on the query requirements, use the stored evidence information and vehicle pass electronic data to generate the vehicle pass evidence chain and the notary office's evidence report according to the preset rules.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the electronic evidence storage method for highway network toll collection as described in claim 6 is implemented.

8. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed by the processor, the electronic evidence storage method for highway network toll collection as claimed in claim 6 is implemented.

Images