CN111341010A - Real-time maintenance method and device for goods information of unmanned goods shelf - Google Patents
Real-time maintenance method and device for goods information of unmanned goods shelf Download PDFInfo
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- CN111341010A CN111341010A CN202010110465.8A CN202010110465A CN111341010A CN 111341010 A CN111341010 A CN 111341010A CN 202010110465 A CN202010110465 A CN 202010110465A CN 111341010 A CN111341010 A CN 111341010A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F9/00—Details other than those peculiar to special kinds or types of apparatus
- G07F9/02—Devices for alarm or indication, e.g. when empty; Advertising arrangements in coin-freed apparatus
- G07F9/026—Devices for alarm or indication, e.g. when empty; Advertising arrangements in coin-freed apparatus for alarm, monitoring and auditing in vending machines or means for indication, e.g. when empty
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Abstract
The invention discloses a real-time maintenance method and a real-time maintenance device for goods information of an unmanned goods shelf, which are high in accuracy and good in real-time performance. The method comprises the following steps: initialization: resetting the goods lists of all goods channels of the goods shelf as the goods list of the goods channel, and initializing a virtual off-shelf goods pool; monitoring a goods shelf goods channel: monitoring the goods shelf lane in real time; entering a virtual off-shelf goods pool monitoring step when goods leave the goods passage, and entering a virtual off-shelf goods pool searching step when goods are added; monitoring the virtual off-shelf cargo pool: the goods leave the goods passage and join the virtual off-shelf goods pool, and the virtual off-shelf goods pool is monitored until the goods leave the virtual off-shelf goods pool; virtual off-shelf cargo pool search: adding goods into the goods passage, searching the virtual off-shelf goods pool, judging whether approximate goods exist in the virtual off-shelf goods pool or not, and if so, enabling the goods to leave the virtual off-shelf goods pool and enter a goods list of the goods passage corresponding to the goods shelf; if not, whether the foreign body is added into the cargo channel is further identified.
Description
Technical Field
The invention belongs to the technical field of unmanned goods shelf data identification, and particularly relates to a real-time maintenance method and device for goods information of an unmanned goods shelf, which are high in accuracy and good in real-time performance.
Background
Unattended selling modes such as unmanned shops, unmanned kiosks and the like are increasingly popularized. The maintenance of goods information on an unmanned goods shelf in an unattended selling place is a basic guarantee for guaranteeing timely replenishment and maintaining normal selling. The most important part of the maintenance of the goods information of the unmanned goods shelf is the quick and accurate recognition of the goods.
Currently, the goods identification technology includes weighing identification, RFID tag technology identification, and image identification.
The weighing identification is to detect the change of weight of the goods before and after the goods are placed or removed through a weighing sensor so as to determine the goods. The weight change of a certain area can be accurately detected through weighing identification, and under the condition that the commodity is known and the weight of the commodity is differentiated, the commodity can be identified through the weight change. However, if a plurality of kinds of articles are similar in weight or article information is unknown, accurate identification cannot be given. Since the commodity information is registered in advance, the commodity information from the commodity not disposed in the weighing area disposed in the current sensor is not known (for example, the commodity is misplaced in the non-original weighing area).
The RFID tag identification is realized by placing an electronic tag on each commodity, and when the commodity leaves a shelf, the electronic tag can be identified as the corresponding commodity by a receiving and reading device. The RFID tag technology can determine what the corresponding goods are by reading the tags, and the accuracy is high. The disadvantage is that each electronic tag is costly (0.4-0.5 dollar) and cannot be recycled, and the user can damage the tag.
The image recognition is to compare the features on the image of the recognized commodity with the training model, so as to give the probability that the article is recognized as a certain commodity.
The chinese patent application "commodity detection method and apparatus for an unmanned shelf, and retail terminal" (application No. 201811221070.4, published: 2019.03.29) discloses a commodity detection method for an unmanned shelf using a target detection cooperating with an image retrieval technique, including: acquiring a collected commodity image on each layer in the unmanned goods shelf; cutting the commodity picture and inputting an object type detection model obtained by pre-training; outputting the position and the size of each commodity in the commodity image according to the object type detection model; and searching and outputting the commodity types and the quantity of each category in the commodity image in a commodity image standard library.
However, the recognition accuracy due to image recognition depends on the training model and is affected by the physical environment. The recognition accuracy of the well-trained commodities can reach more than 90% in an ideal environment, but the commodities are easily affected by article shielding and image noise pollution, so that misjudgment or misjudgment is realized.
Therefore, the prior art has the problems that: due to the limitation of commodity identification technology, the accuracy of goods information of the unmanned goods shelf is low, the real-time performance is poor, the accuracy and the real-time performance of replenishment and settlement are affected, and the consumption experience of customers is also reduced.
Disclosure of Invention
The invention aims to provide a real-time maintenance method for goods information of an unmanned goods shelf, which is high in accuracy and good in real-time performance.
Another object of the present invention is to provide a device for maintaining information of goods on an unmanned shelf in real time, so as to achieve accurate and timely maintenance of information of goods on an unmanned shelf.
The technical solution for realizing the purpose of the invention is as follows:
a real-time maintenance method for goods information of an unmanned goods shelf comprises the following steps:
initialization: resetting the goods lists of all goods channels of the goods shelf as the goods list of the goods channel, and initializing a virtual off-shelf goods pool;
monitoring a goods shelf goods channel: monitoring the goods shelf lane in real time; entering a virtual off-shelf goods pool monitoring step when goods leave the goods passage, and entering a virtual off-shelf goods pool searching step when goods are added;
monitoring the virtual off-shelf cargo pool: the goods leave the goods passage and join the virtual off-shelf goods pool, and the virtual off-shelf goods pool is monitored until the goods leave the virtual off-shelf goods pool;
virtual off-shelf cargo pool search: adding goods into the goods passage, searching the virtual off-shelf goods pool, judging whether approximate goods exist in the virtual off-shelf goods pool or not, and if so, enabling the goods to leave the virtual off-shelf goods pool and enter a goods list of the goods passage corresponding to the goods shelf; if not, whether the foreign body is added into the cargo channel is further identified.
Preferably, the virtual off-shelf cargo pool monitoring step includes:
and leaving message reporting: when the goods leave the goods way, triggering the gravity sensor and reporting a gravity reduction message;
and (3) judging leaving authority: judging whether the goods leave the goods channel to be a tallying behavior or a consuming behavior according to whether the management authority is started or not;
the management authority initiates the leaving process: if the management authority is started, emptying the current goods shelf and adding goods information;
the non-administrative authority initiates the leaving process: and if the goods leave the goods channel is a consumption behavior, searching the goods in the virtual off-shelf goods pool corresponding to the goods channel to obtain a goods or goods combination list, and maintaining the goods list corresponding to the virtual off-shelf goods pool of the corresponding goods channel.
The technical scheme for realizing the other purpose of the invention is as follows:
an unmanned shelf goods information real-time maintenance device, comprising:
the initialization module 1 is used for resetting the goods lists of all goods channels of the goods shelf as the goods list of the goods channel and initializing the virtual off-shelf goods pool;
the goods shelf goods way monitoring module 2 is used for monitoring the goods shelf goods way in real time; when goods leave the goods passage, the goods enter the virtual off-shelf goods pool monitoring module 3, and when goods are added, the goods enter the virtual off-shelf goods pool searching module 4;
the virtual off-shelf cargo pool monitoring module 3 is used for adding goods to the virtual off-shelf cargo pool after leaving the goods passage, monitoring the virtual off-shelf cargo pool until the goods leave the virtual off-shelf cargo pool;
the virtual off-shelf goods pool searching module 4 is used for adding goods into the goods channel, searching the virtual off-shelf goods pool, judging whether approximate goods exist in the virtual off-shelf goods pool or not, and if so, enabling the goods to leave the virtual off-shelf goods pool and enter a goods list of the goods channel corresponding to the goods shelf; if not, whether the foreign body is added into the cargo channel is further identified.
Preferably, the virtual off-rack cargo pool monitoring module 3 includes:
a leaving message reporting unit 301, configured to trigger the gravity sensor to report a gravity reduction message when the goods leave the cargo way;
the leaving authority judging unit 302 is configured to judge whether the goods leaves the goods channel as a tallying behavior or a consuming behavior according to whether the management authority is activated;
the management authority starting leaving processing unit 303 is used for emptying the current shelf and adding goods information if the management authority is started;
the management authority starts the leaving processing unit 304, which is used to perform item search on the virtual off-shelf goods pool corresponding to the lane to obtain an item or item combination list if the item leaving the lane is a consumption behavior, and maintain the item list corresponding to the virtual off-shelf goods pool of the corresponding lane.
Compared with the prior art, the invention has the following remarkable advantages:
1. the accuracy is high: by adopting a virtual shelf management mode, the invention realizes real-time maintenance of goods information, can manage abstract management objects, supports wrong taking and putting of goods, supports foreign matter identification and goods inventory, saves real-time computing resources and improves the success rate and fault-tolerant rate of goods identification;
2. the real-time property is as follows: the invention comprises a virtual shelf management module, and obtains the effects of real-time maintenance of goods information on shelves and real-time maintenance of off-shelf goods information by adding virtual management objects such as all goods channels, virtual off-shelf goods pools, goods-on-shelf goods pools and the like of actual shelves.
The invention is described in further detail below with reference to the figures and the detailed description.
Drawings
Fig. 1 is a main flow chart of an embodiment of the real-time maintenance method for the information of the unmanned goods shelf in the invention.
Fig. 2 is a flowchart of the virtual off-shelf cargo pool monitoring step of fig. 1.
Fig. 3 is a block diagram showing the structure of an embodiment of the real-time maintenance device for the information of the unmanned goods shelf according to the invention.
Fig. 4 is a block diagram of the virtual off-shelf cargo pool monitoring module of fig. 3.
In the figure, an article list resetting module 1, a shelf lane monitoring module 2, a virtual off-shelf goods pool monitoring module 3, a virtual off-shelf goods pool searching module 4, a leaving message reporting unit 301, a leaving authority judging unit 302, a management authority starting leaving processing unit 303, and a non-management authority starting leaving processing unit 304.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As shown in fig. 1, as an embodiment of the method for maintaining the information of the unmanned shelf goods in real time according to the present invention, the method includes the following steps:
(10) initialization: resetting the goods lists of all goods channels of the goods shelf as the goods list of the goods channel, and initializing a virtual off-shelf goods pool;
resetting the item list may occur by two things: such as a restocking action by a tally clerk, or initial activation of the system.
When the administrator authority is activated, it is determined to replenish the tally clerk.
The administrator privileges may be initiated, for example, by swiping an administrator two-dimensional code.
When the shelf is started for the first time, the shelf diagram is preferably adopted to pre-configure the goods corresponding to all the goods channels on all the shelves, and a goods list is initialized for each goods channel of each shelf.
(20) Monitoring a goods shelf goods channel: monitoring the goods shelf lane in real time; entering a virtual off-shelf goods pool monitoring step when goods leave the goods passage, and entering a virtual off-shelf goods pool searching step when goods are added;
(30) monitoring the virtual off-shelf cargo pool: goods leave the goods way and join in the virtual off-shelf goods pool, and the virtual off-shelf goods pool is monitored until the goods leave the virtual off-shelf goods pool.
Reasons for the goods leaving the virtual off-shelf goods pool include being consumed or emptied of tallies;
as shown in fig. 2, the (30) virtual off-shelf cargo pool monitoring step includes:
(31) and leaving message reporting: when the goods leave the goods way, triggering the gravity sensor and reporting a gravity reduction message;
(32) and (3) judging leaving authority: judging whether the goods leave the goods channel to be a tallying behavior or a consuming behavior according to whether the management authority is started or not;
(33) the management authority initiates the leaving process: if the management authority is started, emptying the current goods shelf and adding goods information;
(34) the non-administrative authority initiates the leaving process: and if the goods leave the goods channel is a consumption behavior, searching the goods in the virtual off-shelf goods pool corresponding to the goods channel to obtain a goods or goods combination list, and maintaining the goods list corresponding to the virtual off-shelf goods pool of the corresponding goods channel.
(40) Virtual off-shelf cargo pool search: adding goods into the goods passage, searching the virtual off-shelf goods pool, judging whether approximate goods exist in the virtual off-shelf goods pool or not, and if so, enabling the goods to leave the virtual off-shelf goods pool and enter a goods list of the goods passage corresponding to the goods shelf; if not, whether the foreign body is added into the cargo channel is further identified.
And in the step (40), searching whether similar goods exist in the virtual off-shelf goods pool or not by using the weight of the goods as an index.
The capacity of maintaining the current goods list on the shelves in real time is given to the unmanned shelves through a virtual shelf management method.
The method is not limited to which item identification technology is used. Taking the method of weighing and identifying goods as an example, the basic idea of goods identification is to find and identify goods with the same weight according to the weight change value returned by the weighing sensor. However, since the input of the goods identification only has the weight parameter, the goods identification is greatly interfered in the case that the nominal weight of the goods is close to or has integral multiple relation. In addition, in the actual operation of an unmanned store, there are cases where a plurality of people take goods at the same time and the goods are placed at will. In order to improve the accuracy of goods identification as much as possible and meet the requirements under complex operation conditions, a goods pool goods search algorithm and virtual shelf management are introduced. Wherein the goods pool goods search algorithm is used to search all goods combinations meeting the "weight equivalent" criterion in the designated goods pool, which is not described here. The virtual shelf management can improve the accuracy of goods identification and can be freely expanded according to user scenes and product requirements.
Strictly speaking, the object of virtual shelf management is not an actual shelf, but designates a pool of goods on a target area. In other words, the virtual shelf manages an abstract goods pool, which can be a real goods channel on the shelf, a virtual off-shelf goods pool, or even a virtual shopping cart of the user. These various pools share a common objective of always providing the item portfolio algorithm with the most appropriate range of pools, which may increase the accuracy of item portfolio identification. For example, for goods off-shelf, we only need to care about the combination of goods on the lane where the weight changes. For goods shelving, we only need to care whether the goods come from the goods abandoned by the user, or are restocked or renewed from the tally clerk.
The virtual shelf can be expanded according to the product requirements or the scene requirements, for example, the objects of virtual shelf management can be:
1. all lanes of the actual shelf. The items on the actual lane are by default items from the corresponding lane pre-configured (e.g., the grid diagram configures basic information of the items). If other goods in the goods channel are placed on the goods channel, the goods information is added on the goods channel, and the inventory is recorded and marked as foreign goods.
2. A virtual off-shelf cargo pool. An off-shelf stock pool refers to all items that leave the shelf but have not yet been settled. The virtual goods pool is mainly set up to support the goods disorderly placing function, and goods which are not wanted by a user can be placed on a non-original goods channel conveniently under common conditions. It is worth mentioning that the item is time-attributed once off-shelf, and that it is added to the user's virtual shopping cart with the help of image recognition, if an off-shelf item is assigned to a specific user. The above two characteristics can be selected and utilized according to the requirement.
3. And the goods loading pool of the tally clerk. The mode of delivery should be different from the user shopping. The goods on the tally clerk come from the goods loading pool instead of the off-shelf goods pool.
The invention has the advantages that:
1. the goods information of the unmanned goods shelf can be maintained in real time. The functions of wrong taking and putting of goods, foreign matter identification and goods checking are supported naturally.
2. The consumption of computing resources is low. Whether the goods leave or join the lane, the goods in the corresponding goods pool are always limited and definite.
3. And the expansibility is strong. The expansion can be carried out according to the product requirements or the scene requirements, and only the virtual shelf is required to be added with a management object. For example, image recognition extensions may be added, user virtual shopping cart extensions may be added, and so forth.
4. The method is isolated from the goods searching algorithm, can design a general goods pool searching algorithm, and can also design a special goods pool searching algorithm so as to improve the accuracy of searching and identifying.
As shown in fig. 3, another embodiment of the apparatus for real-time maintenance of goods information on unmanned shelves according to the present invention comprises:
the initialization module 1 is used for resetting the goods lists of all goods channels of the goods shelf as the goods list of the goods channel and initializing the virtual off-shelf goods pool;
the goods shelf goods way monitoring module 2 is used for monitoring the goods shelf goods way in real time; when goods leave the goods passage, the goods enter the virtual off-shelf goods pool monitoring module 3, and when goods are added, the goods enter the virtual off-shelf goods pool searching module 4;
the virtual off-shelf cargo pool monitoring module 3 is used for adding goods to the virtual off-shelf cargo pool after leaving the cargo channel, and monitoring the virtual off-shelf cargo pool until the goods are consumed or the goods are cleared;
the virtual off-shelf goods pool searching module 4 is used for adding goods into the goods channel, searching the virtual off-shelf goods pool, judging whether approximate goods exist in the virtual off-shelf goods pool or not, and if so, enabling the goods to leave the virtual off-shelf goods pool and enter a goods list of the goods channel corresponding to the goods shelf; if not, whether the foreign body is added into the cargo channel is further identified.
As shown in fig. 4, the virtual off-rack cargo pool monitoring module 3 includes:
a leaving message reporting unit 301, configured to trigger the gravity sensor to report a gravity reduction message when the goods leave the cargo way;
the leaving authority judging unit 302 is configured to judge whether the goods leaves the goods channel as a tallying behavior or a consuming behavior according to whether the management authority is activated;
the management authority starting leaving processing unit 303 is used for emptying the current shelf and adding goods information if the management authority is started;
the non-management authority starts the leaving processing unit 304, which is used for performing item search on the virtual off-shelf goods pool corresponding to the goods lane to obtain an item or item combination list if the item leaving the goods lane is a consumption behavior, and maintaining the item list corresponding to the virtual off-shelf goods pool of the corresponding goods lane.
The purchase departure processing unit 304, the maintaining the item list comprising:
if only one or more goods exist in the goods list, maintaining the corresponding virtual off-shelf goods pool goods list;
and if a plurality of goods or goods combinations exist in the goods list, confirming the goods through image recognition, and maintaining the corresponding virtual off-shelf goods pool goods list.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A real-time maintenance method for goods information of an unmanned goods shelf is characterized by comprising the following steps:
initialization: resetting the goods lists of all goods channels of the goods shelf as the goods list of the goods channel, and initializing a virtual off-shelf goods pool;
monitoring a goods shelf goods channel: monitoring the goods shelf lane in real time; entering a virtual off-shelf goods pool monitoring step when goods leave the goods passage, and entering a virtual off-shelf goods pool searching step when goods are added;
monitoring the virtual off-shelf cargo pool: the goods leave the goods passage and join the virtual off-shelf goods pool, and the virtual off-shelf goods pool is monitored until the goods leave the virtual off-shelf goods pool;
virtual off-shelf cargo pool search: adding goods into the goods passage, searching the virtual off-shelf goods pool, judging whether approximate goods exist in the virtual off-shelf goods pool or not, and if so, enabling the goods to leave the virtual off-shelf goods pool and enter a goods list of the goods passage corresponding to the goods shelf; if not, whether the foreign body is added into the cargo channel is further identified.
2. The real-time maintenance method of the information on the unmanned goods shelf according to claim 1, characterized in that:
in the initialization step, the grids are adopted to pre-configure the goods corresponding to all the goods channels on all the shelves, and a goods list is initialized for each goods channel of each shelf.
3. The method for maintaining information of unmanned aerial vehicle goods according to any one of claims 1 and 2, wherein:
in the step of searching the virtual off-shelf goods pool, the weight of goods is used as an index to search whether approximate goods exist in the virtual off-shelf goods pool or not.
4. The method for maintaining information of unmanned aerial vehicle goods according to any one of claims 1 and 2, wherein:
in the step of searching the virtual off-shelf goods pool, when approximate goods do not exist in the virtual off-shelf goods pool, image recognition is adopted to further judge whether the goods added into the goods channel are foreign matters or not.
5. The real-time maintenance method of the information of the unmanned goods shelves of claim 1, characterized in that the virtual off-shelf goods pool monitoring step comprises:
and leaving message reporting: when the goods leave the goods way, triggering the gravity sensor and reporting a gravity reduction message;
and (3) judging leaving authority: judging whether the goods leave the goods channel and starting management authority or not;
the management authority initiates the leaving process: if the management authority is started, emptying the current goods shelf and adding goods information;
the non-administrative authority initiates the leaving process: and if the management authority is not started, carrying out goods search on the virtual off-shelf goods pool corresponding to the goods channel to obtain a goods or goods combination list, and maintaining the goods list corresponding to the virtual off-shelf goods pool of the corresponding goods channel.
6. The method for maintaining information on unmanned aerial vehicle items in real time according to claim 5, wherein in the step of purchasing away processing, the maintaining of the item list includes:
if only one goods exists in the goods list, maintaining the corresponding virtual off-shelf goods pool goods list;
and if a plurality of goods combinations exist in the goods list, confirming the goods through image recognition, and maintaining the corresponding virtual off-shelf goods pool goods list.
7. The utility model provides an unmanned goods shelves goods information real-time maintenance device which characterized in that includes:
the initialization module (1) is used for resetting the goods lists of all goods channels of the goods shelf as the goods list of the goods channel and initializing the virtual off-shelf goods pool;
the goods shelf goods way monitoring module (2) is used for monitoring the goods shelf goods way in real time; when goods leave the goods passage, the goods enter a virtual off-shelf goods pool monitoring module (3), and when goods are added, the goods enter a virtual off-shelf goods pool searching module (4);
the virtual off-shelf goods pool monitoring module (3) is used for adding goods leaving the goods passage into the virtual off-shelf goods pool, monitoring the virtual off-shelf goods pool until the goods leave the virtual off-shelf goods pool;
the virtual off-shelf goods pool searching module (4) is used for adding goods into the goods channel, searching the virtual off-shelf goods pool, judging whether approximate goods exist in the virtual off-shelf goods pool or not, and if so, enabling the goods to leave the virtual off-shelf goods pool and enter a goods list of the goods channel corresponding to the goods shelf; if not, whether the foreign body is added into the cargo channel is further identified.
8. The real-time maintenance device for the information of the unmanned goods shelf according to claim 7, characterized in that:
in the virtual off-shelf goods pool searching module (4), when approximate goods do not exist in the virtual off-shelf goods pool, image recognition is adopted to further judge whether the goods added into the goods channel are foreign matters or not.
9. The real-time maintenance device for the information of the unmanned goods shelves according to claim 7, characterized in that the virtual off-shelf goods pool monitoring module (3) comprises:
a leaving message reporting unit (301) for triggering the gravity sensor to report a gravity reduction message when the goods leave the goods way;
a leaving authority judging unit (302) for judging whether the goods leave the goods channel and the management authority is started;
the management authority starting leaving processing unit (303) is used for emptying the current shelf and adding goods information if the management authority is started;
and the management authority starting and leaving processing unit (304) is used for searching goods in the virtual off-shelf goods pool corresponding to the goods channel to obtain a goods or goods combination list and maintaining the goods list corresponding to the virtual off-shelf goods pool of the corresponding goods channel if the management authority is not started.
10. The unmanned shelf item information real-time maintenance device according to claim 7, wherein in the purchase departure processing unit (304), the maintenance item list includes:
if only one goods exists in the goods list, maintaining the corresponding virtual off-shelf goods pool goods list;
and if a plurality of goods combinations exist in the goods list, confirming the goods through image recognition, and maintaining the corresponding virtual off-shelf goods pool goods list.
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