Method, device and refrigerator for improving identification rate of RFID tag

Abstract

The present invention discloses a method, device and refrigerator for improving the recognition rate of RFID tags. The method includes: obtaining all RFID tags detected during the opening of the refrigerator door, obtaining the continuous change interval of the signal strength of each tag, and obtaining the initial signal strength A1 and the final signal strength A2 of each tag; obtaining the signal strength A0 of the RFID tag at a preset position of the refrigerator door; putting the foods corresponding to all the tags with A1 < A0 and A2 > A0 into the first food set, and the first food set is all the foods put into the refrigerator from the outside during the opening of the refrigerator. Compared with the prior art, the method for improving the recognition rate of RFID tags according to the present invention can reduce or even eliminate the influence of foods being blocked and resulting in the failure to recognize the RFID tags carried by the foods, and improve the recognition rate of RFID tags. After multiple tests, by using the method for improving the recognition rate of RFID tags according to the present invention, the recognition rate of the foods in the refrigerator can be increased to 91%, greatly improving the user experience.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, and particularly to a method, device and refrigerator for improving the recognition rate of RFID tags. Background Art

[0002] As the main carrier for storing household food, the refrigerator is an essential equipment for ensuring food nutrition and health. The intelligent transformation is the development direction of refrigerator products. With the research of Radio Frequency Identification (RFID) technology, RFID technology has been gradually applied to the field of smart refrigerator technology.

[0003] By using RFID technology, all the information of the food with RFID tags stored in the refrigerator can be obtained by detecting the RFID tags on the food.

[0004] However, since some of the food in the refrigerator may be blocked, the RFID technology cannot identify these foods, resulting in a low recognition rate. For example, although the user clearly puts 10 items with RFID tags, only 7 items are actually recognized, and 3 items cannot be recognized due to being blocked. Summary of the Invention

[0005] The purpose of the present invention is to provide a method, device and refrigerator for improving the recognition rate of RFID tags.

[0006] To achieve one of the above-mentioned invention purposes, an embodiment of the present invention provides a method for improving the recognition rate of RFID tags. The method is applied to a refrigerator equipped with a radio frequency identification reading module, and the method includes:

[0007] Obtain all the RFID tags detected during the opening of the refrigerator door, obtain the continuous change interval of the signal intensity of each tag, and obtain the initial signal intensity A1 and the final signal intensity A2 of each tag;

[0008] Obtain the signal intensity A0 of the RFID tag at a preset position of the refrigerator door;

[0009] Put the food corresponding to all the tags with A1 < A0 and A2 > A0 into the first food set, and the first food set is all the food put into the refrigerator from the outside during the opening of the refrigerator.

[0010] As a further improvement of an embodiment of the present invention, the method further includes:

[0011] Put the food corresponding to all the tags with A1 > A0 and A2 < A0 into the second food set, and the second food set is all the food taken out of the refrigerator to the outside during the opening of the refrigerator door.

[0012] As a further improvement to one embodiment of the present invention, the method further includes:

[0013] Information about the food in the first food set is written into a food storage database. The food storage database records information about the food with RFID tags inside the refrigerator, which is obtained by the radio frequency identification reading module before the refrigerator door is opened.

[0014] As a further improvement to one embodiment of the present invention, the method further includes:

[0015] The information of the food in the second food set is deleted from the food storage database, and finally the food recorded in the food storage database is all the food stored in the refrigerator after the refrigerator door is closed.

[0016] As a further improvement of one embodiment of the present invention, the radio frequency identification reading module is disposed on the central axis of the top of the refrigerator, and the central axis isolates the refrigerator door and the refrigerator back panel.

[0017] As a further improvement to one embodiment of the present invention, the method further includes:

[0018] During the period when the refrigerator door is detected to be open, the radio frequency identification reading module detects all RFID tags within the identification range, identifies each RFID tag to obtain information about the corresponding food, and continuously measures the signal strength of each tag.

[0019] As a further improvement to one embodiment of the present invention, the method further includes:

[0020] If A1>A0 and A2>A0 for a certain label, then the food with the label is determined to have been moved inside the refrigerator.

[0021] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the program to implement the steps in any of the above-described methods for improving RFID tag recognition rate.

[0022] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a refrigerator, which includes the electronic equipment described above.

[0023] As a further improvement to one embodiment of the present invention, it also includes a refrigerator door, a door opening / closing detection module, a radio frequency identification reading module, and an information processing module, wherein:

[0024] The door opening and closing detection module is used to detect the opening and closing status of the refrigerator door;

[0025] The radio frequency identification (RFID) reading module is configured to detect all RFID tags within the detection range during the period when the refrigerator door is detected to be opened, identify each RFID tag to obtain information about the corresponding food, and continuously measure the signal strength of each of the tags without interruption.

[0026] The information processing module is configured to obtain the continuous change range of the signal strength of each RFID tag during the opening of the refrigerator door, to obtain the initial signal strength A1 and the final signal strength A2 of each tag; and put the foods corresponding to all the tags where A1 < A0 and A2 > A0 into a first food set, where the first food set is all the foods put into the refrigerator from the outside during the opening of the refrigerator, and A0 is the signal strength of the RFID tag at the preset position of the refrigerator door.

[0027] Compared with the prior art, the method for improving the recognition rate of RFID tags according to the present invention can reduce or even eliminate the influence of food occlusion on the failure to recognize the RFID tags carried by the food, and improve the recognition rate of RFID tags. After multiple tests, using the method for improving the recognition rate of RFID tags according to the present invention, the recognition rate of the foods in the refrigerator can be increased to 91%, greatly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic flowchart of the method for improving the recognition rate of RFID tags according to the present invention.

[0029] Figure 2 is a schematic structural diagram of a refrigerator according to the present invention.

[0030] Figure 3 is a structural block diagram of a refrigerator according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be described in detail below in conjunction with the specific embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included within the protection scope of the present invention.

[0032] The following is an example of using RFID technology to detect foods in a refrigerator in the prior art. As shown in the following table, 12 steaks were placed in the refrigerator during the opening of the refrigerator door. These 12 steaks were randomly stacked together. After the refrigerator door was closed, the recognition rates of the steaks were 75% and 66.6% respectively. And there was a problem of low recognition rate in subsequent repeated multiple experiments.

[0033] steak NFC number first The second 1 E76A Recognizable Recognizable 2 F24C Unrecognized Unrecognized 3 E15B Recognizable Recognizable 4 E76B Recognizable Recognizable 5 E15A Recognizable Recognizable 6 ECC1 Recognizable Recognizable 7 E769 Unrecognized Unrecognized 8 E541 Recognizable Recognizable 9 E15C Recognizable Recognizable 10 E76C Recognizable Recognizable 11 869F Unrecognized Unrecognized 12 8F5D Recognizable Unrecognized

[0034] In view of this, the present invention provides a method for improving the recognition rate of RFID tags, the method having a simple calculation process and a high recognition rate.

[0035] like Figure 1 As shown, the method is applied to a refrigerator equipped with a radio frequency identification (RFID) reading module, and includes:

[0036] Step S100: Obtain all RFID tags detected during the opening of the refrigerator door, obtain the continuous variation range of the signal strength of each tag, and obtain the initial signal strength A1 and the final signal strength A2 of each tag.

[0037] The method of this invention is applied to a refrigerator, which is equipped with a door opening / closing detection module for detecting the opening and closing status of the refrigerator door. During the time period when the refrigerator door is detected to be open, the radio frequency identification (RFID) reading module detects all RFID tags within the identification range, identifies each RFID tag to obtain information about the corresponding food, and continuously measures the signal strength of each tag.

[0038] Because the RFID reading module continuously measures the signal strength of each tag, the change in the signal strength of the tag carried by the food is continuous during the movement of the food, while the change in the signal strength of the tag carried by the food is discontinuous or stepped after the food is covered.

[0039] It should be noted that whether the changes in signal strength are continuous can be determined by whether the absolute value of the difference between two adjacent points is less than a preset value. For example, if the signal strength of the tag on food A that is continuously detected during the opening of the refrigerator door is {34,36,38,40,42,44,46,44,42,30,17,0}, and the preset value is 5, then the interval {40,41,42,43,44,45,44,43,42} is the interval of continuous signal strength change, and the interval {42,30,17,0} is the interval of discontinuous signal strength change.

[0040] Then, the continuous variation range of the signal strength of each tag is obtained to get the initial signal strength A1 and the final signal strength A2 of each tag.

[0041] It should be noted that by selecting the continuous range of signal strength variation for each tag and excluding the discontinuous range, the influence of signal strength weakening or even disappearing due to food stacking can be eliminated. That is, even if the signal strength of a certain food is completely blocked by other foods, it can still be detected by the method of this invention.

[0042] Step S200: Obtain the signal strength A0 of the RFID tag at the preset position on the refrigerator door.

[0043] Step S300: Put the foods corresponding to all the tags where A1 < A0 and A2 > A0 into the first food set, and the first food set is all the foods put into the interior of the refrigerator from the outside during the opening of the refrigerator.

[0044] It should be noted that the RFID reading module is set on the central axis of the top of the refrigerator, and the central axis isolates the refrigerator door and the refrigerator back panel.

[0045] Therefore, as Figure 2 shown, since the RFID reading module is installed at the middle position on the top, the signal intensity detected for the RFID tag located at the midpoint between the refrigerator door and the refrigerator back panel (position R in the figure) is the maximum, while the signal intensity gradually weakens towards both sides (the refrigerator door direction and the refrigerator back panel direction), and the signal intensity at the preset position of the refrigerator door (position S1 in the figure) and the preset position of the back panel (position S2 in the figure) is the lowest point A0 of the signal intensity on the same horizontal plane inside the refrigerator. That is, on the same horizontal plane, the signal intensity detected for the RFID tags carried by the foods inside the refrigerator is greater than A0, while the signal intensity detected for the RFID tags carried by the foods outside the refrigerator is less than A0.

[0046] Therefore, if during the opening of the refrigerator door, for a certain tag, A1 < A0 and A2 > A0, it means that the food corresponding to this tag is put into the interior of the refrigerator from outside the refrigerator.

[0047] Put the foods corresponding to all the tags where A1 < A0 and A2 > A0 into the first food set, and the first food set is all the foods put into the interior of the refrigerator from the outside during the opening of the refrigerator.

[0048] Through the method of the present invention, even if some newly put foods are blocked, they can still be detected and recognized, thereby improving the recognition rate of RFID tags. After multiple tests, by using the method for improving the recognition rate of RFID tags of the present invention, the recognition rate of the foods in the refrigerator can be increased to 91%, greatly improving the user experience.

[0049] In a specific embodiment, the method further includes:

[0050] According to the previous description, if during the opening of the refrigerator door, for a certain tag, A1 > A0 and A2 < A0, it means that the food corresponding to this tag is taken from the interior of the refrigerator to the outside.

[0051] Put the foods corresponding to all the tags where A1 > A0 and A2 < A0 into the second food set, and the second food set is all the foods taken from the interior of the refrigerator to the outside during the opening of the refrigerator door.

[0052] Furthermore, the method also includes:

[0053] Information about the food in the first food set is written into a food storage database. The food storage database records information about the food with RFID tags inside the refrigerator, which is obtained by the radio frequency identification reading module before the refrigerator door is opened.

[0054] Before the refrigerator door opening and closing detection module detects that the refrigerator door is open, the radio frequency identification reading module detects all RFID tags inside the refrigerator, identifies each RFID tag to obtain information about the corresponding food, and combines the information of all the detected food into a food storage database.

[0055] Since the food in the first food set consists of food that was placed inside the refrigerator from outside, the information of the food in the first food set will be written into the food storage database.

[0056] Furthermore, the method also includes:

[0057] The information of the food in the second food set is deleted from the food storage database, and finally the food recorded in the food storage database is all the food stored in the refrigerator after the refrigerator door is closed.

[0058] Since the food in the second food set consists of food taken out of the refrigerator and moved to the outside, their information needs to be deleted from the food storage database so that the food ultimately recorded in the food storage database consists of all the food stored in the refrigerator after the refrigerator door is closed.

[0059] In a preferred embodiment, the method further includes:

[0060] If A1>A0 and A2>A0 for a certain label, then the food with the label is determined to have been moved inside the refrigerator.

[0061] The present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the program to implement any one of the steps in the above-described methods for improving RFID tag recognition rate, that is, to implement any one of the steps in the above-described technical solutions for improving RFID tag recognition rate.

[0062] The present invention also provides a refrigerator that includes the electronic device described above.

[0063] Specifically, such as Figure 3 As shown, the refrigerator also includes a refrigerator door 10, a door opening and closing detection module 20, a radio frequency identification reading module 30, and a signal processing module 40.

[0064] The door opening and closing detection module is used to detect the opening and closing state of the refrigerator door. In this embodiment, the door opening and closing detection module may include a pressure sensor, and the pressure sensor can send electrical signals of different intensities according to the magnitude of the pressure it receives. The pressure sensor can be installed on the contact surface between the refrigerator body and the refrigerator door. When the refrigerator door is opened and closed, the pressure sensed by the pressure sensor is different, and the opening and closing state of the refrigerator door is determined by sending electrical signals of different intensities to the refrigerator main control board.

[0065] The radio frequency identification reading module is used to detect all RFID tags within the detection range during the period when the refrigerator door is detected to be opened, identify each RFID tag to obtain information about the corresponding food, and continuously measure the signal strength of each of the tags.

[0066] Radio Frequency Identification (RFID) technology is a communication technology that can identify specific targets and read and write relevant data through radio signals without establishing mechanical or optical contact between the identification system and the specific target. Its most important advantage is non-contact identification, and the reading speed is extremely fast, usually less than 100 milliseconds in most cases. Therefore, RFID technology has great application prospects in smart refrigerators and can bring an unpredictable huge space for the intelligence of refrigerators.

[0067] In the field of refrigerators, RFID electronic tags can be configured on the refrigerator to achieve control of the refrigerator during the production, transportation, and use processes; an RFID reader (i.e., the radio frequency identification reading module) can also be configured on the refrigerator, and electronic tags can be configured on the stored food to achieve intelligent management of food by the refrigerator. The electronic tags configured on the stored food can contain various basic information of the food, such as the name, type, production date, shelf life, weight, etc.

[0068] The information processing module is used to obtain the continuous change interval of the signal strength of each RFID tag during the opening of the refrigerator door, and obtain the initial signal strength A1 and the final signal strength A2 of each tag; and put the foods corresponding to all the tags where A1 < A0 and A2 > A0 into the first food set, where the first food set is all the foods put into the refrigerator from the outside during the opening of the refrigerator, and A0 is the signal strength of the RFID tag at the preset position of the refrigerator door.

[0069] Furthermore, the signal processing module is also used to put the foods corresponding to all the tags where A1 > A0 and A2 < A0 into the second food set, and the second food set is all the foods taken out of the refrigerator and brought to the outside during the opening of the refrigerator door.

[0070] Furthermore, the signal processing module is also used to write the information of the food in the first food set into the food storage database, and to delete the information of the food in the second food set from the food storage database. The food storage database records information about the food with RFID tags inside the refrigerator, obtained by the radio frequency identification reading module before the refrigerator door is opened. Ultimately, the food recorded in the food storage database after processing by the signal processing module represents all the food stored inside the refrigerator after the refrigerator door is closed.

[0071] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0072] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for improving the recognition rate of RFID tags, the method being applied to a refrigerator equipped with a radio frequency identification reading module, characterized in that, The method includes: Obtain all RFID tags detected during the opening of the refrigerator door, obtain the continuous change interval of the signal intensity of each tag, and obtain the initial signal intensity A1 and the final signal intensity A2 of each tag. The continuous change interval is used to exclude the influence of non - continuous signal changes caused by food occlusion; Obtain the signal intensity A0 of the RFID tag at a preset position of the refrigerator door; Put the foods corresponding to all tags where A1 < A0 and A2 > A0 into the first food set. The first food set is all the foods put into the refrigerator from the outside during the opening of the refrigerator; Among them, the continuous change interval satisfies that the absolute value of the difference in signal intensity between two adjacent samplings is less than a preset value.

2. The method for improving RFID tag recognition rate according to claim 1, characterized in that, The method further includes: Put the foods corresponding to all tags where A1 > A0 and A2 < A0 into the second food set. The second food set is all the foods taken out of the refrigerator to the outside during the opening of the refrigerator door.

3. The method for improving RFID tag recognition rate according to claim 2, characterized in that, The method further includes: Write the information of the foods in the first food set into the food storage database. The food storage database records the information of the foods with RFID tags inside the refrigerator obtained by using the radio frequency identification reading module before the refrigerator door is opened.

4. The method for improving RFID tag recognition rate according to claim 3, characterized in that, The method further includes: Delete the information of the foods in the second food set from the food storage database. Finally, the foods recorded in the food storage database are all the foods stored in the refrigerator after the refrigerator door is closed.

5. The method for improving the recognition rate of RFID tags according to claim 1, wherein: The radio frequency identification reading module is arranged on the central axis of the top of the refrigerator, and the central axis isolates the refrigerator door and the refrigerator back panel.

6. The method for improving RFID tag recognition rate according to claim 1, characterized in that, The method further includes: During the period when it is detected that the refrigerator door is opened, use the radio frequency identification reading module to detect all RFID tags within the recognition range, identify each RFID tag to obtain the information of the corresponding food, and continuously and uninterruptedly measure the signal intensity of each tag.

7. The method for improving RFID tag recognition rate according to claim 6, characterized in that, The method further includes: If A1 > A0 and A2 > A0 for a certain tag, it is determined that the food with the tag is moving inside the refrigerator.

8. An electronic device comprising a memory and a processor, the memory storing a computer program executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the method for improving the recognition rate of RFID tags according to any one of claims 1 - 7.

9. A refrigerator, characterized in that, The refrigerator includes the electronic device according to claim 8.

10. The refrigerator according to claim 9, characterized in that, It further includes a refrigerator door, a door opening and closing detection module, a radio frequency identification reading module, and an information processing module, where: The door opening and closing detection module is used to detect the opening and closing state of the refrigerator door; The radio frequency identification reading module is used to detect all RFID tags within the recognition range during the period when it is detected that the refrigerator door is opened, identify each RFID tag to obtain the information of the corresponding food, and continuously and uninterruptedly measure the signal intensity of each tag; The information processing module is used to obtain the continuous change interval of the signal strength of each RFID tag during the opening of the refrigerator door, so as to obtain the initial signal strength A1 and the final signal strength A2 of each tag. The continuous change interval is used to exclude the influence of non - continuous signal changes caused by food occlusion; and put the foods corresponding to all the tags with A1 < A0 and A2 > A0 into the first food set, where the first food set is all the foods put into the refrigerator from the outside during the opening of the refrigerator, A0 is the signal strength of the RFID tag at the preset position of the refrigerator door, and the continuous interval change satisfies that the absolute value of the difference between the signal strengths of two adjacent samplings is less than the preset value.

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