CN109376820A - Books based on RFID technique are accurately positioned sort method - Google Patents
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- CN109376820A CN109376820A CN201811301400.0A CN201811301400A CN109376820A CN 109376820 A CN109376820 A CN 109376820A CN 201811301400 A CN201811301400 A CN 201811301400A CN 109376820 A CN109376820 A CN 109376820A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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Abstract
The present invention discloses a kind of books automatic and accurate positioning sorting method based on RFID technique, reads the RSSI value of book labels using RFID technique to realize automatic and accurate positioning sorting to each layer of books on library bookshelf.Identify the information data of book RFID tag, library book sequence is carried out based on RSSI value, using the method for seeking bimodal function the lowest point extreme value, specific location and sequence of the every books on one layer of bookshelf are obtained, librarian and reader is allowed quickly to find books.The each layer of books made an inventory are ranked up, so as to accurately orient the position where carrying out each books, help reader to borrow.
Description
Technical field
The invention belongs to technical field of RFID more particularly to a kind of library books based on RFID tag RSSI signal value
Accurate positioning sort method.
Background technique
Electric product coding (Electronic Product Code, EPC) new technology based on RFID technique, passes through electricity
Magnetic coupling mode realizes non-contact acquisition target object data, gives the links band such as the identification of commodity, storage, flowing, sale
Huge change is carried out, huge effect has also been played especially in taking care of books.
Currently, most libraries use bar code system, existing bar code can only be stored on a small quantity without coding
Fixed data, while needing manual operation, which greatly limits bar code applications range and service efficiencies.With RFID technique
Maturation and sticker price reduction, RFID technique also start library field carry out using, be library book management
It brings great convenience, such as books locating query, fast self-help, which is borrowed, also etc. to be started to serve reader.Wherein books position
Query function is quickly read the RSSI signal in book labels, RSSI signal is handled and calculated by RFID technique,
Obtain books putting in order on the shelf.
Since book labels are large number of, distance is again very close to after reader sends signal, from different labels
Phenomena such as answer signal can be interfered with each other and be collided, and be competed with one another for, and finally will appear skip during reading and writing data.Therefore it needs
Processing and interpolation are carried out to skip data.
Summary of the invention
In view of the above technical problems, the purpose of the present invention is overcoming the deficiencies in the prior art, one kind is provided and is based on
The books automatic and accurate positioning sorting method of RFID technique reads the RSSI value of book labels using RFID technique come to library
Each layer of books on bookshelf realize automatic and accurate positioning sorting.
In order to achieve the above objectives, the technical solution adopted by the present invention are as follows: the books of the invention based on RFID technique are accurate
Positioning sorting method identifies the information data of book RFID tag, based on RSSI value carry out library book sequence, RSSI value with
The function of time is a bimodal function, using the method for seeking bimodal function the lowest point extreme value, obtains every books in one layer of bookshelf
On specific location and sequence, allow librarian and reader quickly to find books.To each layer of books made an inventory
It is ranked up, so as to accurately orient the position where carrying out each books, helps reader to borrow.
The following steps are included:
Step 1, the bookshelf s and level number c that the bookshelf where needing positioning sorting is read using RFID device；
RFID device is moved to the other side from the side of bookshelf by step 2, reads and record the letter of RFID tag in books
Cease data；
Step 3 handles collected RSSI data；
Step 4 draws the book labels RSSI value r curve that t changes at any time, finds out book labels RSSI value r t at any time
The rule of variation；
Step 5, find out book labels RSSI value r at any time t variation curve it is bimodal between the corresponding anchor point in the lowest point
T, i.e. time value sort from small to large ord to the anchor point T of every books, obtain putting in order for books forward direction.
Further, the information data of RFID tag in books, including No. EPC, RSSI value r are read and recorded in step 2
With the time t for reading data.
Further, collected RSSI data are handled in step 3, including rejects interference data, interpolation skip
Data.
Further, after rejecting interference data, judge either with or without skip data, when adjacent point-to-point transmission is every greater than given threshold
When, interpolation is carried out to curve.Specifically comprise the following steps:
Step 3.1 sets and needs the region of interpolation as point P1(ti, ri) and point P2(tj, rj) between region, the region left side select
Take point P0(ti-1, ri-1), the selected point P on the right of region3(tj+1, rj+1), seek straight line P0P1With P2P3Intersection point P；
Step 3.2, with point P1、P、P2Carry out Bezier curve fitting.
Further, positioning sorting is carried out to books, included the following steps:
Book labels RSSI value r is drawn with the curve for the time t variation for reading data；
The maximum region of recessed area is found out as the lowest point in the lowest point part for finding out the RSSI change curve of book labels
Region, then find out the anchor point T of the minimum point as books in the lowest point region.Specifically comprise the following steps:
Step 5.1 sets RSSI curve and is made of n point, and i-th coordinate is (ti, ri), tiFor time, riFor RSSI
Value, functional expression are as follows: ri=f (ti), i=1...n.
Step 5.2 enables
That is SiIt is r=f (t) and r=a and t=tiThe region area surrounded, a are the RSSI value of RSSI curve minimum point；
That is MiIt is r=f (t) and r=riThe region area surrounded, i are the serial number of the left end point of peak valley, IiFor the right side of peak valley
The serial number of endpoint is greater than 0 when curve is recessed, is equivalent to the capacity of recess the lowest point, less than 0 when convex, is equivalent to convex
There is no capacity；
Step 5.3 is askedMaximum the lowest point region is asked, m is that capacity is maximum
The lowest point left end point serial number, n be its corresponding right endpoint serial number；
Step 5.4 is askedThe RSSI value of the minimum point in maximum the lowest point region is sought, k is
Its corresponding serial number, T are its corresponding time.
Further, it further includes following steps that the above-mentioned books based on RFID technique, which are accurately positioned sort method:
Step 6 moves backward RFID device from bookshelf, and by the method for 2~step 5 of above-mentioned steps, it is reverse to obtain books
Put in order；
Step 7, books forward direction, which puts in order, and inversely puts in order carries out fusion merging, obtains the final arrangement of books
Sequentially.
Further, the fusion that puts in order of books is merged, the specific method is as follows:
Step 7.1, by converse sequencing inverted order；
Step 7.2, same books take the biggish row of greatest rssi value in sequence difference positive, in converse sequencing
Serial number；If greatest rssi value is also identical, the scanned biggish sequence number of numerical value is taken；Sequence number in left and right sequence is identical；Row
Serial number is constant；
Step 7.3 exists in forward direction sequence, and in converse sequencing skip books, or exist in converse sequencing, and
The books of skip in forward direction sequence, increase the books of skip in the sequence of skip, and sequence number is constant；
When step 7.4, greatest rssi value are less than given threshold, the books are directly deleted；
Further, the above-mentioned books based on RFID technique are accurately positioned in sort method, and RFID device movement speed is not
More than 0.2 meter per second.
Further, the above-mentioned books based on RFID technique are accurately positioned in sort method, the antenna parallel of RFID device
It is placed on the position not far apart from books, the distance of antenna distance books is set as 0~5cm.
The invention has the following advantages: books of the invention, which are accurately positioned sort method, is based on RSSI value progress books
The sequence of shop books, obtains exact position and sequence of the every books on one layer of bookshelf, so that librarian and reader can be with
Books quickly are found, while also reducing skip rate.The each layer of books made an inventory are ranked up, so as to accurately fixed
Position comes out the position where each books, helps reader to borrow.It highly shortened reader and search books in library
The time it takes improves the utilization rate of books and the efficiency of taking care of books.
Detailed description of the invention
Fig. 1 is that the books of the embodiment of the present invention are accurately positioned sort method flow chart.
Fig. 2 is the curve that the RSSI that the single label of scanning of the embodiment of the present invention obtains is changed over time.
The curve that the RSSI of skip phenomenon is changed over time occurs when Fig. 3 is 3 labels of scanning of the embodiment of the present invention.
The curve that the RSSI of skip phenomenon is changed over time occurs when Fig. 4 is 20 labels of scanning of the embodiment of the present invention.
Fig. 5 is that the RSSI curve to skip of the embodiment of the present invention carries out the curve that interpolation obtains.
Fig. 6 is that the RFID device of the embodiment of the present invention scans the process schematic of bookshelf books.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further below with reference to embodiment and attached drawing
It is bright.
As shown in Figure 1, the books of the present invention based on RFID technique are accurately positioned sort method comprising following step
It is rapid:
Step 1, the bookshelf s and level number c that the bookshelf where needing positioning sorting is read using RFID device；
RFID device is moved on the right of bookshelf by step 2 from the left side of bookshelf, and speed is no more than 0.2 meter per second, reads simultaneously
Record the information data of RFID tag in books, including No. EPC, RSSI value r and the time t for reading data；
Step 3 handles collected RSSI data, rejects interference data, interpolation skip data；
Step 4, draw every book labels RSSI value r at any time t variation curve, find out book labels RSSI value r with
The rule of time t variation；
Step 5, find out every book labels RSSI value r at any time t variation curve it is bimodal between the lowest point it is corresponding when
Between T sort from small to large ord to the time T of every books, obtain books putting in order from left to right；
RFID device is moved to the bookshelf left side by step 6 on the right of bookshelf, by the method for 2~step 5 of above-mentioned steps,
Obtain books putting in order from right to left；
Step 7, by books from left to right put in order and putting in order from right to left carries out fusion merging, obtain figure
Book is final to put in order.
A specific embodiment of the invention is illustrated below in conjunction with Fig. 2~Fig. 6.
RFID reader emits electromagnetic wave by antenna, reflection electromagnetic wave is received, to identify RFID tag.Reflection receivable arrives
Electromagnetic wave signal intensity RSSI (Received Signal Strength Indication) value with day line-spacing label distance
And change, the present embodiment uses Impinj R220 reader and IPJ-A0303 antenna, and the present invention has found according to experiment, RSSI value
As shown in Figure 2 with distance change rule: when antenna is close or when leaving label with certain speed (less than 0.2 meter per second),
RSSI value can be converted into RSSI value with Time Change with distance change rule.Abscissa indicates to read label in Fig. 2
Time, ordinate indicate label return RSSI signal value.Antenna from a distance close to label when, RSSI value starts from minimum value
It is incremented by, when antenna edge reaches above label, RSSI value starts to successively decrease, when center of antenna reaches right above label, RSSI
Value starts to be incremented by again, then increases with antenna from tag distances, and RSSI value starts to successively decrease again, until disappearing.RSSI value with
Time Change is a bimodal curve, it is bimodal between the lowest point at the time of be that center of antenna is reached right above label, i.e. day
Line and the nearest position of label, the position of label is positioned with this.
In library's scene, since books are large number of, antenna can scan more book labels simultaneously.Different labels
Between can interfere with each other and collide, compete with one another for, each label can only obtain a small amount of chance to respond reader, finally in data
Meeting skip during read-write, the sample of signal of each label may be very sparse.This sparse sampling makes the RSSI curve only to include
A small amount of a part, many useful data will be dropped, these can all reduce positioning accuracy, thus need to skip data into
Row processing and interpolation.As curve in the lowest point position skip occurs in Fig. 3, it appears it is relatively flat, it carries out after curve data interpolation such as
Shown in Fig. 5, the lowest point position positioning books acquired in this way are with regard to more accurate.
When being ranked up to one layer of books of library bookshelf, antenna parallel is placed on to the position not far apart from books
It sets, otherwise change over time for a book will not be very big for RSSI signal value, in the present embodiment antenna distance books
Distance is set as 5cm.During scanning books, antenna is slowly moved to the other side of bookshelf from the side of bookshelf, such as
Shown in Fig. 6.
By experiment, RSSI value with distance change rule as shown in Fig. 2, antenna from a distance close to label when, RSSI value
First it is incremented by, then successively decreases, when center of antenna reaches right above label, RSSI value starts to be incremented by again, then as antenna is from mark
Label distance increases, and RSSI value is successively decreased again, until disappearing.RSSI value is a bimodal curve with Time Change, it is bimodal it
Between the lowest point be antenna and the nearest position of label, the position of label is positioned with this.
After scanning through one layer of books, positioning sorting can be carried out to this layer of books, detailed process is as follows:
1, the RSSI change curve of every book labels is drawn, as shown in Figure 3, Figure 4；
2, the lowest point part of the RSSI change curve of each book labels is found out, the present embodiment is calculated using " watershed "
Method finds out the maximum region of recessed area as the lowest point region, then finds out the anchor point of the minimum point as books in the lowest point region
T.The specific method is as follows:
2.1, it sets RSSI curve to be made of n point, i-th coordinate is (ti, ri), tiFor time, riFor RSSI value, letter
Numerical expression are as follows: ri=f (ti), i=1...n.
2.2, it enables
That is SiIt is r=f (t) and r=a and t=tiThe region area surrounded, a are the RSSI value of RSSI curve minimum point；
That is MiIt is r=f (t) and r=riThe region area surrounded, i are the serial number of the left end point of peak valley, IiFor the right side of peak valley
The serial number of endpoint is greater than 0 when curve is recessed, is equivalent to the capacity of recess the lowest point, less than 0 when convex, is equivalent to convex
There is no capacity；
2.3, it asksMaximum the lowest point region is asked, k is the maximum paddy of capacity
The left end point serial number at bottom, n are its corresponding right endpoint serial number；
2.4, it asksThe RSSI value of the minimum point in maximum the lowest point region is sought, k is right for its
The serial number answered, T are its corresponding time；
3, when antenna scans arrive more book labels simultaneously, it can interfere with each other and collide between different labels, it is competing mutually
It strives, skip is finally understood during reading and writing data, many useful data will be dropped, and reduce positioning accuracy, therefore need pair
Skip data carry out processing and interpolation.As curve in the lowest point position skip occurs in Fig. 3, it appears it is relatively flat, carry out curve number
Books are positioned with regard to more accurate according to after the interpolation as shown in figure 5, the lowest point position acquired in this way.
After label data acquisition, to judge either with or without skip data.Under normal circumstances, the adjacent point-to-point transmission of curve is every will not be too
Greatly, when adjacent point-to-point transmission is when being greater than some threshold value, need to just interpolation be carried out to curve, specific interpolating method is as follows:
3.1, setting needs the region of interpolation as point P1(ti, ri) and point P2(tj, rj) between region, in region left side selected point
P0(ti-1, ri-1), the selected point P on the right of region3(tj+1, rj+1), seek straight line P0P1With P2P3Intersection point P；
3.2, with point P1、P、P2Carry out Bezier curve fitting；
4, the corresponding time T in every book labels the lowest point position is choseni.To obtained T1、T2、T3...TnAccording to from it is small to
Big sequence is ranked up, this sequence is exactly the sequence of positions of the books where label.
5, the fusion of left and right sequence merges, and the specific method is as follows:
5.1, by right sequence inverted order；
5.2, sequence difference of the same books in left and right sequence takes the biggish sequence number of greatest rssi value；If most
Big RSSI value is also identical, takes the scanned biggish sequence number of numerical value；Sequence number in left and right sequence is identical；Sequence number is constant；
5.3, exist in left bank sequence, and in right sequence skip books, or exist in the sequence of left and right, and leaked in left bank sequence
The books of reading, increase the books of skip in the sequence of skip, and sequence number is constant；
5.4, when greatest rssi value is less than some threshold value, the books are directly deleted；
The present invention provides the books positioning sorting method based on RFID tag RSSI signal value, positioning accuracy is high.Specifically
Realize that there are many method and the approach of the technical solution, the above is only a preferred embodiment of the present invention, it is noted that for
For those skilled in the art, without departing from the principle of the present invention, can also make it is several improvement and
Retouching, these modifications and embellishments should also be considered as the scope of protection of the present invention.Each component part being not known in the present embodiment
It is realized with the prior art.
Claims (12)
1. the books based on RFID technique are accurately positioned sort method, it is characterised in that:
It identifies the information data of book RFID tag, is based on RSSI value, library book sequence is carried out, using asking bimodal function paddy
Sole value obtains specific location and sequence of the every books on one layer of bookshelf.
2. books according to claim 1 based on RFID technique are accurately positioned sort method, which is characterized in that including with
Lower step:
Step 1, the bookshelf s and level number c that the bookshelf where needing positioning sorting is read using RFID device；
RFID device is moved to the other side from the side of bookshelf by step 2, reads and record the Information Number of RFID tag in books
According to；
Step 3 handles collected RSSI data；
Step 4 draws the book labels RSSI value r curve that t changes at any time；
Step 5, find out book labels RSSI value r at any time t variation curve it is bimodal between the corresponding anchor point T in the lowest point, it is right
The anchor point T of every books, sorts from small to large ord, obtains putting in order for books forward direction.
3. the books according to claim 2 based on RFID technique are accurately positioned sort method, it is characterised in that:
Read and record the information data of RFID tag in books, including No. EPC in step 2, RSSI value r and read data when
Between t.
4. the books according to claim 2 based on RFID technique are accurately positioned sort method, it is characterised in that:
Collected RSSI data are handled in step 3, including reject interference data, interpolation skip data.
5. the books according to claim 2 based on RFID technique are accurately positioned sort method, it is characterised in that:
After rejecting interference data, judge either with or without skip data, when adjacent point-to-point transmission is when being greater than given threshold, to curve progress
Interpolation.
6. the books according to claim 5 based on RFID technique are accurately positioned sort method, which is characterized in that specific packet
Include following steps:
Step 3.1 sets and needs the region of interpolation as point P1(ti, ri) and point P2(tj, rj) between region, in region left side selected point
P0(ti-1, ri-1), the selected point P on the right of region3(tj+1, rj+1), seek straight line P0P1With P2P3Intersection point P；
Step 3.2, with point P1、P、P2Carry out Bezier curve fitting.
7. being accurately positioned sort method according to the books based on RFID technique any in claim 2-6, feature exists
In, to books carry out positioning sorting, include the following steps:
Book labels RSSI value r is drawn with the curve for the time t variation for reading data；
The maximum region of recessed area is found out as the lowest point area in the lowest point part for finding out the RSSI change curve of book labels
Domain, then find out the anchor point T of the minimum point as books in the lowest point region.
8. the books according to claim 7 based on RFID technique are accurately positioned sort method, which is characterized in that specific packet
Include following steps:
Step 5.1 sets RSSI curve and is made of n point, and i-th coordinate is (ti, ri), tiFor time, riFor RSSI value, function
Formula are as follows: ri=f (ti), i=1...n.
Step 5.2 enables
That is SiIt is r=f (t) and r=a and t=tiThe region area surrounded, a are the RSSI value of RSSI curve minimum point；
That is MiIt is r=f (t) and r=riThe region area surrounded, i are the serial number of the left end point of peak valley, IiFor the right endpoint of peak valley
Serial number, when curve is recessed be greater than 0, be equivalent to the capacity of recess the lowest point, less than 0 when convex, being equivalent to convex does not have
Capacity；
Step 5.3 is askedMaximum the lowest point region is asked, m is the maximum paddy of capacity
The left end point serial number at bottom, n are its corresponding right endpoint serial number；
Step 5.4 is askedThe RSSI value of the minimum point in maximum the lowest point region is sought, k is right for its
The serial number answered, T are its corresponding time.
9. being accurately positioned sort method according to the books based on RFID technique any in claim 2-6, feature exists
In further including following steps:
Step 6 moves backward RFID device from bookshelf, by the method for 2~step 5 of above-mentioned steps, obtains the reverse row of books
Column sequence；
Step 7, books forward direction, which puts in order, and inversely puts in order carries out fusion merging, and it is suitable to obtain the final arrangement of books
Sequence.
10. the books according to claim 9 based on RFID technique are accurately positioned sort method, it is characterised in that:
The fusion that puts in order of books merges, and the specific method is as follows:
Step 7.1, by converse sequencing inverted order；
Step 7.2, same books take the biggish sequence number of greatest rssi value in sequence difference positive, in converse sequencing；
If greatest rssi value is also identical, the scanned biggish sequence number of numerical value is taken；Sequence number in left and right sequence is identical；Sequence number
It is constant；
Step 7.3 exists in forward direction sequence, and in converse sequencing skip books, or exist in converse sequencing, and positive
The books of skip in sequence, increase the books of skip in the sequence of skip, and sequence number is constant；
When step 7.4, greatest rssi value are less than given threshold, the books are directly deleted.
11. the books according to claim 2 based on RFID technique are accurately positioned sort method, it is characterised in that:
RFID device movement speed is no more than 0.2 meter per second.
12. the books according to claim 2 based on RFID technique are accurately positioned sort method, it is characterised in that:
The antenna parallel of RFID device is placed on the position not far apart from books, and the distance of antenna distance books is set as 0~
5cm。
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| CN201811301400.0A CN109376820A (en) | 2018-11-02 | 2018-11-02 | Books based on RFID technique are accurately positioned sort method |
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| CN201811301400.0A CN109376820A (en) | 2018-11-02 | 2018-11-02 | Books based on RFID technique are accurately positioned sort method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110399756A (en) * | 2019-07-23 | 2019-11-01 | 深圳市琥玟科技有限公司 | A kind of method and system using article in RFID identification adjacent container |
| CN110954864A (en) * | 2019-12-05 | 2020-04-03 | 上海威瞳视觉技术有限公司 | Positioning method based on RFID technology |
| CN113033731A (en) * | 2021-03-09 | 2021-06-25 | 深圳市海恒智能技术有限公司 | Book sorting method, system and medium based on radio frequency identification technology |
| CN113033730A (en) * | 2021-03-09 | 2021-06-25 | 深圳市海恒智能技术有限公司 | Book positioning method, system and medium based on radio frequency identification technology |
| CN117422079A (en) * | 2023-10-18 | 2024-01-19 | 上海阿法迪智能数字科技股份有限公司 | Book checking method and system based on checking robot |
-
2018
- 2018-11-02 CN CN201811301400.0A patent/CN109376820A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110399756A (en) * | 2019-07-23 | 2019-11-01 | 深圳市琥玟科技有限公司 | A kind of method and system using article in RFID identification adjacent container |
| CN110954864A (en) * | 2019-12-05 | 2020-04-03 | 上海威瞳视觉技术有限公司 | Positioning method based on RFID technology |
| CN110954864B (en) * | 2019-12-05 | 2024-02-27 | 上海威瞳视觉技术有限公司 | Positioning method based on RFID technology |
| CN113033731A (en) * | 2021-03-09 | 2021-06-25 | 深圳市海恒智能技术有限公司 | Book sorting method, system and medium based on radio frequency identification technology |
| CN113033730A (en) * | 2021-03-09 | 2021-06-25 | 深圳市海恒智能技术有限公司 | Book positioning method, system and medium based on radio frequency identification technology |
| CN117422079A (en) * | 2023-10-18 | 2024-01-19 | 上海阿法迪智能数字科技股份有限公司 | Book checking method and system based on checking robot |
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Application publication date: 20190222 |