KR101204860B1 - Security system - Google Patents

Abstract

A security system is disclosed. A security system in accordance with embodiments of the present invention includes RFID tags, a host device, and an RFID reader. RFID tags are arranged to form two-dimensional planes at regular intervals from one side of the space to be monitored. The RFID reader communicates with RFID tags and transmits tag information including identification numbers and signal strengths of the RFID tags to a host device. The host device forms a frame matrix of the identification number of the RFID tags corresponding to the arrangement of the RFID tags, so that the host device forms the frame metrics of the signal strength from the RFID reader in the space to be monitored. Determine if an intruder appeared.

Description

Security system

The present invention relates to a security system, and more particularly, to a security system for determining whether an intrusion object appeared in the space to be monitored.

Security systems, which typically use surveillance cameras, are effective when the monitor can continue to watch live-view video from the camera. However, it is almost impossible for a watcher to watch live-view video from a camera.

Accordingly, the host device in the conventional surveillance system may determine whether an invading object appears in the surveillance target space by using an image processing technique. However, if the intruder secretly installs the same operation image as the photographed object in front of the camera, the host device in the surveillance system cannot determine whether the intruder appears in the surveillance object space by using an image processing technique.

Embodiments of the present invention provide a security system that does not require a watcher to continuously watch a camera video and prevents an intruder from sneaking an operation by accurately determining whether an intruder appears in a space to be monitored without using a camera. To provide.

According to one aspect of the present invention, a security system may be provided that includes RFID tags, a host device, and an RFID reader.

The RFID tags are arranged to form two-dimensional planes at regular intervals from one side of the space to be monitored.

The RFID reader communicates with the RFID tags and transmits tag information including identification numbers and signal strengths of the RFID tags to the host device.

The host device forms a frame metric of an identification number of the RFID tags corresponding to the arrangement of RFID tags, so that the host device forms a frame metric of the signal strength from the RFID reader. Accordingly, it is determined whether an invading object appears in the space to be monitored.

The host device may also store normal and reference initial cell values while periodically initializing the frame metrics, and record actual cell values of signal strength periodically received from the RFID reader in frame metrics. Thus, the difference values between the initial cell values and the actual cell values may be calculated in the frame matrix.

The host device may obtain the adjusted difference values by converting the difference values smaller than the set difference value to zero among the calculated difference values.

In addition, the host device may output an alarm signal by determining that an intrusion object appears in the surveillance target space when the cells having the difference values other than zero are continuous and have a larger area than the reference area.

In addition, the host device determines that an intrusion object appears in the space to be monitored when the cells having the difference values other than zero are continuous and larger than the reference area, and use the adjusted difference values as image data. Can be.

The host device may control the basic operation of the RFID reader whenever a periodic transfer time elapses.

In addition, when the host device controls the basic operation of the RFID reader, the host device transmits the power off signal, the change frequency signal, and the power on signal in order. Upon transmission to the RFID reader, the power of the transceiver of the RFID reader is turned off and the power of the transceiver of the RFID reader is changed after the modulation frequency of the RFID reader is changed. On.

Also, the time from when the host device transmits a power on signal to the RFID reader until the host device transmits a power off signal to the RFID reader. During the pass-through time, the RFID reader communicates with the RFID tags, and the RFID reader includes tag information including the identification number and signal strength of the RFID tags. Can be transmitted to the host device.

In addition, when the RFID reader communicates with the RFID tags, when the host device transmits a power-on signal to the RFID reader, the RFID reader ) As the reader transmits a power signal to the RFID tags, the RFID tags initialize and set a first target value, and the RFID reader sets a first target value in a query command. As the target value is transmitted to the RFID tags, the RFID tags having successfully communicated may convert the set target value from the first target value to the second target value.

In addition, the host device determines, during the transmission time of the current period, whether or not the intrusion object appeared in the monitored object space according to the cell values of the signal strength received from the RFID reader during the transmission time of the previous period. can do.

The RFID tags may further include RFID tags arranged to form two-dimensional planes at regular intervals on the side of the one surface of the space to be monitored, and the RFID reader may be further configured to display the RFID tags in odd-numbered periods. It may communicate with RFID tags on one side and with RFID tags on the side of the side in an even period.

According to embodiments of the present invention, a frame metric of an identification number of the RFID tags is formed corresponding to the arrangement of the RFID tags, so that the signal strength from the RFID reader is formed. It is determined whether an invading object appears in the space to be monitored according to the cell values of.

In other words, by accurately determining whether an intruded object appears in the monitoring target space without using a camera, the monitor does not have to continuously watch the camera video, and the intruder has no object to operate secretly.

1 is a diagram showing a security system of an embodiment of the present invention.
FIG. 2 is a diagram illustrating that normal and reference initial cell values are stored in a process of periodically initializing frame metrics in the host device of FIG. 1.
FIG. 3 is a diagram showing that in the host device of FIG. 1, actual cell values of signal strength periodically received from an RFID reader are recorded in a frame matrix.
FIG. 4 is a diagram illustrating difference values between initial cell values of FIG. 2 and actual cell values of FIG. 3 in a frame matrix in the host device of FIG. 1.
FIG. 5 is a diagram illustrating a difference value adjusted by converting a difference value smaller than a set difference value among the calculated difference values of FIG. 4 into zero in the host device of FIG. 1.
6 is a flowchart illustrating a unit cycle operation of the host device of FIG. 1.
FIG. 7 is a diagram for explaining the mutual communication operation between the RFID reader and the host device of FIG. 1.
8 is a diagram showing a security system of another embodiment of the present invention.

The following description and the annexed drawings are for understanding the operation according to the present invention, and a part that can be easily implemented by those skilled in the art may be omitted.

In addition, the specification and drawings are not provided to limit the invention, the scope of the invention should be defined by the claims. Terms used in the present specification should be interpreted as meanings and concepts corresponding to the technical spirit of the present invention so as to best express the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a security system of one embodiment of the present invention.

Referring to FIG. 1, the security system of an embodiment of the present invention includes RFID tags 11, T11 to Tmn, a host device 13, and an RFID reader 12.

The RFID tags 11 and T11 to Tmn are arranged to form two-dimensional planes at regular intervals on one surface 14 of the space to be monitored.

The RFID reader 12 communicates with the RFID tags 11, T11 through Tmn, and identifies the identification number and signal strength of the RFID tags 11, T11 through Tmn. Send the included tag information to the host device.

The host device 13 forms a frame matrix of the identification number of the RFID tags 11 and T11 to Tmn corresponding to the arrangement of the RFID tags 11 and T11 to Tmn. It is determined whether an invading object appears in the space to be monitored according to the cell values of the signal strength from the RFID reader 12.

Therefore, by accurately determining whether an intruded object appears in the monitoring target space without using a camera, the monitor does not have to keep watching the camera video and there is no object for the intruder to operate without a secret.

Operation related to the above is described in detail below with reference to FIGS.

FIG. 2 shows that in the host device 13 of FIG. 1, normal and reference initial cell values (RSSI: Received Sigal Strength Indicator) are stored in the process of periodically initializing the frame matrix 21.

1 and 2, each cell C11 to Cmn of the frame matrix 21 has an identification number (EPC: Electronic Product Code) corresponding to the arrangement of RFID tags 11 and T11 to Tmn. ) As an address.

In the process of periodically initializing the frame matrix 21, the host device 13 stores initial and reference initial cell values RSSI for each cell C11 to Cmn of the frame matrix 21. .

3, in the host device 13 of FIG. 1, actual cell values (RSSI: Received Sigal Strength Indicator) of signal strength periodically received from an RFID reader 12 are recorded in the frame matrix 31. Shows.

1 and 3, each cell C11 to Cmn of the frame matrix 31 has an identification number (EPC: Electronic Product Code) corresponding to the arrangement of RFID tags 11 and T11 to Tmn. ) As an address.

The host device 13 receives the actual cell values (RSSI: Received Sigal Strength Indicator) of the signal strength periodically received from the RFID reader 12, and each cell C11 to Cmn of the frame matrix 31. To record.

FIG. 4 shows the difference values DI between the initial cell values RSSI of FIG. 2 and the actual cell values RSSI of FIG. 3 in the frame matrix 41 in the host device 13 of FIG. 1.

2 to 4, the host device 13 calculates the difference values DI between the initial cell values RSSI of FIG. 2 and the actual cell values RSSI of FIG. 3 in the frame matrix 41. Obtain

5, in the host device 13 of FIG. 1, difference values smaller than the set difference value among the calculated difference values DI of FIG. 4 are converted into zeros to adjust the adjusted difference values AR. Shows.

4 and 5, the host device 13 converts a difference value smaller than a set difference value, for example, less than 10 milli-decibels dBm among the calculated difference values DI of FIG. 4 to zero. The adjusted difference values AR are obtained. Cells marked with bold boxes in FIG. 5 have difference values that are equal to or greater than the set difference value.

Accordingly, when the cells of non-zero difference values, that is, cells marked with bold boxes in FIG. 5, are continuous and have a larger area than the reference area, the host device 13 determines that an invading object appears in the monitored space. To output the alarm signal.

6 illustrates a unit cycle operation of the host device 13 of FIG. 1.

FIG. 7 is a diagram for explaining the mutual communication operation between the RFID reader 12 and the host device 13 of FIG. 1.

Referring to FIGS. 1, 6, and 7, the unit cycle operation of the host device 13 and the communication between the RFID reader 12 and the host device 13 will be described below.

The host device 13 controls the basic operation of the RFID reader 12 whenever the periodic transfer times t1 to t2 and t2 to t3 elapse (steps S607 to S613).

When the host device 13 controls the basic operation of the RFID reader 12, the host device 13 sequentially turns on the power off signal, the change frequency signal, and the power on signal. According to the transmission to the RFID reader (steps S607 to S613), the power supply of the transceiver of the RFID reader 12 is turned off and the modulation frequency of the RFID reader 12 is turned off. After is changed, the power of the transceiver of the RFID reader 12 is turned on.

The host device 13 receives the power-off signal from the time points t1, t2, and t3 when the host device 13 transmits a power-on signal to the RFID reader (step S613). Transfer time (t1 to t2, t2 to t3) which is the time until the time of transmission (step S609) to the (RFID) reader (t1, t2, t3, the operation time of steps S609 to S613 will not be considered) RFID reader 12 communicates with RFID tags 11, and RFID reader 12 identifies the identification number of RFID tags 11, and the < RTI ID = 0.0 > RFID < / RTI > The tag information including the EPC (Electronic Product Code) and the signal strength (RSSI: Received Sigal Strength Indicator) is transmitted to the host device 13.

In FIG. 7, reference numeral 71 denotes an RFID among the RFID tags 12 in which the RFID reader 12 performs the RFID during the transfer time t1 to t2 and t2 to t3. ) Indicates the time to communicate with the tag.

When the RFID reader 12 communicates with the RFID tags 11, the host device 13 transmits a power-on signal to the RFID reader 12. And as the RFID reader 12 transmits a power signal to the RFID tags 11, the RFID tags 11 initialize and the first target value (“A”). ), And as the RFID reader 12 sends the first target value "A" to the RFID tags in the query command, the successful RFID tag They convert the set target value from the first target value "A" to the second target value "B".

As a result, communication conflicts between multiple RFID tags 11 for one RFID reader 12 may be reduced.

On the other hand, the host device 13, according to the cell values (RSSI) of the signal strength received from the RFID reader 12 during the transfer time of the previous period, for example, t1 ~ t2 time, to the monitored object space. It is determined during the propagation time of the current cycle, for example, t2 to t3 time (step S617 to step S625) whether the invading object appeared.

1, 6, and 7, the unit cycle operation of the host device 13 will be described in order as follows.

First, the host device 13 initializes the frame matrix (see FIG. 2) (step S601).

Next, when tag information is received from the RFID reader 12, the host device 13 records the actual cell values in the frame matrix (see Fig. 3) (step S603 and step S605).

Next, when the transfer time t1 to t2 and t2 to t3 have elapsed, the host device 13 performs the RF ID on the power off signal, the change frequency signal, and the power on signal in order. To the (RFID) reader 12 (steps S607 to S613).

Accordingly, the power of the transceiver of the RFID reader 12 is turned off and the power of the transceiver of the RFID reader 12 is turned off after the modulation frequency of the RFID reader 12 is changed. On.

Next, if the number of tags read is not larger than the set reference number, the communication error is likely to occur, so that the host apparatus 13 performs the above step S601 and subsequent steps again (step S615).

If the number of tags read out is larger than the set reference number (step S615), the host device 13 performs steps S617 to S625, so that the RFID is transmitted during the transfer time of the previous cycle, for example, t1 to t2 hours. In accordance with the cell values RSSI of the signal strength received from the reader 12, it is determined whether an invading object appears in the space to be monitored during a transmission time of a current period, for example, t2 to t3 time.

In step S617, actual cell values (RSSI in FIG. 3) are replaced with initial cell values for tags that are not read. Therefore, the unread tags are not converted to zero in the following step S621, which helps in determining the continuity in the following step S623.

In step S619, the host device 13 determines the difference values (DI in FIG. 4) between the initial cell values RSSI of FIG. 2 and the actual cell values RSSI of FIG. 3 in the frame matrix 41 of FIG. 4. Calculate and get

In operation S621, the host device 13 converts a difference value smaller than a set difference value, for example, less than 10 milli-decibels dBm among the calculated difference values DI of FIG. 4 to zero and adjusts the difference. Get the values (AR of FIG. 5).

In steps S623 to S625, the host device 13 invades the space to be monitored if cells of nonzero differences, that is, cells marked with bold boxes in FIG. It is determined that the object appeared, outputs an alarm signal, and uses the adjusted difference values (AR of FIG. 5) as image data.

As the difference values (AR in FIG. 5) adjusted in step S624 are used as image data, not only the shape of the invading object can be displayed, but also a well-known face recognition and object tracking technique of a moving image can be applied.

All steps of FIG. 6 are repeatedly performed.

8 shows a security system of another embodiment of the present invention.

Referring to FIG. 8, a security system according to another embodiment of the present invention includes a first RFID tags 81 and T11 to Tmn, a second RFID tags 86 and T11 to Tmn, and a host. Device 83, and an RFID reader 82.

The first RFID tags 11 and T11 to Tmn are arranged to form two-dimensional planes at regular intervals on one surface 84 of the space to be monitored.

The second RFID tags 86, T11 to Tmn are arranged to form two-dimensional planes at regular intervals from each other on the side 85 of the one side 84 of the space to be monitored.

The RFID reader 82 communicates with the first RFID tags 81, T11 to Tmn on the one surface 84 in an odd numbered period, so as to communicate with the first RFID tag. Tag information including the identification numbers and signal strengths of the fields 81 and T11 to Tmn is transmitted to the host device 83.

In addition, the RFID reader 82 communicates with the second RFID tags 86 (T11 to Tmn) of the side surface 85 of the one surface 84 in an even-numbered period. 2 Tag information including the identification number and signal strength of the RFID tags 86 (T11 to Tmn) is transmitted to the host device 83.

The host device 83 may determine the frame metrics of the identification number of the first RFID tags 81, T11 through Tmn, corresponding to the arrangement of the first RFID tags 81, T11 through Tmn. And form a frame matrix of an identification number of the second RFID tags 86 (T11 to Tmn) corresponding to the arrangement of the second RFID tags 86 (T11 to Tmn). In accordance with the cell values of the signal strength from the RFID reader 82, it is determined whether an invasive object appears in the space to be monitored.

Therefore, since it has a monitoring direction added to the embodiment of FIG. 1, more three-dimensional monitoring is possible. In addition, the detailed operation is as described with reference to FIGS. 2 to 7 in the embodiment of FIG.

As described above, according to embodiments according to the present invention, a frame matrix of an identification number of RFID tags is formed corresponding to an arrangement of RFID tags, and thus, from an RFID reader. It is determined whether an invading object appears in the space to be monitored according to the cell values of the signal strength of.

In other words, by accurately determining whether an intruded object appears in the monitoring target space without using a camera, the monitor does not have to continuously watch the camera video, and the intruder has no object to operate secretly.

The present invention has been described above with reference to preferred embodiments. It will be understood by those skilled in the art that the present invention may be embodied in various other forms without departing from the spirit or essential characteristics thereof. Therefore, the above-described embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and the inventions claimed by the claims and the inventions equivalent to the claimed invention are to be construed as being included in the present invention.

It can be used not only for invading objects but also for other monitoring objects.

11 ... RFID tags, 12 ... RFID reader,
13 ... host device, 14 ... one side of the space to be monitored,
81 ... RFID tags, 86 ... RFID tags,
82 ... RFID reader, 83 ... host device,
84 ... one side of the monitored space, 85 ... one side of the monitored space.

Claims (11)

RFID tags arranged to form two-dimensional planes at regular intervals from one side of the space to be monitored;
A host device; And
An RFID reader which communicates with the RFID tags and transmits tag information including identification numbers and signal strengths of the RFID tags to the host device;
The host device,
Forming a frame matrix of an identification number of the RFID tags corresponding to the RFID tags, and according to the cell values of the signal strength from the RFID reader. A security system for determining whether an intrusion object appeared in the, and controls the basic operation of the RFID reader every time a periodic transfer time elapses. The method of claim 1, wherein the host device,
Initially storing the normal and reference initial cell values while periodically initializing the frame matrix, and recording the actual cell values of the signal strength periodically received from the RFID reader in the frame matrix, thereby initial cell in the frame matrix. A security system that calculates differences between values and actual cell values. The method of claim 2, wherein the host device,
A security system for calculating adjusted difference values by converting the difference values smaller than a set difference value among the calculated difference values to zero. Claim 4 has been abandoned due to the setting registration fee. The method of claim 3, wherein the host device,
And outputting an alarm signal when it is determined that an intruded object appears in the space to be monitored, when cells of difference values excluding zero are continuous and larger than a reference area. The method of claim 3, wherein the host device,
And if the cells of the difference values excluding zero are continuous and have an area larger than the reference area, determine that an invading object appears in the space to be monitored, and use the adjusted difference values as image data. delete The method of claim 1, wherein the host device controls the basic operation of the RFID reader.
As the host device transmits a power off signal, a change frequency signal, and a power on signal to the RFID reader in order,
And a power supply of the transceiver of the RFID reader is turned off after the power of the transceiver of the RFID reader is turned off and the modulation frequency of the RFID reader is changed. Claim 8 was abandoned when the registration fee was paid. The method of claim 7, wherein
Transfer time from the time when the host device transmits a power on signal to the RFID reader to the time when the host device transmits a power off signal to the RFID reader During time, the RFID reader communicates with the RFID tags, and the RFID reader reads tag information including the identification number and signal strength of the RFID tags. Security system to send to the host device. Claim 9 has been abandoned due to the setting registration fee. The RFID system of claim 8, wherein the RFID reader is in communication with the RFID tags.
When the host device transmits a power-on signal to the RFID reader, the RFID reader transmits a power signal to the RFID tags. RFID) tags initialize and set a first target value,
As the RFID reader transmits a first target value to the RFID tags in the query command, the RFID tags having successfully communicated set a target value from the first target value to the second target value. Security system that converts to the target value. Claim 10 has been abandoned due to the setting registration fee. The method of claim 8, wherein the host device,
And according to the cell values of the signal strength received from the RFID reader during the propagation time of the previous period, during the propagation time of the current cycle whether an intruder appeared in the monitored space. The method of claim 1,
Further, RFID tags (RFID) tags are arranged to form two-dimensional planes at regular intervals from the side of the one surface of the space to be monitored,
The RFID reader communicates with the RFID tags of the one face in odd-numbered periods and the RFID tags of the sides of the face in even-numbered periods. .

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