KR101961817B1 - Method for recognizing tags for playing equipment - Google Patents

Abstract

The present invention relates to a method to recognize a tag for playing equipment. According to the present invention, the method to recognize a tag for playing equipment comprises: a step of allowing a wireless terminal held by a user (kid) to tag a tag installed in a tagging apparatus disposed in a playing space; a step of allowing an application embedded in the wireless terminal to recognize an end part (point) of a plurality of tags in accordance with tagging and extract a coordinate value of each of a plurality of points; a step of allowing the application to use the coordinate value of the plurality of points to estimate a tag ID corresponding to a tag pattern formed by the plurality of points; and a step of allowing the application to verify whether the estimated tag is correct to finally fix the tag ID. Accordingly, when a tag is recognized by a wireless terminal, the tag is recognized in consideration of a distance among the plurality of (three) tags, the area of a triangle formed by the three tags, and an installation direction or angle of the tag based on the coordinate value of the tags, thereby increasing the number of tag patterns and improving recognition correctness of the tag.

Description

[0001] The present invention relates to a method for recognizing a tag for a playground apparatus,

The present invention relates to a tag recognition method for a riding device, and more particularly, to a tag recognition method using a wireless terminal, in which a distance between a plurality of points using coordinate values of a plurality of points of a tag, And more particularly, to a recognition method for a tag for a riding device that can increase the number of tag patterns and improve tag recognition accuracy by recognizing the tag in consideration of the area of the polygon formed by the point, the installation direction of the tag, or the tagging angle .

With the remarkable development of IT technology in recent years, smart phones have been undergoing a change and everyday life. In addition, the input / output means requires more intuitive and quick response characteristics in accordance with the widespread use and frequent use of such smart phones, and as a countermeasure thereto, the smart phone has a capacitive touch input unit. The electrostatic touch provides a precise touch input by finger touch using the static electricity accumulated in the human body without lowering the image quality as compared with the conventional pressure sensitive type touch.

Particularly, a capacitive touch input unit mounted on a user's wireless terminal including a smart phone supports a finger touch-based multi-touch. The multi-touch technology recognizes two or more touch points at a specific point in time, and provides various intuitive input functions on the basis of sequential multi-touch according to the designated order, change in the interval of the touch points in the multi-touched state, movement trajectory or the like.

The conventional multi-touch method operates on the basis of the finger touch of the user, and thus is used only for the intuitive input function of the user, but can not be applied to other applications.

On the other hand, parents of our country have a very high education level for their children, but unfortunately the result-oriented education has progressed, and despite the high cost structure that costs a lot of education, it is not out of uniform education form.

Also, since current children's toys do not generate lasting interest, parents are worried about the cost of purchasing new toys. Recently, various toys and learning tools have been developed to enhance the expression and creativity of children by increasing the depth of their thinking in order to improve the economic problems of such expensive children 's tutoring and to improve the learning effect of children.

Korean Patent Laid-Open Publication No. 10-2013-0113577 (Patent Document 1) discloses a "learning providing apparatus and recording medium ", wherein the learning providing apparatus includes a learning providing apparatus for recognizing multi- A block sensing unit for sensing a block including at least one touch recognition member in contact with the screen; A block identifying unit for identifying the block using the touch recognition member of the detected block; And a content providing unit for outputting a content matched with the identified block, wherein the identification unit identifies the block in accordance with the number of touch recognition members, the placement pattern, and the distance between the touch recognition members .

In the case of Patent Document 1 as described above, it is possible to provide learning program contents which can induce interesting interest by providing a self-driven experiential learning play program using actual toys and objects, thereby reducing the amount of private education for children, There is an advantage that it contributes to improve the costly environment of learning materials to some extent.

However, since the method of recognizing multi-touch on the screen identifies the first block according to the number of the members for touch recognition, the layout pattern, and the distance between the members for touch recognition, the number of tag patterns is limited within a certain range, It does not take into consideration the installation direction or the tagging angle of the tag, and thus the recognition accuracy of the tag is lowered.

In addition, it is also possible to use blocks each including at least one of a figure, a character, a number, a symbol and a character in which a play or learning method is installed for a touch recognition member, and a touch recognition member installed in the block when the block is brought into contact with the screen The user is provided with a mission from the user terminal when the block is brought into contact with the screen using the user terminal including the block sensing unit so that the child can sit in front of the desk or sit on the floor to play or learn, Play or learning using mainly hands and head (brain) is done. Therefore, for children who are active in the middle of the day, it is possible to immediately feel tired of the play (or learning) method using only the hands and the head without moving the whole body, and thus the play or learning can not be enjoyed for a long time It implies.

Korean Patent Publication No. 10-2013-0113577 (published October 16, 2013)

The present invention has been made in order to solve the problems of the related art as described above, and it is an object of the present invention to provide a wireless terminal which can recognize a tag by using a coordinate of a plurality of points of a tag, A method of recognizing a tag for a riding device capable of further extending the number of tag patterns and increasing the recognition accuracy of the tag by recognizing the tag in consideration of the area of the polygon formed by the point, the installation direction of the tag, or the tagging angle, There is a purpose.

According to another aspect of the present invention, there is provided a recognition method of a tag for a playground,

A wireless terminal equipped with an application (App) for recognizing a tag touching a screen and proceeding with play; A tagging device disposed in the play space and having a tag for tagging by the wireless terminal; A method for recognizing a tag for a playground based on a tagging tag for a playground, the playground tag including a cloud server for storing and analyzing play data of a user, providing analysis results to the wireless terminal, and managing user information,

a) tagging a wireless terminal carried by a user (child) to a tag installed in the tagging device disposed in the play space;

b) recognizing that an end portion (point) of a plurality of tags due to the tagging is touched by an app installed in the wireless terminal, and extracting coordinate values for the plurality of points;

c) estimating a tag ID corresponding to a tag pattern formed by a plurality of points using the extracted coordinate values of the plurality of points; And

and d) confirming whether the estimated tag ID is correct by the app and confirming the final tag ID.

The step of extracting the coordinate values for the plurality of points in the step b)

b-1) determining whether three points have been recognized; And

b-2) extracting coordinate values (x, y) of three points if three points are recognized.

The step of estimating a corresponding tag ID from the coordinate values of the plurality of extracted points in the step c)

c-1) calculating a distance between each point from the coordinate values of the plurality of points;

c-2) determining whether the distance error between each point of N times immediately before is less than a predetermined value; And

c-3) If the distance error between the respective points is less than a preset value, the distance error DB between each point of the entire tag is compared with the sum of the absolute values of the errors (hereinafter referred to as an error value E ) ') Has the smallest value, it is possible to estimate the tag corresponding to the tag ID.

The first embodiment of the step of confirming the final tag ID by verifying that the estimated tag ID in step d) is correct,

d-11) determining whether the minimum error value E is less than or equal to the threshold value T;

d-12) determining the tag ID if the minimum error value E is equal to or less than the threshold value T in the determination; And

d-13) In the above determination, if the minimum error value E is not equal to or less than the threshold value T, it may be determined that the tag detection fails.

The second embodiment of the step of confirming the final tag ID by verifying that the estimated tag ID in step d) is correct,

d-21) determining whether the minimum error value E is equal to or less than the threshold value T;

If the minimum error value E is less than or equal to the threshold value T in the above determination, the area S of the triangle formed by the extracted three points is calculated. If the minimum error value E is less than or equal to the threshold value T Otherwise, it is determined that the tag detection has failed;

d-23) calculating an area ratio (S_R) between the area of the triangle of the tag ID estimated from the tag DB and the area (S) of the triangle formed by the extracted three points;

d-24) determining whether the area ratio S_R is within a threshold value; And

d-25) determining that the estimated tag ID is an accurate tag ID if the area ratio S_R is within the threshold, and determining that the tag detection fails if the area ratio S_R is not within the threshold value .

At this time, if the area ratio S_R is 0.8? S_R? 1.1 in step d-25, the estimated tag ID can be determined as an accurate tag ID.

The third embodiment of the step of verifying whether the estimated tag ID in step d) is correct and finalizing the final tag ID,

d-31) determining whether the minimum error value E is equal to or less than the threshold value T;

d-32) If the minimum error value E is less than or equal to the threshold value T, the rotation angle of the wireless terminal at the instant of tagging is calculated. If the minimum error value E is not less than the threshold value T, Determining a tag detection failure;

d-33) rotating coordinate values of the plurality of points extracted in the step b) according to the calculated rotation angle;

d-34) determining an angle of a final tag ID by comparing a rotation value of a specific angle of a tag ID with a rotation value of a coordinate value of a plurality of acquired points; And

d-35) determining the estimated tag ID having the determined angle of the final tag ID as an accurate tag ID.

At this time, the angle of the final tag ID can be determined by comparing the rotation values of the coordinate values of the obtained three points with the rotation values of the 0, 90, 180, and 270 degrees of the tag ID in step d-34 .

According to the present invention, when a tag is recognized using a wireless terminal, a distance between a plurality of points using coordinate values of a plurality of points of the tag, an area of the polygon formed by the plurality of points, It is possible to further expand the number of tag patterns by recognizing the tag in consideration of the tagging angle and to improve the recognition accuracy of the tag.

1 is a view schematically showing a configuration of a tagging system for a playground for implementing a tag recognition method for a playground apparatus according to the present invention.
FIG. 2 is a view showing a configuration of a tag installed in a tagging device of the tagging system for playgrounds of FIG. 1. FIG.
FIG. 3 is a view showing various tag patterns including three conductive tips employed in a method of recognizing a tag for a playground according to the present invention.
4 is a flowchart illustrating a method of recognizing a tag for a playground apparatus according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a tag tagging process in a touch screen portion of a wireless terminal according to a method of recognizing a tag for a playground according to the present invention.
6 is a flowchart showing a specific process for steps S420 and S430 of the flowchart of FIG.
FIG. 7 is a flowchart illustrating a first embodiment of a concrete process for step S440 of the flowchart of FIG.
FIG. 8 is a flowchart illustrating a second embodiment of a concrete process for step S440 of the flowchart of FIG.
9 is a flowchart illustrating a third embodiment of a concrete process for step S440 of the flowchart of FIG.
10 is a diagram showing the tag ID of the same pattern rotated rightward from 0 to 270 degrees in units of 90 degrees.
FIG. 11 is a diagram showing the coordinates of a screen when the wireless terminal is vertically tagged in a tag that is rotated by 90 degrees in the clockwise direction.
12 is a diagram illustrating a process of estimating a tag ID in the case of tagging by rotating the wireless terminal irrespective of the directionality of the tag in the methods 1 and 2.
13 is a diagram showing touch screen coordinates when three sets of coordinates obtained in tagging in the methods 1 and 2 are rotated so that the screen of the wireless terminal is vertical.
Fig. 14 is a diagram showing that the tag ID is rotated to the right from 0 to 270 degrees in units of 90 degrees by adding directionality to the tag pattern. Fig.
15 is a diagram illustrating a state in which a tilted angle of a wireless terminal is estimated using a three-axis acceleration sensor for detecting a rotation angle of the wireless terminal.
16 is a diagram showing an example of setting two tag patterns (TAG_A_0, TAG_A_90) having a direction of 0 degrees and 90 degrees for one tag pattern (TAG_A).
FIG. 17 is a diagram showing a result of tagging the wireless terminal by 0 degree and 90 degrees in TAG_A_0 and TAG_A_90 in FIG.
FIG. 18 is a diagram illustrating an angle in a tag (0 degree).
19 is a view schematically showing a directionality determination range according to an angle difference.
FIG. 20 is a diagram showing a case where a tag installed in the 0-degree direction is tagged without rotation of the phone.
FIG. 21 is a diagram showing a case where a tag installed in the 0 degree direction is tagged by rotating the phone by 90 degrees.
FIG. 22 is a diagram showing a case where a tag installed in a 90-degree direction is tagged without rotation of the phone.
FIG. 23 is a diagram showing a case where a tag installed in a 90-degree direction is tagged by rotating the phone by 90 degrees.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor can properly define the concept of the term to describe its invention in the best way Should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module, "and" device " Lt; / RTI >

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

1 is a diagram schematically showing a configuration of a tagging system for a playground for realizing a tag recognition method for a playground apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a tagging system 100 for a rides machine may include a wireless terminal 110, a tagging device 120, and a cloud server 130.

The wireless terminal 110 is equipped with an application (app) for recognizing a tag in contact with the screen and proceeding with the play. The wireless terminal 110 may be a smart phone, a PDA (Personal Digital Assistant), a tablet PC, a smart watch, or the like.

The tagging device 120 is disposed in a play space (for example, a playground or a kids' cafe) or a learning space (a kindergarten, an elementary school, etc.), and a tag 121 for tagging by the wireless terminal 110 Respectively. Such a tag 121 includes a plurality of (for example, three) conductive tips 121a, 121b, and 121c for tagging on the screen of the wireless terminal 110, as shown in FIG. Here, the tag pattern composed of the three conductive tips 121a, 121b and 121c may be composed of N (for example, 31) tag patterns as shown in Fig. 3, The diameter of the tip is 6 mm and the interval between the center points of the tips starts at a minimum of 13 mm within a range not exceeding the width of the touch screen of the 4-inch wireless terminal by the inventor. And the tips were arranged by changing the pattern of the tips at intervals. Here, the diameter of the tip, the minimum gap between the center points of the tip, and the basic gap (7 mm) as described above are not limited to these, and all of them can be changed.

The cloud server 130 stores and analyzes the play data of the user, provides analysis results to the wireless terminal 110, and manages user information. Here, the storage and analysis of the play data of the user and the user information management may be performed offline by the application installed in the wireless terminal 110. In some cases, the cloud server 130 may not be included in the tagging system 100 of the present invention.

A description will now be made of a method of recognizing a tag for a playground device according to the present invention based on the tagging system 100 for a playground having the above-described configuration.

4 is a flowchart illustrating a method of recognizing a tag for a playground apparatus according to an embodiment of the present invention.

4, a method for recognizing a tag for a playground apparatus according to the present invention includes a tagging system 100 for a playground including the wireless terminal 110, the tagging apparatus 120, and the cloud server 130 as described above A wireless terminal 110 (e.g., a smart phone) carried by a user (a child) is first displayed on the screen of the playground, And tags the tag 121 installed in the apparatus 120 (step S410). 5, the tag 121 is installed in the ceiling direction (horizontally upward), but the present invention is not limited thereto. The tag 121 may be vertically oriented, May be provided in various forms such as an angular direction (for example, 45 占 direction), a ceiling direction (horizontally upward direction), and a bottom direction (horizontally downward direction).

When the tagging by the wireless terminal 110 is performed in this way, a plurality of (e.g., three, but not limited to) the tagging by the application (e.g., a kind of play app, game app, (Three points in the present embodiment), it is recognized that the end portion (point) of the tag is touched, and the coordinates (coordinates) of the plurality of (three) points P1, P2, (X, y coordinate values) are extracted (step S420). This is explained later.

Thereafter, a tag ID corresponding to a tag pattern (refer to FIG. 3) formed by a plurality of (three) points using the coordinate values (x, y coordinate values) of the extracted plurality of (three) (Step S430). I will explain it again later.

If the tag ID is estimated by the above, it is verified that the estimated tag ID is correct by the app and the final tag ID is confirmed (step S440). This is explained later. The determination of the final tag ID in this way also indicates what tag 121 is recognized by the wireless terminal 110 (for example, when there is a tag to which the serial number is assigned from 1 to N, Which means that the tag recognized by the wireless terminal is the tag of the number of times). Here, the reason for verifying whether the estimated tag ID is correct is that, for example, when a child tags a tag in which a "rabbit" picture is drawn, if a "rabbit" is displayed instead of a rabbit on the screen, This is because, from the point of view of children's play, it can be a factor to halt the fun (interest) of play.

6 is a flowchart showing a specific process for steps S420 and S430 of the flowchart of FIG.

6, the step of extracting coordinate values (x, y coordinate values) for a plurality of (three) points in step S420 of FIG. 4, respectively, may include determining whether three points are recognized And extracting coordinate values (x, y) of three points (S422) if three points are recognized in the determination. At this time, if the three points are not recognized in the discrimination step S421, the process returns to the initial stage and it is determined whether three points are recognized again.

The step of estimating the tag ID corresponding to the tag pattern formed by the plurality of points using the coordinate values of the extracted plurality of (three) points in step S430 of FIG. 4 includes the steps of: Calculating (S431) the distances D1, D2, and D3 (see FIG. 11) between the respective points from the coordinate values (x, y) of the coordinates P1, P2, and P3 (see FIG. 11) A step (S432) of determining whether a distance error between respective points of the previous N times is equal to or less than a preset value; And if the distance error between the respective points in the discrimination is less than a predetermined value, it is compared with the distance error database DB between the respective points for the entire tag, and the sum of the absolute values of the errors (hereinafter referred to as the error value E (S433) of estimating the tag corresponding to the tag ID having the smallest value as the tag ID. If it is determined in step S432 that the distance error between the points is not less than the predetermined value (i.e., the distance error between the points exceeds the predetermined value), the process returns to the initial step of the process It is determined whether three points have been recognized. In step S432, in determining whether or not the distance error between each point of the immediately preceding N points is equal to or less than a predetermined value, a distance error between each point is taken three times immediately before. However, this is not limited to three circuits, and four times, five times ... , Etc., depending on the situation.

Here, a description will be given in connection with tag ID estimation in step S433. The difference between the distance value of the tag DB for each of the 31 tag patterns in FIG. 3 and the distance value (D1, D2, D3) between each point for the three points P1, P2, P3 calculated in step S431 Assuming that the sum of the absolute values is E1 to E31, a calculation example will be described.

For example, assuming that D1 = 13.5, D2 = 20.0, and D3 = 26.8, the tag DB stores the distance value of the tag when there is no error as follows.

TAG # 2 = (20,20, 27), ..., Tag # 31 = (xx, yy, zz)

The sum (E) of the absolute values of the errors from the tags DB 1 to 31 is calculated as follows.

E1 = 0.5 + 0 + 0.2 = 0.7, E2 = 6.5 + 0 + 0.2 = 6.7, ..., E31 = xx

Therefore, the smallest value (Min (E1, ..., E31)) among the above-mentioned E1 to E31 is estimated as the tag ID.

If the tag ID is estimated as described above, it is verified whether the estimated tag ID is correct as in step S440, and the final tag ID is confirmed. At this time, in verifying whether the estimated tag ID is correct, verification can be performed using the following three methods.

- Method 1: The verification method is based on the distance values (D1, D2, D3) calculated from the coordinate values of three points (P1, P2, P3) extracted by tagging

- Method 2: A method of calculating the area value from the coordinate values of three points (P1, P2, P3) and verifying the area value of the tag DB by comparing the area ratio

- Method 3: Verification method using the distance value of method 1 and acceleration sensor value of wireless terminal together

The differences between the above three methods are summarized in the following table.

1 is a diagram schematically showing a configuration of a tagging system for a playground for realizing a tag recognition method for a playground apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a tagging system 100 for a rides machine may include a wireless terminal 110, a tagging device 120, and a cloud server 130.

The wireless terminal 110 is equipped with an application (app) for recognizing a tag in contact with the screen and proceeding with the play. The wireless terminal 110 may be a smart phone, a PDA (Personal Digital Assistant), a tablet PC, or the like.

The tagging device 120 is disposed in a play space (for example, a playground, a kids' cafe, etc.), and a tag 121 for tagging by the wireless terminal 110 is installed in the body. Such a tag 121 includes a plurality of (for example, three) conductive tips 121a, 121b, and 121c for tagging on the screen of the wireless terminal 110, as shown in FIG. Here, the tag pattern composed of the three conductive tips 121a, 121b and 121c may be composed of N (for example, 31) tag patterns as shown in Fig. 3, The diameter of the tip is 6 mm and the interval between the center points of the tips starts at a minimum of 13 mm within a range not exceeding the width of the touch screen of the 4-inch wireless terminal by the inventor. And the tips were arranged by changing the pattern of the tips at intervals.

The cloud server 130 stores and analyzes the play data of the user, provides analysis results to the wireless terminal 110, and manages user information.

A description will now be made of a method of recognizing a tag for a playground device according to the present invention based on the tagging system 100 for a playground having the above-described configuration.

4 is a flowchart illustrating a method of recognizing a tag for a playground apparatus according to an embodiment of the present invention.

4, a method for recognizing a tag for a playground apparatus according to the present invention includes a tagging system 100 for a playground including the wireless terminal 110, the tagging apparatus 120, and the cloud server 130 as described above A wireless terminal 110 (e.g., a smart phone) carried by a user (a child) is first displayed on the screen of the playground, And tags the tag 121 installed in the apparatus 120 (step S410). 5, the tag 121 is installed in the ceiling direction (horizontally upward), but the present invention is not limited thereto. The tag 121 may be vertically oriented, May be provided in various forms such as an angular direction (for example, 45 占 direction), a ceiling direction (horizontally upward direction), and a bottom direction (horizontally downward direction).

When tagging is performed by the wireless terminal 110 in this way, a plurality of tags (for example, three tags) corresponding to the tagging by an app (for example, a kind of play app, game app, (X, y coordinate values) for a plurality of (three) points P1, P2, and P3 are extracted (step S420). This is explained later.

Thereafter, a tag ID corresponding to a tag pattern (refer to FIG. 3) formed by a plurality of (three) points using the coordinate values (x, y coordinate values) of the extracted plurality of (three) (Step S430). I will explain it again later.

If the tag ID is estimated by the above, it is verified that the estimated tag ID is correct by the app and the final tag ID is confirmed (step S440). This is explained later. The determination of the final tag ID in this way also indicates what tag 121 is recognized by the wireless terminal 110 (for example, when there is a tag to which the serial number is assigned from 1 to N, Which means that the tag recognized by the wireless terminal is the tag of the number of times).

6 is a flowchart showing a specific process for steps S420 and S430 of the flowchart of FIG.

6, the step of extracting coordinate values (x, y coordinate values) for a plurality of (three) points in step S420 of FIG. 4, respectively, may include determining whether three points are recognized And extracting coordinate values (x, y) of three points (S422) if three points are recognized in the determination. At this time, if the three points are not recognized in the discrimination step S421, the process returns to the initial stage and it is determined whether three points are recognized again.

The step of estimating the tag ID corresponding to the tag pattern formed by the plurality of points using the coordinate values of the extracted plurality of (three) points in step S430 of FIG. 4 includes the steps of: Calculating (S431) the distances D1, D2, and D3 (see FIG. 11) between the respective points from the coordinate values (x, y) of the coordinates P1, P2, and P3 (see FIG. 11) A step (S432) of determining whether a distance error between respective points of the previous N times is equal to or less than a preset value; And if the distance error between the respective points in the discrimination is less than a predetermined value, it is compared with the distance error database DB between the respective points for the entire tag, and the sum of the absolute values of the errors (hereinafter referred to as the error value E (S433) of estimating the tag corresponding to the tag ID having the smallest value as the tag ID. If it is determined in step S432 that the distance error between the points is not less than the predetermined value (i.e., the distance error between the points exceeds the predetermined value), the process returns to the initial step of the process It is determined whether three points have been recognized. In step S432, in determining whether or not the distance error between each point of the immediately preceding N points is equal to or less than a predetermined value, a distance error between each point is taken three times immediately before.

Here, a description will be given in connection with tag ID estimation in step S433. The difference between the distance value of the tag DB for each of the 31 tag patterns in FIG. 3 and the distance value (D1, D2, D3) between each point for the three points P1, P2, P3 calculated in step S431 Assuming that the sum of the absolute values is E1 to E31, a calculation example will be described.

For example, assuming that D1 = 13.5, D2 = 20.0, and D3 = 26.8, the tag DB stores the distance value of the tag when there is no error as follows.

TAG # 2 = (20,20, 27), ..., Tag # 31 = (xx, yy, zz)

The sum (E) of the absolute values of the errors from the tags DB 1 to 31 is calculated as follows.

E1 = 0.5 + 0 + 0.2 = 0.7, E2 = 6.5 + 0 + 0.2 = 6.7, ..., E31 = xx

Therefore, the smallest value (Min (E1, ..., E31)) among the above-mentioned E1 to E31 is estimated as the tag ID.

If the tag ID is estimated as described above, it is verified whether the estimated tag ID is correct as in step S440, and the final tag ID is confirmed. At this time, in verifying whether the estimated tag ID is correct, verification can be performed using the following three methods.

- Method 1: The verification method is based on the distance values (D1, D2, D3) calculated from the coordinate values of three points (P1, P2, P3) extracted by tagging

- Method 2: A method of calculating the area value from the coordinate values of three points (P1, P2, P3) and verifying the area value of the tag DB by comparing the area ratio

- Method 3: Verification method using the distance value of method 1 and acceleration sensor value of wireless terminal together

Table 3 shows the differences between the above three methods.

system Method 1 Method 2 Method 3 Tag Directionality Do not distinguish Do not distinguish Distinguish Distance value Used Used (optional)) Used Area ratio Not used Used Not used Smartphone sensor Not used Not used Used

FIG. 7 is a flowchart illustrating a first embodiment of a concrete process for step S440 of the flowchart of FIG.

Referring to FIG. 7, this corresponds to the above-described method 1, and the step of verifying whether the estimated tag ID is correct in step S440 of FIG. 4 and confirming the final tag ID includes a step of obtaining a minimum error value E , A step S441 of determining whether the sum of the absolute values of the errors is the smallest is equal to or smaller than the threshold value T; In this determination, if the minimum error value E is equal to or less than the threshold value T, step S442 of determining the tag ID; And determining (S443) if the minimum error value (E) is not equal to or less than the threshold value (T) in the step S441. Here, the threshold value T may be set to an experimentally determined value of 5 to 10. At this time, the threshold value T is not limited to 5 to 10, and may be set to another value.

FIG. 8 is a flowchart illustrating a second embodiment of a concrete process for step S440 of the flowchart of FIG.

Referring to FIG. 8, this corresponds to the above-described method 2, and the step of verifying whether the estimated tag ID is correct in step S440 of FIG. 4 and confirming the final tag ID comprises: A step (S441) of judging whether the value is equal to or smaller than a value (T); If the minimum error value E is less than or equal to the threshold value T in the determination, the area S of the triangle formed by the extracted three points is calculated in step S442. If the minimum error value E is less than or equal to the threshold value T Otherwise, it is determined that the tag detection has failed (S443); (S_R) between the area S of the triangle of the tag ID estimated from the tag DB and the area S of the triangle formed by the extracted three points (i.e., the area S of the triangle formed by the extracted three points calculated in step S442) = Area S of the triangle formed by the extracted three points / area S of the triangle of the tag ID estimated from the tag DB) (S444); Determining whether the area ratio S_R is within a threshold value T (S445); (Step S446). If the area ratio S_R is not within the threshold T, the tag ID is determined as the correct tag ID (step S446). If the area ratio S_R is not within the threshold value T And determining (S443) whether the failure is a failure. At this time, if the area ratio S_R is 0.8? S_R? 1.1 in step S446, the estimated tag ID can be determined as an accurate tag ID. Here, such an area ratio S_R is not limited to a range of 0.8? S_R? 1.1, but may be changed to a value in another range.

In methods 1 and 2 as described above, there may be an error between the actual coordinates and the measurement (detection) coordinates due to the touch screen hardware of the wireless terminal, the operating system (Android, iOS), and environmental factors. In this case, considering only the geometric relationship between the points, the accuracy of the touch screen coordinates may not be accurately reflected in the overall error of the touch screen coordinates. However, in the case of the area value, the overall error is reflected in the shape of the graphic form, and therefore, the method 2 can be said to have a higher accuracy than the method 1.

9 is a flowchart illustrating a third embodiment of a concrete process for step S440 of the flowchart of FIG.

Referring to FIG. 9, this corresponds to the above-described method 3, and the step of verifying whether the estimated tag ID is correct in step S440 of FIG. 4 and confirming the final tag ID comprises: A step (S441) of judging whether the value is equal to or smaller than a value (T); If the minimum error value E is less than or equal to the threshold value T, the rotation angle of the wireless terminal 110 (smartphone) at the instant of tagging is calculated (step S442). If the minimum error value E is less than the threshold value T (S443) if the tag detection is not successful; (S444) rotating the coordinate values (x, y) of the plurality of (three) points extracted in the step S420 according to the calculated rotation angle; Comparing the rotation value of the specific angle of rotation of the tag ID with the rotation value of the coordinates of the acquired plurality of points to determine the angle of the final tag ID (S445); And determining an estimated tag ID whose angle of the final tag ID is determined to an accurate tag ID (S446). At this time, in step S445, the rotation values of the coordinate values of the obtained three points are compared with the rotation values of 0, 90, 180, and 270 degrees of the tag ID, and two values are matched or an error between the two values is allowed The angle of the final tag ID can be determined. In this case, the unit of the angle is not limited to 90 °, and may be changed to 60 °, 120 °, or the like.

Hereinafter, a description will be given in conjunction with the above-described method 3.

Method 3 is intended to solve the problem of limiting the number of tags in methods 1 and 2. The methods 1 and 2 have a limitation that the number of detectable tags is limited to 31 because of the restriction of the screen of 4 inches of the wireless terminal (smartphone). In order to solve this problem, in the method 3, tags with the same pattern are recognized as different tag IDs according to the tag installation direction.

10 is a diagram showing the tag ID of the same pattern rotated rightward from 0 to 270 degrees in units of 90 degrees.

In the methods 1 and 2, the same tag ID is recognized regardless of the installation direction of the tag. In the method 3, the rotation angle of the wireless terminal at the time of tagging can be estimated using the acceleration sensor of the wireless terminal, The number of tags can be expanded considering the installation direction of the tag. In the case of FIG. 10, the number of tags is extended four times in consideration of the tag direction in units of 90 degrees.

In relation to the above, the difference between the methods 1 and 2 and the method 3 will be explained in more detail.

In the case of the methods 1 and 2, the tag ID is determined only by the coordinate points on the screen regardless of the tag installation direction and the tagging angle.

FIG. 11 is a diagram showing the coordinates of a screen when the wireless terminal is vertically tagged in a tag that is rotated by 90 degrees in the clockwise direction.

11, in the touch screen coordinate system, the lower left end is the origin (0, 0). The process of estimating the tag ID from the coordinates of three points in the methods 1 and 2 is as follows.

1) Find the point with the largest Y value

2) Turning clockwise to obtain a set of distance values

3) Change the order of the set so that the largest distance value comes before it while maintaining directionality.

4) Estimate the tag ID by comparing the set with the distance value of the tag DB

The process of estimating the tag ID for FIG. 11 is as shown in the following table, and all three cases (0 degree, 90 degree, 180 degree) estimate the same tag ID as a result. That is, the directionality of the tag is independent of the tag ID estimation. Table 2 summarizes these results.

step 0 ° 90 ° 180 ° One Coordinate 1 Coordinate 2 Coordinate 3
2 1 to 3 → 27
3 to 2 → 20
2 to 1 → 13 2 to 1 → 13
1 to 3 → 27
3 to 2 → 20 3 to 2 → 20
2 to 1 → 13
1 to 3 → 27
3
27, 20, 13 13, 27, 20
27, 20, 13 20, 13, 27
13, 27, 20
27, 20, 13 4 The error values are the same and are estimated with the same tag ID.

<0 °> 1) Position 1 is located at the top,

2) Obtain a set of (27, 20, 13) sets of distances between 1 and 3 clockwise

3) The largest value is at the beginning of the set

4) set is compared with the tag DB to calculate the error value, and the tag ID estimate

<For 90 °>

1) Position 2 is at the top,

2) Obtain the set (13, 27, 20) by finding the distance between 2 points and 3 points clockwise

3) Since the largest value is not at the beginning of the set, change the order of the numbers one time so that 27 is before

4) set is compared with the tag DB to calculate the error value, and the tag ID estimate

<180 °>

1) Coordinate 3 is located at the top,

2) Obtain the set (20, 13, 27) by finding the distance between 3 points in the clockwise direction from 3

3) Since the largest value is not at the beginning of the set, change the order of the numbers to 2 so that 27 is before

4) set is compared with the tag DB to calculate the error value, and the tag ID estimate

12 is a diagram illustrating a process of estimating a tag ID in the case of tagging by rotating the wireless terminal irrespective of the directionality of the tag in the methods 1 and 2.

Referring to FIG. 12, it is assumed that the tag is fixed in one direction, and the wireless terminal is rotated in units of 90 degrees and tagged 3 times (0 degree, 90 degrees, 180 degrees).

Three points are arranged as shown in Fig. 13 when the coordinates of three sets (one set is three points) obtained by tagging are rotated so that the screen of the wireless terminal is vertical. In the touch screen coordinate system, ). The method of arranging the coordinates in the method 1 and 2 is as follows.

1) Find the point with the largest Y value

2) Turning clockwise to obtain a set of distance values

3) Change the order of the set so that it is preceded by the largest value while maintaining directionality.

4) Estimate the tag ID by comparing the set with the distance value of the tag DB

The tag ID estimation process of FIG. 13 is summarized in the following Table 3, and the same tag ID is estimated as a result.

step 0 ° 90 ° 180 ° One Coordinate 1 Coordinate 3 Coordinate 3
2 1 to 3 → 27
3 to 2 → 20
2 to 1 → 13 3 to 2 → 20
2 to 1 → 13
1 to 3 → 27 3 to 2 → 20
2 to 1 → 13
1 to 3 → 27
3
27, 20, 13 20, 13, 27
13, 27, 20
27, 20, 13 20, 13, 27
13, 27, 20
27, 20, 13 4 The error values are the same and are estimated with the same tag ID.

<0 °> 1) Position 1 is located at the top,

2) Obtain a set of (27, 20, 13) sets of distances between 1 and 3 clockwise

3) The largest value is at the beginning of the set

4) set is compared with the tag DB to calculate the error value, and the tag ID estimate

<For 90 ° and 180 °>

1) Coordinate 3 is located at the top,

2) Obtain the set (20, 13, 27) by finding the distance between 3 points in the clockwise direction from 3

3) Since the largest value is not at the beginning of the set, change the order of the numbers to 2 so that 27 is before

4) set is compared with the tag DB to calculate the error value, and the tag ID estimate

As described above, the direction of the tag is fixed, and the same tag ID is estimated even if tagging is performed while the wireless terminal is rotated. That is, in the methods 1 and 2, it can be seen that the directionality of both the tag and the wireless terminal does not influence the tag ID estimation at all.

Hereinafter, the process of estimating the tag ID in the case of considering the tag directionality corresponding to the method 3 will be described.

As described above, in the methods 1 and 2, the tag installation direction is not related to the tag ID estimation, but in the method 3, the tag ID is estimated by distinguishing the directionality of the tag. Through this, it is possible to expand the number of recognizable tag IDs by combining directionality with 31 existing tag patterns. As shown in Fig. 14, in the case of installing the tag with directionality by rotating the tag pattern in units of 90 degrees, in the above-described methods 1 and 2, unlike the tag IDs recognized only by one type of tag ID, Tag x 360/90 = four types of tag IDs.

In order to consider the installation orientation of the tag to the tag ID estimation, it is necessary for the wireless terminal to detect the angle that is rotated around the tag pattern when tagging.

It is possible to estimate a tilted angle as shown in FIG. 15 by using a three-axis acceleration sensor for detecting the rotation angle of the wireless terminal.

In order to explain the concept, a description will be made by taking as an example a case where 0 and 90 degrees tags are tagged by 0 degrees and 90 degrees, respectively. 16, it is assumed that there is TAG_A_0 and TAG_A_90 having a direction of 0 degree and 90 degree with respect to one tag pattern (TAG_A).

TAG_A_0, and TAG_A_90, and the result of each tagging is the same as the first row of FIG. The result of the rotation based on the touch screen coordinates of the wireless terminal for the TAG_ID estimation is the same as the second row in FIG. Finally, the result of rotating the tag pattern reflecting the rotation angle of the wireless terminal during tagging is the same as the last row of FIG.

TAG_A_0 is rotated by 0 degrees and 90 degrees, and the image is tagged as follows. As a result of tagging TAG_A_0, two sets of coordinate values that do not consider the directionality of the tag are obtained as in the method 1 at first. That is, (1, 2, 3) and (3, 1, 2) are obtained on the basis of the Y-axis maximum value. However, in the last row, when calibration is performed through the rotation angle of the wireless terminal during tagging, the coordinates of (3, 1, 2) are rotated to (1, 2, 3) . TAG_A_90 also results in two sets of (2,3,1).

That is, in the method 3, it is possible to secure the coordinates in consideration of the installation direction of the tag. Accordingly, instead of estimating the tag ID only in the order of the distance values as in the methods 1 and 2, The tag ID can be estimated, and the number of tags can be expanded.

Here, a description will be given in more detail with respect to the estimation of the tag ID in consideration of the shape formed by the coordinates of the three points.

FIG. 18 is a diagram illustrating an angle in a tag (0 degree).

Referring to FIG. 18, an angle (Base Angle) between the longest axis of the tag used and a horizontal line is stored in advance in the database (DB) of the tag, and has only a value for 0 degree as a reference. Fig. 18 shows the case of the seventh, thirteenth and sixteenth tags as an example of the angle with respect to the longest axis.

Here, an algorithm considering the shape is as follows.

Step 1: Detect the angle that the longest axis of measured coordinate forms with the horizontal line (Tag_Angle).

Step 2: Detect the rotation angle of the smartphone (Rotation_Angle).

Step 3: Add "Rotation_Angle" to "Tag_Angle" and calculate the angle difference with Base_Angle as shown in FIG. 19 to determine the ID taking into consideration the orientation of the installed tag.

That is, when the angle difference from Base_Angle is -45 ° (315 °) to 45 °, the direction ID is determined as N_0, which means that it is installed at 0 degree rotation. Also, when the angle difference from Base_Angle is 45 ° to 135 °, the direction ID is determined as N_1, which means that it is installed at 90 ° rotation. Also, when the angle difference from Base_Angle is 135 ° to 225 °, the direction ID is determined as N_2, which means that it is installed at 180 ° rotation. And, when the angle difference from Base_Angle is 225 ° ~ 315 °, the direction ID is determined as N_3, which means 270 ° rotation installation.

<Tagging the tag installed in the direction of 0 degrees without rotating the phone>

A description will be given of a process of grasping the shape of the tag 121 with the tag ID 3 whose base angle is?, Which is provided in the 0 degree direction. First, the case of tagging the tag 121 installed in the 0 degree direction without rotating the wireless terminal (smartphone) 110 is as shown in FIG.

1) The angle between the longest axis and the horizontal line is detected (Tag_Angle = α)

2) Measure the rotation angle of the smartphone calculated from the acceleration sensor (Rotation_angle = 0 degrees)

3) calculating a difference TAG_Angle Rotation_Angle and calculates the difference between (α), Base Angle (α ) (0 degrees), and finally Tag ID 3.0 (ID value of Tag3 rotated by 0 degree)

<Tagging the tag installed in the direction of 0 degrees by rotating the phone 90 degrees>

FIG. 21 shows a case of tagging tags installed in the 0 degree direction by rotating the smartphone by 90 degrees. The vertical arrangement of the smartphone rotated 90 degrees is for convenience of explanation.

1) The angle between the longest axis and the horizontal line is detected (Tag_Angle = α-90 degrees)

2) The rotation angle of the smartphone calculated from the acceleration sensor (Rotation_angle = 90 degrees)

3) Calculate the difference between TAG_Angle and Rotation_Angle (α), calculate the difference from Base Angle (α) (0 degree), and finally detect Tag ID 3.0 (Tag3 rotated ID 0).

<When tagging a tag installed in the direction of 90 degrees without rotating the phone>

A process of grasping the shape of the tag ID 3 having the base angle of? And the tag being installed in the direction of 90 degrees will be described as an example. First, a tag tagged in a direction of 90 degrees without rotation of a smartphone is tagged as shown in FIG.

1) The angle of the longest axis with the horizontal line is detected (Tag_Angle = α + 90 degrees)

2) The rotation angle of the smartphone calculated from the acceleration sensor (Rotation_angle = 0 degrees)

3) Calculate the difference between TAG_Angle and Rotation_Angle (α + 90 degrees), calculate the difference from Base Angle (α) (90 degrees), and finally detect Tag ID 3.1 (Tag3 rotated by 90 degrees) .

<Tagging the tag installed in the direction of 90 degrees by rotating the phone 90 degrees>

FIG. 23 shows a case of tagging a tag installed in a direction of 90 degrees by rotating the smartphone by 90 degrees. The vertical arrangement of the smartphone rotated 90 degrees is for convenience of explanation.

1) The angle of the longest axis with the horizontal line is detected (Tag_Angle = α + 90 degrees)

2) The rotation angle of the smartphone calculated from the acceleration sensor (Rotation_angle = 90 degrees)

3) Calculate the difference between TAG_Angle and Rotation_Angle (α + 90 degrees), calculate the difference from Base Angle (α) (90 degrees), and finally detect Tag ID 3.1 (Tag3 rotated by 90 degrees) .

As described above, according to the present invention, there is provided a method of recognizing a tag for a playground device, comprising the steps of: recognizing a tag using a wireless terminal, The number of tag patterns can be further expanded by recognizing the area of the polygon formed by the point, the installation direction of the tag, or the tagging angle, thereby improving the recognition accuracy of the tag.

In addition, a user (mainly a child) in a play space (for example, a playground, a kids cafe, etc.) or a learning space (kindergarten, elementary school, etc.) moves around while carrying a wireless terminal When tagging a wireless terminal with a tag, an application mounted on the wireless terminal recognizes the tag and provides a corresponding mission. By performing the mission, the user (child) can enjoy the play and obtain indirect learning and educational effect There is an advantage.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. Be clear to the technician. Accordingly, the true scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the same should be construed as being included in the scope of the present invention.

100: Tagging system for rides 110: Wireless terminal
120: tagging device 121: tag
121a, 121b, 121c: conductive tip 130: cloud server

Claims (10)

A wireless terminal equipped with an application (App) for recognizing a tag touching a screen and proceeding with play; A tagging device disposed in the play space and having a tag for tagging by the wireless terminal; A method for recognizing a tag for a playground based on a tagging tag for a playground, the playground tag including a cloud server for storing and analyzing play data of a user, providing analysis results to the wireless terminal, and managing user information,
a) tagging a wireless terminal carried by a user (child) to a tag installed in the tagging device disposed in the play space;
b) recognizing that an end portion (point) of a plurality of tags due to the tagging is touched by an app installed in the wireless terminal, and extracting coordinate values for the plurality of points;
c) estimating a tag ID corresponding to a tag pattern formed by a plurality of points using the extracted coordinate values of the plurality of points; And
d) verifying whether the estimated tag ID is correct by the app and confirming the final tag ID;
In verifying whether the estimated tag ID is correct in step d), an area value is calculated from coordinate values of three points (P1, P2, P3) extracted by the tagging, and the area value and the area ratio of the tag DB are compared (D1, D2, D3) calculated from the coordinate values of the three points (P1, P2, P3) extracted by the tagging and the acceleration sensor value of the wireless terminal together Or the like,
The step of extracting the coordinate values for the plurality of points in the step b)
b-1) determining whether three points have been recognized; And
b-2) extracting coordinate values (x, y) of three points if three points are recognized,
The step of verifying whether the estimated tag ID in step d) is correct and finalizing the final tag ID comprises:
d-21) determining whether the minimum error value E is equal to or less than the threshold value T;
If the minimum error value E is less than or equal to the threshold value T in the above determination, the area S of the triangle formed by the extracted three points is calculated. If the minimum error value E is less than or equal to the threshold value T Otherwise, it is determined that the tag detection has failed;
d-23) calculating an area ratio (S_R) between the area of the triangle of the tag ID estimated from the tag DB and the area (S) of the triangle formed by the extracted three points;
d-24) determining whether the area ratio S_R is within a threshold value; And
d-25) determining that the estimated tag ID is an accurate tag ID if the area ratio S_R is within the threshold, and determining that the tag detection fails if the area ratio S_R is not within the threshold value In addition,
The step of verifying whether the estimated tag ID in step d) is correct and finalizing the final tag ID comprises:
d-31) determining whether the minimum error value E is equal to or less than the threshold value T;
d-32) If the minimum error value E is less than or equal to the threshold value T, the rotation angle of the wireless terminal at the instant of tagging is calculated. If the minimum error value E is not less than the threshold value T, Determining a tag detection failure;
d-33) rotating coordinate values of the plurality of points extracted in the step b) according to the calculated rotation angle;
d-34) determining an angle of a final tag ID by comparing a rotation value of a specific angle of a tag ID with a rotation value of a coordinate value of a plurality of acquired points; And
d-35) determining an estimated tag ID whose angle of the final tag ID is fixed to an accurate tag ID,
Wherein the angle of the final tag ID is determined by comparing the rotation value of the coordinate values of the acquired three points with the rotation value of the tag ID in the step d-34).
delete The method according to claim 1,
The step of estimating a corresponding tag ID from the coordinate values of the plurality of extracted points in the step c)
c-1) calculating a distance between each point from the coordinate values of the plurality of points;
c-2) determining whether the distance error between each point of N times immediately before is less than a predetermined value; And
c-3) If the distance error between the respective points is less than a preset value, the distance error DB between each point of the entire tag is compared with the sum of the absolute values of the errors (hereinafter referred to as an error value E ) 'Has the smallest value, estimating the tag corresponding to the tag as the tag ID.
The method according to claim 1,
Wherein in estimating a tag ID corresponding to a tag pattern formed by a plurality of points using the coordinate values of the extracted plurality of points in the step c) A method of recognizing a tag for a playground device estimating a tag ID in consideration of a shape formed by coordinates of a point.
delete The method according to claim 1,
The step of verifying whether the estimated tag ID in step d) is correct and finalizing the final tag ID comprises:
d-11) determining whether the minimum error value E is less than or equal to the threshold value T;
d-12) determining the tag ID if the minimum error value E is equal to or less than the threshold value T in the determination; And
d-13) determining whether the tag detection is failed if the minimum error value E is not equal to or less than the threshold value T in the determination.
delete The method according to claim 1,
Wherein the estimated tag ID is determined to be an accurate tag ID when the area ratio S_R is 0.8? S_R? 1.1 in the step d-25. delete delete

Images