JP2012090709A - Mobile terminal, program and method for counting golf stroke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile terminal, program and method, for determining the number of strokes as accurately as possible using an acceleration sensor mounted on the mobile terminal carried by a player.SOLUTION: The mobile terminal includes: a vertical acceleration calculation means for calculating vertical acceleration based on acceleration data; a moving time section detecting means for detecting a plurality of moving time sections during walking by using a maximum point or a minimum point of vertical upward acceleration as walking timing; a stroke candidate detecting means for detecting a stroke candidate point based on a change of the vertical acceleration or the acceleration data; a stroke detecting means for detecting one or more stroke candidate points as one stroke when one or more stroke candidate points are detected between the moving time sections; and a stroke counting means for counting the number of detected strokes.

Description

  The present invention relates to a technique for counting golf hits.

  Conventionally, the number of hits in a golf game has been recorded by the player himself / herself on a score sheet. Since the counting of the number of hits is left to the player himself, in particular, the player who has less golf experience often forgets to count or mistakes for entering the score sheet.

  On the other hand, there is a technique of a hit number counter device that automatically counts the hit number of golf (for example, see Patent Document 1). This striking-counter device is a wristband-like housing and is attached to the player's own wrist. In addition, this apparatus is equipped with an acceleration sensor, and can detect a large acceleration generated when the player swings the golf club down. The number of times the acceleration reaches a predetermined value or more is counted as the number of hits.

JP 2004-222820 A

  However, the golf player usually swings many times other than actually hitting the ball. Simply counting the acceleration of a predetermined value or more simply counts more hits than the actual number of hits.

  Accordingly, an object of the present invention is to provide a mobile terminal, a program, and a method for determining the number of hits as accurately as possible using an acceleration sensor mounted on a mobile terminal carried by a player.

According to the present invention, a portable terminal that counts the number of hits of a ball using an acceleration sensor that outputs acceleration data to be carried by a golf player,
Vertical acceleration calculating means for calculating vertical acceleration from acceleration data;
A moving time interval detecting means for detecting a plurality of moving time intervals during walking with a maximum point (or minimum point) of vertical upward acceleration as a walking timing;
A hit candidate detection means for detecting a hit candidate time point from a change in vertical acceleration or acceleration data;
A hit detection means for detecting one hit when one or more hit candidate time points are detected between the moving time intervals excluding the moving time interval;
It has a striking number counting means for counting the number of hits detected.

  According to another embodiment of the portable terminal of the present invention, it is also preferable that the hit candidate detecting means detects an acceleration having a magnitude greater than or equal to a predetermined threshold as the hit candidate point.

  According to another embodiment of the portable terminal of the present invention, the hit candidate detection means calculates a set of vectors based on the posture that the player holds in the club before hitting from the set of acceleration vectors of each axis. When detected, it is also preferable to detect as a hitting candidate time point.

According to another embodiment of the mobile terminal of the present invention,
The hit candidate detecting means determines the “standing” posture under the following conditions: (1) max _p∈Paddress (ps · p)> φ ₁ φ ₁ : threshold or (2) max _p∈Paddress (ps · p)> max _p∈Pstand (ps · p)
Paddress: A set of postures (vectors) when “ready”
Pstand: A set of postures (vectors) when “standing” ps: postures (vectors) detected by sensors
ps · p = ps _x · p _x + ps _y · _py + ps _z · p _z (inner product)
It is also preferable that max: the maximum value.

According to another embodiment of the mobile terminal of the present invention,
The vertical acceleration calculation means is
The gravity vector G is calculated in advance based on the triaxial acceleration data output from the acceleration sensor, and the vertical downward unit vector e _Down is calculated by G / | G |
It is also preferable to calculate the vertical acceleration based on the triaxial acceleration data output from the acceleration sensor and the vertical downward unit vector e _Down .

According to another embodiment of the mobile terminal of the present invention,
Positioning means for receiving positioning radio waves;
Positioning control means for controlling the positioning time point relative to the positioning means,
The positioning control means
Instruct the positioning means to perform positioning at least once between travel time intervals,
When one hit is detected by the hit detecting means, the position information obtained by positioning is associated with the identifier representing the hit,
It is also preferable to output the batting identifier and position information to the display control means.

According to the present invention, there is provided a program for causing a computer mounted on a portable terminal to count the number of hits of a ball using an acceleration sensor that outputs acceleration data to be possessed by a golf player,
Vertical acceleration calculating means for calculating vertical acceleration from acceleration data;
A moving time interval detecting means for detecting a plurality of moving time intervals during walking with a maximum point (or minimum point) of vertical upward acceleration as a walking timing;
A hit candidate detection means for detecting a hit candidate time point from a change in vertical acceleration or acceleration data;
A hit detecting means for detecting one hit when one or more hit candidate time points are detected between the movement time sections;
The computer is made to function as a hit number counting means for counting the number of hits detected.

According to the present invention, there is provided a method for counting the number of hits of a ball using a portable terminal having an acceleration sensor that outputs acceleration data to be carried by a golf player,
Calculating vertical acceleration from acceleration data;
Detecting a plurality of moving time sections during walking with a local maximum point (or minimum point) of vertical upward acceleration as a walking timing;
Detecting a hitting candidate time point from a change in vertical acceleration or acceleration data;
Detecting one hit when one or more hit candidate time points are detected between travel time intervals; and
Counting the number of hits detected.

  According to the portable terminal, the program, and the method of the present invention, it is possible to determine the number of hits as accurately as possible by using an acceleration sensor mounted on the portable terminal carried by the player.

It is explanatory drawing showing the portable terminal possessed by the golf player and its movement locus | trajectory. It is a 1st graph showing the acceleration according to the elapsed time of S1. It is a 2nd graph showing the acceleration according to the elapsed time of S2. It is a 3rd graph showing the acceleration according to the elapsed time of the last S4. It is a functional block diagram of the portable terminal in this invention. It is a graph of the acceleration for every axis | shaft according to elapsed time. It is a graph of the vertical direction acceleration according to elapsed time. It is a graph showing the acceleration of each axis | shaft until a player strikes after holding. It is a graph showing the acceleration of each axis | shaft when a player is "standing" or "standing". It is a screen transition diagram displayed on the display of the portable terminal when playing in one hole.

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

  FIG. 1 is an explanatory diagram showing a portable terminal possessed by a golf player and its movement trajectory.

In the golf competition, a player competes to hit a stationary ball using a club and put the ball into a cup on the green.
(S1) The player first swings with a club for each hole. And as a 1st shot, a tee shot is performed from the teeing ground which is a launch point.
(S2) Next, the player walks to the position where the ball stops, and performs a second shot.
(S3) Further, the player again walks to the position where the ball has stopped and makes a third shot.
(S4) Finally, the player puts a cup on the green. For each hole, the number of hits is counted. As a result, the total number of strokes is competed.

  According to FIG. 1, the player has a portable terminal 1. The mobile terminal 1 is preferably a mobile phone or a smartphone. The player hits the ball with the mobile terminal 1 in the clothes pocket. For example, it is generally considered that a sense of incongruity does not occur when the portable terminal 1 is placed in a back pocket of a trouser in which a score card is placed.

  Moreover, the portable terminal 1 has a built-in acceleration sensor. The shake of the player's body is detected as acceleration data by the acceleration sensor of the portable terminal 1.

  FIG. 2 is a first graph showing acceleration according to the elapsed time of S1.

  According to the graph of FIG. 2, the horizontal axis is the elapsed time, and the vertical axis is the acceleration. According to the graph of FIG. 2, the elapsed time from when the player is ready to hit a stationary ball on the teeing ground, which is the launching point, to when the ball is hit is shown. Here, it can be understood that a large acceleration is detected upon impact. Therefore, it is possible to count the number of hits by detecting an acceleration equal to or higher than a predetermined value (see, for example, Patent Document 1).

  FIG. 3 is a second graph showing acceleration according to the elapsed time of S2.

  According to the graph of FIG. 3, the elapsed time from when the player “walks”, “swipes” near the ball, and holds the ball to hit a stationary ball until “hit” is shown. . Here, it can be understood that a large acceleration is detected during walking and swinging. Therefore, it can be understood that it is not appropriate to count the number of hits only by detecting an acceleration of a predetermined value or more. Moreover, according to the graph of FIG. 3, the acceleration at the time of impact is small compared with the case of the graph of FIG.

  FIG. 4 is a third graph showing the acceleration according to the elapsed time of the last S4.

  According to the graph of FIG. 4, the acceleration at the time of impact is further smaller than in the case of the graph of FIG. The closer to the cup on the green, the smaller the acceleration detected by hitting. This is based on the player moving the club straight back and forward rather than swinging it up and down when putting on the green. Also from these points, it can be understood that it is difficult to detect only the impact only by detecting an acceleration of a predetermined value or more.

The point that became clear in FIG. 1 to FIG.
“Move to the point where the ball is stationary and hit the ball”,
That is, (Condition 1) “Do not hit the ball while the ball is moving to a stationary point”
That's what it means.
Players must
“If you hit the ball, it will move to the rest point of the ball”,
That is, (Condition 2) “Do not hit the ball twice at the same point”
That's what it means.
Then
“The time interval related to a single strike is always sandwiched between the movement time interval and the movement time interval.”
I understand that.
That is, even if acceleration of a predetermined value or more is detected a plurality of times, an accurate number of strokes is counted by counting the number of times as “1” while sandwiched between the movement time interval and the movement time interval. can do.

  FIG. 5 is a functional configuration diagram of the mobile terminal according to the present invention.

  According to FIG. 5, the mobile terminal 1 is a size that can be held during golf play, and is, for example, a mobile phone or a smartphone. The portable terminal 1 includes a hit number determination unit 10, an acceleration sensor 11, a positioning unit 12, a display unit 13, a positioning control unit 14, a course map storage unit 15, and a display control unit 16. The number-of-stroke determination unit 10, the positioning control unit 14, the course map storage unit 15, and the display control unit 16 are realized by executing a program that causes a computer mounted on a portable terminal to function.

  The acceleration sensor 11 detects acceleration (sensor coordinate system) for each of the x-axis, y-axis, and z-axis. In the case of existing general mobile phones, there are many cases in which an acceleration sensor is mounted in advance.

  FIG. 6 is a graph of acceleration for each axis according to elapsed time.

  According to FIG. 6, when a pedestrian holds a portable terminal and walks while visually recognizing the display unit, acceleration data for each axis obtained by the acceleration sensor is shown. The detected acceleration data is output to the hit number determination unit 10.

  The positioning unit 12 receives positioning radio waves from a GPS (Global Positioning System) satellite and acquires latitude and longitude data of the current position. The positioning time of the positioning unit 12 is controlled by the positioning control unit 14. The measured latitude / longitude data is output to the positioning control unit 14.

  The positioning control unit 14 instructs the positioning unit 12 to perform positioning at least once between the movement time intervals. For example, it may be the time when it is determined that “the end of the travel time section”. Then, when the single hit is detected by the hit number detection unit 104, the positioning control unit 14 associates the positioning position information with the identifier representing the hit. Then, the batting identifier and position information are output to the display control unit 16. Thereby, a rough position at the time of hitting can be specified.

  The course map storage unit 15 accumulates map information of the golf course. Based on the current position instructed from the display control unit 16, the course map information is output to the display control unit 16.

  The display control unit 16 inputs current position information from the positioning control unit 14. Further, the display control unit 16 outputs the current position information to the course map storage unit 15 and acquires the course map information of the current position. Then, the display control unit 16 displays the current position on the map and displays the number of strokes output from the number-of-stroke determination unit 10. Further, not only the current position but also the position where the ball has been hit in the past can be displayed on the map. These images are output to the display unit 13.

  The display unit 13 displays an image from the display control unit 16. The player can grasp the current position and the number of strokes by visually recognizing the display unit 13 of the mobile terminal 1.

  The hit number determination unit 10 includes a vertical direction acceleration calculation unit 101, a moving time section detection unit 102, a hit candidate detection unit 103, a hit detection unit 104, and a hit number counting unit 106. Hereinafter, these functional components will be described in detail.

[Vertical acceleration calculation unit 101]
The vertical acceleration calculation unit 101 calculates vertical acceleration using acceleration data. The vertical acceleration and the horizontal acceleration are orthogonal to each other.

  FIG. 7 is a graph of the vertical acceleration according to the elapsed time.

  According to FIG. 7, the upper side of the vertical acceleration represents a vertically downward direction, and the lower side represents a vertically upward direction. In addition, the change in vertical acceleration has a periodicity that coincides with walking. Here, the maximum point of vertical downward acceleration represents the time when the body falls, that is, the time when the foot that has left the ground touches the ground. On the other hand, the maximum point of vertical upward acceleration represents the time when the body is raised, that is, the time when the foot is raised. Further, between the minimum points of the vertical downward acceleration, that is, between the maximum points of the vertical upward acceleration, represents one step of the player.

  First, the gravity vector G is calculated based on the acceleration for each axis output from the acceleration sensor. Note that gravity itself cannot be detected.

The gravity vector G is expressed as follows for each of the x-axis, y-axis, and z-axis.
Gravity vector G: G = (g _x , g _y , g _z )

  First, the gravity vector G is calculated. It is difficult to accurately determine the gravitational direction of the mobile terminal during walking even when using acceleration data. Therefore, the direction of the vector of the sum of the accelerations of each axis is regarded as the direction of gravity using a large number of x-axis, y-axis and z-axis acceleration data detected in a predetermined time range.

The acceleration of each i-th axis is expressed as follows.
x-axis acceleration: ACC _x [i]
y-axis acceleration: ACC _y [i]
z-axis acceleration: ACC _z [i]
The sum of n pieces of acceleration data is expressed as follows.
ACCS _x = Σ _{i = 1} ^N ACC _x [i]
ACCS _y = Σ _{i = 1} ^N ACC _y [i]
ACCS _z = Σ _{i = 1} ^N ACC _z [i]
The gravity vector G is expressed as follows.
G = (g _x , g _y , g _z ) = (ACCS _x , ACCS _y , ACCS _z )

Next, the downward unit vector is expressed as follows.
Downward unit vector e _Down : e _Down = (e _Dx , e _Dy , e _Dz )
Further, the acceleration data is expressed as follows.
A = (A _x , A _y , A _z )

When the gravity vector G is used, each unit vector is expressed as follows.
Downward unit vector e _Down : e _Down = G / | G |
×: Cross product (vector product, outer product)

The acceleration vector in each direction is calculated by taking the inner product of the acceleration vector A with respect to the unit vector e in each direction.
Vertical downward acceleration: A _D = e _Dx × A _x + e _Dy × A _y + e _Dz × A _z

As described above, the vertical acceleration calculation unit 10 calculates the gravity vector G based on the triaxial acceleration data output from the acceleration sensor in advance, and calculates the vertical downward unit vector e _Down using G / | G |. Keep it. Then, the vertical acceleration is calculated based on the triaxial acceleration data output from the acceleration sensor and the vertical downward unit vector e _Down .

[Movement time section detection unit 102]
The movement time section detection unit 102 recognizes the maximum point of vertical upward acceleration (or the minimum point of vertical downward acceleration) as the walking timing. Then, the walking timing generated by the walking motion of the pedestrian is detected. For example, according to FIG. 7, every time the vertical downward acceleration becomes a minimum point, the walking timing is output to the movement time interval detection unit 102. It should be noted that a local maximum point can be used instead of the local minimum point of vertical downward acceleration.

  Based on the walking timing, it is possible to detect a plurality of moving time sections that coincide with the walking cycle. The vertical acceleration during walking movement has periodicity. Therefore, the section where the periodicity is observed can be detected as walking. In order to prevent erroneous determination due to temporary vibration, when a certain number of walking timings are detected, it may be determined as “start of a moving time section by walking”. For example, a determination threshold value such as “start a movement time section when five or more walking timings continue” is set.

  In addition, when the walking timing is not detected for a certain period of time, it may be determined as “end of travel time section”. In general, it is known that human walking is about 120 steps / minute. That is, the time interval of walking timing is about 0.5 seconds. When the walking timing that is sufficiently longer than that is not detected, it is determined that “the end of the moving time section”. For example, a determination threshold value such as “when the walking timing is not detected for 1 second, the movement time section ends” is set.

[Battery candidate detection unit 103]
The hit candidate detection unit 103 has two methods for detecting hit candidate time points.
(Method 1) An acceleration having a magnitude equal to or larger than a predetermined threshold is detected as a hitting candidate time point. At the time of hitting, it is based on the fact that a large acceleration accompanying the hitting is observed.

(Method 2) When a set of vectors based on the posture that the player holds in the club before hitting is detected from the set of acceleration vectors of each axis, it is detected as a hitting candidate time point. It is possible to assume a subsequent hitting point after detecting a “holding point” from the relationship of acceleration of each axis.

  FIG. 8 is a graph showing the acceleration of each axis from when the player is holding to hitting.

  The acceleration of each axis detected by hitting varies greatly from the tee to the cup depending on the distance to which the ball is thrown and the ground condition. According to the graph of FIG. 8, the change in the acceleration during the “reading” time and the change in the acceleration during the “hitting” time in S1 (tee shot) and S4 (putting) are shown. The acceleration of each axis is detected by the local coordinate system. Here, S1 and S4 are greatly different with respect to the change in acceleration during the “hitting” time. In the tee shot, the change in acceleration is large, whereas in the putting, the change in acceleration is small.

  Therefore, according to the present invention, attention is paid to the change in acceleration during the “reading” time. Here, the aspect of S1 and S4 is similar about the change of the acceleration of the "reading" time. This is because the face of the golf club is positioned close to the ground with the legs open so that the ball is in front of the body. Become. That is, the hit candidate detection unit 103 does not detect “hit” but can detect it as “hit candidate time point” by detecting “position”.

  FIG. 9 is a graph showing the acceleration of each axis when the player is “standing” or “standing”.

According to FIG. 9, the acceleration of each axis can be classified according to the posture of the body depending on whether it is “standing” or “standing”. For example, the case of “standing” and the case of “standing” can be expressed by the following conditions.
Paddress: A set of postures (vectors) when “ready”
Pstand: A set of postures (vectors) when “standing” ps: postures (vectors) detected by sensors
ps · p = ps _x · p _x + ps _y · _py + ps _z · p _z (inner product)
max: maximum value [when _ready ] max _p∈Paddress (ps · p)> φ ₁ φ ₁ : threshold [when standing] max _p∈Pstand (ps · p)> φ ₂ φ ₂ : threshold

The case of “standing” and the case of standing can be determined under any of the following conditions.
(Decision 1) max _p∈Paddress (ps · p)> φ ₁
(Decision 2) max _p∈Paddress (ps · p)> max _p∈Pstand (ps · p)

[Blow detection unit 104]
The hit detection unit 104 detects a single hit when one or more hit candidate time points are detected between the movement time intervals. Of course, if no hitting candidate point is detected, it is not counted as zero. As a reason to detect hitting candidate time points between moving time sections,
(Condition 1) “Do not hit the ball while the ball is moving to a stationary point”
Based on that.
In addition, when one or more hitting candidate time points are detected, the reason for detecting as one hit is as follows:
(Condition 2) “Do not hit the ball twice at the same point”
Based on that.

[Strike Count Unit 106]
The hit count unit 106 counts and records the number of hits detected. It is also preferable to record not only the number of strokes but also the time and position.

  FIG. 10 is a screen transition diagram displayed on the display of the portable terminal when playing in one hole.

  FIG. 10 shows the transition of the screen associated with FIG. 1 (S1 to S4). In S1, the player resets the hit count and hits the first hit. Next, in S2, when the player hits the second hit, the number of hits 1 has already been counted. Next, in S3, when the player hits the third hit, the number of hits 2 has already been counted. Next, in S4, when the player hits the fourth hit, the number of hits 3 has already been counted. Finally, when the hole is finished, 4 hits are counted.

  As described above in detail, according to the portable terminal, the program, and the method of the present invention, it is possible to determine the number of hits as accurately as possible using the acceleration sensor mounted on the portable terminal possessed by the player. .

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

DESCRIPTION OF SYMBOLS 1 Portable terminal 10 Strike number determination part 101 Vertical direction acceleration calculation part 102 Movement time area detection part 103 Strike candidate detection part 104 Strike detection part 105 Strike count part 11 Acceleration sensor 12 Positioning part 13 Display part 14 Positioning control part 15 Course map memory | storage part 16 Display controller

Claims (8)

A portable terminal that counts the number of shots of a ball using an acceleration sensor that outputs acceleration data to be possessed by a golf player,
Vertical acceleration calculation means for calculating vertical acceleration from the acceleration data;
A moving time interval detecting means for detecting a plurality of moving time intervals during walking with a maximum point (or minimum point) of vertical upward acceleration as a walking timing;
A hit candidate detection means for detecting a hit candidate time point from the change in the vertical acceleration or the acceleration data;
A hit detecting means for detecting one hit when one or more hitting candidate time points are detected between the moving time intervals excluding the moving time interval;
A portable terminal comprising: a hit number counting means for counting the number of hits detected.   The portable terminal according to claim 1, wherein the hit candidate detection unit detects an acceleration having a magnitude greater than or equal to a predetermined threshold as a hit candidate point.   The hit candidate detection means detects from the set of acceleration vectors of each axis as a hit candidate time point when detecting a set of vectors based on the posture that the player holds in the club before hitting. The portable terminal according to claim 1, characterized in that: The hit candidate detection means determines the “ _ready ” posture under the following conditions: (1) max _p∈Paddress (ps · p)> φ ₁ φ ₁ : threshold or (2) max _p∈Paddress ( ps · p)> max _p∈Pstand (ps · p)
Paddress: A set of postures (vectors) when “ready”
Pstand: A set of postures (vectors) when “standing” ps: postures (vectors) detected by sensors
ps · p = ps _x · p _x + ps _y · _py + ps _z · p _z (inner product)
The mobile terminal according to claim 3, wherein max is a maximum value. The vertical acceleration calculating means includes
A gravity vector G is calculated in advance based on the triaxial acceleration data output from the acceleration sensor, and a vertical downward unit vector e _Down is calculated by G / | G |
5. The mobile terminal according to claim 1, wherein the vertical acceleration is calculated based on three-axis acceleration data output from the acceleration sensor and the vertical downward unit vector e _Down. . Positioning means for receiving positioning radio waves;
A positioning control means for controlling the positioning time with respect to the positioning means;
The positioning control means includes
Instructing the positioning means to perform positioning at least once between the travel time intervals,
When one hit is detected by the hit detection means, the positioning position information is associated with the identifier representing the hit,
The portable terminal according to any one of claims 1 to 5, wherein the batting identifier and position information are output to the display control means. A program for causing a computer mounted on a portable terminal to count the number of hits of a ball using an acceleration sensor that outputs acceleration data to be possessed by a golf player,
Vertical acceleration calculation means for calculating vertical acceleration from the acceleration data;
A moving time interval detecting means for detecting a plurality of moving time intervals during walking with a maximum point (or minimum point) of vertical upward acceleration as a walking timing;
A hit candidate detection means for detecting a hit candidate time point from the change in the vertical acceleration or the acceleration data;
A hit detection means for detecting one hit when one or more hitting candidate time points are detected between moving time sections;
A program which causes a computer to function as a hit number counting means for counting the number of hits detected. A method of counting the number of hits of a ball using a portable terminal having an acceleration sensor that outputs acceleration data to be possessed by a golf player,
Calculating vertical acceleration from the acceleration data;
Detecting a plurality of moving time sections during walking with a local maximum point (or minimum point) of vertical upward acceleration as a walking timing;
Detecting a hitting candidate time point from the change in the vertical acceleration or the acceleration data;
Detecting at least one hitting candidate time point between the movement time intervals as a single hit;
Counting the number of hits detected.

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