WO2006135160A1

WO2006135160A1 - System and method for analyzing golf swing motion

Info

Publication number: WO2006135160A1
Application number: PCT/KR2006/002128
Authority: WO
Inventors: Sungmo Kang
Original assignee: Ls Media Co., Ltd.
Priority date: 2005-06-17
Filing date: 2006-06-02
Publication date: 2006-12-21
Also published as: KR100620873B1

Abstract

Disclosed is a system and a method for extracting video frames corresponding to four or more preset standard motions including Address, Back Swing Top, Impact and Finish among the video frames of golf swing motions recorded by a video photographing device so as to compare them with standard motions, and to output them. According to the present invention, there is an advantage in that video frames corresponding to standard motions among the video frames of golf swing motions recorded through a video photographing device are extracted using a proportion table provided on the basis of sensors and statistic analysis so that a correspondence relation between the standard motions and the extracted video frames is made in a range of a small error rate, whereby a golfer can effectively compare/analyze their own motions with standard motions.

Description

SYSTEM AND METHOD FOR ANALYZING GOLF SWING MOTION

Technical Field

The present invention relates to a system and a method for analyzing golf swing motions, and more particularly to a system and a method for extracting video frames corresponding to four or more (hereinafter, referred to as ^Nλn") preset standard motions including Address, Back Swing Top, Impact and Finish among the video frames of golf swing motions recorded by a video photographing device so as to compare them with standard motions, and to output them.

Background Art

Golf recognized as a high-class sport has been gradually highlighted as a popular sport, and recognized as a sport being of great help to people's physical and mental health. A golf game generally consists of three or four rounds of eighteen holes depending on a game organization, and a golfer recording the minimum number of strokes through the golf game becomes the winner. Since golfers round so many holes, concentration, physical health and accuracy influence their chances for victory or defeat. Here, the accuracy depends on golf swing postures, and a desired accuracy and flying distance can be obtained only when an exact stroke is accomplished in a correct posture.

Thus, golfers, especially amateur golfers, carefully observe professional golfers' postures while watching a golf game in order to execute correct golf swing postures, and watch golf training broadcasts provided through television or the like to obtain information. However, since the golfers cannot directly compare their own swing postures through such methods, their effects are limited. Although the best method is to look to professional golfers for guidance on the ground where golf training is provided, this is a burden to the golfers in terms of costs. Further, the golfers should make an appointment with the professional golfers or wait for a long period of time to receive guidance, causing great inconvenience.

In order to solve these problems, there have been developed devices that can record golfer's swing postures to provide them in golf swing practice, and furthermore, provide video in which professional golfer's or expert's swing postures are recorded together with golfer's swing postures to compare them.

FIG. 1 is a view showing a schematic configuration of a golf trainer using conventional moving images.

As shown in FIG. 1, the golf trainer using conventional moving images includes a camera 100 that is a video photographing unit, a key operation unit 110, a main controller 120, a video recording unit 130, a video output unit 140, a money insertion unit 150 and a golf ball supply unit 160. Golfer's swing motions are photographed by using the camera 100, and the golfer's photographed video is recorded in the video recording unit 130, and also output to a main screen of the video output unit 140 under the control of the main controller 120.

Meanwhile, if the golfer inputs an operation instructions to the main controller 120 through the key operation unit 110 in advance so as to select a reference player, a kind of swing and the like, with which the golfer intends to compare, a reference player's swing motions, having been already stored in the video recording unit 130, are output as a comparison screen on a sub-screen of the video output unit 140.

At this time, if the golfer's swing motions are displayed on the main screen for a certain amount of time, the main screen is paused, and a reference player's swing motions are displayed on the sub-screen for a certain time. As such, the golfer's swing motions and the reference player' s swing motions are sequentially displayed on the main and sub-screens at a certain time interval.

Such a golf trainer using conventional moving images is of help to a golfer in obtaining correct swing postures by comparing their own swing motions with reference player's swing motions so as to correct their postures. However, the conventional moving image golf trainer has limits in the following viewpoints.

First, since the golfer's swing motions and the reference player' s swing motions are displayed with a certain time gap, the golfer cannot easily compare them at a glance. Although the golfer's swing motions and the reference player' s swing motions are simultaneously displayed on the main and sub-screens to overcome such a problem, it is difficult to catch differences between both the swing motions in the moving images composed of continuous motions.

Second, the golfer' s swing motions and the reference player' s swing motions are not displayed with synchronization. Even though appropriate matchings should have been made between the golfer's swing motions and the reference player's swing motions for better comparison, the conventional moving image golf trainer can not provide such matchings .

Disclosure of the Invention

Therefore, the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a system and a method for extracting video frames corresponding to four or more preset standard motions including Address, Back Swing Top, Impact and Finish among the video frames of golf swing motions recorded by a video photographing device so as to compare them with standard motions, and to output them.

According to an aspect of the present invention, there is provided a golf swing motion analyzing method for extracting 4 or more (hereinafter, referred to as "n") video frames corresponding to n preset standard motions containing an Address, a Back Swing Top, an Impact and a Finish among the video frames of golf swing motions recorded by using a video photographing device to analyze the golf swing motions in comparison with standard motions, comprising the steps of: (a) extracting video frames corresponding to the Address, the Back Swing Top, the Impact and the Finish among the video frames of the golf swing motions recorded by the video photographing device; (b) dividing the entire swing motion into an Address-to-Back Swing Top section, a Back Swing Top- to-impact section and an Impact-to-Finish section; (c) extracting (n-4) video frames of the remaining motions corresponding to the standard motions using a small section proportion table in which a progression time ratio between motions set for each of the sections divided in step (b) ; and (d) matching each of the n extracted video frames with an image of a correspondent standard motion.

In accordance with another aspect of the present invention, there is provided a golf swing motion analyzing system for extracting 4 or more (hereinafter, referred to as "n") video frames corresponding to n preset standard motions containing an Address, a Back Swing Top, an Impact and a Finish among the video frames of golf swing motions recorded by using a video photographing device to analyze the golf swing motions in comparison with the standard motions, comprising: a detection device for sensing an Address time point and an Impact time point as of swing, and calculating a swing tempo, a head speed, a swing locus and an impact point information derived from the swing locus; and an video analyzing device for extracting video frames respectively corresponding to the Address and the Impact among the video frames of golf swing motions received from the video photographing device by using the Address time point and the Impact time point received from the detection device after synchronizing the detection device with time, extracting video frames respectively corresponding to the Back Swing Top and the Finish by grasping a Back Swing Top time point and a Finish time point by using a large section proportion table in which there are displayed a temporal internal division ratio to the Back Swing Top time point and a temporal external division ratio to the Finish time point with the Address time point and the Impact time point as a reference for each kind of golf club, and extracting video frames respectively corresponding to (n-4) remaining standard motions using a small section proportion table in which a progression time ratio between motions set for each Address-to-Back Swing Top section, Back Swing Top-to-impact section and Impact-to-Finish section so as to output n extracted video frames together with images of the standard motions .

Brief Description of the Drawings

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a view showing a schematic configuration of a golf trainer using conventional moving images;

FIG. 2 is a view showing a feature in that golf swing motions are divided into 16 motions for each stage;

FIG. 3 is a flowchart illustrating a method for analyzing golf swing motions according to a preferred embodiment of the present invention;

FIG. 4 is a view showing an arrangement of a video photographing device and a sensor, which are attached to a golf base according to the preferred embodiment of the present invention;

FIG. 5 is a view showing a configuration of a system for analyzing golf swing motions according to the preferred embodiment of the present invention; and

FIG. 6 is a view showing an output result in a case of

~1 photographing from the front.

Best Mode for Carrying Out the Invention

Reference will now be made in detail to the preferred embodiment of the present invention. It should be noted that the similar components are designated by similar reference numerals although they are illustrated in different drawings. Also, in the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention.

FIG. 2 is a view showing a feature in that golf swing motions are divided into 16 motions for each stage. When a golfer swings as shown in FIG. 2a, a swing locus is drawn as shown in FIG. 2b. When the swing locus is divided into 16 motions, the name of respective motion is shown in FIG. 2c. The 16 motions are composed of 6 motions between Address and Back Swing Top, 3 motions between Back Swing Top and Impact, and 3 motions between Impact and

Finish, including Address, Back Swing Top, Impact and Finish.

A golf swing starts from Address, passes through Back

Swing, and reaches Back Swing Top. Thereafter, the golf swing passes through Down Swing, and reaches an Impact motion through which a golf ball is hit. After having passed through the Impact motion, the golf swing passes through a Follow Through motion, and reaches a Finish motion, so that one full swing is completed.

As described above, the present invention establishes standard motions for the respective 16 motions, and extracts video frames corresponding to the 16 standard motions among the video frames recoded by a video photographing device when a golfer make a swing so as to compare standard motions and their own motions by synchronizing them.

However, since golf swings have different swing tempo and speed for each person, the speed of a club head is not uniform from Address to Finish, and speed and acceleration are different depending on a posture, if the a full swing is simply divided using time as a reference to extract the 16 motions, an error occurs with the standard motions so that their own motions and the standard motions cannot be effectively compared.

Thus, a particular method is required to extract the video frames corresponding to the 16 standard motions among the video frames of golf swing motions, which are recorded by the video photographing device.

If a full swing is divided into an Address-to-Back Swing Top section, a Back Swing Top-to-impact section and an Impact-to-Finish section as the result of a statistic analysis, it can be seen that a fixed time proportion is made in progressing time between motions belonging to each of the sections. For example, a swing in the Back Swing Top- to-Impact section progresses in an order of Back Swing Top 8, Down Swing Start 9, First Down Swing 10, Second Down Swing 11 and Impact 12 as shown in FIG. 2b. Although time taken in progressing 8 to 9, 9 to 10, 10 to 11 and 11 to 12 is different for each person, a fixed proportion relation is made if a ratio of the time taken in the progression is analyzed.

Accordingly, time points of Address, Back Swing Top, Impact and Finish are grasped through a sensor or the like to automatically extract video frames respectively corresponding to Address, Back Swing Top, Impact and Finish, the entire swing motion is divided into an Address-to-Back Swing Top section, a Back Swing Top-to-impact section and an Impact-to-Finish, and video frames corresponding to the rest of the motions are then extracted through a proportion table (hereinafter, referred to as a "small section proportion table") indicating a time ratio with respect to progressing time between the motions obtained from the statistic analysis for each of the sections, so that the video frames corresponding to the 16 standard motions can be extracted.

This will be described in detail below with reference to FIG. 3.

The reason why the standard motions are set as 16 motions is that, in a case where the standard motions and the golfer's video frames corresponding thereto are output on paper with size of A4, there is set a proper number in which the golfer can fully compare their own motions and the standard motions while not degrading resolution. However, the present invention is not limited thereto but may arbitrarily set 4 or more motions including Address, Back Swing Top, Impact and Finish.

FIG. 3 is a flowchart illustrating a method for analyzing golf swing motions according to a preferred embodiment of the present invention.

First, 4 or more standard motions, including Address, Back Swing Top, Impact and Finish, are set (S300). Although the number of standard motions may be arbitrarily set, it is preferably set as 16 motions as described above.

If a golfer gets on a golf base and then swings, Address and Impact time points are sensed through sensors mounted in a plurality of lines by a plurality of sensors per line on a mat of the golf base so as to extract video frames respectively corresponding to the Address and Impact time points among the video frames of golf swing motions recorded through a video photographing device (S310) . As the results of a statistic analysis, Back Swing Top and Finish time points respectively are located at internal and external points in accordance with a fixed time proportion with the Address and Impact time points as references depending on the kind of golf club used, such as a driver and an iron. For example, assuming that the Address and Impact time points are respectively 0% and 100% in a case of the driver, the Back Swing Top time point is located at a time point (7:3 internal point of the Address and Impact time points) approximately 70% between the Address and Impact time points, and the Finish time point is located at a time point (3:1 external point of the Address and Impact time points) approximately 150% between the Address and Impact time points. Thus, there is established a proportion table (hereinafter, referred to as a "large section proportion table") indicating a temporal internal division ratio up to the Back Swing Top time point and a temporal internal ratio up to the Finish time point, with the Address and Impact time points as references for each kind of golf club, and the Back Swing Top and Finish time points are derived from the large section proportion table in accordance with the kind of golf club so as to extract the video frames respectively corresponding to Back Swing Top and Finish (S320) .

Although it is effective to use a sensor even at the Back Swing Top and Finish time points for precise measurement, there is a limit in measuring with the sensor since the golf club does not face toward the ground, and the location of the golf club is not uniform in the Back Swing Top and Finish motions. Further, it is inconvenient and expensive to mount the sensor. Thus, the Back Swing Top and Finish time points are not measured through the sensor but derived from the large section proportion table statistically yielded as described above.

In a bid to boost the accuracy of the derivation, the inventive method may further include a step of providing information data on a head speed, a swing locus and a head impact point, and correction data on the Back Swing Top and Finish time points in accordance with a skill level of each golfer based on the fact that the head speed, the swing locus and the like are different depending on the golfer' s level, and determining the golfer's level with the head speed, the swing locus, and the impact point information derived from the swing locus, which are measured by the sensors mounted in a plurality of lines by a plurality of sensors per line, so as to correct the Back Swing Top and Finish time points yielded through the large section proportion table.

Further, in a case where two or more video frames corresponding to Back Swing Top or Finish, which are obtained through the aforementioned derivation method, are extracted, the accuracy can be more enhanced through image processing. That is, the image frame extracted using a motion detecting technique through the image processing is compared with an adjacent image frame so that a frame with the smallest image change rate can be selected. Since Back Swing Top and Finish contain instantaneous stop motions, the accuracy of the derivation can be more raised if such image processing is used. If the Address, Back Swing Top, Impact and Finish time points are yielded through steps S310 and S320, the entire swing is divided into an Address-to-Back Swing Top section, a Back Swing Top-to-impact section and an Impact-to-Finish section, and the video frames respectively corresponding to the 12 left standard motions are extracted through the small section proportion table statistically yielded as described above (S330) .

If the video frames respectively corresponding to the 16 preset standard motions among the video frames of the golf swing motions recorded by the video photographing device through the method described above, the 16 extracted video frames and images of standard motions corresponding thereto are matched with each other so as to output them together (S340) .

An output method is set to be a method in that 16 video frames extracted or displayed on a monitor screen and images of standard motions respectively corresponding thereto are output together on a sheet of paper with a fixed size (e.g., A4 paper) so that a golfer can easily compare/analyze the standard motions and their own extracted motions.

A system for analyzing golf swing motions, which can implement the aforementioned method for analyzing golf swing motions, will now be described. FIG. 4 is a view showing an arrangement of a video photographing device and a sensor, which are attached to a golf base according to the preferred embodiment of the present invention.

As shown in FIG. 4a, the video photographing devices, such as CCD cameras, are respectively postureed in front and to a side to record golfer's swing images, and transmit recorded video frames to a video analyzing device to be described later in real time. The video photographing device records 30 or 60 frames per second depending on performance thereof. However, the arrangement of the video photographing devices and the number thereof may vary, and the number of frames per second may be changed depending on the performance of the video photographing device.

The sensors are mounted on a mat of the golf base, and FIG. 4b is a view showing a detailed arrangement of the sensors.

The sensors are composed of a total of 3 lines. 8 sensors are arranged in a first line, 15 sensors are arranged in a second line, and 15 sensors are arranged in a third line. The sensors are arranged in a plurality of lines by a plurality of sensors per line in order to precisely grasp the head speed, a swing locus and the like. That is, the head speed can be measured from a difference of time when the sensors in each of the sensor lines sense the passage of the head, and the swing locus can be obtained when sensor in each of the sensor lines senses a movement of the head. Further, impact point information can be derived from the swing locus. Furthermore, a golfer frequently performs a waggling routine before making a real swing, and thus, the 3 sensor lines are arranged to identify such a waggle motion from a real swing. For instance, when the head sequentially passes the first and second sensor lines in a swing, and passes again all the first, second and third sensor lines after a time interval, a controller connected to the sensors recognizes it as a real swing.

However, the aforementioned number of sensor lines and sensors arranged in each of the sensor lines is merely an example, and may be variously modified within the number of sensors that can be supported by the controller connected thereto.

FIG. 5 is a view showing a configuration of a system for analyzing golf swing motions according to the preferred embodiment of the present invention.

As shown in FIG. 5, the system for analyzing golf swing motions, according to the preferred embodiment of the present invention, includes a video photographing device 500, a detection device 510 and a video analyzing device 520.

Since the video photographing device 500 has been described above, the detection device 510 and the video analyzing device 520 will be described below.

The detection device 510, according to the preferred embodiment of the present invention, performs the function of sensing Address and Impact time points and calculating a swing tempo, a head speed, a swing locus and impact point information of a head, which is derived from the swing locus. More specifically, the detection device 510, according to the preferred embodiment of the present invention, includes a sensor 511, a key input unit 512, a first memory

513, a first controller 514, a first timing controller 515 and a first communication unit 516.

As described above, the sensor 511 is composed of a plurality of lines, with a plurality of sensors per line, and performs the function of sensing that the head of a golf club passes over the sensors so as to transmit it to the first controller 514.

The key input unit 512 functions to receive a system operation instruction input from a golfer, including the kind of golf club, such as a driver or an iron, which will be used by the golfer and a swing start.

If a key input signal generated by a golfer informing a swing start is received, the first timing controller 515 performs the function of generating a synchronization signal for synchronizing time with the video analyzing device 520, and transmits it to the video analyzing device 520 through the first communication unit 516 so as to synchronize time between the detection device 510 and the video analyzing device 520. The first controller 514 receives a motion sensing signal of the club head from the sensor 511 of the second sensor line to grasp Address and Impact time points under the control of the first timing controller 515. Further, the first controller 514 performs the function of determining which sensor in each of the sensor lines transmits the operation sensing signal to yield swing locus and impact point information of the head derived therefrom, calculating a head speed through a difference of time when the operation sensing signal is received from each of the sensor lines, and controlling operations of other peripheral devices. The first memory 513 stores Address and Impact time points, a swing locus, impact point information of the head, head speed and the kind of golf club used, received from the key input of the golfer, which are yielded or calculated in the first controller 514. The first communication unit 516 performs the function of transmitting the synchronization signal generated from the first timing controller 515 under the control of the first controller 514, and transmitting data or the like, which is stored in the first memory 513, to the video analyzing device 520 under the control of the first controller 514 if the first controller 514 determines that the swing is ended.

The video analyzing device 520, according to the preferred embodiment of the present invention, receives a synchronization signal input from the detection device 510 to synchronize the detection device 510 with time and then extracting video frames respectively corresponding to Address and Impact from among the video frames of golf swing motions received from the video photographing device 500 using Address and Impact time points received from the detection device 510, extracting video frames respectively corresponding to Back Swing Top and Finish by grasping Back Swing Top and Finish time points through the preset large section proportion table depending on the kind of golf club, and extracting video frames respectively corresponding to the 12 remaining standard motions through the small section proportion table preset for each Address-to-Back Swing Top section, Back Swing Top-to-impact section and Impact-to- Finish section so as to output the output the n extracted video frames together with images of the standard motions. More specifically, the video analyzing device 520, according to the preferred embodiment of the present invention, includes a second communication unit 521, a second controller 522, a second timing controller 523, a second memory 524 and an output unit 525. The second communication unit 521 performs the function of receiving video frames of swing motions recorded in real time from the video photographing device 500, and receiving an impact point of a head derived from a synchronization signal, Address and Impact time points, a swing tempo, a head speed, swing locus, impact point information of a head derived from the swing locus and information on the kind of golf club used from the detection device 520.

The second timing controller 523 performs the function of receiving an input synchronization signal received from the detection device 510 to synchronize the detection device 510 with time.

The second memory 524 stores the large section proportion table for grasping the images of the 16 standard motions and Back Swing Top and Finish time points, and the small section proportion table set for each Address-to-Back Swing Top section, Back Swing Top-to-impact section and Impact-to-Finish section. Further, the second memory 524 stores video frames of swing motions, which are received in real time from the video photographing device under the time control of the second timing controller 523 operated while being synchronized with the first timing controller 515 of the detection device 510, together with information on time when each of the video frames is received.

Furthermore, the second memory 524 may additionally store head speed data for each golf level, swing locus data, impact point information data of a head, Back Swing Top and

Finish time points correction data, which are required to more precisely derive Back Swing Top and Finish time points.

The second controller 522 performs the function of extracting video frames (video frames respectively corresponding to Address and Impact) , which contain time information corresponding to Address and Impact time points received from the detection device 510, from the second memory 524, extracting video frames respectively corresponding to Back Swing Top and Finish by grasping Back Swing Top and Finish time points through the large section proportion table, and extracting video frames respectively corresponding to the 12 remaining standard motions through the small section proportion table preset for each Address- to-Back Swing Top section, Back Swing Top-to-impact section and Impact-to-Finish section. Preferably, the second controller 522 may further include the function of comparing the head speed of a golfer, swing locus and impact point information of a head, which are received from the detection device 510, with data for each level, which has previously been stored in the second memory 524, to determine the level of the golfer, and correcting Back Swing Top and Finish time points derived through the large section proportion table using Back Swing Top and Finish time point correction data, so that accuracy of derivation can be raised. Further, in a case where the number of video frames corresponding to Back Swing Top and Finish, which are extracted in a manner described above, is 2 or more, the second controller 522 may further include the function of comparing video frames extracted using image processing with adjacent video frames so as to select the video frame with the least image change rate. The output unit 525 performs the function of outputting 16 video frames extracted by the second controller 522 together with the standard motion images respectively corresponding to the 16 video frames. FIG. 6 is a view showing an output result in a case of photographing from the front.

As shown in FIG. 6, an image of the standard motion corresponding to each video frames is output together at a lower portion of each of the 16 extracted video frames so as to easily compare golfer's motions with standard motions.

Such an output may be displayed on a computer monitor and printed on paper to be provided to the golfer so that the golfer can compare/analyze their own motions with the standard motions regardless of places. Although only a case of photographing from the front is shown in Fig. 6, the result with the same format is also output in a case of photographing from a side.

As described above, according to the present invention, there is an advantage in that video frames corresponding to standard motions among the video frames of golf swing motions recorded through a video photographing device are extracted using a proportion table provided on the basis of sensors and statistic analysis so that a correspondence relation between the standard motions and the extracted video frames is made in a range of a small error rate, whereby a golfer can effectively compare/analyze their own motions with standard motions.

Further, there is an advantage in that preset standard motions and golfer' s swing motions corresponding thereto are output on a screen or paper as still images so that a golfer can easily and simply compare/analyze differences between their own motions with the standard motions.

Although a preferred embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1. A golf swing motion analyzing method for extracting 4 or more (hereinafter, referred to as "n") video frames corresponding to n preset standard motions containing an Address, a Back Swing Top, an Impact and a Finish among the video frames of golf swing motions recorded by using a video photographing device to analyze the golf swing motions in comparison with standard motions, comprising the steps of: (a) extracting video frames corresponding to the Address, the Back Swing Top, the Impact and the Finish among the video frames of the golf swing motions recorded by the video photographing device;

(b) dividing the entire swing motion into an Address- to-Back Swing Top section, a Back Swing Top-to-impact section and an Impact-to-Finish section;

(c) extracting (n-4) video frames of the remaining motions corresponding to the standard motions using a small section proportion table in which a progression time ratio between motions set for each of the sections divided in step (b) ; and

(d) matching each of the n extracted video frames with an image of a correspondent standard motion.

2. The method as claimed in claim 1, wherein step (a) includes the sub-steps of: (al) sensing an Address time point and an Impact time point by using a plurality of sensors mounted on a mat of a golf base so as to extract video frames respectively corresponding to the Address and the Impact; and (a2) deriving Back Swing Top time point and Finish time point by using a large section proportion table in which there are displayed a temporal internal division ratio to the Back Swing Top time point and a temporal external division ratio to the Finish time point with the Address time point and the Impact time point as a reference for each kind of golf club, so as to extract video frames respectively corresponding to the Back Swing Top and the Finish.

3. The method as claimed in claim 2, wherein step (a2) has the sub-steps of:

(a21) deriving the Back Swing Top time point and the Finish time point by using the large section proportion table; (a22) determining the level of a golfer from head speed, swing locus and impact point information derived from the swing locus, which are measured using the plurality of sensors, and correcting the Back Swing Top time point and the Finish time point in accordance with the level; and (a23) extracting video frames respectively corresponding to the Back Swing Top and the Finish by using the Back Swing Top time point and the Finish time point corrected in step (a22) .

4. The method as claimed in claim 2 or 3, wherein, in a case where 2 or more video frames respectively corresponding to Back Swing Top and Finish are extracted, the video frame with the least image change rate is selected using an image processing technique.

5. The method as claimed in claim 1, further comprising a step of (e) displaying or outputting the n video frames and images of the n standard motions, which are matched with each other, on a screen or paper after step (d) .

6. The method as claimed in claim 1, wherein n is 16 containing 6, 3 and 3 motions in the Address-to-Back Swing Top section, the Back Swing Top-to-impact section and the Impact-to-Finish section, respectively.

7. A golf swing motion analyzing system for extracting 4 or more (hereinafter, referred to as "n") video frames corresponding to n preset standard motions containing an Address, a Back Swing Top, an Impact and a Finish among the video frames of golf swing motions recorded by using a video photographing device to analyze the golf swing motions in comparison with the standard motions, comprising: a detection device for sensing an Address time point and an Impact time point as of swing, and calculating a swing tempo, a head speed, a swing locus and an impact point information derived from the swing locus; and an video analyzing device for extracting video frames respectively corresponding to the Address and the Impact among the video frames of golf swing motions received from the video photographing device by using the Address time point and the Impact time point received from the detection device after synchronizing the detection device with time, extracting video frames respectively corresponding to the Back Swing Top and the Finish by grasping a Back Swing Top time point and a Finish time point by using a large section proportion table in which there are displayed a temporal internal division ratio to the Back Swing Top time point and a temporal external division ratio to the Finish time point with the Address time point and the Impact time point as a reference for each kind of golf club, and extracting video frames respectively corresponding to (n-4) remaining standard motions using a small section proportion table in which a progression time ratio between motions set for each Address-to-Back Swing Top section, Back Swing Top-to-impact section and Impact-to-Finish section so as to output n extracted video frames together with images of the standard motions.

8. The system as claimed in claim 7, wherein the detecting device comprises: a key input unit for inputting instructions containing a kind of golf club used and swing start; a first communication unit for transmitting/receiving data or signals with the video analyzing device; a first timing controller for generating a synchronization signal for synchronizing time with the video analyzing device, and transmitting the synchronization signal to the video analyzing device through the first communication unit so as to synchronize the video analyzing device with time if a key input signal input by a golfer to inform the swing start is received; a sensor unit composed of a plurality of lines, each having a plurality of sensors per line, to sense motions of the head; a first controller for yielding the Address time point and the Impact time point from an operation sensing signal of the head input from the sensor unit under the time control of the first timing controller, and calculating the swing tempo, the head speed, the swing locus and the impact point information of the head derived from the swing locus; and a first memory for storing the Address time point and the Impact time point, the swing locus, the impact point information of the head, the head speed and a kind of golf club received from the key input of the golfer, which are yielded or calculated in the first controller.

9. The system as claimed in claim 7 or 8, wherein the video analyzing device includes: a second communication unit for receiving video frames of golf swing motions recorded from the video photographing device, and receiving a synchronization signal, the Address time point and the Impact time point, the swing tempo, the head speed, the swing locus, the impact point information of a head derived from the swing locus and information on the kind of golf club used from the detection device; a second timing controller for receiving the synchronization signal input from the second communication unit to synchronize the detection device with time; a second memory for storing the respective video frames of the golf swing motions received in real time from the video photographing device together with received time information under the control of the second timing controller, and storing n images of the standard motions, the large section proportion table and the small section proportion table; a second controller for extracting video frames containing time information respectively corresponding to the Address time point and the Impact time point from the second memory, extracting video frames respectively corresponding to the Back Swing Top and the Finish after grasping the Back Swing Top time point and the Finish time point using the large section proportion table, and extracting video frames respectively corresponding to (n-4) remaining standard motions using the small section proportion table; and an output unit for outputting the n video frames extracted from the second controller together with images of the standard motions respectively corresponding to the n video frames.

10. The system as claimed in claim 9, wherein the second controller further comprises the function of determining the level of the golfer by analyzing the head speed, the swing locus and the impact point information received the detection device in comparison with an head speed data, swing locus data, impact point information data, Back Swing Top correction data and Finish correction data, which have been previously stored in accordance with each golf level in the second memory, and then correcting the Back Swing Top time point and the Finish time point by using the Back Swing Top correction data and the Finish correction data corresponding to the level.

11. The system as claimed in claim 9, wherein, in a case where the number of extracted video frames respectively corresponding to the Back Swing Top and the Finish is 2 or more, the second controller further comprises the function of extracting the video frame with the least image change rate by using an image processing technique.

12. The system as claimed in claim 10, wherein, in a case where the number of extracted video frames respectively corresponding to the Back Swing Top and the Finish is 2 or more, the second controller further comprises the function of extracting the video frame with the least image change rate by using an image processing technique.