JP2002090380A - Velocity measuring device for swinging object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a velocity measuring device for a swinging object capable of conducting remote measurement without working on the object. SOLUTION: The swinging region of an object 11 swung by a person 10 is photographed with the passage of time to obtain image information 20, information on the object 11 is extracted from the image information 20 to find the position of a specified measuring point 19 on the object 11, and the swinging velocity of the object 11 as velocity of a measuring point 19 is found based on the variation with time of a position of the measuring point 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the speed of a swing object.

[0002]

2. Description of the Related Art In recent years, sports have been analyzed from a scientific point of view, and the speed of an object such as a bat and a racket that is swung by a human has been measured.

[0003] As a method for realizing this, there are an ultrasonic type apparatus utilizing the Doppler effect, a marker tracking type apparatus for placing a marker on a bat or a racket and tracking the marker,
There are a direct type device in which a speed detector is directly attached to a bat, a racket, or the like, or a light blocking type device in which a plurality of optical paths are installed on a track of a bat, a racket, or the like, and a time difference between the light paths is detected.

[0004]

However, these devices cannot measure the speed of a bat or racket during a game. For example, an ultrasonic device using the Doppler effect needs to be installed several meters in front of the batter, and such a device is not allowed to be installed during a game according to rules. In addition, marker tracking type devices and direct type devices are those that modify bats and rackets, etc.
Use of such a bat or racket in a game is not allowed under the rules. Furthermore, in the light blocking type device, it is difficult to distinguish between light blocking by a bat or a racket and light blocking by a ball, and it is necessary to install a device near a player swinging a bat or the like, Not applicable during a match.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a speed measurement apparatus for a swing object that can remotely measure without changing the object.

[0006]

According to the present invention, there is provided an apparatus for measuring the speed of a swing object, comprising: a photographing means for photographing a swing area of an object swung by a person over time and outputting image information; Extracting means for extracting the information of the object, a predetermined measuring point is set for the information of the extracted object, and a measuring point obtaining means for obtaining the position thereof; and It is characterized by comprising speed acquisition means for acquiring the speed, and output means for outputting the acquired speed as the swing speed of the object.

Thus, the swing area of the object is photographed over time to obtain image information, the object information is extracted from the image information, and the position of a predetermined measurement point on the object information is obtained. The swing speed of the object as the speed of the measurement point is obtained based on the temporal change of the position of the point.

[0008] Further, the extracting means is configured to calculate the difference between the image information at a certain point in time and the newer image information, and between the image information at a certain point in time and the older image information with respect to the corresponding pixels. And a difference means for binarizing the difference value with a predetermined threshold value to obtain a binarized image, and a logical product calculation for obtaining a logical product image by taking a logical product of the binary images Means is preferably provided, and the object information in the AND image is information of the object extracted from the image information at a certain point in time.

As described above, by taking the difference between two pieces of image information photographed at different times and binarizing them, if the corresponding two pixels are both background pixels, the two
Since the data of the two pixels is almost the same, the background information in the two image information is removed from the binarized image and the corresponding 2
If one of the pixels is a background and the other is an object, the data of the two pixels are different, so that the object information in each image information is extracted as a binary image without being removed. Furthermore, the logical product between the adjacent binarized images obtained between the image information at a certain time and the newer image information and between the image information at a certain time and the older image information, respectively. , The object information included in each binarized image and photographed at a certain point in time is extracted as a logical product image.

It is preferable that the extracting means includes a shadow removing means for recognizing a shadow in the image information and preventing the shadow from being extracted into a logical product image. In some cases, a shadow that follows the movement of the object may be formed in the image information, and this shadow is extracted in a binary image or a logical product image. Therefore, the shadow that follows the movement of the object is removed from the logical product image by recognizing and excluding the shadow by the extraction means, thereby preventing the shadow from being erroneously recognized as a bat.

[0011] Further, the difference means comprises two pixels respectively corresponding to the image information at a certain point in time and the image information newer than this, and between the image information at a certain point in time and the older image information. If at least one of the brightness value and the saturation value is greater than or equal to a predetermined value, it is determined that there is no shadow and a difference value is obtained for each component of the corresponding two pixels to obtain a difference value. If the brightness value and the saturation value of at least one of the pixels are less than the predetermined value, it is determined that there is a shadow, and the shadow removing unit performs a difference based on the hue values of the corresponding two pixels to obtain a difference value. It is preferable to binarize the difference value with a predetermined threshold to obtain a binarized image.

Thus, when at least one of the two corresponding pixels is a shadow, the difference is made based on the hue value of each pixel. At this time, the two pixels are divided into a shadowed background and a non-shadowed background, or If the shaded backgrounds are the same, the hue values of the two pixels are substantially the same, so that the background including the shadow is removed from the binarized image, while the two pixels are the same as the shaded background. If the object is not a shadow, the non-shadowed background and the shadowed object, or the shadowed background and the shadowed object have different hue values, this object is extracted as a binary image. Is done.

The image processing apparatus further includes a synthesizing unit for synthesizing the time-series data of the object information in the logical product image extracted by the extracting unit into one image to obtain a synthesized image. It is preferable to perform processing on the object information. As a result, measurement point acquisition is performed at a higher speed than when measurement point acquisition is performed on the logical product image at each time.

The combining means combines the time series data of the object information with the time information at which the object information was photographed and combines them into one image, and recognizes the time at which the object information was photographed on the combined image. Preferably it is possible. Thus, when the images are combined into one image, the photographing time of each object information on the combined image is easily recognized, and the measurement points are acquired at high speed.

Further, it is preferable that the measurement point acquiring means sets a tip of the object to be swung as a measurement point. Thereby, the speed of the tip end of the object that is the highest speed is measured as the swing speed.

The measurement point obtaining means includes a center line obtaining means for obtaining an axial center line of the extracted object, and a point which is the farthest from the position of the person among points where the center line and the object overlap. It is preferable to include a farthest point acquisition unit that acquires the measurement point as the measurement point at the tip of the point. Thereby, the measurement point at the tip of the object is easily obtained.

The output means may further include a time-dependent change in the position of the measurement point acquired by the measurement point acquisition means,
The locus of the measurement point of the object may be output. As a result, the swing trajectory of the object is output, and the swing trajectory is recognized by, for example, a person who swings or a coach.

A swing detecting means for monitoring a predetermined area of image information photographed by the photographing means, activating the extracting means when a change of a predetermined amount or more occurs, and stopping the extracting means after a predetermined time; Is preferred. Thereby, the measurement of the swing speed is automatically started.

Further, before a predetermined time before the extraction means is activated,
There may be provided timing notifying means for generating at least one of sound and light and notifying a person of the activation timing of the extracting means. Thereby, the timing of the start of the swing speed measurement is notified to the person, and the person can swing accordingly.

When the object is a bat, the speed of the bat swing is measured.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a swing object speed measuring device according to the present invention will be described in detail. In the description of the drawings, the same or corresponding elements will be denoted by the same reference characters, without redundant description.

FIG. 1 is a configuration diagram showing a swing object speed measuring apparatus according to the present embodiment. The swing object speed measuring device 1 according to the present embodiment is a device for measuring the speed of a bat (object) 11 on which a batter (person) 10 swings, and images a region where the batter 10 swings with time to obtain image information. Device (photographing means) 12 that obtains the image, and the analyzing device 1 that obtains the swing speed based on the information of the photographed image
5 and a display device 14 for displaying the analyzed result.

The photographing device 12 is 3 to 4 m above the batter 10.
2, the batter 10 is located near the center of the image information 20 to be captured, and the tip 19 of the bat 11 rotates around the batter 10 when swinging.
(Measurement points) are all included in the range of the image information 20, and the pitcher (not shown) is set so as to be located to the left of the image information 20 in the drawing. The image information 20 includes, in addition to the bat 11 and the batter 10, the background 24, such as the ground 25, the home base 22, and the like, and in some cases, the shadow 23 of the batter 10 and the shadow 26 of the bat 11. As shown in FIG. 1, the data is sequentially input to the analyzer 15 via the signal line 16.

As shown in the block diagram of FIG. 3, the analyzing device 15 includes a control device 50 which is a CPU. The control device 50 converts the background 24 from the image information 20 captured by the image capturing device 12 with time. Bat extraction means (extraction means) 31 for removing and extracting the bat 11 at predetermined time intervals, and combining means 35 for adding time information to the extracted bat 11 at each extracted time and combining them into one screen to obtain a combined screen And the tip 1 for the bat 11 at each time on the composite screen
9, a bat tip obtaining means (measurement value obtaining means) 36 for obtaining the position of the bat 11, and the butt 11 tip 1
9, an output unit 40 that outputs the obtained speed of the tip 19 of the bat 11, a synthesized screen, a locus of the tip 19 of the bat 11, and the like, and an image captured by the imaging device 12. Is configured to monitor a part of the swing detection means 30 and to perform the same function as the swing detection means 30 for starting the processing after the bat extraction means 31 when it is determined that the swing has started.

The analysis device 15 includes an HDD 62 storing the processing procedure of the control device 50 in the form of a program,
The control device 50 includes a memory 61 for temporarily storing predetermined information, a keyboard 64 and a mouse 63 for transmitting an operator's instruction to the control device 50.

Next, the processing procedure of the analyzer 15 executed according to the program written in the HDD 62 will be described with reference to the flowchart shown in FIG.

First, in step 1 (S1), a swing detecting process is performed (swing detecting means 30). First, as shown in FIG. 2, data of a specific area 21 is acquired from image information 20 captured by the image capturing device 12. The specific area 21 is a part of the swing area on the back side of the batter 10, and is where the bat 11 passes first when the batter 10 starts to swing. Then, a difference between the latest image information 20 of the specific area 21 and the image information 20 of the immediately preceding time (predetermined time) is calculated, and the difference is compared with a predetermined reference value. Is equal to or greater than the predetermined reference value, it is determined that the swing has been started, and as shown in FIG. 4, the bat extraction process in step 2 (S2) is started. If the difference value is smaller than the predetermined reference value, it is determined that the swing has not been started yet, and the monitoring of the specific area 21 is continued.

Thus, the start of the swing of the batter 10 is detected, and the measurement of the swing speed is automatically started. If the difference value is equal to or smaller than the predetermined reference value, the start of the swing is not determined, so that erroneous detection due to noise or the like is prevented.

Next, in step 2 (S2), the bat 11 is extracted from the image information 20 (bat extracting means 31). This procedure will be described with reference to the flowchart of FIG.

First, in step 11 (S11),
As shown in FIG. 6, the image information 20a of the first time (t)
And the image information 20b of the next time (t + Δt). These image information 20a and 20b
a, 11b as well as the shadows 26 of the bats 11a, 11b
a, 26b, home bases 22a, 22b, batter 10
a, 10b, shadows 23a, 23b of the batters 10a, 10b, and grants 25a, 25b.

Next, in step 12 (S12), data of each color component of two pixels corresponding to the image at time (t) and time (t + Δt) is obtained. And
In step 13 (S13), a lightness value and a saturation value are calculated for each pixel, and if at least one of the lightness value and the saturation value is equal to or greater than a predetermined value, the two pixels are shaded. Is not determined, and step 14 (S
In 14), a difference is made for each color component of the two corresponding pixels, the sum of the absolute values of the respective difference values is taken as the difference value of the pixel, and this is binarized with a predetermined threshold value ( Difference means 32).

As a result, two corresponding pixels are represented by, for example, A in the image information 20a and B in the image information 20b, C in the image information 20a, and D in the image information 20b.
If both of the pixels of the background 24 are not shadows, since the three color component values of the two pixels are almost the same, the two pixels are differentially and binarized to have a value of “0”. It is removed from the digitized image 28a. Further, two corresponding pixels are, for example, E in image information 20a and image information 20b.
If one is a bat 11a or 11b and the other is a non-shadow background 24, as in F in FIG.
Since the color component values are different, the value is “1” due to the difference / binarization.
And each bat 11a, 11 in the two pieces of image information
b is extracted into the binarized image 28a.

On the other hand, if at step 13 both the brightness value and the saturation value of at least one pixel are less than the predetermined value, it is determined that the pixel is a shadow and step 15
In (S15), the hue values of the two corresponding pixels are calculated, and a difference based on the hue values is calculated, the absolute value is set as the difference value of the pixel, and the binarized value is binarized by a predetermined threshold value. (Shadow exclusion means 33). Thereby, the corresponding two pixels are, for example, G in image information 20a and image information 2
When both are the background 24 and at least one of them is a shadow, as in H in 0b, the hue values of these two pixels are almost the same, so that the values are converted to a difference / binarized value to “0”. This background 24 including the shadow is removed from the binarized image 28a. On the other hand, two corresponding pixels are a background 24 which is a shadow, a bat 11 which is not a shadow, and a background 2 which is not a shadow, such as I in the image information 20a and J in the image information 20b.
4 and the bat 11 which is a shadow, or the background 24 which is a shadow and the bat 11 which is a shadow, the hue values of these two pixels are different. Is extracted into the binarized image 28a.

Then, in step 16 (S16),
It waits until the difference / binarization is completed for all corresponding pixels. Thus, the image information 20a of the time (t) is obtained.
And only the bats 11a and 11b at each time are extracted from the image information 20b of the time and the time (t + Δt), and the shadows 26 of the grounds 25a and 25b and the bats 11a and 11b are extracted.
a, 26b, etc., from which the background 24 has been removed
Get. The binarized image 28a includes the bats 11a and 11
The pixel b has information “1”, and the other parts have information “0”.

Next, in step 17 (S17), the image information 2 for the next time (t + 2Δt)
0c is obtained. Then, in steps 18 (S18) to 22 (S22), the above-described steps 12 to
Similar to step 16, the difference processing is performed between the image information 20b at the time (t + Δt) and the image information 20c at the time (t + 2Δt). Thereby, the bat 11b at the time (t + Δt) and the bat 11c at the time (t + 2Δt) are extracted, and the other background image is removed.
b is obtained.

Next, in step 23 (S23), the logical product of these two binarized images 28a and 28b is calculated (logical product calculating means 34). Thus, a logical product image 29 in which only the bat 11b at the time (t + Δt) is extracted from the two binarized images 28a and 28b is obtained.

Then, in step 24 (S24), it is checked whether or not such a bat extraction process has been performed for a desired number of time-series data. If not, the process returns to step 18 and the same process is performed. to continue.

Subsequently, in step 3 (S3) shown in FIG. 4, a process of synthesizing the bat 11 in the obtained logical product image 29 into one image is performed (synthesizing means 35). First,
For the obtained AND image 29, 1
A number corresponding to 2, ... is given. Then, a composite image 41 (see FIG. 7) is obtained by the following method. That is,
For each pixel, the data of the corresponding pixel in the total logical product image 29 is examined. If only one logical product image 29 having “1” as the pixel data exists in the total logical product image 29, The time series number of the logical product image 29 is given as data of the corresponding pixel of the composite image 41, while the logical product image 29 having “1” as the data of the pixel does not exist in all the logical product images 29. Or, when there are two or more (noise described later), data “0” is given as data of a corresponding pixel of the composite image 41. Thereby, the bat 11b in each AND image 29 is synthesized on one image while adding the time information, and a synthesized image 41 as shown in FIG. 7 can be obtained.

As described above, the bat 11 is combined with the composite image 41, and the composite image 41 has information on the time when the bat 11 was photographed. Is performed, so that it is possible to obtain the front end at a higher speed than in the case where the front end obtaining process is performed on each logical product image 29 one by one. When the logical product image 29 having the information “1” is not present in the total logical product image 29 or exists in two or more, “0” is given as the information of the corresponding pixel of the composite image 41 and Bat 11
Therefore, the noise of the batter 10 and the like that cannot be completely removed by the difference means is also removed.

Next, in step 4 (S4), a bat tip obtaining process is performed to obtain the center positions of the tips 19d to 19m of the bats 11d to 11m at each time on the composite image 41 shown in FIG. Tip acquisition means 36).

First, as shown in the flowchart of FIG. 8, in step 50 (S50), the composite image 41 shown in FIG.
Is sequentially scanned from the top row in the horizontal direction with respect to the bottom of the composite image 41 line by line to search for the pixels of the bat 11, and the length of the pixels of the bat 11 continuing in the horizontal direction with respect to the bottom of the composite image 41 _Lx is obtained (see FIG. 9). And
In step 51 (S51), it determines the magnitude relationship between the maximum length L _max related to the width of the L _x and bat 11.
In the present embodiment employs 1.4 times the maximum width of the vat 11 as L _max. If L _x is L _max or more (see L _x3 in FIG. 9 (b)), the butt 11 is facing state near horizontal with respect to the base of the composite image 41 (e.g., shown in FIG. 7 The bat 11f of the composite image 41) is determined. In this case, the axis center line 44 of the bat 11 does not intersect with the line for horizontally scanning the bat 11 (FIG. 9B).
_Lx3 ), since the point 42 constituting the axis center line 44 of the bat 11 cannot be obtained by scanning in the horizontal direction with respect to the bottom of the composite image 41, the bat 11 at this time is determined in step 70 (S70). Sets that the point 42 forming the axis center line 44 is not obtained by the horizontal scan, and discards any data of the center point of the bat 11 at this time obtained by the horizontal scan until then. On the other hand, (see L _x1, L _x2 in to FIG. 9 (a)) when L _x is smaller than L _max, the state nearly vertical relative to the bottom of the butt 11 is the composite image 41 (e.g., synthesis shown in FIG. 7 It is determined that it is the bat 11d or 11e of the image 41), and the process proceeds to step 52 (S52).

In step 52, the magnitude relationship between the minimum length L _min and L _x related to the maximum width of the bat 11 is determined.
In the present embodiment, 0.7 times the maximum width of the bat 11 is adopted as L _min . If L _x is is smaller than L _min is (see L _x1 in FIG. 9) when crossing the corners of the vat 11 and, missing a part of the batt 11 by noise or the like (FIG. 10 L _x4 , L _x5 ). In this case, no point 42 constituting the axis center line 44 of the bat 11 exists on L _x , so no point is acquired. On the other hand, when the L _x is greater than or equal to L _min (FIG. 9
See L _x2 of (a)), in step 53 (S53), and acquires with time information of the batt 11 to the coordinates determined midpoint of the L _x as 42 points constituting the axial center line 44 of the bat 11 . Then, step 54 (S5
In 4), the process waits for the acquisition of the point 42 that forms the axis centerline 44 of the bats 11d to 11m at all times for all the rows on the composite image 41. In this way, the bat 11 (for example, 11d, 11e, 11g, 11g of the composite image 41 shown in FIG. 7) is almost perpendicular to the bottom of the composite image 41.
(h, 11i, 11l, 11m, etc.) are obtained.

Next, step 55 to step 59 (S
55 to S59), steps 50 to 54
According to the same procedure as that described above, the combined image 41 is sequentially scanned from the leftmost column to the bottom of the combined image 41 line by line in the vertical direction, and the bat 11 in a state substantially horizontal to the bottom of the combined image 41 is mainly scanned. , A point 42 constituting the axis center line 44 is acquired (see FIG. 9B). In this way, the bat 11 (for example, 11e, 11f, 11f of the composite image 41 shown in FIG.
g, 11i, 11j, 11k, 11l, etc.)
4 are obtained. It should be noted that the bat 1 tilted about ± 45 degrees with respect to the bottom of the composite image 41
1e, 11g, 11i, 11l, etc. are points 4 constituting the axis center line 44 in both the horizontal scan and the vertical scan.
2 is obtained.

Next, in step 60 (S60), the point 42 constituting each axis center line 44 of the bat 11 at each time obtained in this manner is linearly approximated to obtain the axis center line 44 (center). Line acquisition means 37). Then, in step 61 (S61), of the points where the axis center line 44 and the bat 11 at this time overlap, a point farthest from the batter 10 is searched, and this point is set as the tip 19 of the bat 11 at this time. Acquire (farthest point acquisition means 3
8).

Next, in step 5 (S5) shown in FIG. 4, the speed of the tip 19 is obtained (speed obtaining means 3).
9). Here, the tip 19 of the bat 11 in the adjacent time
(For example, tip 19d and tip 19e shown in FIG. 7)
Then, the moving distance on the screen during this time is acquired, this is converted into an actual distance, and the speed of the tip 19 of the bat 11 is acquired based on this moving distance and the time interval of the image acquisition of the photographing device 12.

Then, in step 6 (S6), the result is displayed (output means 40). Here, based on an instruction from the keyboard 64 or the mouse 63 of the operator, a temporal change in the speed of the tip 19 of the bat 11 as the swing speed of the bat 11 (see FIG. 12),
1. The trajectory (see FIG. 11) of the tip 19 of the bat 11 obtained by connecting the tip 19 of the bat 11 at each time in order of time, the maximum speed, and the like are output on the screen of the display device 14.

As described above, according to the swing object velocity measuring apparatus of the present embodiment, image information 20 is obtained by photographing the swing area of the bat 11 with time, and the image information 20 is obtained.
Is extracted from the bat 11 and the tip 19 on the bat 11 is extracted.
, The swing speed of the bat 11 as the speed of the tip 19 is obtained based on the temporal change of the position of the tip 19, so that remote measurement can be performed without any modification to the bat 11. It has become.

The difference between the image information 20 at a certain point in time and the image information 20 newer than this, and between the image information 20 at a certain point in time and the image information 20 older than this, for the corresponding pixels, respectively. The bin 11 is obtained by performing binarization, and the bat 11 is extracted in the logical product image 29 by performing a logical product of the binary images 28, so that the image information 20 of each time series is obtained. Bat 11 can be efficiently extracted from the bat 11.

If at least one of the two corresponding pixels is a shadow, the shadow elimination means 3 which makes a difference based on the hue value of each pixel.
3, the shadow is prevented from being extracted into the logical product image, and only the bat 11 can be extracted without erroneously recognizing the shadow as the bat 11.

The bat 11 includes a synthesizing means 35 for synthesizing the time series data of the bat 11 in the extracted logical product image 29 into one image. Is performed, the bat tip is obtained faster than the bat tip is obtained for each AND image 29 at each time, and the swing speed can be measured quickly. I have.

The composite image 41 is provided with information on the time at which the bat 11 was photographed, and the bat tip acquiring means 36 can easily recognize the photographing time of each bat 11 on the composite image 41. It is possible to more quickly measure the swing speed.

The apparatus for measuring the speed of a swing object according to the present invention is not limited to the above embodiment, but may take various modifications in accordance with other conditions. For example, in the above-described embodiment, the shadow elimination unit 33 is provided to exclude the shadow 26a of the swinging bat 11, and the like. The means 33 need not be provided.

Further, in the above embodiment, the image information 20 including the entire tip 19 of the bat 11 to be swung is acquired by the photographing device 12, but is not limited to this.
For example, the tip 1 of the bat 11 such as near the home base 22
A part of the area through which 9 passes may be acquired as image information, and the swing speed may be acquired only from that part. Also,
The photographing device 20 is installed in the vicinity of 3 to 4 meters of the batter 10, but is not limited to this. It may be installed in a place where it is located, or may be installed on the ground side such as embedded in the home base 22.

In the above embodiment, the bat 11 extracted in the logical product image 29 is synthesized into one image so that the swing speed can be measured quickly. However, instead of this, the tip 19 of the bat 11 may be obtained for each AND image 29.

In the above-described embodiment, in order to quickly measure the swing speed, the bat 11 in the logical product image 29 at each time is added with time information and then synthesized into one image. Although the shooting time of the bat 11 on the image 41 can be individually recognized, this need not be performed.

In the above embodiment, the tip 19 of the bat 11 is used as the measurement point, but the present invention is not limited to this.
Other parts such as the core of the bat 11 and the root may be measured.

In the above embodiment, the bat tip obtaining means 36 first obtains the axis center line 44 of the bat 11, and determines the point farthest from the batter 10 among the points where the axis center line 44 and the bat 11 overlap. Although acquired as the tip 19, the present invention is not limited to this. For example, a point farthest from the batter 10 among pixels constituting the bat may be acquired as the tip 19.

In the above embodiment, the trajectory and the like are output to the display device 14. However, the trajectory and the like may not be displayed, and only the swing speed may be displayed. Further, if necessary, data such as acceleration and angular velocity may be obtained and output.

In the above embodiment, the swing detecting means 30 for monitoring the specific area 21 behind the batter 10 and automatically detecting the start of the swing is employed, but the specific area 21 is not limited to this location. Alternatively, the entire image information 20 may be monitored. In addition, the swing detecting means 3
0 may not be adopted, and instead, a timing notifying unit 70 for notifying the batter 10 of the timing of the start of the swing speed measurement by, for example, sound or light may be provided. Thus, the timing of the start of the swing measurement is notified to the person, and the person can swing in accordance with the timing. Therefore, an inexpensive swing speed measuring device in which the swing detecting means 30 is omitted in a batting center or the like is provided. be able to.

In the above embodiment, the bat 11 is adopted as the object to be swung. However, the present invention is not limited to this, and a racket such as tennis, badminton, table tennis, and a golf club may be used.

[0061]

As described above, according to the apparatus for measuring the speed of a swing object according to the present invention, a swing area of the object is photographed over time to obtain image information, and the object information is extracted from the image information. By acquiring the position of a predetermined measurement point on the object, the swing speed of the object as the speed of the measurement point is obtained based on the change over time of the position of the measurement point. It is possible to provide a swing object speed measuring device capable of performing remote measurement without any problem.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a swing object speed measurement device according to an embodiment.

FIG. 2 is a schematic diagram showing image information photographed by photographing means in FIG. 1;

FIG. 3 is a block diagram of the swing object speed measuring device of FIG. 1;

FIG. 4 is a flowchart showing a processing procedure of a control device in FIG. 3;

FIG. 5 is a flowchart showing a procedure of a bat extraction process in FIG. 4;

FIG. 6 is an explanatory diagram showing a method of bat extraction processing in FIG. 4;

FIG. 7 is a diagram showing a combined image obtained by the bat combining process in FIG. 4;

FIG. 8 is a flowchart showing a procedure of a bat tip obtaining process in FIG. 4;

9A and 9B are diagrams illustrating a centerline obtaining method in the bat tip obtaining process in FIG. 4, and FIG. 9A illustrates a bat centerline obtaining method that is nearly perpendicular to the base of image information. FIG. 7B is a diagram illustrating a method of acquiring the center line of the bat that is nearly horizontal with respect to the base of the image information.

FIG. 10 is a diagram illustrating a method of acquiring a center line of an incomplete bat partly missing due to noise or the like in the bat tip acquiring process in FIG. 4;

11 is a diagram showing an image of a tip point of a bat and its trajectory displayed on the display means in FIG. 3;

FIG. 12 is a diagram showing a change over time of a swing speed displayed on a display means in FIG. 3;

[Explanation of symbols]

1. Speed measuring device for swing object, 10, 10a, 10
b: batter (person), 11, 11a to 11m: bat (object), 12: photographing device (photographing means), 19, 19d to 1
9m ... tip (measurement point), 20, 20a, 20b, 20c
... image information, 21 ... specific area (predetermined area), 28a, 2
8b ... binarized image, 29 ... logical product image, 30 ... swing detection means, 31 ... bat extraction means (extraction means), 32 ...
Difference means, 33: shadow exclusion means, 34: logical product calculation means,
35 ... combining means, 36 ... bat tip acquiring means (measuring point acquiring means), 37 ... center line acquiring means, 38 ... farthest point acquiring means, 39 ... speed acquiring means, 40 ... output means, 41 ... composed image, 44: axis center line, 70: timing notifying means.

Claims (12)

[Claims] 1. An image pickup means for photographing a swing area of an object swung by a person with time and outputting image information; an extracting means for extracting information of the object from the image information; A predetermined measurement point is set for the information of the measurement point, a measurement point acquisition means for acquiring the position, a speed acquisition means for acquiring the velocity of the measurement point based on a temporal change of the position of the measurement point, and the acquisition Output means for outputting the set speed as a swing speed of the object, a speed measurement device for the swing object. 2. The image processing apparatus according to claim 1, wherein the extracting unit is configured to perform a process between the image information at a certain point in time and the newer image information, and between the image information at a certain point in time and the older image information. A difference is obtained for each corresponding pixel to obtain a difference value, and the difference value is binarized by a predetermined threshold value to obtain a binary value.
A difference means for obtaining a binarized image, and a logical product calculating means for obtaining a logical product image by taking a logical product between the binary images,
2. The apparatus according to claim 1, wherein the object information in the AND image is information on the object extracted from the image information at the certain point in time. 3. 3. The image processing apparatus according to claim 2, wherein the extracting unit includes a shadow removing unit that recognizes a shadow in the image information and prevents the shadow from being extracted into the AND image. Speed measurement device for swing objects. 4. The difference means, between the image information at a certain time and the newer image information, and between the image information at a certain time and the older image information, If at least one of the brightness value and the saturation value of each of the two corresponding pixels is equal to or more than a predetermined value, it is determined that there is no shadow and a difference is obtained for each component of the corresponding two pixels to obtain a difference value, If the lightness value and the saturation value of at least one of the two corresponding pixels are less than a predetermined value, it is determined that there is a shadow, and the shadow elimination unit performs a difference based on the hue values of the two corresponding pixels to obtain a difference. Value
The swing object velocity measuring apparatus according to claim 3, wherein any one of the difference values is binarized by a predetermined threshold value to obtain a binarized image. 5. A synthesizing unit for synthesizing time-series data of the object information in the logical product image extracted by the extracting unit into one image to obtain a synthesized image, wherein the measurement point obtaining unit is configured to The swing object velocity measuring apparatus according to claim 2, wherein processing is performed on object information on the composite image. 6. The synthesizing unit adds the time information of the object information to the time-series data of the object information, and
The swing object velocity measuring apparatus according to claim 5, wherein the image is synthesized into two images, and a time when the object information is photographed on the composite image can be recognized. 7. The swing object speed measuring apparatus according to claim 1, wherein the measurement point acquiring unit sets a tip of the object to be swung as a measurement point. 8. The measurement point obtaining means, wherein: a center line obtaining means for obtaining an axis center line of the extracted object; and a point farthest from a position where the person exists among points where the center line and the object overlap. The apparatus for measuring the speed of a swing object according to claim 7, further comprising a farthest point acquisition unit configured to acquire a point as a measurement point at the tip of the object. 9. The method according to claim 1, wherein the output unit outputs a locus of the measurement point of the object based on a change with time of the position of the measurement point acquired by the measurement point acquisition unit. The speed measuring device for a swing object according to any one of claims 1 to 8. 10. A swing detection, wherein a predetermined area of image information photographed by the photographing means is monitored, the extracting means is activated when a change of a predetermined amount or more occurs, and the extracting means is stopped after a predetermined time. The apparatus for measuring the speed of a swing object according to any one of claims 1 to 9, further comprising means. 11. A timing notifying means for generating at least one of sound and light and notifying the person of the start timing of the extracting means to a person at a predetermined time before the extracting means is activated. A speed measurement apparatus for a swing object according to any one of claims 1 to 9. 12. The apparatus according to claim 1, wherein the object is a bat.