WO2017008218A1

WO2017008218A1 - Hawk-eye identification method and system in tennis match

Info

Publication number: WO2017008218A1
Application number: PCT/CN2015/083819
Authority: WO
Inventors: 张阳
Original assignee: 张阳
Priority date: 2015-07-10
Filing date: 2015-07-10
Publication date: 2017-01-19

Abstract

A Hawk-Eye identification method and system in a tennis match. The method comprises: 101, periodically capturing images via a camera arranged at a corner of a court, where the angles between the camera and each side are all 45°; 102, positioning images of a tennis ball in the images, projecting the tennis ball onto the X axis, the Y axis, and the Z axis; 103, calculating the distance between the projection of the tennis ball on the X axis, the Y axis, and the Z axis and a calibration line; 104, acquiring the coordinates of the tennis ball on the three axes on the basis of the distance; and 105, repeating the above steps until the coordinates of the tennis ball in all of the images are acquired, and drawing the trajectory of the tennis ball on the basis of the coordinates of the tennis ball. The present identification method has the advantage of being inexpensive compared with a currently applied method in which multiple cameras are used to determine the trajectory of a tennis ball to determine whether or not same went out-of-bounds or clipped the line.

Description

Title: Invention Name: Hawkeye Recognition Method and System in Tennis Competition

[0001] The present invention belongs to the field of sporting goods, and in particular relates to a method and system for eagle eye recognition in a tennis game.

Background technique

[0002] Tennis is a very popular sport in the world. The majority of the ball out of the existing tennis game is judged by the referee. This method is very prone to misjudgment. In order to solve this problem, the prior art provides a The eagle eye judging system, which can synthesize the trajectory of the tennis ball through the picture captured by a plurality of high speed cameras, although this method is very accurate, but because the number of cameras of the system is large, the cost is very high, so the existing The cost of the eagle eye recognition system is very high.

technical problem

[0003] An object of embodiments of the present invention is to provide a method for identifying an eagle eye in a tennis game, which aims to solve the problem of high cost of the prior art solution.

Problem solution

Technical solution

[0004] In one aspect, a method for eagle eye recognition in a tennis game is provided, the method comprising:

[0005] 101, a picture taken periodically by a camera disposed at a corner of the field; the angle between the camera and each side is 45 °;

[0006] 102, positioning a picture of the tennis ball in the picture, projecting the tennis ball onto the X axis, the Y axis, and the Z axis;

[0007] 103. Calculate a distance between a projection calculated on the X axis, the Y axis, and the Z axis and a calibration line;

[0008] 104, obtain the three-axis coordinates of the tennis ball through the distance;

[0009] 105. Repeat the above steps until the tennis coordinates of all pictures are acquired, and the tennis track is drawn according to the tennis coordinates.

[0010] The method provided by the present invention realizes the drawing of a tennis trajectory by a single high-speed camera, so that it has the advantage of low cost.

[0011] Optionally, the implementation of the 102 is specifically:

[0012] Multiplying the picture of the tennis ball by 0.707 gives a picture of the tennis ball projected onto the X-axis, the Y-axis, and the Z-axis. [0013] In another aspect, a eagle eye recognition system for a tennis game is provided, the system comprising:

[0014] a photographing unit, configured to periodically take a picture by a camera disposed at a corner of the field; the angle between the camera and each side is 45°;

[0015] a projection unit, configured to position a picture of the tennis ball in the picture, project the tennis ball onto the X axis, the Y axis, and the Z axis; [0016] a calculation unit, configured to calculate the projection onto the X axis, the Y axis, and the Z axis Projection calculates the distance from the calibration line; [0017] a coordinate unit for acquiring the three-axis coordinates of the tennis ball through the distance;

[0018] a drawing unit, configured to repeat the above steps until the tennis coordinates of all the pictures are acquired, and the tennis track is drawn according to the tennis coordinates.

[0019] Optionally, the projection unit is specifically configured to multiply a picture of the tennis ball by 0.707 to obtain a tennis picture projected by the tennis ball onto the X-axis, the Y-axis, and the Z-axis.

Advantageous effects of the invention

Beneficial effect

[0020] In the embodiment of the present invention, the technical solution provided by the present invention provides a new eagle eye recognition method, which can realize most functions of the current eagle eye by setting a few high-speed cameras, which effectively reduces the cost.

Brief description of the drawing

DRAWINGS

1 is a flow chart of a method for identifying an eagle eye in a tennis match according to the present invention;

2 is a structural diagram of a eagle eye recognition system in a tennis match according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] A specific embodiment of the present invention provides a method for identifying an eagle eye in a tennis game. The method is as shown in FIG. 1 and includes:

[0025] 101, periodically taking a picture by a camera disposed at a corner of the field; the camera and each side of the clip The angle is 45°;

[0026] 102, positioning a picture of the tennis ball in the picture, projecting the tennis ball onto the X axis, the Y axis, and the Z axis;

[0027] 103. Calculate a distance between a projection calculated on the X axis, the Y axis, and the Z axis and a calibration line;

[0028] 104, obtaining the three-axis coordinates of the tennis ball by the distance;

[0029] 105. Repeat the above steps until the tennis coordinates of all the pictures are acquired, and the tennis track is drawn according to the tennis coordinates.

[0030] The method provided by the present invention acquires the coordinates of the tennis ball by taking a picture, and can acquire the coordinates of the tennis ball only by a single camera, so it has the advantage of low cost.

[0031] Optionally, the implementation method of the foregoing 102 may specifically be:

[0032] Multiplying the picture of the tennis ball by 0.707 gives a picture of the tennis ball projected onto the X-axis, the Y-axis, and the Z-axis.

[0033] A specific embodiment of the present invention also provides a eagle eye recognition system in a tennis game, as shown in FIG. 2, the system includes:

[0034] The photographing unit 201 is configured to periodically take a picture by a camera disposed at a corner of the field; the angle between the camera and each side is 45°;

[0035] The projection unit 202 is configured to locate a picture of the tennis ball in the picture, and project the tennis ball onto the X axis, the Y axis, and the Z axis.

[0036] The calculating unit 203 is configured to calculate a distance between a projection calculation projected onto the X axis, the Y axis, and the Z axis and the calibration line

[0037] a coordinate unit 204, configured to acquire three-axis coordinates of the tennis ball by the distance;

[0038] The drawing unit 205 is configured to repeat the above steps until the tennis coordinates of all the pictures are acquired, and the tennis track is drawn according to the coordinates of the net.

[0039] Optionally, the projection unit 202 is specifically configured to multiply a picture of the tennis ball by 0.707 to obtain a tennis projection.

Tennis picture on the X, Y, and Z axes.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalents, and improvements made within the spirit and scope of the present invention should be included in the present invention. Within the scope of protection of the invention.

Claims

Claim

[Claim 1] A method for eagle eye recognition in a tennis game, characterized in that the method comprises:

101. Periodically taking a picture by a camera disposed at a corner of the field; the angle between the camera and each side is 45°;

102. Position the picture of the tennis ball in the picture, and project the tennis ball onto the X axis, the Y axis, and the Z axis;

103. Calculate the distance between the projection calculation projected onto the X-axis, the Y-axis, and the Z-axis and the calibration line;

104. Obtain three-axis coordinates of the tennis ball through the distance;

105. Repeat the above steps until the tennis coordinates of all the pictures are obtained, and draw the tennis track according to the tennis coordinates.

[Claim 2] The method according to claim 1, wherein the implementation of the 102 is specifically: multiplying a picture of the tennis ball by 0.707 to obtain a tennis picture of the tennis ball projected onto the X-axis, the Y-axis, and the Z-axis. .

[Claim 3] A eagle eye recognition system in a tennis game, characterized in that the system comprises:

a photographing unit, configured to periodically take a picture by a camera disposed at a corner of the field; the angle between the camera and each side is 45°;

a projection unit for positioning a picture of the tennis ball in the picture, projecting the tennis ball onto the X axis, the Y axis, and the Z axis;

a calculation unit for calculating a distance between a projection calculation projected onto the X-axis, the Y-axis, and the Z-axis and the calibration line;

a coordinate unit for acquiring the three-axis coordinates of the tennis ball by the distance; a drawing unit for repeating the above steps until the tennis coordinates of all the pictures are acquired, and the tennis track is drawn according to the tennis coordinates.

[Claim 4] The system of claim 3, wherein

The projection unit is specifically configured to multiply the picture of the tennis ball by 0.707 to obtain a tennis picture projected by the tennis ball onto the X-axis, the Y-axis, and the Z-axis.