CN202920940U - Device for detecting ping-pong throwing height - Google Patents
Device for detecting ping-pong throwing height Download PDFInfo
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- CN202920940U CN202920940U CN 201220588434 CN201220588434U CN202920940U CN 202920940 U CN202920940 U CN 202920940U CN 201220588434 CN201220588434 CN 201220588434 CN 201220588434 U CN201220588434 U CN 201220588434U CN 202920940 U CN202920940 U CN 202920940U
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- pong
- ping
- table tennis
- height
- toss
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Abstract
The utility model discloses a device for detecting ping-pong throwing height. The device comprises a high-speed camera, an image acquisition card and an upper computer, wherein the high-speed camera is connected with the image acquisition card through a video signal cable; and the output end of the image acquisition card is connected with the upper computer. The device further comprises a display, wherein the display is connected with the upper computer and used for displaying the detection result. On one hand, the device for detecting the ping-pong throwing height provides a good platform for ping-pong training, scientifically reflects the ping-pong serving level of an athlete, serves as reference data for improving the ping-pong serving technology and greatly improves the training efficiency of the athletes; and on the other hand, the device for detecting the ping-pong throwing height can provide objective ping-pong throwing data in a competition, simplifies the ping-pong judgment process, reduces the ping-pong judgment dispute and greatly reduces subjective misjudgment factors.
Description
Technical field
The utility model belongs to the sports goods technical field, relates to a kind of height detecting device, relates in particular to a kind of checkout gear of table tennis toss height.
Background technology
Table tennis is a kind of pandemic ball game project, and wherein service is the core technology in the table tennis match.International Table Tennis Federation is for service clear " server must almost vertically upwards throw ball with hand, must not make ball rotation, and makes ball increase after leaving the palm of free hand to be no less than 16 centimetres, and ball drops to can not encounter any object before being hit ".
In present match, can cause between judge and sportsman that what dispute on is exactly this rule, whether 16 centimetres of wherein comprising are too specific, there is no at present relevant apparatus and can objectively measure the service height, in violation of rules and regulations can only be with judging after judge's subjective visual inspection.Whether at home and abroad in the match, judge by accident and repeatedly cause dispute, therefore sportsman's state is greatly affected, severe patient more, and even the impact match normally carries out.At present about table tennis toss measuring method highly, there is no the related invention patent relates to, relevant processing thinking is also extremely rare, China Patent Publication No. is that the patent of invention of CN1453740A has been set forth the method for being measured object in scene and scene by single image, but its processing is still image, for dynamic video and inapplicable.China Patent Publication No. provides a kind of moving image quality of picture to measure evaluating apparatus for the patent of invention of CN1788498, and the moving image quality of picture can be measured, but the detection of distance can not be realized, and the more difficult realization of optical component structure complexity.
In sum, the method that detects at present table tennis toss height is almost blank, and the measurement of correlation thinking also has all limitations, is badly in need of relevant measurement mechanism in practical application and sentences ball.
In view of this, nowadays in the urgent need to designing a kind of checkout gear of table tennis toss height, in order to the toss height of table tennis detected.
The utility model content
Technical problem to be solved in the utility model is: the checkout gear of a kind of table tennis toss height is provided, can demonstrates athletic toss height in the ping-pong contest process, sentence the ball process thereby simplify, also make and sentence chou and really have more convincingness.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of checkout gear of table tennis toss height, described device comprises: high-speed camera, image pick-up card and host computer; Described high-speed camera is connected with image pick-up card by video signal cable, and the output of image pick-up card is connected with host computer.
As a kind of preferred version of the present utility model, described device also comprises display, and this display is connected with host computer, in order to show testing result.
As a kind of preferred version of the present utility model, described high-speed camera is erected at sportsman's one side of the overall process that can photograph service.
Further, be loaded with primary control program in described host computer, after operation calculates table tennis toss height through program, on the display screen of host computer, toss highly shown.Described host computer is with the OPENCV development environment, with display screen; Described camera can be clapped the high definition picture, and wherein every two field picture is without smear.The primary control program of host computer comprises that the moved apart part (comprises the background modeling part, difference image is got the prospect part), draw together the Hough transformation part, table tennis radius measurement part in video recording rises and throws some feature identification division, peak Extraction parts, toss high computational part in video recording, actual toss high computational part, error compensation part, and toss height display part as a result.
Further, the thought of moved apart part is: first set up background model, present frame and background model are compared, change larger zone and be prospect.The calculating of back is only for the prospect part, thereby the amount of calculation that greatly reduces has improved arithmetic speed.
Further, Hough transformation partly identifies the standard round in video recording, and after identification, calculates the table tennis diameter size in video recording, and store, in order to later stage calculating.
Further, a basis for estimation of rise throwing point is that in video, table tennis is rendered as standard round, and the basis for estimation of peak is the maximum in the Y coordinate of pixel.
Further, according to rise throwing a point, peak, and the ratio of table tennis diameter size and actual standard table tennis diameter 40mm in picture recording calculate table tennis toss height.
Further, for improving certainty of measurement, the compensation ball is highly shown the toss after error compensation casting moment aside by the error of palm covering part.
The beneficial effects of the utility model are: the checkout gear of the table tennis toss height that the utility model proposes, provide good platform for table tennis training on the one hand, scientifically reacted sportsman's service level, and with its reference as the improvement service technique, greatly improve training athlete efficient.On the other hand, can provide in play objective toss data, simplify and sentence the ball process, reduce and sentence the ball dispute, greatly reduce subjective erroneous judgement factor.
The structure of the utility model checkout gear is very simple, and wherein the high-speed camera head both can be provided for oneself, also can utilize the existing media camera lens of in-situ match, thereby reaches the purpose of saving cost.By the extraction to prospect, greatly reduce amount of calculation in algorithm, simplified calculating process, thereby improved arithmetic speed, but in-situ match instant playback toss height.
The utility model by moved apart, Hough transformation, calculating barycenter are combined to reset the methods such as search window value, has overcome the easy situation with losing of target in complex environment object in the conventional video processing in primary control program, strengthened the robustness of system.Compared to original judge's subjective visual inspection judgement, its toss height value is rendered as data mode, provide objective basis for sentencing the ball process, and precision improves greatly.
Description of drawings
Fig. 1 is the structural representation of the utility model checkout gear.
Fig. 2 is that the high-speed camera headstock of the utility model checkout gear is established the orientation schematic diagram.
Fig. 3 is the toss height algorithm flow chart of the utility model checkout gear.
Fig. 4 is the general flow chart of the table tennis toss height detection method of the utility model checkout gear.
The accompanying drawing mark is as follows:
1: high-speed camera 2: image pick-up card
3: host computer 4: the high-speed camera position that in-situ match is laid
5: paddler position 6: the table tennis table position
The specific embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.
Embodiment one
See also Fig. 1, the utility model discloses a kind of checkout gear of table tennis toss height, comprises high-speed camera 1, image pick-up card 2, host computer 3.High-speed camera 1 is connected with image pick-up card 2 by video signal cable, and the output of image pick-up card 2 is connected with host computer 3.In addition, described device can also comprise the display that is connected with host computer 3, in order to show testing result.
High-speed camera 1 can satisfy takes the high definition picture, and every frame gets final product without smear.Image pick-up card 2 adopts the image pick-up card that mates with high-speed camera to get final product.Host computer 3 adopts the computer of any PC framework of existing market main flow all can meet design requirement, and system adopts WINDOWS XP operating system, and the software programming platform adopts OPEN CV.
High-speed camera erecting orientation need be erected at sportsman's one side as shown in Figure 2, can photograph the overall process of service.
Computer after working procedure, highly is presented at toss on computer display in OPEN CV.The video data that photographs, in the primary control program that is sent in computer, data handling procedure mainly comprises following step:
S1: start, system initialization has judged whether that video imports.
S2: have image to import and separate prospect and background, otherwise got back to for the 1st step.
S3: process isolated foreground image, identify table tennis with Hough transformation, record and storage pixel coordinate figure, table tennis diameter.
S4: from motion tracking table tennis track, until peak judges whether the Y coordinate figure continues to reduce, be to carry out next step, otherwise repeating step S4.
S5: calculate the toss height.
S6: after toss height result shows, EP (end of program).
When carrying out moving object separating part algorithm, first with the background modeling of video, then with original video image subtracting background image, namely get foreground image.Only foreground portion is divided in following calculating and process, reduce amount of calculation, improve arithmetic speed.
In order to realize tracking effect good in dynamic video, the algorithm of employing is as follows: first initialize size and the location of search window in the first frame, then calculate its color histogram, can get probability distribution graph according to histogram, thus, can calculate the barycenter of search window.With the barycenter data of the present frame primary data as next frame, thereby realize the effect of object tracking.
Calculate the process of toss height as shown in Figure 3, after utilizing Hough transformation standard round to be detected in video, calculate the diameter of a circle size on the one hand, and be divided by with 40mm, obtain the ratio with actual table tennis size; On the other hand, continue to follow the tracks of the motion process of table tennis, until obtain the Y coordinate of peak, and calculate toss height in video by formula.By two aspect data, try to achieve in proportion the toss height of actual table tennis, and this is highly carried out error compensation at last.
The flow chart of whole detection method after collecting video, carries out moved apart, table tennis is followed the tracks of and recorded and thrown point and peak, toss high computational and show etc. that the step is poly-, completes the detection of table tennis toss height as shown in Figure 4.
In sum, the checkout gear of the table tennis toss height that the utility model proposes provides good platform for table tennis training on the one hand, has scientifically reacted sportsman's service level, and with its reference as the improvement service technique, greatly improve training athlete efficient.On the other hand, can provide in play objective toss data, simplify and sentence the ball process, reduce and sentence the ball dispute, greatly reduce subjective erroneous judgement factor.
Here description of the present utility model and application is illustrative, is not to want with scope restriction of the present utility model in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that in the situation that do not break away from spirit of the present utility model or substantive characteristics, and the utility model can be with other form, structure, layout, ratio, and realizes with other assembly, material and parts.In the situation that do not break away from the utility model scope and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (2)
1. the checkout gear of a table tennis toss height, is characterized in that, described device comprises high-speed camera, image pick-up card and host computer;
Described high-speed camera is connected with image pick-up card by video signal cable, and the output of image pick-up card is connected with host computer.
2. the checkout gear of table tennis toss according to claim 1 height is characterized in that:
Described device also comprises display, and this display is connected with host computer, in order to show the testing result of host computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220588434 CN202920940U (en) | 2012-11-09 | 2012-11-09 | Device for detecting ping-pong throwing height |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220588434 CN202920940U (en) | 2012-11-09 | 2012-11-09 | Device for detecting ping-pong throwing height |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202920940U true CN202920940U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220588434 Expired - Fee Related CN202920940U (en) | 2012-11-09 | 2012-11-09 | Device for detecting ping-pong throwing height |
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| Country | Link |
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| CN (1) | CN202920940U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106853289A (en) * | 2015-12-09 | 2017-06-16 | 上海体育学院 | Table tennis ball serving judge accessory system and its detection method based on video identification |
-
2012
- 2012-11-09 CN CN 201220588434 patent/CN202920940U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106853289A (en) * | 2015-12-09 | 2017-06-16 | 上海体育学院 | Table tennis ball serving judge accessory system and its detection method based on video identification |
| CN106853289B (en) * | 2015-12-09 | 2019-06-07 | 上海体育学院 | Table tennis ball serving based on video identification judges auxiliary system detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20131109 |