CN101829424A - Portable pingpong rotation detecting device - Google Patents
Portable pingpong rotation detecting device Download PDFInfo
- Publication number
- CN101829424A CN101829424A CN200910152253A CN200910152253A CN101829424A CN 101829424 A CN101829424 A CN 101829424A CN 200910152253 A CN200910152253 A CN 200910152253A CN 200910152253 A CN200910152253 A CN 200910152253A CN 101829424 A CN101829424 A CN 101829424A
- Authority
- CN
- China
- Prior art keywords
- rotation
- table tennis
- user
- glasses
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Studio Devices (AREA)
Abstract
The invention relates to a portable pingpong rotation detecting device which belongs to the technical field of electronic information. The portable ping-pong rotation detecting device can help a user to correctly judge the rotation characteristic of a coming ball. A sequence image of a pingpong is obtained through a video camera, the image is processed, the characteristic of the pingpong is extracted, the rotating direction and the strength of the pingpong are computed, and a user is informed in a certain mode. The whole device can be quite small and light, can be inlaid into a pair of eyeglasses and is convenient to carry and use. In a product design, an integrated module comprising a miniature video camera, a microprocessor chip for processing and computation, a button cell for supplying power, a switch and the like is inlaid in the center of an ordinary pair of eyeglasses. The output control of the module is positioned in a linear luminous point range in the inner frame of the pair of eyeglasses. Taking an LED (Light Emitting Diode) with eight light dots as an example, the directions of 0 o'clock, the 3 o'clock, the 6 o'clock and the 9 o'clock thereof respectively correspond to upward rotation, rightward rotation, downward rotation and leftward rotation. The midpoints of the four time periods respectively correspond to right-upward rotation, right-downward rotation, left-downward rotation and left-upward rotation. The brightness thereof represents the rotating strength. Normal eyes can sense the luminous points around the inner frame of the ordinary pair of eyeglasses.
Description
The technical field electronic information
The volume of table tennis is little fast with speed in the background technology ping-pong contest, makes general spectators be difficult to see clearly.The bout of ping-pong contest makes spectators think that it is excellent inadequately very little.Bout main cause very little is that the serving side can utilize various means, sends the screw that makes the receiving side be difficult to judge.The result is that the receiving side is direct " eat ball " or the return of serve quality low, and by serving side's kill.The strange rotation that also has " the strange bat " to cause.International Table Tennis Federation has taked a series of measures, reforms the relevant device (billiard table, net, racket, ball, glue etc.) of table tennis, sportsman's delivery of service is made the regulation of many harshnesses.But effect is unsatisfactory----, and the table tennis motion is promoted slowly in many countries, and the television relay of its match income is lower, influences less.
The revolving property that the portable pingpong rotation detecting device that we invent can help the user correctly to judge.Obtain the sequence image of table tennis by video camera, handle image, extract the table tennis feature, calculate table tennis direction of rotation and intensity, and inform the user in some way.Whole device can be very little very light, can be mounted on the glasses, and is easy to carry and use.A kind of product design is, inlays by minisize pick-up head in the common spectacles middle and handles the microprocessor chip of calculating and provide the button cell of power supply and the integrated piece of touching that switch etc. constitutes.This output control of touching piece is positioned at the linear luminous point range in the glasses inside casing.With 8 LED is example, and at its 0 o'clock, at 3 o'clock, at 6 o'clock, 9 o'clock revolved on the correspondence respectively, and revolve on the right side, backspin, left side spin.The mid points of above-mentioned four time periods is corresponding respectively right side topspin, right side underspin, left side underspin, left side topspin.Spin intensity is represented in its brightness.Normal eye can the interior picture frame of perception common spectacles luminous point on every side.
The meaning of this patent is, it is direct to reduce the receiving side " eat ball " or the return of serve quality low, and by the phenomenon of serving side's kill.Alleviate simultaneously " the strange bat " effect of (long glue, rubber, overaging/oxidation etc.).Increase the bout of ping-pong contest, improve the ping-pong contest sight.Make more spectators and participant realize the excellent and artistic of table tennis.Promote table tennis to popularize and development global.
The summary of the invention portable pingpong rotation detecting device is based on having the integrated of mature technology and product now.Minisize pick-up head, the computer microprocessor chip, button cell, the size of LED luminous point is in the millimeter level, weight is in the gram level, the obtaining of image, handle and the demonstration of signal all at Millisecond.Whole device can be integrated on the common spectacles.Certainly the product form of portable pingpong rotation detecting device may be not limited to glasses.
The glasses of one or more minisize pick-up heads are housed, product has been arranged.And the resolution ratio of the minisize pick-up head on the present mobile phone has reached 5 ~ 10 mega pixels.The electronic shutter of sensors such as CCD (being the reading speed of photographic plate pel array) can reach 1000 frame per seconds or higher.In fact, 300 frames have product already to the minisize pick-up head of 1000 frame per seconds.Owing to only need handle calculating, so do not need to store a large amount of video datas to adjacent two frames (or a few frame) image.To the extraction of table tennis shape facility, can utilize its color different with background; Extract round-shaped HOUGH conversion; Can be as the table tennis trade mark and the spot of feature.According to the displacement of table tennis feature on adjacent two two field pictures, can calculate the direction and the speed of table tennis rotation.According to the area that table tennis occupies on image, can estimate the distance of table tennis and camera, can calculate the speed that table tennis leaps table top, to go back the decidable table tennis be ball or remove ball.Optical flow approach in the computer vision is exactly a kind of feasible method.Bibliographical information is crossed various detection tablees tennis, tennis, and the method for revolving properties such as football all realizes on the large-scale equipment that can't carry.This device through improving, also can be applicable to other field outside the table tennis.
Because table tennis is in the center of sportsman's vision, so the camera of suitable focal length can make table tennis be in every two field picture, table tennis occupies certain pixel count again simultaneously.For the camera of 1 meter square visual field and 5 mega pixels, 40 millimeters table tennis occupies the 40*40*5=8000 pixel.The definition of table tennis direction of rotation is based on paddler's sensation, rather than with table tennis from as reference system.In fact, because active force and reaction force between ball and the racket, the direction of two kinds of definition is just opposite.
Result of study according to the scientific research committee of Chinese table tennis association, the forehand smash of 40 millimeters big balls (linear speed) is that 15.4 meter per seconds (2.49 gram) are to 17 meter per seconds (2.79 gram) the soonest, loop drive rotating speed the highest 105 revolutions per seconds (2.49 gram) is to 116.5 revolutions per seconds (2.79 grams), and 75 revolutions per seconds of the maximum speeds (Guoliang LIU) of service.According to sample of signal theorem (Nyquist), detect 150 revolutions per seconds and following, the camera of 300 frame per seconds gets final product.General household video camera is 24 or 30 frame per seconds, as low-end product, can be used for detecting table tennis fan's service revolving property.In fact, 300 frames not only do not have technical problem to the camera of 1000 frame per seconds, and product is arranged already.From camera (adjacent two frames) image sampling, chip is handled, and shows that to glasses scope circle LED total time is less than 10 milliseconds (persistence of vision of human eye is 100 ~ 500 milliseconds).Table tennis along the distance of table top (to direction one's own side) operation less than 0.01 second=0.2 meter of 20 meter per second *.Less than 1/10th of billiard table total length (2.74 meters).And need most what judge rotation is not that (this is because smash waits the quick that causes, and makes the receive reason of failure of receiving side, is speed rather than rotation to quick.In fact, aerodynamics has determined most of quicks to revolve on all being, otherwise can out-of-bounds.), but slow ball one its speed has only the part of quick.So in the process of whole detection and the rotation of demonstration table tennis, table tennis has only 1/tens of billiard table total length along the distance of billiard table operation.In a word, portable pingpong rotation detecting device can be informed the revolving property of user's ball in real time in moment.
Spin intensity is slightly different to athletic influence with direction of rotation.Causing the receiving side directly to eat ball or the low-quality main cause of returning serve, is the error in judgement to direction of rotation.Caused using wrong action, on rubbing with the hands, revolved (out-of-bounds), pushed and revolve (planting net).And the judgement of spin intensity, according to the other side's action, ball speed etc., easier than judging direction of rotation.In addition, the psychology when judging direction of rotation hesitates, and also is to cause the receiving side directly to eat ball or the low-quality major reason of returning serve.On the other hand, the judgement of left and right sides sidespin is than last backspin easy (comprising clockwise and reverse).Mix with last backspin in the service (as under the side, on the side) at sidespin, mainly work (receiving side eats ball or the return of serve quality is low) be still the backspin composition.Service in the real racetrack nearly all is a sidespin and the mixing of last backspin.Generally speaking, go up backspin, just can greatly reduce and directly eat ball or return serve low-quality generation as long as the receiving side knows.
Perhaps following table tennis may comprise superficial makings, with the rotation that makes things convenient for the receiving side to judge.Simultaneously, the table tennis that has texture is more eye-catching than the table tennis of solid color, the easier less table tennis of volume of seeing clearly of spectators own.Certainly the table tennis that has a texture also helps machine and extracts feature outside the table tennis trade mark.
Can not having eyeglass on the portable pingpong rotation detecting device glasses, can be plano lens, can the person of being to use be the eyeglass of correcting defects of vision and having worn also.The small size and the light weight of whole device (minisize pick-up head, computer microprocessor chip, button cell, LED luminous point) can combine it fully with glasses together, and do not influence the use of glasses.Parts except that minisize pick-up head and LED luminous point also can be placed on other places, as hang between waist.Between itself and camera and the spectacle-frame LED in some way (wired or wireless) interrelate.
The quantity of LED luminous point is corresponding to the accuracy of table tennis direction of rotation.Technology more than eight LED luminous points (as 16 points, 32 points, even linear LED sequence etc.) realizes without a doubt, but the direction of rotation accuracy of 8 LED representatives (on revolve, revolve on the right side, backspin, left side spin, right side topspin, right side underspin, left side underspin, left side topspin), enough.
During the games, table tennis is the center of watching attentively of eyes.Thereby table tennis is also in the visual field of camera.If do not have table tennis in the visual field of camera or a plurality of tablees tennis arranged, then do not show revolving property.Because the change of table tennis direction of rotation occurs in ball basically when contacting with racket (net once in a while also may change the table tennis direction of rotation), then do not change the table tennis direction of rotation with contacting of the playing surface of the table, so in general, glasses inside casing luminous point position can not change in ball process inside, is going to ball process inside can not change yet.Instantaneous rotation was indicated after the user can bat according to the other side, and long time (ball leaves the other side's racket, leaps net, falls into one's own side's table top and take-off) is arranged.In fact, even after net, or after falling into one's own side's table top and upspringing, the sportsman understands that revolving property is not late yet.If do not need the rotation indication of ball, can close it, so that concentrate one's energy to judge the rotation of the other side's ball.
The appended illustration of description of drawings is the example explanation of a product of portable pingpong rotation detecting device.The center of glasses is minisize pick-up heads, computer microprocessor chip, miniature button cell.The LED luminous point be positioned at spectacle-frame around.Fig. 1 to Fig. 8 is corresponding respectively when detecting different table tennis rotations, the luminous situation of LED luminous point.The user is by the rotation of LED luminous point perception table tennis.Under the normal condition, people on every side cannot see these LED luminous points.
Specific embodiment portable pingpong rotation detecting device is based on having the integrated of mature technology and product now.Minisize pick-up head, the computer microprocessor chip, button cell, the size of LED luminous point is in the millimeter level, weight is in the gram level, the obtaining of image, handle and the demonstration of signal all at Millisecond.Whole device can be integrated on the common spectacles.Certainly the product form of portable pingpong rotation detecting device may be not limited to glasses.
The glasses of one or more minisize pick-up heads are housed, product has been arranged.And the resolution ratio of the minisize pick-up head on the present mobile phone has reached 5 ~ 10 mega pixels.The electronic shutter of sensors such as CCD (being the reading speed of photographic plate pel array) can reach 1000 frame per seconds or higher.In fact, 300 frames have product already to the minisize pick-up head of 1000 frame per seconds.Owing to only need handle calculating, so do not need to store a large amount of video datas to adjacent two frames (or a few frame) image.To the extraction of table tennis shape facility, can utilize its color different with background; Extract round-shaped HOUGH conversion; Can be as the table tennis trade mark and the spot of feature.According to the displacement of table tennis feature on adjacent two two field pictures, can calculate the direction and the speed of table tennis rotation.According to the area that table tennis occupies on image, can estimate the distance of table tennis and camera, can calculate the speed that table tennis leaps table top, to go back the decidable table tennis be ball or remove ball.Optical flow approach in the computer vision is exactly a kind of feasible method.Bibliographical information is crossed various detection tablees tennis, tennis, and the method for revolving properties such as football all realizes on the large-scale equipment that can't carry.This device through improving, also can be applicable to other field outside the table tennis.
Because table tennis is in the center of sportsman's vision, so the camera of suitable focal length can make table tennis be in every two field picture, table tennis occupies certain pixel count again simultaneously.For the camera of 1 meter square visual field and 5 mega pixels, 40 millimeters table tennis occupies the 40*40*5=8000 pixel.The definition of table tennis direction of rotation is based on paddler's sensation, rather than with table tennis from as reference system.In fact, because active force and reaction force between ball and the racket, the direction of two kinds of definition is just opposite.
Result of study according to the scientific research committee of Chinese table tennis association, the forehand smash of 40 millimeters big balls (linear speed) is that 15.4 meter per seconds (2.49 gram) are to 17 meter per seconds (2.79 gram) the soonest, loop drive rotating speed the highest 105 revolutions per seconds (2.49 gram) is to 116.5 revolutions per seconds (2.79 grams), and 75 revolutions per seconds of the maximum speeds (Guoliang LIU) of service.According to sample of signal theorem (Nyquist), detect 150 revolutions per seconds and following, the camera of 300 frame per seconds gets final product.General household video camera is 24 or 30 frame per seconds, as low-end product, can be used for detecting table tennis fan's service revolving property.In fact, 300 frames not only do not have technical problem to the camera of 1000 frame per seconds, and product is arranged already.From camera (adjacent two frames) image sampling, chip is handled, and shows that to glasses scope circle LED total time is less than 10 milliseconds (persistence of vision of human eye is 100 ~ 500 milliseconds).Table tennis along the distance of table top (to direction one's own side) operation less than 0.01 second=0.2 meter of 20 meter per second *.Less than 1/10th of billiard table total length (2.74 meters).And need most what judge rotation is not that (this is because smash waits the quick that causes, and makes the receive reason of failure of receiving side, is speed rather than rotation to quick.In fact, aerodynamics has determined most of quicks to revolve on all being, otherwise can out-of-bounds.), but slow ball--its speed has only the part of quick.So in the process of whole detection and the rotation of demonstration table tennis, table tennis has only 1/tens of billiard table total length along the distance of billiard table operation.In a word, portable pingpong rotation detecting device can be informed the revolving property of user's ball in real time in moment.
Can not having eyeglass on the portable pingpong rotation detecting device glasses, can be plano lens, can the person of being to use be the eyeglass of correcting defects of vision and having worn also.The small size and the light weight of whole device (minisize pick-up head, computer microprocessor chip, button cell, LED luminous point) can combine it fully with glasses together, and do not influence the use of glasses.Parts except that minisize pick-up head and LED luminous point also can be placed on other places, as hang between waist.Between itself and camera and the spectacle-frame LED in some way (wired or wireless) interrelate.
The quantity of LED luminous point is corresponding to the accuracy of table tennis direction of rotation.Technology more than eight LED luminous points (as 16 points, 32 points, even linear LED sequence etc.) realizes without a doubt, but the direction of rotation accuracy of 8 LED representatives (on revolve, revolve on the right side, backspin, left side spin, right side topspin, right side underspin, left side underspin, left side topspin), enough.
Claims (11)
1. mancarried device that detects the table tennis revolving property.By obtaining the sequence image of table tennis, handle image, extract the table tennis feature, calculate table tennis direction of rotation and intensity.And inform the user in some way.
2. the device in the claim 1, comprise and inlayed the following integrated common spectacles of touching piece and linear luminous point range: the integrated piece of touching comprises minisize pick-up head, handles the microprocessor chip of calculating, miniature button cell and switch etc.This output control of touching piece is positioned at the linear luminous point range (as LED) in the glasses inside casing.
3. the device in the claim 1 comprises the common spectacles of having inlayed some following parts: minisize pick-up head, handle the microprocessor chip of calculating, miniature button cell, switch, luminous point range etc.Other parts may be positioned at other places, such as, hang over user's waist, back etc.
4. the device in the claim 1 may not be glasses.
5. the device in the claim 1 may comprise one or more video cameras.
6. the device in the claim 1 is informed the information of user about the table tennis rotation by LED.
7. the device in the claim 1 uses the alternate manner outside the LED to inform the information of user about the table tennis rotation, such as sound.
8. the glasses in claim 2 and the claim 3 have eyeglass and also may not have eyeglass.Eyeglass may not have optical correction function (as plano lens), also may have optical correction function (as the previously used eyeglass of user).
9. claim 2, in claim 3 and the claim 6, the number of LED luminous point may be 8 in every glasses inside casing, also may or be less than 8 more than 8.
10. mancarried device, such as glasses, earphone is informed the revolving property of user's table tennis.This mancarried device may obtain other relatively heaviness, the assistance of the device that is not easy to carry.
11. one kind is detected other round (as football, tennis) revolving property, and the mancarried device of informing the user in some way.This mancarried device may obtain other relatively heaviness, the assistance of the device that is not easy to carry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910152253A CN101829424A (en) | 2009-07-07 | 2009-07-07 | Portable pingpong rotation detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910152253A CN101829424A (en) | 2009-07-07 | 2009-07-07 | Portable pingpong rotation detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101829424A true CN101829424A (en) | 2010-09-15 |
Family
ID=42713741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910152253A Pending CN101829424A (en) | 2009-07-07 | 2009-07-07 | Portable pingpong rotation detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101829424A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080059578A1 (en) * | 2006-09-06 | 2008-03-06 | Jacob C Albertson | Informing a user of gestures made by others out of the user's line of sight |
| US20090066907A1 (en) * | 2007-09-10 | 2009-03-12 | Kopren Ted G | Sports vision training device and method |
| US20090109282A1 (en) * | 2007-10-29 | 2009-04-30 | Schnebly Dexter A | Method and apparatus for 3d viewing |
-
2009
- 2009-07-07 CN CN200910152253A patent/CN101829424A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080059578A1 (en) * | 2006-09-06 | 2008-03-06 | Jacob C Albertson | Informing a user of gestures made by others out of the user's line of sight |
| US20090066907A1 (en) * | 2007-09-10 | 2009-03-12 | Kopren Ted G | Sports vision training device and method |
| US20090109282A1 (en) * | 2007-10-29 | 2009-04-30 | Schnebly Dexter A | Method and apparatus for 3d viewing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8574101B2 (en) | Training device to enhance hand-eye coordination | |
| US8831905B2 (en) | Motion capture and analysis | |
| US10478698B2 (en) | Interactive cognitive-multisensory interface apparatus and methods for assessing, profiling, training, and/or improving performance of athletes and other populations | |
| US20140141900A1 (en) | Ir system for kinematic analysis | |
| CN106228143A (en) | A kind of method that instructional video is marked with camera video motion contrast | |
| CN108434664A (en) | A kind of treadmill intelligent safe protector and guard method | |
| US9352206B2 (en) | Video-based system for tennis training incorporating mats | |
| CN108404383B (en) | Reaction force training equipment for martial arts training | |
| CN105854270A (en) | Intelligent system for acquiring motion data on basis of Bluetooth technology | |
| Tan et al. | A review on badminton motion analysis | |
| KR101747056B1 (en) | Skipping rope with led dynamic display function | |
| CN201699843U (en) | Television with pictures capable of rotating along with movement of user | |
| CN101849881A (en) | Short sight rehabilitation inducting method and device | |
| CN101829424A (en) | Portable pingpong rotation detecting device | |
| US20110124445A1 (en) | Video-based system for tennis training | |
| TW202146084A (en) | A portable apparatus, method, and system of golf club swing motion tracking and analysis | |
| CN109621358B (en) | Basketball shooting monitoring auxiliary device | |
| CN204637476U (en) | Intelligent sphere and intelligent sphere charging device | |
| CN106512360B (en) | A kind of table tennis attacking driving teaching exercise machine | |
| Moreno et al. | Visual search strategies of experienced and nonexperienced swimming coaches | |
| TW201135216A (en) | Sensing device for non-contact measuring ball-type falling object | |
| CN213527299U (en) | User interaction system for fitness equipment | |
| US20100118139A1 (en) | Portable Device to Detect the Spin of Table Tennis Ball | |
| CN209278752U (en) | A kind of competitive sports posture grasp shoot device | |
| CN113198155A (en) | Table tennis athlete technical and tactical visual training device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100915 |