CN104730280A - Speed measuring method and system for balls - Google Patents
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- CN104730280A CN104730280A CN201510169371.7A CN201510169371A CN104730280A CN 104730280 A CN104730280 A CN 104730280A CN 201510169371 A CN201510169371 A CN 201510169371A CN 104730280 A CN104730280 A CN 104730280A
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Abstract
The invention discloses a speed measuring method for balls. The method comprises the steps that an image shot by a first detecting face is obtained, when a preset threshold range is satisfied by the gray level change, a first pulse signal is generated; an image shot by a second detecting face is obtained, when a preset threshold range is satisfied by the gray level change, a second pulse signal is generated; the time difference between obtaining the first pulse signal and obtaining the second pulse signal is calculated; a separation distance between the first detecting face and the second detecting face is obtained; the speed of a ball is calculated according to the separation distance and the time difference, and the speed of the ball can be detected simply and conveniently. The invention further discloses a speed measuring system for the balls.
Description
Technical field
The present invention relates to ball speed detection technique field, particularly relate to a kind of ball speed-measuring method and system.
Background technology
In the match of most ball sports, often need to detect ball speed during the games, be convenient to the capable analysis of post-games contrast ABC.At present, in the method carrying out detecting employing to ball speed be, by two groups of collimated laser beams that the multiple laser by equidistantly arrangement in same plane forms, whether detect ball by laser beam, judge the speed of ball thus.Existing this speed-measuring method, need two groups of parallel erections of laser beam, and the plane at laser beam place will be parallel to net, and therefore, the height install laser beam and angle have very high requirement, and slightly deviation just can not complete the detection of ball speed.
Summary of the invention
The invention provides a kind of ball speed-measuring method and system, the speed of ball can be detected simply and easily.
The invention provides a kind of ball speed-measuring method, comprising:
Obtain and take image by the first detection faces, when grey scale change meets preset threshold range, the first pulse signal of generation;
Obtain and take image by the second detection faces, when grey scale change meets preset threshold range, the second pulse signal of generation;
Calculate and obtain described second pulse signal and the mistiming obtaining described first pulse signal;
Obtain the spacing between described first detection faces and described second detection faces;
The speed of ball is calculated according to described spacing and mistiming.
Preferably, generate the first pulse signal when described first detection faces shooting variation of image grayscale meets preset threshold range to comprise:
Obtain the image of described first detection faces of shooting;
Judge whether the pixel difference of described first detection faces (n+1)th two field picture and the n-th two field picture meets preset threshold range, if then:
Generate the first pulse signal.
Preferably, generate the second pulse signal when described second detection faces shooting variation of image grayscale meets preset threshold range to comprise:
Obtain the image of described second detection faces of shooting;
Judge whether the pixel difference of described second detection faces (n+1)th two field picture and the n-th two field picture meets preset threshold range, if then:
Generate the second pulse signal.
Preferably, described preset threshold range is MinPixels<BallPixels<MaxPixels, wherein: BallPixels is ball longitudinal pixel in the picture.
A kind of ball speed velocity-measuring system, comprising: test the speed main frame, described in the main frame that tests the speed comprise:
First acquiring unit, takes image for obtaining by the first detection faces, when grey scale change meets preset threshold range, and the first pulse signal of generation;
Second acquisition unit, takes image for obtaining by the second detection faces, when grey scale change meets preset threshold range, and the second pulse signal of generation;
First computing unit, obtains described second pulse signal and the mistiming obtaining described first pulse signal for calculating;
3rd acquiring unit, for obtaining the spacing between described first detection faces and described second detection faces;
Second computing unit, for calculating the speed of ball according to described spacing and mistiming.
Preferably, described system also comprises: the First Line array camera be connected with the described main frame that tests the speed respectively and the second line-scan digital camera; Wherein:
Described First Line array camera comprises:
4th acquiring unit, for obtaining the image taking described first detection faces;
First judging unit, whether the pixel difference for the (n+1)th two field picture and the n-th two field picture that judge described first detection faces meets preset threshold range;
First generation unit, for when the (n+1)th two field picture of described first detection faces and the pixel difference of the n-th two field picture meet preset threshold range, generates the first pulse signal;
Described second line-scan digital camera comprises:
5th acquiring unit, for obtaining the image taking described second detection faces;
Second judging unit, whether the pixel difference for the (n+1)th two field picture and the n-th two field picture that judge described second detection faces meets preset threshold range;
Second generation unit, for when the (n+1)th two field picture of described second detection faces and the pixel difference of the n-th two field picture meet preset threshold range, generates the second pulse signal.
Preferably, the main frame that tests the speed described in also comprises: the first pilot lamp and the second pilot lamp;
Described first pilot lamp, for lighting when described first acquiring unit gets described first pulse signal;
Described second pilot lamp, for lighting when described second acquisition unit gets described second pulse signal.
Preferably, the main frame that tests the speed described in also comprises: hummer;
Described hummer is used for, and sounds a buzzer when described first acquiring unit gets described first pulse signal or when described second acquisition unit gets described second pulse signal.
Preferably, the main frame that tests the speed described in also comprises display: for showing the speed of the ball calculated.
Preferably, described preset threshold range is MinPixels<BallPixels<MaxPixels, wherein: BallPixels is ball longitudinal pixel in the picture.
From such scheme, the ball speed-measuring method of one provided by the invention, the pulse signal generated by two detection faces shooting variation of image grayscale determines whether ball passes through detection faces, as long as the image that ball warp crosses detection faces can be photographed in the process of shooting, not very high compared to the requirement of prior art to shooting height and angle, therefore, it is possible to detect the speed of ball simply and easily.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The process flow diagram of Fig. 1 a kind of ball speed-measuring method disclosed in the embodiment of the present invention;
The process flow diagram of Fig. 2 a kind of ball speed-measuring method disclosed in another embodiment of the present invention;
The structural representation of Fig. 3 a kind of ball velocity-measuring system disclosed in the embodiment of the present invention;
The structural representation of Fig. 4 a kind of ball velocity-measuring system disclosed in another embodiment of the present invention;
Fig. 5 is the ball principle schematic tested the speed disclosed by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of ball speed-measuring method disclosed in the embodiment of the present invention, comprising:
S101, obtain by first detection faces take image, when grey scale change meets preset threshold range, the first pulse signal of generation;
S102, obtain by second detection faces take image, when grey scale change meets preset threshold range, the second pulse signal of generation;
S103, calculating acquisition second pulse signal and the mistiming obtaining the first pulse signal;
S104, obtain spacing between the first detection faces and the second detection faces;
S105, calculate the speed of ball according to spacing and mistiming.
Concrete, the course of work of above-described embodiment is: when needing to detect the movement velocity of ball, first obtain and take image by the first detection faces, when grey scale change meets preset threshold range, generate the first pulse signal and by second detection faces take image, when grey scale change meets preset threshold range, the second pulse signal of generation, described preset threshold range is the threshold range preset according to the type of ball.Then the mistiming of the time getting the second pulse signal and the time getting the first pulse signal is calculated, then the spacing between the first detection faces and the second detection faces is obtained, described spacing is the parallel distance between the first detection faces and the second detection faces, finally calculates the speed of ball according to spacing and mistiming.
As shown in Figure 2, a kind of ball speed-measuring method disclosed in another embodiment of the present invention, comprising:
The image of S201, acquisition shooting first detection faces;
S202, judge whether the pixel difference of the first detection faces (n+1)th two field picture and the n-th two field picture meets preset threshold range, if then enter step S203:
S203, generate the first pulse signal;
S204, obtain the first pulse signal;
The image of S205, acquisition shooting second detection faces;
S206, judge whether the pixel difference of the second detection faces (n+1)th two field picture and the n-th two field picture meets preset threshold range, if then enter step S207:
S207, generate the second pulse signal;
S208, obtain the second pulse signal;
S209, calculating acquisition second pulse signal and the mistiming obtaining the first pulse signal;
S210, obtain spacing between the first detection faces and the second detection faces;
S211, calculate the speed of ball according to spacing and mistiming.
Concrete, the course of work of above-described embodiment is: when needing to detect the movement velocity of ball, first the image of shooting first detection faces is obtained, then judge whether the pixel difference of the first detection faces (n+1)th two field picture and the n-th two field picture meets preset threshold range, namely judge whether the pixel difference of two two field pictures before and after image meets preset threshold range.Described preset range threshold value is MinPixels<BallPixels<MaxPixels, wherein: MinPixels is the minimum value of ball issuable longitudinal pixel number in the picture; BallPixels is ball longitudinal pixel actual change number in the picture; MaxPixels is the maximal value of ball issuable longitudinal pixel number in the picture, if meet, judges that ball passes through the first detection faces, generates the first pulse signal.
When the pixel difference of judgement first detection faces (n+1)th two field picture and the n-th two field picture is less than MinPixels, namely during BallPixels<MinPixels, show the pixel gray scale of image do not change or the pixel number that changes very little, then continue to keep with the n-th two field picture for benchmark, n-th+2 two field picture and the n-th two field picture are compared, until meet preset threshold range with the pixel difference of the n-th two field picture, then judge that ball is by the first detection faces, generates the first pulse signal.
When the pixel difference of judgement first detection faces (n+1)th two field picture and the n-th two field picture is greater than MaxPixels, namely during BallPexils>MaxPixels, be judged to be that background light changes the grey scale change brought, then continue with the (n+1)th two field picture as benchmark, n-th+2 two field picture and the (n+1)th two field picture are compared, until when the pixel difference of front and back two two field picture meets preset threshold range, namely during MinPixels<BallPixels<MaxPixels, judge that ball is by the first detection faces, generate the first pulse signal.
Then obtain the image of the second detection faces, then judge whether the pixel difference of the second detection faces (n+1)th two field picture and the n-th two field picture meets preset threshold range, namely judge whether the pixel difference of two two field pictures before and after image meets preset threshold range.Described preset range threshold value is MinPixels<BallPixels<MaxPixels, wherein: MinPixels is the minimum value of ball issuable longitudinal pixel number in the picture; BallPixels is ball longitudinal pixel actual change number in the picture; MaxPixels is the maximal value of ball issuable longitudinal pixel number in the picture, if meet, judges that ball passes through the second detection faces, generates the second pulse signal.
When the pixel difference of judgement second detection faces (n+1)th two field picture and the n-th two field picture is less than MinPixels, namely during BallPixels<MinPixels, show the pixel gray scale of image do not change or the pixel number that changes very little, then continue to keep with the n-th two field picture for benchmark, n-th+2 two field picture and the n-th two field picture are compared, until meet preset threshold range with the pixel difference of the n-th two field picture, judge that ball is by the second detection faces, generates the second pulse signal.
When the pixel difference of judgement second detection faces (n+1)th two field picture and the n-th two field picture is greater than MaxPixels, namely during BallPexils>MaxPixels, be judged to be that background light changes the grey scale change brought, then continue with the (n+1)th two field picture as benchmark, n-th+2 two field picture and the (n+1)th two field picture are compared, until when the pixel difference of front and back two two field picture meets preset threshold range, namely during MinPixels<BallPixels<MaxPixels, judge that ball is by the first detection faces, generate the second pulse signal.
Then the mistiming of the time getting the second pulse signal and the time getting the first pulse signal is calculated, then the spacing between the first detection faces and the second detection faces is obtained, described spacing is the parallel distance between the first detection faces and the second detection faces, finally calculates the speed of ball according to spacing and mistiming.
As shown in Figure 3, a kind of ball velocity-measuring system disclosed in the embodiment of the present invention, comprise: test the speed main frame 31, the main frame 31 that wherein tests the speed comprises: the first acquiring unit 311, second acquisition unit 312, first computing unit 313, the 3rd acquiring unit 314 and the second computing unit 315; Wherein:
First acquiring unit 311, takes image for obtaining by the first detection faces, when grey scale change meets preset threshold range, and the first pulse signal of generation;
Second acquisition unit 312, takes image for obtaining by the second detection faces, when grey scale change meets preset threshold range, and the second pulse signal of generation;
First computing unit 313, for calculating acquisition second pulse signal and the mistiming obtaining the first pulse signal;
3rd acquiring unit 314, for obtaining the spacing between the first detection faces and the second detection faces;
Second computing unit 315, for calculating the speed of ball according to spacing and mistiming.
Concrete, the principle of work of above-described embodiment is: when needing to detect the movement velocity of ball, first obtained by the first acquiring unit 311 and take image by the first detection faces, when grey scale change meets preset threshold range, the first pulse signal generated, is obtained by second acquisition unit 312 and takes image, when grey scale change meets preset threshold range by the second detection faces, the second pulse signal generated, described preset threshold range is the threshold range preset according to the type of ball.Then the mistiming of the time getting the second pulse signal and the time getting the first pulse signal is calculated by the first computing unit 313, then the spacing between the first detection faces and the second detection faces is obtained by the 3rd acquiring unit 314, described spacing is the parallel distance between the first detection faces and the second detection faces, calculates the speed of ball finally by the second computing unit 315 according to spacing and mistiming.
As shown in Figure 4, a kind of ball velocity-measuring system disclosed in another embodiment of the present invention, comprising: the main frame 41 that tests the speed, First Line array camera 42 and the second line-scan digital camera 43; First Line array camera 42 is connected with the main frame 41 that tests the speed respectively with the second line-scan digital camera 43;
First Line array camera 42 comprises:
4th acquiring unit 421, for obtaining the image of shooting first detection faces;
First judging unit 422, whether the pixel difference for the (n+1)th two field picture and the n-th two field picture that judge the first detection faces meets preset threshold range;
First generation unit 423, for when the (n+1)th two field picture of the first detection faces and the pixel difference of the n-th two field picture meet preset threshold range, generates the first pulse signal;
Second line-scan digital camera 43 comprises:
5th acquiring unit 431, for obtaining the image of shooting second detection faces;
Second judging unit 432, whether the pixel difference for the (n+1)th two field picture and the n-th two field picture that judge the second detection faces meets preset threshold range;
Second generation unit 433, for when the (n+1)th two field picture of the second detection faces and the pixel difference of the n-th two field picture meet preset threshold range, generates the second pulse signal;
The main frame 41 that tests the speed comprises:
First acquiring unit 411, takes image for obtaining by the first detection faces, when grey scale change meets preset threshold range, and the first pulse signal of generation;
Second acquisition unit 412, takes image for obtaining by the second detection faces, when grey scale change meets preset threshold range, and the second pulse signal of generation;
First computing unit 413, for calculating acquisition second pulse signal and the mistiming obtaining described first pulse signal;
3rd acquiring unit 414, for obtaining the spacing between the first detection faces and described second detection faces;
Second computing unit 415, for calculating the speed of ball according to spacing and mistiming;
First pilot lamp 416, for lighting when the first acquiring unit 411 gets the first pulse signal;
Second pilot lamp 417, for lighting when second acquisition unit 412 gets the second pulse signal;
Hummer 418, for sounding a buzzer when the first acquiring unit 411 gets the first pulse signal or when second acquisition unit 412 gets the second pulse signal;
Display 419, for showing the speed of the ball calculated.
Concrete, the principle of work of above-described embodiment is: when needing to detect the movement velocity of ball, as shown in Figure 5, First Line array camera 42 and the second line-scan digital camera 43 are erected at directly over competition area or above side, adjustment First Line array camera 42 and three line scanner camera 43, make the shooting face of camera vertical with the X-axis of competition area.During installation, line-scan digital camera can be connected to computing machine, Real Time Observation shooting image, determines shooting face, namely according to line-scan digital camera shooting image, determines surveyed area.Can determine the space (diffusion angle) of location according to the adjustment of line-scan digital camera lens focus, reduce the inactive area of both sides, too much inactive area can disturb camera calibration, causes erroneous judgement.Adjustment First Line array camera 42 and the second line-scan digital camera 43, first detection faces and the second detection faces are parallel to each other, guarantee that the spacing of First Line array camera 42 and the second line-scan digital camera 43 equals the spacing d of two detection faces, adjust i.e. fixed camera, irremovable camera position in measurement.
Then, the image of ball by the first detection faces is taken by First Line array camera 42, the image of shooting first detection faces is obtained by the 4th acquiring unit 421, then judge whether the (n+1)th two field picture of the first detection faces and the pixel difference of the n-th two field picture meet preset threshold range by the first judging unit 422, namely judge whether the pixel difference of two two field pictures before and after image meets preset threshold range.Described preset range threshold value is MinPixels<BallPixels<MaxPixels, wherein: MinPixels is the minimum value of ball issuable longitudinal pixel number in the picture; BallPixels is ball longitudinal pixel actual change number in the picture; MaxPixels is the maximal value of ball issuable longitudinal pixel number in the picture, if meet, judge that ball passes through the first detection faces, the first generation unit 423 generates the first pulse signal, and the first pulse signal is sent to the connected main frame 41 that tests the speed.
When the pixel difference of judgement first detection faces (n+1)th two field picture and the n-th two field picture is less than MinPixels, namely during BallPixels<MinPixels, show the pixel gray scale of image do not change or the pixel number that changes very little, then continue to keep with the n-th two field picture for benchmark, n-th+2 two field picture and the n-th two field picture are compared, until meet preset threshold range with the pixel difference of the n-th two field picture, judge that ball is by the first detection faces, first generation unit 423 generates the first pulse signal, and the first pulse signal is sent to the connected main frame 41 that tests the speed.
When the pixel difference of judgement first detection faces (n+1)th two field picture and the n-th two field picture is greater than MaxPixels, namely during BallPexils>MaxPixels, be judged to be that background light changes the grey scale change brought, then continue with the (n+1)th two field picture as benchmark, n-th+2 two field picture and the (n+1)th two field picture are compared, until when the pixel difference of front and back two two field picture meets preset threshold range, namely during MinPixels<BallPixels<MaxPixels, judge that ball is by the first detection faces, first generation unit 423 generates the first pulse signal, and the first pulse signal is sent to the connected main frame 41 that tests the speed.
Then the image of ball by the second detection faces is taken by the second line-scan digital camera 43, the image of shooting second detection faces is obtained by the 5th acquiring unit 431, then judge whether the (n+1)th two field picture of the second detection faces and the pixel difference of the n-th two field picture meet preset threshold range by the second judging unit 432, namely judge whether the pixel difference of two two field pictures before and after image meets preset threshold range.Described preset range threshold value is MinPixels<BallPixels<MaxPixels, wherein: MinPixels is the minimum value of ball issuable longitudinal pixel number in the picture; BallPixels is ball longitudinal pixel actual change number in the picture; MaxPixels is the maximal value of ball issuable longitudinal pixel number in the picture, if meet, judge that ball passes through the first detection faces, the second generation unit 433 generates the first pulse signal, and the first pulse signal is sent to the connected main frame 41 that tests the speed.
When the pixel difference of judgement second detection faces (n+1)th two field picture and the n-th two field picture is less than MinPixels, namely during BallPixels<MinPixels, show the pixel gray scale of image do not change or the pixel number that changes very little, then continue to keep with the n-th two field picture for benchmark, n-th+2 two field picture and the n-th two field picture are compared, until meet preset threshold range with the pixel difference of the n-th two field picture, judge that ball is by the first detection faces, second generation unit 433 generates the first pulse signal, and the first pulse signal is sent to the connected main frame 41 that tests the speed.
When the pixel difference of judgement second detection faces (n+1)th two field picture and the n-th two field picture is greater than MaxPixels, namely during BallPexils>MaxPixels, be judged to be that background light changes the grey scale change brought, then continue with the (n+1)th two field picture as benchmark, n-th+2 two field picture and the (n+1)th two field picture are compared, until when the pixel difference of front and back two two field picture meets preset threshold range, namely during MinPixels<BallPixels<MaxPixels, judge that ball is by the first detection faces, second generation unit 433 generates the first pulse signal, and the first pulse signal is sent to the connected main frame 41 that tests the speed.
Then the first acquiring unit 411 tested the speed in main frame 41 obtains the first pulse signal, and when the first acquiring unit 411 gets the first pulse signal, the first pilot lamp 416 is lighted, and hummer 418 is sounded a buzzer.Second acquisition unit 412 obtains the second pulse signal, and when second acquisition unit 412 gets the second pulse signal, the second pilot lamp 417 is lighted, and hummer 418 is sounded a buzzer.First computing unit 413 calculates acquisition second pulse signal and the mistiming obtaining the first pulse signal, 3rd acquiring unit 414 obtains the spacing d between the first detection faces and described second detection faces, second computing unit 415 calculates the speed of ball according to spacing and mistiming, and shows the speed of the ball calculated by display 419.
If the function described in the present embodiment method using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computing equipment read/write memory medium.Based on such understanding, the part of the part that the embodiment of the present invention contributes to prior art or this technical scheme can embody with the form of software product, this software product is stored in a storage medium, comprising some instructions in order to make a computing equipment (can be personal computer, server, mobile computing device or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, ROM (read-only memory) (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various can be program code stored medium.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, between each embodiment same or similar part mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a ball speed-measuring method, is characterized in that, comprising:
Obtain and take image by the first detection faces, when grey scale change meets preset threshold range, the first pulse signal of generation;
Obtain and take image by the second detection faces, when grey scale change meets preset threshold range, the second pulse signal of generation;
Calculate and obtain described second pulse signal and the mistiming obtaining described first pulse signal;
Obtain the spacing between described first detection faces and described second detection faces;
The speed of ball is calculated according to described spacing and mistiming.
2. method according to claim 1, is characterized in that, generates the first pulse signal and comprise when described first detection faces shooting variation of image grayscale meets preset threshold range:
Obtain the image of described first detection faces of shooting;
Judge whether the pixel difference of described first detection faces (n+1)th two field picture and the n-th two field picture meets preset threshold range, if then:
Generate the first pulse signal.
3. method according to claim 1, is characterized in that, generates the second pulse signal and comprise when described second detection faces shooting variation of image grayscale meets preset threshold range:
Obtain the image of described second detection faces of shooting;
Judge whether the pixel difference of described second detection faces (n+1)th two field picture and the n-th two field picture meets preset threshold range, if then:
Generate the second pulse signal.
4. method according to claim 1, is characterized in that, described preset threshold range is MinPixels<BallPixels<MaxPixels, wherein: BallPixels is ball longitudinal pixel in the picture.
5. a ball speed velocity-measuring system, is characterized in that, comprising: test the speed main frame, described in the main frame that tests the speed comprise:
First acquiring unit, takes image for obtaining by the first detection faces, when grey scale change meets preset threshold range, and the first pulse signal of generation;
Second acquisition unit, takes image for obtaining by the second detection faces, when grey scale change meets preset threshold range, and the second pulse signal of generation;
First computing unit, obtains described second pulse signal and the mistiming obtaining described first pulse signal for calculating;
3rd acquiring unit, for obtaining the spacing between described first detection faces and described second detection faces;
Second computing unit, for calculating the speed of ball according to described spacing and mistiming.
6. system according to claim 5, is characterized in that, also comprises: the First Line array camera be connected with the described main frame that tests the speed respectively and the second line-scan digital camera; Wherein:
Described First Line array camera comprises:
4th acquiring unit, for obtaining the image taking described first detection faces;
First judging unit, whether the pixel difference for the (n+1)th two field picture and the n-th two field picture that judge described first detection faces meets preset threshold range;
First generation unit, for when the (n+1)th two field picture of described first detection faces and the pixel difference of the n-th two field picture meet preset threshold range, generates the first pulse signal;
Described second line-scan digital camera comprises:
5th acquiring unit, for obtaining the image taking described second detection faces;
Second judging unit, whether the pixel difference for the (n+1)th two field picture and the n-th two field picture that judge described second detection faces meets preset threshold range;
Second generation unit, for when the (n+1)th two field picture of described second detection faces and the pixel difference of the n-th two field picture meet preset threshold range, generates the second pulse signal.
7. system according to claim 6, is characterized in that, described in the main frame that tests the speed also comprise: the first pilot lamp and the second pilot lamp;
Described first pilot lamp, for lighting when described first acquiring unit gets described first pulse signal;
Described second pilot lamp, for lighting when described second acquisition unit gets described second pulse signal.
8. system according to claim 7, is characterized in that, described in the main frame that tests the speed also comprise: hummer;
Described hummer, for sounding a buzzer when described first acquiring unit gets described first pulse signal or when described second acquisition unit gets described second pulse signal.
9. system according to claim 8, is characterized in that, described in the main frame that tests the speed also comprise display: for showing the speed of the ball calculated.
10. system according to claim 5, is characterized in that, described preset threshold range is MinPixels<BallPixels<MaxPixels, wherein: BallPixels is ball longitudinal pixel in the picture.
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| CN201510169371.7A CN104730280A (en) | 2015-04-10 | 2015-04-10 | Speed measuring method and system for balls |
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| CN201510169371.7A CN104730280A (en) | 2015-04-10 | 2015-04-10 | Speed measuring method and system for balls |
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| CN108227044A (en) * | 2018-01-26 | 2018-06-29 | 中国科学院大气物理研究所 | A kind of raindrop measuring device and method based on twin-line array |
| WO2018140547A1 (en) * | 2017-01-25 | 2018-08-02 | Carrier Corporation | Line array detection and imaging system |
| US11828905B2 (en) | 2018-01-26 | 2023-11-28 | Institute Of Atmospheric Physics, Chinese Academy Of Sciences | Dual line diode array device and measurement method and measurement device for particle velocity |
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| JP7157763B2 (en) | 2017-01-25 | 2022-10-20 | キャリア コーポレイション | Line array detection and imaging system |
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