A video timing system for swimming competitions

Abstract

The present invention relates to the field of video timing technology, and in particular to a video timing system for swimming competitions, comprising: a position recognition module for identifying the position of a swimmer; a timing module comprising a timing unit and a frequency modulator; a data processing module for processing the position of the swimmer and the swimming time of the swimmer respectively to output competition feature data; a control module for adjusting the resolution of image processing according to the missing amount ratio of the competition feature data, or adjusting the audit frequency of competition cleaning data according to the average timing jump amount of the timing unit, and adjusting the working frequency of the frequency modulator according to the timing difference amount of the timing module, and performing secondary adjustment on the working frequency of the frequency modulator according to the signal-to-noise ratio of the on-site image. The present invention achieves an improvement in the timing accuracy of a photoelectric timer.

Description

Technical Field

[0001] The invention relates to the technical field of video timing, and in particular to a video timing system for swimming competitions. Background Art

[0002] The video timing system for swimming competitions is a device used to measure and record the competition time of swimmers. It usually uses a high-speed camera and professional timing software to capture the moment when the swimmers take off and reach the finish line with high accuracy and speed, and accurately calculate and record the competition time.

[0003] China Patent Publication No.: CN104408787A discloses a swimming pool sports performance timing system and timing method based on the Internet of Things, including a radio frequency tag module with a unique identifier; a position identification module placed at both ends of the swimming lane, each position identification module reads a unique identifier from the radio frequency tag module worn by the swimmer through a first radio frequency reader; the unique identifier of the radio frequency tag module read is transmitted to the server through a first communication submodule; and a performance query module and a performance display screen. The present invention sets a position identification module at both ends of the swimming lane, obtains the identifier of the radio frequency tag module worn by the swimmer by using the first radio frequency reader, and uniformly records the swimming results corresponding to the radio frequency tag module through the server, so as to record the results of all swimmers in the swimming pool at the same time; the per capita use cost is almost negligible, and the timing accuracy can reach within 0.01s, so as to well meet the timing requirements of various indoor and outdoor swimming pools. It can be seen that the swimming pool sports performance timing system and timing method based on the Internet of Things have the problem that the image resolution is too high in order to capture more details, resulting in too much memory occupied by image processing, resulting in a decrease in the accuracy of timing. Summary of the invention

[0004] To this end, the present invention provides a video timing system for swimming competitions, which is used to overcome the problem in the prior art that in order to capture more details, the image resolution is too high, resulting in excessive memory usage for image processing and reduced timing accuracy.

[0005] To achieve the above-mentioned object, the present invention provides a video timing system for swimming competitions, comprising: a position recognition module for identifying the position of a swimmer, comprising an image acquisition unit for acquiring on-site images, and a positioning unit connected to the image acquisition unit for analyzing the on-site images to determine the real-time position of the swimmer; a timing module connected to the position recognition module, comprising a timing unit connected to the positioning unit for recording the swimming time of the swimmer and a frequency modulator connected to the timing unit for synchronizing the timing signal of the timing unit with the on-site image signal of the image acquisition unit; a data processing module, which is respectively connected to the position recognition module and the timing module, and is respectively connected to the position recognition module and the timing module, and is respectively connected to the position recognition module and the timing module, and is respectively connected to the position recognition module and the positioning unit ... The swimming time of the swimmer is processed to output competition feature data, including an audit component for checking erroneous data in the competition cleaning data output by the preprocessing process; a control module is respectively connected to the position identification module, the data processing module and the timing module, and is used to adjust the resolution of image processing according to the missing amount ratio of the competition feature data, or, according to the missing amount ratio of the competition feature data and the average timing jump amount of the timing unit, to adjust the audit frequency of the competition cleaning data, and, according to the average timing jump amount of the timing unit and the timing difference amount of the timing module, to adjust the working frequency of the frequency modulator, and, according to the signal-to-noise ratio of the scene image, to perform secondary adjustment on the working frequency of the frequency modulator.

[0006] Furthermore, the competition characteristic data includes an average swimming speed of each swimmer, a swimming distance of each swimmer, and a competition duration of each swimmer.

[0007] Furthermore, the control module obtains the number of missing competition feature data and the total number of competition feature data per unit time to calculate the proportion of missing competition feature data.

[0008] The control module determines that the timing accuracy does not meet the requirement under the first ratio condition, and reduces the resolution of image processing.

[0009] Among them, the first proportion condition is that the missing amount proportion of the competition feature data is greater than the preset second proportion.

[0010] Furthermore, the resolution of the reduced image processing is determined by the difference between the missing amount ratio of the competition feature data and the preset second ratio.

[0011] Further, the control module preliminarily determines that the validity of data processing does not meet the requirements under the second proportion condition, and obtains the incremental amount of the timing value when the jump occurs in the unit time and the number of timing jumps in the unit time to calculate the average timing jump amount of the timing unit.

[0012] The control module determines that the validity of data processing does not meet the requirements under the first jump variable condition, and increases the audit frequency of the competition cleaning data.

[0013] Among them, the second proportion is that the proportion of missing amount of the competition feature data is greater than the preset first proportion and less than or equal to the preset second proportion; the first jump quantity condition is that the average timing jump quantity of the timing unit is greater than the preset second jump quantity.

[0014] Furthermore, the audit frequency of the increased competition cleaning data is determined by the difference between the average timing jump amount of the timing unit and the preset second jump amount.

[0015] Furthermore, the control module preliminarily determines that the working stability of the photoelectric timer does not meet the requirements under the second jump variable condition, and respectively obtains the swimming time of the swimmer recorded by the timing module and the actual swimming time of the swimmer in the scene image to calculate the timing difference of the timing module.

[0016] The control module determines for the second time that the working stability of the photoelectric timer does not meet the requirements under the preset difference amount condition, and increases the working frequency of the frequency modulator.

[0017] The second jump amount condition is that the average timing jump amount of the timing unit is greater than the preset first jump amount and less than or equal to the preset second jump amount; the preset difference amount condition is that the timing difference amount of the timing module is greater than the preset difference amount.

[0018] Furthermore, the increased operating frequency of the frequency modulator is determined by the difference between the timing difference of the timing module and the preset difference.

[0019] Further, under the first condition, the control module uses a video analyzer connected to the image acquisition unit to respectively acquire the power of the scene image signal and the power of the noise signal in the scene image to calculate the signal-to-noise ratio of the scene image.

[0020] The control module determines that the effectiveness of image transmission does not meet the requirements under the preset signal-to-noise ratio condition, and reduces the working frequency of the frequency modulator.

[0021] The preset signal-to-noise ratio is that the signal-to-noise ratio of the scene image is less than the preset signal-to-noise ratio; and the first condition is to complete the increase of the operating frequency of the frequency modulator.

[0022] Furthermore, the reduced operating frequency of the frequency modulator is determined by a difference between the preset signal-to-noise ratio and the signal-to-noise ratio of the scene image.

[0023] Compared with the prior art, the beneficial effect of the present invention lies in that the timing system of the present invention reduces the resolution of image processing according to the proportion of missing competition feature data by setting a position recognition module, a data processing module, a timing module and a control module. In order to capture more details of the swimmer's limb movements during the competition, the image resolution is too high, so that the memory occupied by the image processing process is too large, and the memory for storing the recorded data of the swimming time is too small, and the swimmer's swimming time data is lost, resulting in the number of missing competition feature data in an inaccurate timing state. The image resolution is reduced to increase the memory for storing the recorded data of the swimming time, thereby improving the timing accuracy; the audit frequency of the competition cleaning data is increased according to the average timing jump variable of the timing unit, and the error update is not timely, so that the error cannot be discovered in time when the competition image data is audited, and the effectiveness of data processing is reduced. The audit frequency of the competition cleaning data is increased to improve the effectiveness of error identification, thereby improving the effectiveness of data processing, and further realizing the improvement of the timing accuracy of the photoelectric timer.

[0024] Furthermore, the timing system of the present invention reduces the resolution of image processing according to the missing amount ratio of competition feature data by setting a preset first ratio and a preset second ratio. In order to capture more details of the swimmer's body movements during the competition, the image resolution is too high, so that the memory occupied by the image processing process is too large, and the memory for storing competition timing data is too small, so that the competition timing data is lost, resulting in inaccurate timing. The image resolution is reduced to increase the memory for storing competition timing data, thereby improving the accuracy of timing, and further achieving an improvement in the timing accuracy of the photoelectric timer.

[0025] Furthermore, the timing system of the present invention sets a preset first jump value and a preset second jump value, and increases the audit frequency of the competition cleaning data according to the average timing jump value of the timing unit. The error update is not timely, so that the error cannot be discovered in time when the competition image data is audited, the system responds slowly to the actual time change, and the effectiveness of data processing decreases. The audit frequency of the competition cleaning data is increased to improve the effectiveness of error identification, thereby improving the effectiveness of data processing, and further achieving the improvement of the timing accuracy of the photoelectric timer.

[0026] Furthermore, the timing system of the present invention sets a preset difference and increases the operating frequency of the frequency modulator according to the timing difference of the timing module. The aging of the circuit of the photoelectric timer causes errors during operation, which causes a frequency misalignment between the swimmer's swimming time and the swimmer's position, causes a deviation in the time recorded by the photoelectric timer, and the photoelectric sensor is in an unstable state. The operating frequency of the frequency modulator is increased to improve the timing accuracy of the photoelectric timer, thereby improving the working stability of the photoelectric timer, and further achieving an improvement in the timing accuracy of the photoelectric timer.

[0027] Furthermore, the present invention sets a preset signal-to-noise ratio and reduces the operating frequency of the frequency modulator according to the signal-to-noise ratio of the on-site image. If the operating frequency of the frequency modulator is too high, distortion will occur during the transmission of the on-site image, causing the signal-to-noise ratio of the on-site image to increase abnormally. The operating frequency of the frequency modulator is reduced to reduce the signal-to-noise ratio of the on-site image, thereby further improving the timing accuracy of the photoelectric timer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an overall structural block diagram of a video timing system for a swimming competition according to an embodiment of the present invention;

[0029] Figure 2 A specific structural block diagram of a data processing module of a video timing system for a swimming competition according to an embodiment of the present invention;

[0030] Figure 3 A specific structural block diagram of a position identification module of a video timing system for a swimming competition according to an embodiment of the present invention;

[0031] Figure 4 The figure is a specific structural block diagram of a timing module of a video timing system for a swimming competition according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0034] It should be pointed out that the data in this embodiment are obtained by the video timing system for swimming competitions of the present invention based on historical test data and data statistics, experiments and comprehensive analysis based on experimental results before the current use; the video timing system for swimming competitions of the present invention is based on the percentage of missing amount of 1672 cases of competition feature data accumulated statistics, tests and calculations within 90 days, the average timing jump amount of the timing unit, the timing difference amount of the timing module and the signal-to-noise ratio of the scene image, and comprehensively determines the values ​​of various preset parameter standards for the video timing system of the swimming competition. It can be understood by those skilled in the art that the video timing system for swimming competitions of the present invention can determine the above parameters for a single item by selecting the value with the highest proportion as the preset standard parameter according to the data distribution, as long as the system of the present invention can clearly define different specific situations in the single item determination process through the obtained values.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown in the figure, they are respectively an overall structural block diagram of a video timing system for swimming competitions according to an embodiment of the present invention, a specific structural block diagram of a data processing module, a specific structural block diagram of a position identification module, and a specific structural block diagram of a timing module. A video timing system for swimming competitions according to the present invention comprises:

[0037] A position identification module, used to identify the position of the swimmer, including an image acquisition unit for acquiring a live image, and a positioning unit connected to the image acquisition unit for analyzing the live image to determine the real-time position of the swimmer;

[0038] A timing module connected to the position identification module, comprising a timing unit connected to the positioning unit for recording the swimming time of the swimmer and a frequency modulator connected to the timing unit for synchronizing the timing signal of the timing unit with the on-site image signal of the image acquisition unit;

[0039] a data processing module, which is connected to the position identification module and the timing module respectively, and is used to process the position of the swimmer and the swimming time of the swimmer respectively to output competition characteristic data, including an audit component for checking error data in the competition cleaning data output by the preprocessing process;

[0040] A control module, which is respectively connected to the position identification module, the data processing module and the timing module, is used to adjust the resolution of image processing according to the missing amount ratio of the competition feature data, or to adjust the audit frequency of the competition cleaning data according to the missing amount ratio of the competition feature data and the average timing jump amount of the timing unit,

[0041] Furthermore, the operating frequency of the frequency modulator is adjusted according to the average timing jump amount of the timing unit and the timing difference amount of the timing module, and the operating frequency of the frequency modulator is adjusted for the second time according to the signal-to-noise ratio of the scene image.

[0042] Specifically, the competition characteristic data includes the average swimming speed of each swimmer, the swimming distance of each swimmer, and the competition time of each swimmer.

[0043] Specifically, erroneous data includes duplicate data and missing data.

[0044] Specifically, the missing data included incomplete information about the swimmers’ swimming positions and incomplete live images of the swimmers.

[0045] Specifically, the image acquisition unit includes several cameras.

[0046] Specifically, the cameras are installed directly above, on the side of the competition venue, and below the swimming pool.

[0047] Specifically, the timing unit includes photoelectric timers respectively arranged at the starting point and the end point of the swimming track.

[0048] Specifically, the operating frequency of the frequency modulator is the number of synchronizations between the timing signal of the timing unit and the field image signal of the image acquisition unit within a unit time.

[0049] Specifically, the synchronization of the timing signal and the image signal means aligning the time between the swimmer's competition duration recorded by the photoelectric timer and the live image captured by the camera.

[0050] Specifically, the data processing module also includes:

[0051] A preprocessing component, which is connected to the audit module and is used to clean and denoise the competition image data to output competition cleaned data;

[0052] A computing component is connected to the audit module and is used to calculate the audited competition cleansing data to output competition feature data.

[0053] In implementation, the timing system of the present invention reduces the resolution of image processing according to the proportion of missing competition feature data by setting a position recognition module, a data processing module, a timing module and a control module. In order to capture more details of the swimmer's body movements during the competition, the image resolution is too high, so that the memory occupied by the image processing process is too large, and the memory for storing the recorded data of the swimming time is too small, and the swimmer's swimming time data is lost, resulting in the missing amount of competition feature data in an inaccurate timing state. The image resolution is reduced to increase the memory for storing the recorded data of the swimming time, thereby improving the timing accuracy; the audit frequency of the competition cleaning data is increased according to the average timing jump variable of the timing unit, and the error update is not timely, so that the error cannot be discovered in time when the competition image data is audited, and the effectiveness of data processing is reduced. The audit frequency of the competition cleaning data is increased to improve the effectiveness of error identification, thereby improving the effectiveness of data processing, and further achieving the improvement of the timing accuracy of the photoelectric timer.

[0054] Specifically, the control module obtains the number of missing competition feature data and the total number of competition feature data per unit time to calculate the proportion of missing competition feature data.

[0055] The control module determines that the timing accuracy does not meet the requirement under the first ratio condition, and reduces the resolution of image processing.

[0056] Among them, the first proportion condition is that the missing amount proportion of the competition feature data is greater than the preset second proportion.

[0057] Specifically, the reduced resolution E' of the image processing is determined by the difference ΔQ between the missing amount proportion Q of the competition feature data and the preset second proportion Q2.

[0058] Specifically, the formula for calculating the percentage of missing competition feature data is:

[0059] ,

[0060] Among them, Q is the percentage of missing competition feature data, A1 is the number of missing competition feature data, and A2 is the total number of competition feature data.

[0061] Optionally, a preferred embodiment of the preset second proportion Q2 is 0.5.

[0062] Specifically, △Q=Q-Q2, and the control module is provided with preset basic difference values ​​of proportion △Q0 and △Q0. The preferred embodiment is that △Q0=0.1.

[0063] Specifically, the specific process of determining the resolution of the reduced image processing is:

[0064] If △Q≤△Q0, the control module adjusts the image resolution using a preset first resolution adjustment coefficient α1;

[0065] If ΔQ>ΔQ0, the control module uses a preset second resolution adjustment coefficient α2 to adjust the image resolution.

[0066] Specifically, the preferred embodiment of the preset first resolution adjustment coefficient is α1=0.8, and the preferred embodiment of the preset second resolution adjustment coefficient is α2=0.9, wherein 0<α1<α2<1, and the resolution of the reduced image processing is recorded as E', and the calculation formula of E' is E'=E×αi, wherein αi is the preset i-th resolution adjustment coefficient, and i=1,2 is set.

[0067] In implementation, the timing system of the present invention reduces the resolution of image processing according to the missing amount ratio of competition feature data by setting a preset first ratio and a preset second ratio. In order to capture more details of the swimmer's limb movements during the competition, the image resolution is too high, so that the memory occupied by the image processing process is too large, and the memory for storing competition timing data is too small, so that the competition timing data is lost, resulting in inaccurate timing. The image resolution is reduced to increase the memory for storing competition timing data, thereby improving the accuracy of timing, and further achieving an improvement in the timing accuracy of the photoelectric timer.

[0068] Specifically, the control module preliminarily determines that the validity of data processing does not meet the requirements under the second proportion condition, and obtains the incremental amount of the timing value when the jump occurs in the unit time and the number of timing jumps in the unit time to calculate the average timing jump amount of the timing unit.

[0069] The control module determines that the validity of data processing does not meet the requirements under the first jump variable condition, and increases the audit frequency of the competition cleaning data.

[0070] Among them, the second proportion is that the proportion of missing amount of the competition feature data is greater than the preset first proportion and less than or equal to the preset second proportion; the first jump quantity condition is that the average timing jump quantity of the timing unit is greater than the preset second jump quantity.

[0071] Specifically, the increased audit frequency D' of the competition cleaning data is determined by the difference ΔS between the average timing jump amount S of the timing unit and the preset second jump amount S2.

[0072] Specifically, the calculation formula for the average timing jump of the timing unit is:

[0073] ,

[0074] Among them, S is the average timing jump of the timing unit, is the increment of the timing value when the jump occurs for the xth time per unit time, and y is the number of jumps per unit time.

[0075] Specifically, the timing jump means that the increment of the timing value is greater than 1s during the timing process, for example, the timing value jumps directly from 12s to 14s during the timing process, and the increment of the timing value is 2s.

[0076] Optionally, a preferred embodiment of the preset first proportion Q1 is 0.3, and a preferred embodiment of the preset second jump value S2 is S2=1.5s.

[0077] Specifically, △S=S-S2, a preset number of jump difference values ​​△S0 is set in the control module, and a preferred embodiment of △S0 is △S0=0.1.

[0078] Specifically, the specific process for determining the audit frequency of the increased competition cleaning data is as follows:

[0079] If △S≤△S0, the control module uses the preset first audit frequency adjustment coefficient β1 to adjust the audit frequency of the competition cleaning data;

[0080] If △S>△S0, the control module uses the preset second audit frequency adjustment coefficient β2 to adjust the audit frequency of the competition cleaning data.

[0081] Specifically, 1<β1<β2, the preferred embodiment of the preset first audit frequency adjustment coefficient is β1=1.2, the preferred embodiment of the preset second audit frequency adjustment coefficient is β2=1.4, and D'=D×(1+βk) / 2 is set, wherein βk is the preset kth audit frequency adjustment coefficient, and k is set to 1, 2.

[0082] In implementation, the timing system of the present invention sets a preset first jump variable and a preset second jump variable, and increases the audit frequency of the competition cleaning data according to the average timing jump variable of the timing unit. The error update is not timely, so that the error cannot be discovered in time when the competition image data is audited, the system responds slowly to the actual time change, and the effectiveness of data processing decreases. The audit frequency of the competition cleaning data is increased to improve the effectiveness of error identification, thereby improving the effectiveness of data processing, and further achieving the improvement of the timing accuracy of the photoelectric timer.

[0083] Specifically, the control module preliminarily determines that the working stability of the photoelectric timer does not meet the requirements under the second jump variable condition, and obtains the swimming time of the swimmer recorded by the timing module and the actual swimming time of the swimmer in the scene image to calculate the timing difference of the timing module.

[0084] The control module determines for the second time that the working stability of the photoelectric timer does not meet the requirements under the preset difference amount condition, and increases the working frequency of the frequency modulator.

[0085] The second jump amount condition is that the average timing jump amount of the timing unit is greater than the preset first jump amount and less than or equal to the preset second jump amount; the preset difference amount condition is that the timing difference amount of the timing module is greater than the preset difference amount.

[0086] Specifically, the increased operating frequency T' of the frequency modulator is determined by the difference ΔR between the timing difference R of the timing module and the preset difference R0.

[0087] Specifically, the calculation formula of the timing difference of the timing module is:

[0088] ,

[0089] Among them, R is the timing difference of the timing module, C1 is the swimming time of the swimmer recorded by the timing module, and C2 is the actual swimming time of the swimmer in the scene image.

[0090] Optionally, a preferred embodiment of the preset first jump amount S1 is S1=1.3s, and a preferred embodiment of the preset difference amount R0 is 2s.

[0091] Specifically, △R=R-R0, a preset difference value △R0 is provided in the control module, and a preferred embodiment of △R0 is △R0=1.5s.

[0092] Specifically, the specific process of determining the increased operating frequency of the frequency modulator is as follows:

[0093] If △R≤△R0, the control module uses the preset first operating frequency adjustment coefficient γ1 to adjust the operating frequency of the frequency modulator;

[0094] If ΔR>ΔR0, the control module uses the preset second operating frequency adjustment coefficient γ2 to adjust the operating frequency of the frequency modulator.

[0095] Specifically, 1<γ1<γ2, the preferred embodiment of the preset first operating frequency adjustment coefficient γ1 is γ1=1.1, and the preferred embodiment of the preset second operating frequency adjustment coefficient γ2 is γ2=1.2, wherein the corresponding filtering amplitude is recorded as T', and T'=T×γP is set, wherein γP is the preset pth operating frequency adjustment coefficient, and p is set to 1,2.

[0096] In implementation, the timing system of the present invention sets a preset difference amount, and increases the working frequency of the frequency modulator according to the timing difference amount of the timing module. The aging of the circuit of the photoelectric timer causes errors during operation, which causes the frequency misalignment of the swimmer's swimming time and the swimmer's position, and the time recorded by the photoelectric timer is deviated. The photoelectric sensor is in an unstable state, and the working frequency of the frequency modulator is increased to improve the timing accuracy of the photoelectric timer, thereby improving the working stability of the photoelectric timer, and further realizing the improvement of the timing accuracy of the photoelectric timer.

[0097] Specifically, the control module uses a video analyzer connected to the image acquisition unit to respectively acquire the power of the scene image signal and the power of the noise signal in the scene image under the first condition to calculate the signal-to-noise ratio of the scene image.

[0098] The control module determines that the effectiveness of image transmission does not meet the requirements under the preset signal-to-noise ratio condition, and reduces the working frequency of the frequency modulator.

[0099] The preset signal-to-noise ratio is that the signal-to-noise ratio of the scene image is less than the preset signal-to-noise ratio; and the first condition is to complete the increase of the operating frequency of the frequency modulator.

[0100] Optionally, the reduced operating frequency T" of the frequency modulator is determined by a difference ΔW between a preset signal-to-noise ratio W0 and a signal-to-noise ratio W of the scene image.

[0101] Specifically, the calculation formula for the signal-to-noise ratio of the scene image is:

[0102] ,

[0103] Wherein, W is the signal-to-noise ratio of the scene image, H1 is the power of the scene image signal, and H2 is the power of the noise signal in the scene image.

[0104] Specifically,

[0105] Optionally, a preferred embodiment of the preset signal-to-noise ratio W0 is W0=30dB,

[0106] Specifically, △W=W0-W, and a preset signal-to-noise ratio difference △W0 is provided in the control module. The preferred embodiment of △W0 is △W0=3dB.

[0107] Specifically, the specific process of determining the reduced operating frequency of the frequency modulator is as follows:

[0108] If △W≤△W0, the control module uses the preset fourth operating frequency adjustment coefficient γ4 to perform secondary adjustment on the operating frequency of the frequency modulator;

[0109] If ΔW>ΔW0, the control module uses the preset third operating frequency adjustment coefficient γ3 to perform secondary adjustment on the operating frequency of the frequency modulator.

[0110] Specifically, 0<γ3<γ4<1, the preferred embodiment of the preset third operating frequency adjustment coefficient γ3 is γ3=0.9, and the preferred embodiment of the preset fourth operating frequency adjustment coefficient γ4 is γ4=0.95, wherein the reduced operating frequency of the frequency modulator is recorded as T", and T"=T'×γu is set, wherein γu is the preset uth operating frequency adjustment coefficient, and p=3,4 is set.

[0111] During implementation, the present invention sets a preset signal-to-noise ratio and reduces the operating frequency of the frequency modulator according to the signal-to-noise ratio of the on-site image. If the operating frequency of the frequency modulator is too high, the signal-to-noise ratio of the on-site image will be abnormally increased. The operating frequency of the frequency modulator is reduced to reduce the signal-to-noise ratio of the on-site image, thereby further improving the timing accuracy of the photoelectric timer.

[0112] Embodiment 1, in this embodiment 1, the control processor presets the difference △W between the signal-to-noise ratio W0 and the signal-to-noise ratio W of the scene image when W<M0, and adjusts the increased working frequency T' of the frequency modulator; △M0 is set as the preset signal-to-noise ratio difference, △W=W0-W, the preset third working frequency adjustment coefficient is recorded as γ3, and the preset fourth working frequency adjustment coefficient is recorded as γ4, wherein 0<γ3<γ4<1, γ3=0.9, γ4=0.95, △W0=3dB, W0=30dB, the increased working frequency of the frequency modulator is recorded as T', T'=30Hz, W=25dB in this embodiment 1,

[0113] In the present embodiment 1, ΔW=30dB-25dB=5dB, it is determined that ΔW>ΔW0 and the preset third operating frequency adjustment coefficient is used to adjust the increased operating frequency T' of the frequency modulator to T", and T"=30Hz×0.9=27Hz is calculated.

[0114] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A video timing system for swimming competitions, characterized in that: include: A position identification module, used to identify the position of the swimmer, including an image acquisition unit for acquiring a live image, and a positioning unit connected to the image acquisition unit for analyzing the live image to determine the real-time position of the swimmer; A timing module connected to the position identification module, comprising a timing unit connected to the positioning unit for recording the swimming time of the swimmer and a frequency modulator connected to the timing unit for synchronizing the timing signal of the timing unit with the on-site image signal of the image acquisition unit; a data processing module, which is connected to the position identification module and the timing module respectively, and is used to process the position of the swimmer and the swimming time of the swimmer respectively to output competition characteristic data, including an audit component for checking error data in the competition cleaning data output by the preprocessing process; A control module, which is respectively connected to the position identification module, the data processing module and the timing module, and is used to adjust the resolution of image processing according to the missing amount ratio of competition feature data, or to adjust the audit frequency of competition cleaning data according to the missing amount ratio of competition feature data and the average timing jump amount of the timing unit, wherein the control module obtains the missing amount of competition feature data and the total amount of competition feature data per unit time to calculate the missing amount ratio of competition feature data, and the control module determines that the timing accuracy does not meet the requirements under a first ratio condition, and reduces the resolution of image processing, wherein the first ratio condition is that the missing amount ratio of the competition feature data is greater than a preset second ratio, wherein the competition feature data includes the average swimming speed of each swimmer, the swimming distance of each swimmer, and the competition time of each swimmer, Furthermore, the operating frequency of the frequency modulator is adjusted according to the average timing jump amount of the timing unit and the timing difference amount of the timing module, and the operating frequency of the frequency modulator is adjusted for the second time according to the signal-to-noise ratio of the scene image.

2. The video timing system for swimming competition according to claim 1, characterized in that: The resolution of the reduced image processing is determined by the difference between the missing amount ratio of the competition feature data and the preset second ratio.

3. The video timing system for swimming competition according to claim 2, characterized in that: The control module preliminarily determines that the validity of data processing does not meet the requirements under the second proportion condition, and obtains the incremental amount of the timing value when the jump occurs in the unit time and the number of timing jumps in the unit time to calculate the average timing jump amount of the timing unit. The control module determines that the validity of data processing does not meet the requirements under the first jump variable condition, and increases the audit frequency of the competition cleaning data. Among them, the second proportion is that the proportion of missing amount of the competition feature data is greater than the preset first proportion and less than or equal to the preset second proportion; the first jump quantity condition is that the average timing jump quantity of the timing unit is greater than the preset second jump quantity.

4. The video timing system for swimming competition according to claim 3, characterized in that: The audit frequency of the increased competition cleaning data is determined by the difference between the average timing jump amount of the timing unit and the preset second jump amount.

5. The video timing system for swimming competition according to claim 4, characterized in that: The control module preliminarily determines that the working stability of the photoelectric timer does not meet the requirements under the second jump variable condition, and obtains the swimming time of the swimmer recorded by the timing module and the actual swimming time of the swimmer in the scene image to calculate the timing difference of the timing module. The control module determines for the second time that the working stability of the photoelectric timer does not meet the requirements under the preset difference amount condition, and increases the working frequency of the frequency modulator. The second jump amount condition is that the average timing jump amount of the timing unit is greater than the preset first jump amount and less than or equal to the preset second jump amount; the preset difference amount condition is that the timing difference amount of the timing module is greater than the preset difference amount.

6. The video timing system for swimming competition according to claim 5, characterized in that: The increased operating frequency of the frequency modulator is determined by the difference between the timing difference of the timing module and the preset difference.

7. The video timing system for swimming competition according to claim 6, characterized in that: The control module uses a video analyzer connected to the image acquisition unit to respectively acquire the power of the scene image signal and the power of the noise signal in the scene image under the first condition to calculate the signal-to-noise ratio of the scene image. The control module determines that the effectiveness of image transmission does not meet the requirements under the preset signal-to-noise ratio condition, and reduces the operating frequency of the frequency modulator. The preset signal-to-noise ratio is that the signal-to-noise ratio of the scene image is less than the preset signal-to-noise ratio; and the first condition is to complete the increase of the operating frequency of the frequency modulator.

8. The video timing system for swimming competition according to claim 7, characterized in that: The reduced operating frequency of the frequency modulator is determined by the difference between the preset signal-to-noise ratio and the signal-to-noise ratio of the scene image.

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