Method and apparatus for determining a start-up phase, terminal and storage medium

Abstract

The application discloses a starting stage determination method and device, a terminal and a storage medium. The method comprises the following steps: acquiring motion data of a target object in a running process, extracting a y-axis angle change characteristic value in the motion data, determining whether a starting stage is entered based on the y-axis angle change characteristic value and a first preset threshold value, judging a state of a wave crest and a wave trough according to a preset wave crest and wave trough model if the starting stage is entered, and ending the starting stage if the wave crest and the wave trough are in a stable state. The y-axis angle change characteristic value in the motion data is extracted, and then the y-axis angle change characteristic value is used to determine whether the starting stage is entered. If the starting stage is entered, the state of the wave crest and the wave trough is used to determine whether the starting stage is ended. The efficiency problem of the image comparison mode is avoided, and the accuracy of starting stage determination is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data processing, in particular to a determination method and device for a starting stage, a terminal and a storage medium. BACKGROUND

[0002] Currently, most of the technologies for human motion measurement and analysis are in the field of time measurement, distance measurement, etc., that is, the results are measured, but the process data of human motion cannot be obtained, so the causes of the motion results cannot be analyzed, and then specific improvement guidance cannot be given. Some solutions for measuring the process of human motion are to analyze the human body movements from images through machine vision technology or multi-module acquisition technology. Machine vision has high requirements for environmental illumination, light conditions, environmental background color, and the color of the clothes of the person being measured. Multi-module acquisition technology requires the installation of acquisition modules at different parts of the human body at the same time.

[0003] For running motion, especially the determination of the starting stage, the existing technology adopts a combination of a treadmill and a camera system, that is, the person being measured exercises on the treadmill, and a video is taken to analyze the running action. Video analysis generally uses a comparison analysis method to compare the running action of the person being measured with a standard action image to give a similarity to measure the difference between the actual action and the standard action, and then determine the start and end of the starting.

[0004] However, when the above method is used, the personal experience of running on the treadmill is different from that of running on the actual road, so the action itself may be different, so the collected images cannot accurately reflect the actual running action of the person being measured. In addition, the video analysis method has a large amount of calculation, and the images of the running action cannot reflect the actual effort, stress, etc., and there is no so-called standard action in the actual situation, and different groups of people have different exercise purposes (such as ordinary people for exercise and athletes for performance), so it is difficult to give a standard object, and such comparison results can only be used as an evaluation of the running motion, but cannot be called analysis. Therefore, using the above method to determine the start and end of the starting stage will affect the accuracy of the determination result. SUMMARY

[0005] The main purpose of the present application is to provide a determination method and device for a starting stage, a terminal and a storage medium to solve the problem of low accuracy in the related art.

[0006] In order to achieve the above purpose, in a first aspect, the present application provides a determination method for a starting stage, comprising:

[0007] obtaining motion data of a target object in a running process, and extracting a y-axis angle change characteristic value in the motion data;

[0008] determine whether to enter a starting stage based on the y-axis angle change characteristic value and a first preset threshold value;

[0009] if the starting stage is entered, determine a state of a wave crest and a wave trough according to a preset wave crest and wave trough model;

[0010] if the wave crest and the wave trough are in a stable state, the starting stage ends.

[0011] In a possible implementation, the determination of whether to enter the starting stage based on the y-axis angle change characteristic value and the first preset threshold value comprises:

[0012] if the y-axis angle change characteristic value reaches the first preset threshold value, determine whether the y-axis angle change characteristic value produces periodic fluctuation;

[0013] if the y-axis angle change characteristic value produces periodic fluctuation and a period corresponding to the periodic fluctuation reaches a second preset threshold value, it is determined that the starting stage is entered.

[0014] In a possible implementation, the determination of whether to enter the starting stage based on the y-axis angle change characteristic value and the first preset threshold value comprises:

[0015] if the y-axis angle change characteristic value reaches the first preset threshold value, determine whether the y-axis angle change characteristic value produces periodic fluctuation;

[0016] if the y-axis angle change characteristic value produces periodic fluctuation and a period corresponding to the periodic fluctuation does not reach the second preset threshold value, it is determined whether a next period of the period produces periodic fluctuation.

[0017] In a possible implementation, the determination of whether to enter the starting stage based on the y-axis angle change characteristic value and the first preset threshold value comprises:

[0018] if the y-axis angle change characteristic value does not reach the first preset threshold value and the y-axis angle change characteristic value does not produce periodic fluctuation, it is determined whether a next period of the period produces periodic fluctuation.

[0019] In a possible implementation, after the determination of the state of the wave crest and the wave trough according to the preset wave crest and wave trough model if the starting stage is entered, the method further comprises:

[0020] if the wave crest and the wave trough are in a non-stable state, determine whether the starting stage ends based on an extreme value growth amount of the wave crest and the wave trough and a third preset threshold value.

[0021] In a possible implementation, the determination of whether the starting stage ends based on the extreme value growth amount of the wave crest and the wave trough and the third preset threshold value comprises:

[0022] If the extreme value growth amount of the wave crest and trough is greater than the third preset threshold, the starting stage ends.

[0023] In a possible implementation, the determining whether the starting stage ends based on the extreme value growth amount of the wave crest and trough and the third preset threshold comprises:

[0024] If the extreme value growth amount of the wave crest and trough is less than or equal to the third preset threshold, a step of determining a state of a next wave crest and trough according to a preset wave crest and trough model is performed.

[0025] In a second aspect, an embodiment of the present application provides a starting stage determination apparatus, comprising:

[0026] a data acquisition module configured to acquire motion data of a target object in a running process and extract a y-axis angle change characteristic value in the motion data;

[0027] a starting stage determination module configured to determine whether to enter a starting stage based on the y-axis angle change characteristic value and a first preset threshold;

[0028] a wave crest determination module configured to, if the starting stage is entered, determine a state of a wave crest and trough according to a preset wave crest and trough model;

[0029] an ending stage determination module configured to, if the wave crest and trough are in a stable state, end the starting stage.

[0030] In a third aspect, an embodiment of the present application provides a terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements steps of any starting stage determination method described above when executing the computer program.

[0031] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, and the computer readable storage medium stores a computer program, and the computer program is executable on a processor to implement steps of any starting stage determination method described above.

[0032] The embodiment of the present application provides a starting stage determination method and device, a terminal and a storage medium, which comprises the following steps: acquiring motion data of a target object in a running process, extracting a y-axis angle change characteristic value in the motion data, determining whether to enter a starting stage based on the y-axis angle change characteristic value and a first preset threshold value, if the starting stage is entered, judging a state of a wave crest and a wave trough according to a preset wave crest and wave trough model, and if the wave crest and the wave trough are in a stable state, the starting stage ends. The y-axis angle change characteristic value in the motion data is extracted, then whether to enter the starting stage is determined based on the y-axis angle change characteristic value, if the starting stage is entered, whether the starting stage ends is judged based on the state of the wave crest and the wave trough, which not only avoids the low efficiency of the image comparison mode, but also improves the accuracy of the starting stage determination. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The illustrative embodiments of the application are described and explained with additional specificity and detail through the use of the accompanying drawings in which:

[0034] Figure 1 is a schematic diagram of a running action in a running stage provided by the embodiment of the present application;

[0035] Figure 2 is an implementation flowchart of a starting stage determination method provided by the embodiment of the present application;

[0036] Figure 3 is a structural schematic diagram of a starting stage determination device provided by the embodiment of the present application;

[0037] Figure 4 is a schematic diagram of a terminal provided by the embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0039] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of these terms herein is to be construed to cover the embodiments of the application whether or not the embodiments are described with the use of these terms.

[0040] It should be understood that, in various embodiments of the present application, the magnitude of the serial number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0041] It should be understood that in the present application, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0042] It should be understood that in the present application, "a plurality of" means two or more. "And / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the front and rear associated objects are in an "or" relationship. "Including A, B and C", "including A, B, C" means that A, B and C are all included, "including A, B or C" means that one of A, B and C is included, and "including A, B and / or C" means that any one or any two or three of A, B and C is included.

[0043] It should be understood that in the present application, "B corresponding to A", "B corresponding to A", "A corresponding to B" or "B corresponding to A" means that B is associated with A, and B can be determined according to A. Determining B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information. The matching of A and B means that the similarity of A and B is greater than or equal to a preset threshold.

[0044] Depending on the context, "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting".

[0045] The technical solutions of the present application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in some embodiments.

[0046] In order to make the purpose, technical scheme and advantages of the present application more clear, specific embodiments will be described below with reference to the drawings.

[0047] In the process of running, the motion technology, human body mechanics and physical mechanics are involved in the motion of a subject whether the subject contacts the ground or completes the action in the air. The motion state of the subject can be analyzed and researched from the X (forward and backward of the running direction of the person), Y (left and right of the person) and Z (up and down of the person) three-axis direction acceleration and angle starting from the contact of the runner with the ground. The acceleration in the forward and backward direction, the acceleration in the left and right direction and the acceleration in the up and down direction are included. The braking force, stability, body performance, body change path and the like generated when the subject lands can be analyzed, and further conclusions can be drawn according to the actual results and trend analysis.

[0048] The present application adopts an acceleration sensor to analyze the running action, and the sensor collects the above-mentioned acceleration and angle. The subject only needs to wear the sensor on the wrist, and thus the acceleration and angle data from the start to the complete stop can be collected, and no other measuring equipment is needed.

[0049] The present application divides the running motion into three stages and six actions. The three stages are specifically the start stage, the running stage and the braking stage (the stage of deceleration to complete stop). The six actions in the running stage are touchdown (landing), buffering, back kicking, back swinging, front swinging and pressing down, as shown in FIG. 1. The six actions constitute a complete step, and the running is the continuous repetition of the six actions. Figure 1

[0050] The present application identifies the above-mentioned three stages according to the collected sensor data, and then further identifies the six actions of each step in the running stage, and further analyzes the type of each action.

[0051] In one embodiment, as shown in FIG. 2, a start stage determination method is provided, which includes the following steps: Figure 2

[0052] Step S201: acquiring motion data of a target in the process of running, and extracting a y-axis angle change characteristic value in the motion data.

[0053] The target can be any living body that can realize the above-mentioned running motion. The running motion can be divided into three stages and six actions. The three stages are specifically the start stage, the running stage and the braking stage (the stage of deceleration to complete stop). The six actions in the running stage are touchdown (landing), buffering, back kicking, back swinging, front swinging and pressing down.

[0054] ​​The motion data refers to data collected by a sensor arranged on the target object during the running motion of the target object, such as start stage data, running stage data, braking stage data (deceleration to complete stop stage), or touch ground (landing) data, buffer data, back kick data, back swing data, front swing data, and down pressure data in six actions in the running stage.

[0055] After the sensor acquires the motion data, the motion data is analyzed to extract data corresponding to the start stage, such as start speed and angle change characteristic value. In the process of judging the start stage, only the y-axis angle change characteristic value is extracted to further judge the start stage.

[0056] Step S202: determining whether to enter the start stage based on the y-axis angle change characteristic value and a first preset threshold.

[0057] For the determination of whether to enter the start stage, the following three methods are mainly used:

[0058] The first case: if the y-axis angle change characteristic value reaches the first preset threshold, it is judged whether the y-axis angle change characteristic value produces periodic fluctuation, and further, if the y-axis angle change characteristic value produces periodic fluctuation and the period corresponding to the periodic fluctuation reaches a second preset threshold, it is determined that the start stage is entered.

[0059] The second case: if the y-axis angle change characteristic value reaches the first preset threshold, it is judged whether the y-axis angle change characteristic value produces periodic fluctuation, and further, if the y-axis angle change characteristic value produces periodic fluctuation and the period corresponding to the periodic fluctuation does not reach the second preset threshold, it is judged whether the next period of the period produces periodic fluctuation.

[0060] The third case: if the y-axis angle change characteristic value does not reach the first preset threshold, the y-axis angle change characteristic value does not produce periodic fluctuation, and it is judged whether the next period of the period produces periodic fluctuation.

[0061] It should be noted that the first preset threshold and the second preset threshold are set according to specific conditions, which are not limited here.

[0062] Step S203: if the start stage is entered, the state of the wave crest and trough is judged according to a preset wave crest and trough model.

[0063] If the start stage is entered, after judging the state of the wave crest and trough according to the preset wave crest and trough model, other judgments need to be made, such as if the wave crest and trough are in a non-stable state, judging whether the start stage is ended based on the extreme value growth of the wave crest and trough and a third preset threshold.

[0064] For the extreme value growth amount of the wave crest and trough and the third preset threshold, it is determined whether the starting stage is ended. If the extreme value growth amount of the wave crest and trough is greater than the third preset threshold, the starting stage is ended.

[0065] Further, for the extreme value growth amount of the wave crest and trough and the third preset threshold, it is determined whether the starting stage is ended. If the extreme value growth amount of the wave crest and trough is less than or equal to the third preset threshold, the step of determining the state of the next wave crest and trough according to the preset wave crest and trough model is performed.

[0066] It should be noted that the third preset threshold is set according to specific conditions, which is not limited here. In addition, the first preset threshold, the second preset threshold and the third preset threshold in the present application can be the same or different.

[0067] Step S204: If the wave crest and trough is in a stable state, the starting stage is ended.

[0068] Specifically, the wave crest and trough can be a fixed value. If the wave crest and trough presents regular changes in the prediction period, that is, the wave crest and trough is in a stable state, it means that the starting stage has been ended.

[0069] The embodiment of the present application provides a determination method of a starting stage, including: acquiring motion data of a target object in a running process, and extracting a y-axis angle change characteristic value in the motion data; then determining whether to enter a starting stage based on the y-axis angle change characteristic value and a first preset threshold; if entering the starting stage, determining a state of a wave crest and trough according to a preset wave crest and trough model; and if the wave crest and trough is in a stable state, the starting stage is ended. The y-axis angle change characteristic value in the motion data is extracted, and then whether to enter the starting stage is determined through the y-axis angle change characteristic value. If entering the starting stage, whether the starting stage is ended is determined through the state of the wave crest and trough. Not only the low efficiency problem of the image comparison mode is avoided, but also the accuracy of the starting stage determination is improved.

[0070] It should be understood that the size of the serial number of each step in the above embodiment does not mean the sequence of execution. The execution sequence of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0071] The following is a device embodiment of the present application. For details not described in detail, reference can be made to the corresponding method embodiments described above.

[0072] Figure 3A structure diagram of a start stage determination device is shown, and only parts related to the embodiments of the present application are shown for the convenience of description. The start stage determination device includes a data acquisition module 31, a start stage determination module 32, a wave peak determination module 33 and an end stage determination module 34, and the details are as follows:

[0073] The data acquisition module 31 is configured to acquire motion data of a target object in a running process, and extract a y-axis angle change characteristic value in the motion data.

[0074] The start stage determination module 32 is configured to determine whether to enter a start stage based on the y-axis angle change characteristic value and a first preset threshold.

[0075] The wave peak determination module 33 is configured to, if the start stage is entered, judge a state of a wave peak and a wave trough according to a preset wave peak and wave trough model.

[0076] The end stage determination module 34 is configured to, if the wave peak and the wave trough are in a stable state, end the start stage.

[0077] In a possible implementation, the start stage determination module 32 is further configured to, if the y-axis angle change characteristic value reaches the first preset threshold, judge whether the y-axis angle change characteristic value produces periodic fluctuation; if the y-axis angle change characteristic value produces periodic fluctuation, and a period corresponding to the periodic fluctuation reaches a second preset threshold, determine to enter the start stage.

[0078] In a possible implementation, the start stage determination module 32 is further configured to, if the y-axis angle change characteristic value reaches the first preset threshold, judge whether the y-axis angle change characteristic value produces periodic fluctuation; if the y-axis angle change characteristic value produces periodic fluctuation, and a period corresponding to the periodic fluctuation does not reach the second preset threshold, judge whether a next period of the period produces periodic fluctuation.

[0079] In a possible implementation, the start stage determination module 32 is further configured to, if the y-axis angle change characteristic value does not reach the first preset threshold, and the y-axis angle change characteristic value does not produce periodic fluctuation, judge whether a next period of the period produces periodic fluctuation.

[0080] In a possible implementation, the wave peak determination module 33 further includes a judgment module, which is configured to, if the wave peak and the wave trough are in a non-stable state, judge whether the start stage ends based on an extreme value growth amount of the wave peak and the wave trough and a third preset threshold.

[0081] In one possible implementation, the judgment module is further configured to end the starting phase if the extreme value growth of the peaks and troughs is greater than the third preset threshold.

[0082] In one possible implementation, the judgment module is further configured to perform a step of judging the state of the next peak and trough according to a preset peak and trough model if the extreme value growth of the peak and trough is less than or equal to the third preset threshold.

[0083] Figure 4 This is a schematic diagram of a terminal provided in an embodiment of the present invention. Figure 4 As shown, the terminal 4 in this embodiment includes: a processor 41, a memory 42, and a computer program 43 stored in the memory 42 and executable on the processor 41. When the processor 41 executes the computer program 43, it implements the steps in the above-described methods for determining the various starting phases, for example... Figure 1 Steps 101 to 104 are shown. Alternatively, when processor 41 executes computer program 43, it implements the functions of each module / unit in the above-described starting phase determination device embodiments, for example... Figure 3 The functions of modules / units 31 to 34 shown.

[0084] The present invention also provides a readable storage medium storing a computer program, which, when executed by a processor, is used to implement the method for determining the starting phase provided in the various embodiments described above.

[0085] The readable storage medium can be a computer storage medium or a communication medium. A communication medium includes any medium that facilitates the transfer of computer programs from one location to another. A computer storage medium can be any available medium accessible to a general-purpose or special-purpose computer. For example, a readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application-Specific Integrated Circuit (ASIC). Alternatively, the ASIC can be located in a user device. Of course, the processor and the readable storage medium can also exist as discrete components in a communication device. The readable storage medium can be a read-only memory (ROM), random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0086] The application further provides a program product including execution instructions stored in a readable storage medium. At least one processor of the device can read the execution instructions from the readable storage medium, and the at least one processor executes the execution instructions to enable the device to implement the determination method of the starting stage provided by various embodiments described above.

[0087] In the embodiments of the above device, it should be understood that the processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor.

[0088] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method of determining a start-up phase, characterized in that The method comprises the following steps: acquiring motion data of a target object during running, and extracting a y-axis angle change characteristic value in the motion data; determining whether to enter a starting stage based on the y-axis angle change characteristic value and a first preset threshold value; if the starting stage is entered, judging a state of a wave crest and a wave trough according to a preset wave crest and wave trough model; if the wave crest and the wave trough are in a stable state, the starting stage ends; wherein, the determination of whether to enter the starting stage based on the y-axis angle change characteristic value and the first preset threshold value comprises: if the y-axis angle change characteristic value reaches the first preset threshold value, judging whether the y-axis angle change characteristic value produces periodic fluctuation; if the y-axis angle change characteristic value produces periodic fluctuation, and a period corresponding to the periodic fluctuation reaches a second preset threshold value, it is determined that the starting stage is entered.

2. The method for determining the starting phase as described in claim 1, characterized in that, The determination of whether to enter the starting stage based on the y-axis angle change characteristic value and the first preset threshold value comprises: if the y-axis angle change characteristic value produces periodic fluctuation, and a period corresponding to the periodic fluctuation does not reach the second preset threshold value, it is determined whether a next period of the period produces periodic fluctuation.

3. The method for determining the starting phase as described in claim 1, characterized in that, The determination of whether to enter the starting stage based on the y-axis angle change characteristic value and the first preset threshold value comprises: if the y-axis angle change characteristic value does not reach the first preset threshold value, and the y-axis angle change characteristic value does not produce periodic fluctuation, it is determined whether a next period of the period produces periodic fluctuation.

4. The method for determining the starting phase as described in claim 1, characterized in that, After the step of judging the state of the wave crest and the wave trough according to the preset wave crest and wave trough model if the starting stage is entered, the method further comprises the following steps: if the wave crest and the wave trough are in a non-stable state, judging whether the starting stage ends based on an extreme value growth amount of the wave crest and the wave trough and a third preset threshold value.

5. The method for determining the starting phase as described in claim 4, characterized in that, The judgment of whether the starting stage ends based on the extreme value growth amount of the wave crest and the wave trough and the third preset threshold value comprises: if the extreme value growth amount of the wave crest and the wave trough is greater than the third preset threshold value, the starting stage ends.

6. The method for determining the starting phase as described in claim 4, characterized in that, The judgment of whether the starting stage ends based on the extreme value growth amount of the wave crest and the wave trough and the third preset threshold value comprises: if the extreme value growth amount of the wave crest and the wave trough is less than or equal to the third preset threshold value, a step of judging a state of a next wave crest and wave trough according to the preset wave crest and wave trough model is performed.

7. A device for determining a start-up phase, characterized in that The method comprises the following steps: a data acquisition module is configured to acquire motion data of a target object during running, and extract a y-axis angle change characteristic value in the motion data; a starting stage determination module is configured to determine whether to enter a starting stage based on the y-axis angle change characteristic value and a first preset threshold value; wherein, the determination of whether to enter the starting stage based on the y-axis angle change characteristic value and the first preset threshold value comprises: if the y-axis angle change characteristic value reaches the first preset threshold value, judging whether the y-axis angle change characteristic value produces periodic fluctuation; if the y-axis angle change characteristic value produces periodic fluctuation, and a period corresponding to the periodic fluctuation reaches a second preset threshold value, it is determined that the starting stage is entered; a wave crest determination module is configured to judge a state of a wave crest and a wave trough according to a preset wave crest and wave trough model if the starting stage is entered. an end phase determination module configured to determine the end of the start phase if the wave crests and troughs are in a steady state.

8. A terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The computer program is executed by the processor to implement the steps of the method for determining the start phase according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 8. The computer program is executed by the processor to implement the steps of the method for determining the start phase according to any one of claims 1 to 6.

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