CN107270932A - Automatic step-recording method for terminal device - Google Patents
Automatic step-recording method for terminal device Download PDFInfo
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- CN107270932A CN107270932A CN201710610834.8A CN201710610834A CN107270932A CN 107270932 A CN107270932 A CN 107270932A CN 201710610834 A CN201710610834 A CN 201710610834A CN 107270932 A CN107270932 A CN 107270932A
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- China
- Prior art keywords
- acceleration magnitude
- step number
- sampled point
- current
- terminal device
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C22/00—Measuring distance traversed on the ground by vehicles, persons, animals or other moving solid bodies, e.g. using odometers, using pedometers
- G01C22/006—Pedometers
Abstract
The invention discloses a kind of automatic step-recording method for terminal device, it includes：The acceleration of terminal device collection is obtained, and extracts the acceleration magnitude with ground generally vertical direction；When the acceleration magnitude of current sampling point, which is met, to impose a condition, judge whether current step number is more than setting step number：When current step number is less than setting step number, current step number is accumulated once, and export current step number；When current step number is more than or equal to setting step number, neighbouring current sampling point setting value length of window is obtained, and calculate the weighted average of setting value length of window；The cumulative acceleration magnitude decrement of set amount sampled point behind the cumulative acceleration magnitude increment and current sampling point of set amount sampled point before current sampling point is calculated, the set amount is equal to 1/2nd weighted averages after rounding；When cumulative acceleration magnitude increment and cumulative acceleration magnitude decrement sum are more than the first predetermined threshold value, then current step number is accumulated once, and export current step number.
Description
Technical field
Field is recorded the present invention relates to sports equipment, and in particular to a kind of automatic step-recording method for terminal device.
Background technology
With the development and the increasingly raising of people's living standard of society, increasingly focus on healthy lifestyles, wherein,
Stroll during leisure, all set walked on foot and in life in travelling can as people as exercise mode it
One.Everyone daily or monthly walked how many step, whether can be obtained as people good exercising way judgment criteria it
One.
In the prior art, the meter step software generally installed using electronic pedometer or smart mobile phone calculates the step of people's walking
Number.Electronic pedometer is mainly made up of acceleration transducer and electronic counter.People's center of gravity in walking can be moved up and down, so that
In the vertical direction can produce acceleration, when the acceleration on vertical direction exceedes presetting threshold value, then it is assumed that people is expert at
Walk, and record a step.But meter step mode of the prior art, it is not accurate enough, it will usually the situation of misdescription record occur, so as to lead
Final meter step result is caused to there is certain error with actual step number of walking.
The content of the invention
For above-mentioned deficiency of the prior art, the invention provides it is a kind of count step accuracy rate it is higher be used for terminal device
Automatic step-recording method.
In order to reach foregoing invention purpose, the technical solution adopted by the present invention is：
There is provided a kind of automatic step-recording method for terminal device, this method it include：
The acceleration of terminal device collection is obtained, and extracts the acceleration magnitude with ground generally vertical direction；
When the acceleration magnitude of current sampling point, which is met, to impose a condition, judge whether current step number is more than setting step number：
When current step number is less than setting step number, current step number is accumulated once, and export current step number；
When current step number is more than or equal to setting step number, neighbouring current sampling point setting value length of window is obtained, and
Calculate the weighted average of setting value length of window；
Calculate and set before current sampling point behind the cumulative acceleration magnitude increment and current sampling point of set amount sampled point
The cumulative acceleration magnitude decrement of quantitative sampled point, the set amount is equal to 1/2nd weighted averages after rounding；
When cumulative acceleration magnitude increment and cumulative acceleration magnitude decrement sum are more than the first predetermined threshold value, then will currently it walk
Number is accumulated once, and exports current step number.
Beneficial effects of the present invention are：This programme is when realizing meter step, first using the acceleration of the vertical direction extracted
Value judges that the center of gravity of personnel, whether in motion, in the case where motion occurs in center of gravity, people is removed by imposing a condition in walking
During acceleration pseudo- peak value, become again by judging whether sampled point meets the change of acceleration in whole walking process afterwards
Gesture, progressively to reject the peak value for being unsatisfactory for walking movement trend.Meter step is judged with traditional center of gravity that only carries out using this method, its
The error rate occurred during meter step is far below conventional method.
Brief description of the drawings
Fig. 1 is the flow chart of automatic step-recording method one embodiment for terminal device.
Part acceleration decomposes the design sketch on X-axis, Y-axis and Z axis when Fig. 2 is walking.
Embodiment
The embodiment to the present invention is described below, in order to which those skilled in the art understand this hair
It is bright, it should be apparent that the invention is not restricted to the scope of embodiment, for those skilled in the art,
As long as various change is in the spirit and scope of the present invention that appended claim is limited and is determined, these changes are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the row of protection.
With reference to Fig. 1, Fig. 1 shows the flow chart of automatic step-recording method one embodiment for terminal device.Such as Fig. 1 institutes
Show, this method 100 includes step 101 to step 106.
When people normally walks, the change for the acceleration meeting generating period that mobile phone is collected, the acceleration of vertical direction (z-axis)
Degree is periodically more obvious, and center of gravity moves up and down when it can embody human motion.Therefore this programme is in a step 101, obtain eventually
The acceleration of end equipment collection, and extract the acceleration magnitude with ground generally vertical direction.
When implementing, when this programme preferably counts step, the Z axis of the acceleration module of the terminal device substantially hangs down with ground
Directly.During meter step, the acceleration that this programme is obtained is 50 samplings of progress in 1s, that is, forms 50 sampled points.
In a step 102, when the acceleration magnitude of current sampling point, which is met, to impose a condition, judge whether current step number is more than
Set step number.
In one embodiment of the invention, it is described to impose a condition as current sampling point acceleration magnitude while meeting following institute
Have ready conditions：
Current sampling point acceleration magnitude is more than a upper sampled point acceleration magnitude, next sampled point acceleration magnitude and second
Time interval between predetermined threshold value, and the sampled point institute at current sampling point and upper meter step moment more than the 3rd predetermined threshold value,
A upper meter using for moment of step a little accumulates once corresponding sampled point for step number.
In step 103, when current step number is less than setting step number, current step number is accumulated once, and export current step
Number, and return to step 101.
At step 104, when current step number is more than or equal to setting step number, neighbouring current sampling point setting value is obtained
Length of window, and the weighted average of setting value length of window is calculated, and perform step 105 and step 106.It is neighbouring currently to adopt
Sampling point is that in terms of time coordinate axle, it is the length of window on the left side time coordinate axle of current sampling point.
Length of window therein is the sampling number between the sampled point of two neighboring meter step, and the sampled point of the meter step is
Current step number sampled point corresponding when accumulating once.
As shown in Fig. 2 in terms of the acceleration magnitude of Z axis, it is assumed that be accumulated once in the 130th current step number of sample point,
It is accumulated once in the 150th current step number of sample point, then the 130th sampled point to adopting between the 150th sampled point
Sampling point number is the length of a window.
In one embodiment of the invention, the specific formula for calculation of the weighted average of setting value length of window is calculated
For：Wherein, αiFor the weights of respective window length, 0 ＜ αi＜ 1,W is weighted average；WiFor neighbour
Sampled point number in i-th of length of window of nearly current sampling point；M is the number of window.
In step 105, calculate current sampling point before set amount sampled point cumulative acceleration magnitude increment and currently
The cumulative acceleration magnitude decrement of set amount sampled point behind sampled point, the set amount is equal to 1/2nd weightings after rounding
Average value.
Specifically, it is assumed that weighted average is 6, the serial number 20 of current sampling point, then set amount before current sampling point
What individual sampled point was referred to is the 17th, 18 and 19 sampled points, behind current sampling point the reference of set amount sampled point be the 21st,
22 and 23 sampled points.When being odd number for weighted average, then set amount is equal to 1/2nd weighted averages after rounding,
Assuming that weighted average is respectively 7,9,11, then 1/2nd weighted averages, which are rounded, is defaulted as 3,4,5.
Wherein, the acceleration magnitude increment of adding up is that latter one sampled point acceleration magnitude subtracts above one in two neighboring sampled point
The accumulated value of the difference of individual sampled point acceleration magnitude.Cumulative acceleration magnitude decrement is an above sampling in two neighboring sampled point
Point acceleration magnitude subtracts the accumulated value of the difference of latter one sampled point acceleration magnitude.
During implementation, the preferably cumulative acceleration magnitude increment E of this programme1With cumulative acceleration magnitude decrement E2Calculation formula difference
For：
Wherein, aiFor ith sample point, ai-1For the i-th -1 sampled point；ai+1For i+1 sampled point；W is flat for weighting
Average, m is the sequence number of current sampling point.
In step 106, when cumulative acceleration magnitude increment and cumulative acceleration magnitude decrement sum are more than the first predetermined threshold value
When, then current step number is accumulated once, and export current step number.
(current sampling point is met in acceleration magnitude for the method provided below using this programme and existing traditional step-recording method
Impose a condition with regard to meter step once) to being walked along direct route and carrying out contrast experiment, experimental result along the step number that U-shaped route is walked
See that Tables 1 and 2 is as follows：
Table 1 along straight line path walk when error rate
| Walking step number | 20 | 100 | 500 | 2000 | 5000 | 10000 | 15000 |
| This method error rate | 0.0289 | 0.0271 | 0.0296 | 0.0321 | 0.0343 | 0.0396 | 0.0387 |
| Conventional method error rate | 0.0344 | 0.0350 | 0.0366 | 0.0372 | 0.0345 | 0.0402 | 0.0396 |
Table 2 along U-shaped route walk when error rate
| Walking step number | 20 | 100 | 500 | 2000 | 5000 | 10000 | 15000 |
| This method error rate | 0.0275 | 0.0322 | 0.0339 | 0.0351 | 0.0373 | 0.0411 | 0.0421 |
| Conventional method error rate | 0.0475 | 0.0411 | 0.0432 | 0.0484 | 0.0493 | 0.0482 | 0.0523 |
Wherein, error rate errRate calculation formula：Wherein, M is the step measured using step-recording method
Number, N is the actual step number walked, for the computing that takes absolute value.From the foregoing, it will be observed that the accuracy rate of the step-recording method of scheme is far above tradition
Method, especially in curve.
Claims (7)
1. the automatic step-recording method for terminal device, it is characterised in that methods described includes：
The acceleration of terminal device collection is obtained, and extracts the acceleration magnitude with ground generally vertical direction；
When the acceleration magnitude of current sampling point, which is met, to impose a condition, judge whether current step number is more than setting step number：
When current step number is less than setting step number, current step number is accumulated once, and export current step number；
When current step number is more than or equal to setting step number, neighbouring current sampling point setting value length of window is obtained, and calculate
The weighted average of setting value length of window；
Set amount behind the cumulative acceleration magnitude increment and current sampling point of set amount sampled point before calculating current sampling point
The cumulative acceleration magnitude decrement of individual sampled point, the set amount is equal to 1/2nd weighted averages after rounding；
When cumulative acceleration magnitude increment and cumulative acceleration magnitude decrement sum are more than the first predetermined threshold value, then current step number is tired out
Plus once, and export current step number.
2. the automatic step-recording method according to claim 1 for terminal device, it is characterised in that it is described impose a condition for
Current sampling point acceleration magnitude is more than a upper sampled point acceleration magnitude, next sampled point acceleration magnitude and the second default threshold
Time interval between value, and current sampling point and the sampled point at upper meter step moment is more than the 3rd predetermined threshold value.
3. the automatic step-recording method according to claim 1 for terminal device, it is characterised in that the length of window is
Sampling number between the sampled point of two neighboring meter step, the sampled point of the meter step is corresponding when being accumulated once for current step number
Sampled point.
4. according to any described automatic step-recording methods for terminal device of claim 1-3, it is characterised in that described cumulative
Acceleration magnitude increment subtracts an above sampled point acceleration magnitude for latter one sampled point acceleration magnitude in two neighboring sampled point
Difference accumulated value.
5. according to any described automatic step-recording methods for terminal device of claim 1-3, it is characterised in that described cumulative
Acceleration magnitude decrement is above a sampled point acceleration magnitude subtracts latter one sampled point acceleration magnitude in two neighboring sampled point
Difference accumulated value.
6. according to any described automatic step-recording methods for terminal device of claim 1-3, it is characterised in that calculate setting
The specific formula for calculation of the weighted average of value length of window is：
<mrow>
<mi>w</mi>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>m</mi>
</munderover>
<msub>
<mi>&alpha;</mi>
<mi>i</mi>
</msub>
<msub>
<mi>W</mi>
<mi>i</mi>
</msub>
</mrow>
Wherein, αiFor the weights of respective window length, 0 ＜ αi＜ 1,W is weighted average；WiFor neighbouring present sample
Sampled point number in i-th of length of window of point；M is the number of window.
7. the automatic step-recording method according to claim 1 for terminal device, it is characterised in that during meter step, the end
The Z axis of the acceleration module of end equipment is substantially vertical with ground.
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Cited By (1)
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| CN108197082A (en) * | 2017-12-05 | 2018-06-22 | 东南大学 | A kind of step-recording method according to paces Reliability estimation |
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