CN113009960A - Time synchronization method for camera image data and pressure treadmill data - Google Patents
Time synchronization method for camera image data and pressure treadmill data Download PDFInfo
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- CN113009960A CN113009960A CN202110151032.1A CN202110151032A CN113009960A CN 113009960 A CN113009960 A CN 113009960A CN 202110151032 A CN202110151032 A CN 202110151032A CN 113009960 A CN113009960 A CN 113009960A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
- G06F1/12—Synchronisation of different clock signals provided by a plurality of clock generators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/27—Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
Abstract
The invention provides a time synchronization method of camera image data and pressure treadmill data, which comprises the following steps: s1, starting the camera and the pressure treadmill; s2, determining the input signal starting time of the camera and the pressure treadmill; s3, a tester performs running test on the running machine, obtains corresponding image data through the camera, and obtains corresponding pressure data through the pressure running machine; and determining a frame corresponding to each frame of the image data in the pressure data according to the sampling frame number per second of the camera and the treadmill so as to acquire the image data and the pressure data at the corresponding frame.
Description
Technical Field
The invention relates to the technical field of measuring plantar pressure, in particular to a time synchronization method of camera image data and pressure treadmill data.
Background
The measurement of the sole pressure plays an important role in designing foot aids, treating some knee joint lesions, adjusting the overall posture of a human body when the human body stands and walks and the like, and the current advanced technology provides time sequence pressure distribution information through sole pressure treadmill test. Meanwhile, the posture of the human body during walking can directly reflect the comprehensive health level of the joints, and the posture is captured by an optical camera. However, since the camera and the pressure treadmill are two independent systems for signal acquisition, the obtained image data and pressure data have independent time series and sampling frequency, respectively. If the 'simultaneous' power supply is simply used as a reference point for time synchronization, the power supply still has a sequential problem, so that the optical image and the pressure information of the camera cannot be synchronized.
Disclosure of Invention
To solve the problems in the background art, the invention provides a time synchronization method of camera image data and pressure treadmill data, comprising the following steps:
s1, starting the camera and the pressure treadmill;
s2, determining the input signal starting time of the camera and the pressure treadmill;
s3, a tester performs running test on the running machine, obtains corresponding image data through the camera, and obtains corresponding pressure data through the pressure running machine; and determining a frame corresponding to each frame of the image data in the pressure data according to the sampling frame number per second of the camera and the treadmill so as to acquire the image data and the pressure data at the corresponding frame.
In some embodiments, step S2 further includes:
knocking the pressure treadmill by a knocking device provided with a mark point, wherein the camera obtains a motion trail diagram of the mark point and simultaneously obtains a pressure signal diagram on the pressure treadmill; and defining the time corresponding to the lowest point of the track on the motion track graph as the starting time of the input signal of the camera, and defining the time corresponding to the maximum value of the pressure on the pressure signal graph as the starting time of the input signal of the pressure treadmill.
In some embodiments, the knocking device comprises a knocking structure and a marking point arranged on one end of the knocking structure, and the marking point is designed to be accurately identified by the camera.
In some embodiments, the mark points adopt a light-emitting structure or a light-reflecting structure or an infrared structure.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
in the time synchronization method of the video data of the camera and the data of the pressure treadmill, the video data and the pressure data acquired by two independent systems of the camera and the pressure treadmill are synchronized on a time sequence and a sampling frequency, so that the time synchronization between the camera and the pressure treadmill is realized, and the restriction of simultaneous power supply is avoided.
Drawings
The above and other features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic view of the knocking device according to the present invention.
Detailed Description
The present invention will be described in more detail below with reference to the accompanying drawings, which illustrate embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of hierarchical regions may be exaggerated for clarity.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
The invention provides a time synchronization method of camera image and pressure treadmill data, the image data and pressure data collected by two independent systems of camera and pressure treadmill realize synchronization on time sequence and sampling frequency, thus realizing time synchronization between camera and pressure treadmill, no longer being restricted by simultaneous power supply; the method can synchronously acquire the walking posture information when the sole pressure is acquired, integrates the mechanical information and the kinematic information, and can better assist in diagnosing and treating some joint diseases.
The time synchronization method of the camera image and the pressure treadmill data comprises the following steps:
the first step,
Starting a camera and the pressure treadmill, wherein the camera is used for shooting the motion form of a tester on the pressure treadmill in real time and generating influence data, and the pressure treadmill also generates pressure data in real time; the camera and the pressure treadmill can be started at the same time or not, and the operation is not limited.
Step two,
The start time of the input signals to the camera and the treadmill is determined.
Specifically, the pressure treadmill is knocked by a knocking device provided with mark points, the camera captures a motion trail diagram of the mark points at the same time, and the pressure treadmill obtains a pressure signal diagram at the same time; the time motion track graph can be a graph with time on the horizontal axis and track height on the vertical axis, and the pressure signal graph can be a graph with time on the horizontal axis and pressure on the vertical axis; the track of the knocking device on the pressure treadmill is usually falling, impacting and rebounding, so that the lowest point of the track in the motion track graph is the time when the knocking device knocks on the pressure treadmill, and the corresponding time is defined as the starting time of an input signal of the camera; the pressure value is the maximum when the rifle bolt device impacts the treadmill when the pressure treadmill is knocked, so that the time corresponding to the maximum pressure value in the pressure signal diagram is defined as the initial time of an input signal of the pressure treadmill;
the starting time of the input signal of the camera and the starting time of the input signal of the pressure treadmill are regarded as the starting time of the operation of the camera and the pressure treadmill, and the synchronization of the starting time of the input signals of the camera and the pressure treadmill is realized.
Referring to fig. 1, in the present embodiment, the knocking device includes a knocking structure and a mark point 3 disposed at one end of the knocking structure, the knocking structure further includes a hammer handle 1 and a hammer head 2 disposed at one end of the hammer handle 1, and the mark point 3 is disposed on the hammer head; when in use, the hammer handle 1 can be held by hand and knocked to a running belt of the pressure running machine through the hammer head 2; the knocking device provided by the embodiment is simple in structure and convenient to operate. Of course, in other embodiments, the specific structural form of the knocking device may be adjusted according to specific situations, and the knocking manner may be manual or automatic, which is not limited herein.
Wherein the marking points 3 are designed to be accurately recognizable by the camera; the specific mark point is of a light emitting structure, a light reflecting structure, an infrared structure, or the like, as long as the track can be recognized by the camera, and the specific mark point is not limited here.
Step three,
The tester runs on the treadmill, the camera obtains corresponding image data in real time, and the pressure treadmill obtains corresponding pressure data in real time.
In the second step, the initial time of the input signal of the camera is used as a first frame sampled by the camera, and the initial point of the input signal of the pressure treadmill is used as a first frame sampled by the pressure treadmill; according to the sampling frequency (namely the number of sampling frames per second) of the camera and the treadmill, a frame corresponding to each frame of the image data is determined in the pressure data so as to obtain the image data and the pressure data at the corresponding frame, namely the pressure data corresponding to each frame of influence data is obtained.
Wherein the sampling frequency of the camera and the sampling frequency of the pressure treadmill are both known and directly provided by the equipment manufacturer.
For further illustration, examples are: for example, the sampling frequency of the camera is 60 frames per second, and the sampling frequency of the pressure treadmill is 1200 frames per second, then from the start time of the input signal, 30 frames of the camera correspond to 0.5s, and the pressure treadmill is 0.5s at 600 frames, i.e. the image data at 30 frames in the camera corresponds to the pressure data at 600 frames in the pressure treadmill.
Furthermore, when the position corresponding to one frame of the image data in the pressure data is between two frames, the average value of the corresponding pressure values at the left and right frames is obtained.
In this embodiment, before performing step three each time, the tapping calibration in step two needs to be performed once after the computer is turned on, and if power failure or other conditions that may affect time synchronization occur during the use process, the tapping calibration in step two needs to be performed again.
It will be appreciated by those skilled in the art that the invention can be embodied in many other specific forms without departing from the spirit or scope thereof. Although embodiments of the present invention have been described, it is to be understood that the present invention should not be limited to those precise embodiments, and that various changes and modifications can be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.
Claims (4)
1. A method for time synchronization of camera image data and pressure treadmill data, comprising:
s1, starting the camera and the pressure treadmill;
s2, determining the input signal starting time of the camera and the pressure treadmill;
s3, a tester performs running test on the running machine, obtains corresponding image data through the camera, and obtains corresponding pressure data through the pressure running machine; and determining a frame corresponding to each frame of the image data in the pressure data according to the sampling frame number per second of the camera and the treadmill so as to acquire the image data and the pressure data at the corresponding frame.
2. The method for time synchronizing camera image data and treadmill data according to claim 1, wherein step S2 further comprises:
knocking the pressure treadmill by a knocking device provided with a mark point, wherein the camera obtains a motion trail diagram of the mark point and simultaneously obtains a pressure signal diagram on the pressure treadmill; and defining the time corresponding to the lowest point of the track on the motion track graph as the starting time of the input signal of the camera, and defining the time corresponding to the maximum value of the pressure on the pressure signal graph as the starting time of the input signal of the pressure treadmill.
3. The method for time synchronizing video camera image data with pressure treadmill data of claim 2, wherein said tapping device comprises a tapping structure and a marker disposed on an end of said tapping structure, said marker configured to be accurately identified by said camera.
4. The method for time synchronizing image data of a camera with data of a treadmill according to claim 3, wherein said mark points are configured to emit light or reflect light or infrared rays.
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| CN102319071A (en) * | 2011-09-20 | 2012-01-18 | 潘启强 | The human body attitude evaluation system |
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| US20150173652A1 (en) * | 2012-07-11 | 2015-06-25 | Zebris Medical Gmbh | Treadmill arrangement and method for operating same |
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| CN109994111A (en) * | 2019-02-26 | 2019-07-09 | 维沃移动通信有限公司 | A kind of exchange method, device and mobile terminal |
| CN111259716A (en) * | 2019-10-17 | 2020-06-09 | 浙江工业大学 | Human body running posture identification and analysis method and device based on computer vision |
| CN111863261A (en) * | 2020-07-18 | 2020-10-30 | 纽智医疗科技(苏州)有限公司 | Method and system for relieving virtual reality disease through adaptive training |
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2021
- 2021-02-03 CN CN202110151032.1A patent/CN113009960B/en active Active
Patent Citations (7)
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| CN102319071A (en) * | 2011-09-20 | 2012-01-18 | 潘启强 | The human body attitude evaluation system |
| US20150173652A1 (en) * | 2012-07-11 | 2015-06-25 | Zebris Medical Gmbh | Treadmill arrangement and method for operating same |
| CN104645552A (en) * | 2013-11-21 | 2015-05-27 | 西安大昱光电科技有限公司 | New synchronous video system based on running machine |
| CN106295505A (en) * | 2016-07-25 | 2017-01-04 | 江苏中路新材料科技发展有限公司 | State estimating system during pavement usage |
| CN109994111A (en) * | 2019-02-26 | 2019-07-09 | 维沃移动通信有限公司 | A kind of exchange method, device and mobile terminal |
| CN111259716A (en) * | 2019-10-17 | 2020-06-09 | 浙江工业大学 | Human body running posture identification and analysis method and device based on computer vision |
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