CN111964674A - Method for judging read-write state by combining acceleration sensor and mobile terminal - Google Patents
Method for judging read-write state by combining acceleration sensor and mobile terminal Download PDFInfo
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Abstract
The invention provides a method for judging a read-write state by combining an acceleration sensor and a mobile terminal, belonging to the technical field of attitude detection, wherein the method comprises the following steps: detecting the gesture by using an acceleration sensor and a gyroscope, and acquiring gesture data of wearing the intelligent watch; judging whether the arm posture wearing the intelligent watch is horizontally placed on a desktop or not according to the triaxial acceleration value obtained by the acceleration sensor and the gyroscope value obtained by the gyroscope; wherein the three-axis acceleration values and the gyroscope values are attitude data; and judging the displacement state of the arm according to a preset acquisition time interval, and judging whether the human body wearing the smart watch enters a read-write state or not according to the displacement state.
Description
Technical Field
The invention belongs to the technical field of attitude detection, and relates to a method for judging a read-write state by combining an acceleration sensor and a mobile terminal.
Background
70-90% of the information obtained by humans is derived from the visual system, and it is statistically more than ninety percent of children who watch poor quality video for long periods of time that leads to premature myopia. The attention on children and teenagers is also concerned about the development of the future society. The importance of the eyesight protection of children and teenagers is urgent in the present day and in the autumn. The myopia problem of teenagers causes high attention of people who know in the whole society. The annual rise of the incidence rate of myopia of students is a worldwide problem, and Asia is the highest incidence rate of myopia. According to statistics: the total number of myopia people in China exceeds 3 hundred million people, which is 1/3 of the total number of myopia people in the world, and the number of myopia people of teenagers is the first in the world. In China, the phenomenon that the myopia rate of students rises year by year is quite obvious, the myopia rate almost increases at the speed of 10% per year, the first, second and third grade of the cities are respectively about 50%, 60% and 70%, the myopia rate of high examinees is over 80% in many places, and the myopia rate of some places is over 90%.
At present, intelligent wrist-watch has appeared gradually in the middle of masses 'study and work life, also gradually expands to teenagers children's study life in the middle of, and at present, many intelligent wrist-watches still do not possess the gesture recognition function to teenagers children, and a small number possesses the intelligent wrist-watch of gesture recognition function, because this function is auxiliary function, the rate of accuracy of its detection often than lower. The invention provides a method for judging a read-write state by combining an acceleration sensor and a mobile terminal, aiming at the problem of low gesture detection accuracy of the existing intelligent watch.
Disclosure of Invention
The invention provides a method for judging a read-write state by combining an acceleration sensor and a mobile terminal, which are used for solving the problem that the accuracy of the existing intelligent watch for detecting the posture of a child wearing the intelligent watch is low, and adopt the following technical scheme:
the invention provides a method for judging a read-write state by combining an acceleration sensor, which comprises the following steps:
detecting the gesture by using an acceleration sensor and a gyroscope, and acquiring gesture data of wearing the intelligent watch;
judging whether the posture of the arm wearing the intelligent watch is close to the horizontal posture and is placed on a desktop according to the triaxial acceleration value obtained by the acceleration sensor and the gyroscope value obtained by the gyroscope; wherein the three-axis acceleration values and the gyroscope values are attitude data;
and judging the displacement state of the arm according to a preset acquisition time interval, and judging whether the human body wearing the smart watch enters a read-write state or not according to the displacement state.
Further, the method further comprises:
after the human body wearing the smart watch is judged to enter a read-write state, the posture of the human body in the read-write process is judged in real time by utilizing the acceleration sensor and the gyroscope, and the posture comprises a sitting type, a countersunk head read-write type, a hand-supporting cheek read-write type and a lying-on desktop sleep type.
Further, the process of determining the sitting posture is as follows:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
detecting that the included angle between the X direction and the horizontal direction of the arm of the human body wearing the intelligent watch is +/-20 degrees, the included angle between the Y direction and the horizontal direction is-10-90 degrees, and meanwhile, judging that the sitting posture is positive if the distance between the arm and the chest of the human body is 30-45 cm.
Further, the process of determining the countersunk head read-write posture is as follows:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
detecting that the included angle between the X direction and the horizontal direction of the arm of a human body wearing the intelligent watch is +/-20 degrees and the included angle between the Y direction and the horizontal direction is-10 degrees-90 degrees, and judging as the countersunk head reading and writing posture when the distance between the arm and the chest of the human body is less than 30cm and more than 10 cm.
Further, the process for judging the read-write posture of the hand-support cheek comprises the following steps:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
detecting that the included angle between the Y direction and the horizontal direction of the arm of a human body wearing the smart watch is +/-20 degrees and the included angle between the X direction and the horizontal direction is 70-100 degrees, and meanwhile, judging that the distance between the arm and the chest of the human body is less than 20cm, and judging that the hand-support cheek reading and writing posture is achieved.
Further, the judgment process of the sleeping type posture of the face-lying desktop is as follows:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
the X direction and the horizontal included angle of the arm of the human body wearing the intelligent watch are detected by the gyroscope to be within a range of +/-20 degrees, the Y direction and the horizontal included angle are within a range of-10 degrees to 90 degrees, and meanwhile, when the distance between the arm and the chest of the human body is less than 10cm, the sleeping posture of the face-lying desktop is judged.
Further, the setting and adaptive adjustment process of the acquisition time comprises:
according to the acquisition time interval, determining acquisition time through an acquisition time model, wherein the acquisition time model is as follows:
wherein the content of the first and second substances,tthe time of acquisition is indicated and indicated,Tis representative of the time interval between the acquisitions,T i is shown asiThe judgment time for the next completion of the judgment of entering the read-write state,nindicating the number of times of completing the judgment of entering the read-write state;T max indicating completionnIn the determination of the secondary entering read-write state, the duration of the single determination isnThe time corresponding to the longest duration in the secondary judgment;T min indicating completionnIn the determination of the secondary entering read-write state, the duration of the single determination isnThe time corresponding to the shortest duration in the secondary judgment; when the acquisition time is set after the read-write state judgment is finished for the first time, namelynWhen =1, defaultT max -T min = 1; lambda represents a time adjustment coefficient, and the value range of lambda is 0.53-0.72;
when the posture of the human body wearing the intelligent watch is judged to be the sitting posture, the acquisition time is adaptively adjusted through the following adaptive time adjustment model:
wherein the content of the first and second substances,t 1representing the acquisition time when the posture of the human body wearing the smart watch is a sitting posture; lambda [ alpha ]1Time adjustment coefficient, lambda, representing a posture of a human body wearing the smart watch as a sit-up posture1The value range of (A) is 0.68-0.83;
when the posture of the human body wearing the intelligent watch is judged to be a countersunk head read-write posture, the acquisition time is adaptively adjusted through the following adaptive time adjustment model:
wherein the content of the first and second substances,t 2representing the acquisition time when the posture of a human body wearing the smart watch is a countersunk head read-write posture; lambda [ alpha ]2Time adjustment coefficient, lambda, representing a countersunk read-write posture of a human body wearing the smart watch2The value range of (A) is 0.42-0.58;
when the posture of the human body wearing the intelligent watch is judged to be a hand-support cheek reading-writing posture, the acquisition time is adaptively adjusted through the following adaptive time adjustment model:
wherein the content of the first and second substances,t 3representing the acquisition time when the posture of a human body wearing the smart watch is a hand-support cheek-read-write posture; lambda [ alpha ]3Time adjustment coefficient, lambda, representing the posture of a human body wearing the smart watch as a hand-held cheek-supported read-write posture3The value range of (A) is 0.42-0.58;
when judging the posture of the human body wearing the intelligent watch and being a lying-on desktop sleeping posture, carrying out self-adaptive adjustment on the acquisition time through a self-adaptive time adjustment model as follows:
wherein the content of the first and second substances,t 4the method comprises the steps of representing acquisition time when the posture of a human body wearing the smart watch is a lying desktop sleeping posture; lambda [ alpha ]4The time adjustment coefficient, lambda, of the lying-down desktop sleeping posture of the human body wearing the smart watch is represented4The value range of (A) is 0.29-0.41.
A mobile terminal for judging a read-write state by combining an acceleration sensor is arranged in an intelligent watch and comprises a core processor, a 2G communication module, a power module, an accessory device, a sensor module and a vibration motor; and each signal end of the core processor is respectively and correspondingly electrically connected with the 2G communication module, the power supply module, the accessory device, the sensor module and the signal end of the vibration motor.
Furthermore, the 2G communication module comprises a communication processor, a loudspeaker, a microphone, a sim card reading device and an antenna module; and the communication processor is respectively and correspondingly electrically connected with the loudspeaker, the microphone, the sim card reading device and each signal terminal of the antenna module.
Further, the sensor module comprises an acceleration sensor, a gyroscope and a distance measuring sensor; and the sensing signal output ends of the acceleration sensor, the gyroscope and the distance measuring sensor are connected with the sensing signal input end of the core processor.
The invention has the beneficial effects that:
according to the method for judging the read-write state by combining the acceleration sensor and the mobile terminal, provided by the invention, the posture state of the intelligent watch wearer is detected by the acceleration sensor, the gyroscope and the distance sensor, so that whether the wearer is in a reading or writing state can be effectively and quickly detected, and the posture detection speed and the detection accuracy are improved. Simultaneously, wear children's head of a family and can also be according to the actual height condition of children's health, through head of a family end input and wear the gesture default when writing that children's health characteristics correspond, improve to different children individuality, the rationality and the accuracy of reading and writing posture correction. The parent terminal is a service terminal which is held by parents and is in data transmission butt joint with the mobile terminal.
On the other hand, the method for judging the read-write state by combining the acceleration sensor and the mobile terminal can perform self-adaptive adjustment of data acquisition time according to the posture of a child, the acquisition frequency of posture data is changed through the self-adaptive adjustment of the acquisition time, the energy consumption of the mobile terminal can be effectively reduced through different acquisition frequencies corresponding to different postures, meanwhile, the energy consumption of the mobile terminal and the timely effectiveness of posture detection can be effectively balanced according to the actual posture of the child, on the premise that the posture judgment of the child with higher timeliness is ensured, the service life of the mobile terminal after single charging is further prolonged, and the condition that the mobile terminal is not powered on under the condition that the child reads and writes for a long time is effectively avoided.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a schematic block diagram of a mobile terminal according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The invention provides a method for judging a read-write state by combining an acceleration sensor and a mobile terminal, which are used for solving the problem of low accuracy of the existing intelligent watch in detecting the posture of a child wearing the watch.
The method for determining the read-write state by combining the acceleration sensor provided by the embodiment of the invention is shown in fig. 1, and comprises the following steps:
s1, detecting the gesture by using the acceleration sensor and the gyroscope, and acquiring gesture data of wearing the smart watch;
s2, judging whether the arm posture wearing the smart watch is close to the horizontal position on the desktop or not according to the triaxial acceleration value obtained by the acceleration sensor and the gyroscope value obtained by the gyroscope; wherein the three-axis acceleration values and the gyroscope values are attitude data;
and S3, judging the displacement state of the arm according to a preset acquisition time interval, and judging whether the human body wearing the smart watch enters a reading-writing state according to the displacement state.
The working principle of the technical scheme is as follows: firstly, detecting the attitude through an acceleration sensor and a gyroscope, and acquiring attitude data of wearing the smart watch; then, judging whether the arm posture wearing the smart watch is approximately horizontally placed on a desktop according to the triaxial acceleration value obtained by the acceleration sensor and the gyroscope value obtained by the gyroscope; wherein the three-axis acceleration values and the gyroscope values are attitude data; and finally, judging the displacement state of the arm according to a preset acquisition time interval, and judging whether the human body wearing the smart watch enters a read-write state or not according to the displacement state.
The effect of the above technical scheme is as follows: whether the posture state of the intelligent watch wearer is detected through the acceleration sensor, the gyroscope and the distance sensor, whether the wearer is in a reading or writing state can be effectively and quickly detected, and the posture detection speed and the detection accuracy are improved. Simultaneously, wear children's head of a family and can also be according to the actual height condition of children's health, combine children's height and the look-up form input of distance when writing with wear the gesture default value when writing that children's health characteristics correspond, improve to different children individuality, the rationality and the accuracy of reading and writing posture correction.
In one embodiment of the present invention, the method further comprises:
s4, after the fact that the human body wearing the smart watch enters a reading and writing state is judged, the posture of the human body in the reading and writing process is judged in real time through the acceleration sensor and the gyroscope, and the posture comprises a sitting type, a countersunk head reading and writing type, a hand-support cheek reading and writing type and a lying-on desktop sleeping type.
Wherein, the judgment process of the sitting posture is as follows:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
and step two, detecting that the included angle between the X direction and the horizontal direction of the arm of the human body wearing the intelligent watch is +/-20 degrees, the included angle between the Y direction and the horizontal direction is-10-90 degrees, and judging that the arm is in the sitting posture when the distance between the arm and the chest of the human body is 30-45 cm.
The process for judging the countersunk head read-write posture is as follows:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
and step two, detecting that the included angle between the X direction and the horizontal direction of the arm of the human body wearing the intelligent watch is +/-20 degrees and the included angle between the Y direction and the horizontal direction is-10-90 degrees, and judging as the countersunk head reading and writing posture when the distance between the arm and the chest of the human body is less than 30cm and more than 10 cm.
The judgment process of the read-write posture of the hand support cheek comprises the following steps:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
and step two, detecting that the included angle between the Y direction and the horizontal direction of the arm of the human body wearing the smart watch is +/-20 degrees and the included angle between the X direction and the horizontal direction is 70-100 degrees by utilizing a gyroscope, and meanwhile, judging that the distance between the arm and the chest of the human body is less than 20cm, and judging that the hand-support cheek reading-writing posture is achieved.
The judgment process of the sleeping type posture of the lying-on desktop is as follows:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
and step two, detecting that the included angle between the X direction and the horizontal direction of the arm of the human body wearing the intelligent watch is +/-20 degrees, the included angle between the Y direction and the horizontal direction is-10 degrees to 90 degrees, and judging that the lying-on desktop sleeping posture is achieved when the distance between the arm and the chest of the human body is less than 10 cm.
The working principle of the technical scheme is as follows: the specific reading and writing postures of the children after entering the reading and writing states are judged by combining preset angle numerical value ranges of the arms in the X direction and the Y direction and preset distance values of the arms from the chest of the human body and posture data detection implemented by the gyroscope. Wherein, the judgement of distance data can be detected and is acquireed through the mode that sets up range finding sensors such as laser range finding sensor in intelligent wrist-watch inside.
The effect of the above technical scheme is as follows: according to the setting of the specific preset value range of each posture, the specific posture of the child after entering the reading and writing states can be judged quickly and accurately, the accuracy and the timeliness of the specific posture detection and identification of the child during writing and reading are further effectively improved, and the error rate of the identification and judgment of the posture of the child is effectively reduced under the conditions that the child moves too much during reading and writing and the posture changes too much and quickly.
In an embodiment of the present invention, the setting and adaptive adjusting process of the acquisition time includes:
the process of setting the acquisition time is as follows:
according to the acquisition time interval, determining acquisition time through an acquisition time model, wherein the acquisition time model is as follows:
wherein the content of the first and second substances,tthe time of acquisition is indicated and indicated,Tis representative of the time interval between the acquisitions,T i is shown asiThe judgment time for the next completion of the judgment of entering the read-write state,nindicating the number of times of completing the judgment of entering the read-write state;T max indicating completionnIn the determination of the secondary entering read-write state, the duration of the single determination isnThe time corresponding to the longest duration in the secondary judgment;T min indicating completionnIn the determination of the secondary entering read-write state, the duration of the single determination isnThe time corresponding to the shortest duration in the secondary judgment; when the acquisition time is set after the read-write state judgment is finished for the first time, namelynWhen =1, defaultT max -T min = 1; lambda represents a time adjustment coefficient, and the value range of lambda is 0.53-0.72;
the self-adaptive adjustment process of the acquisition time comprises the following steps:
step 1, when the posture of a human body wearing the intelligent watch is judged to be a sitting posture, carrying out self-adaptive adjustment on acquisition time through a self-adaptive time adjustment model as follows:
wherein the content of the first and second substances,t 1show to wear intelligent handThe acquisition time when the posture of the human body of the watch is a positive sitting posture; lambda [ alpha ]1Time adjustment coefficient, lambda, representing a posture of a human body wearing the smart watch as a sit-up posture1The value range of (A) is 0.68-0.83;
step 2, when the posture of the human body wearing the intelligent watch is judged to be a countersunk head read-write posture, the acquisition time is adaptively adjusted through the following adaptive time adjustment model:
wherein the content of the first and second substances,t 2representing the acquisition time when the posture of a human body wearing the smart watch is a countersunk head read-write posture; lambda [ alpha ]2Time adjustment coefficient, lambda, representing a countersunk read-write posture of a human body wearing the smart watch2The value range of (A) is 0.42-0.58;
step 3, when the posture of the human body wearing the intelligent watch is judged to be a hand-support cheek reading-writing posture, carrying out self-adaptive adjustment on the acquisition time through the following self-adaptive time adjustment model:
wherein the content of the first and second substances,t 3representing the acquisition time when the posture of a human body wearing the smart watch is a hand-support cheek-read-write posture; lambda [ alpha ]3Time adjustment coefficient, lambda, representing the posture of a human body wearing the smart watch as a hand-held cheek-supported read-write posture3The value range of (A) is 0.42-0.58;
step 4, when the posture of the human body wearing the intelligent watch is judged to be a lying desktop sleeping posture, carrying out self-adaptive adjustment on the acquisition time through a following self-adaptive time adjustment model:
wherein the content of the first and second substances,t 4show the wearing intelligenceThe watch can acquire time when the human body is in a lying desktop sleeping posture; lambda [ alpha ]4The time adjustment coefficient, lambda, of the lying-down desktop sleeping posture of the human body wearing the smart watch is represented4The value range of (A) is 0.29-0.41.
The working principle of the technical scheme is as follows: firstly, the initial acquisition time during specific gesture recognition is acquired by utilizing the preset acquisition time interval for judging whether the child wearing the smart watch enters the reading and writing states. And then, according to the specific posture of the child worn by the intelligent watch, the acquisition time of the posture data of the child is adaptively adjusted by combining with an adaptive adjustment model. Wherein, the abovet 1、t 2、t 3Andt 4the adaptive adjustment formula of (a) determines a value corresponding to the acquisition time of each attitude, thet 1、t 2、t 3Andt 4the time unit of (a) is seconds.
The effect of the above technical scheme is as follows: carry out the self-adaptation adjustment of data acquisition time according to the gesture of wearing children, the acquisition frequency of the self-adaptation adjustment change gesture data through acquisition time, the different acquisition frequency that corresponds through different gestures can effectively reduce mobile terminal's energy resource consumption, and simultaneously, can be according to children's actual gesture, effectively balance mobile terminal energy consumption and the timely validity of gesture detection, it is more to get into to read and write the multi-action and the gesture change after the state to children, the faster problem, under the prerequisite of the gesture judgement that the assurance was higher to wearing children, further improve mobile terminal's single charge after the length of time of use, effectively avoid reading and writing the condition for a long time at children, mobile terminal does not have the electric condition.
The embodiment of the invention provides a mobile terminal for judging a read-write state by combining an acceleration sensor, which is arranged in an intelligent watch and comprises a core processor, a 2G communication module, a power module, an accessory device, a sensor module and a vibration motor, wherein the core processor is connected with the 2G communication module; and each signal end of the core processor is respectively and correspondingly electrically connected with the 2G communication module, the power supply module, the accessory device, the sensor module and the signal end of the vibration motor.
The 2G communication module is used for transmitting the posture of the child to the server group in real time and comprises a communication processor, a loudspeaker, a microphone, a sim card reading device and an antenna module; and the communication processor is respectively and correspondingly electrically connected with the loudspeaker, the microphone, the sim card reading device and each signal terminal of the antenna module. And the mobile terminal performs data transmission with the server side through the 2G communication module by using an MQTT protocol. The service end is a device which is held by parents and is in data transmission butt joint with the mobile terminal, namely the home terminal. The mobile terminal transmits the detected posture data to the server in real time through data transmission, parents can check the read-write state and posture of the child wearing the intelligent watch in real time through the server (namely, the parental terminal), and inputs and sets standard parameters of the posture of the child through the server.
The power supply module comprises a power supply management device, a battery and a USB interface; the power management device is electrically connected with the battery, and the power management device is electrically connected with the USB interface. The power supply control signal input end of the power supply management device is connected with the power supply control signal output end of the core processor; and the power supply control signal input end of the power supply management device is a signal end for electrically connecting the core processor and the power supply module.
The accessory device comprises a key and a display screen; the control signal input end of the key is connected with the control signal output end of the core processor; and the display signal input end of the display screen is connected with the display signal output end of the core processor.
The sensor module comprises an acceleration sensor, a gyroscope and a distance measuring sensor; and the sensing signal output ends of the acceleration sensor, the gyroscope and the distance measuring sensor are connected with the sensing signal input end of the core processor. The mobile terminal can detect the sitting posture, the countersunk head reading and writing posture, the hand support cheek reading and writing posture and the lying desk sleeping posture of the wearing child through a comparison value between the standardized preset posture parameters and the posture parameters of the wearing child monitored by the sensor module in real time.
The mobile terminal also comprises a sensor calibration device; the sensor calibration device comprises a reference sensor module; the reference sensor module is electrically connected with the core processor. The reference sensor module comprises an acceleration reference sensor, a reference gyroscope, a distance measurement reference sensor and a signal conditioning circuit; the acceleration reference sensor, the reference gyroscope and the distance measurement reference sensor are respectively connected with the core processor through signal conditioning circuits.
In the use process of the mobile terminal, the parents of the children can input different gesture preset values through the parental ends according to the self requirements of the children, the gesture of the children is worn through real-time monitoring of the sensor, the operation frequency is high, the detection quantity is large, the problem that the measurement accuracy is reduced due to the error of the sensor is easily caused after the preset value is adjusted, so that the sensor is calibrated through the sensor calibration device when the gesture detection is carried out on the basis of a new preset value. After a new preset value is set, the core controller takes the parameter indexes of the acceleration reference sensor, the reference gyroscope and the ranging reference sensor in the reference sensor module as the standard, and adjusts the parameter indexes of the acceleration sensor, the gyroscope and the ranging sensor through the difference values between the acceleration reference sensor, the reference gyroscope and the ranging reference sensor in the sensor module and the difference values between the acceleration sensor, the gyroscope and the ranging sensor in the sensor module, so that the parameter indexes of the acceleration sensor, the gyroscope and the ranging sensor are always kept as specified standard parameters, and the detection accuracy of the mobile terminal on the posture of the child is further improved.
The working principle of the technical scheme is as follows: gather the posture data of the children who wear intelligent wrist-watch through the sensor module in real time, the core processor is confirmed through posture data and is worn children and whether read and write the state to and get into and read and write concrete reading and writing posture after the state, when the children who wear intelligent wrist-watch with write the posture nonstandard, can influence during eyesight, vibrate the suggestion through shock dynamo.
The effect of the above technical scheme is as follows: the mobile terminal for judging the read-write state by combining the acceleration sensor can effectively and quickly detect whether the wearer is in the reading or writing state or not by detecting the posture state of the wearer of the intelligent watch through the acceleration sensor, the gyroscope and the distance sensor, and the posture detection speed and the detection accuracy are improved. Simultaneously, wear children's head of a family and can also be according to the actual height condition of children's health, through head of a family end input and wear the gesture default when writing that children's health characteristics correspond, improve to different children individuality, the rationality and the accuracy of reading and writing posture correction.
On the other hand, the method for judging the read-write state by combining the acceleration sensor and the mobile terminal can perform self-adaptive adjustment of data acquisition time according to the posture of a child, the acquisition frequency of posture data is changed through the self-adaptive adjustment of the acquisition time, the energy consumption of the mobile terminal can be effectively reduced through different acquisition frequencies corresponding to different postures, meanwhile, the energy consumption of the mobile terminal and the timely effectiveness of posture detection can be effectively balanced according to the actual posture of the child, on the premise that the posture judgment of the child with higher timeliness is ensured, the service life of the mobile terminal after single charging is further prolonged, and the condition that the mobile terminal is not powered on under the condition that the child reads and writes for a long time is effectively avoided.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for judging read-write state by combining an acceleration sensor is characterized by comprising the following steps:
detecting the gesture by using an acceleration sensor and a gyroscope, and acquiring gesture data of wearing the intelligent watch;
judging whether the arm posture wearing the intelligent watch is horizontally placed on a desktop or not according to the triaxial acceleration value obtained by the acceleration sensor and the gyroscope value obtained by the gyroscope; wherein the three-axis acceleration values and the gyroscope values are attitude data;
and judging the displacement state of the arm according to a preset acquisition time interval, and judging whether the human body wearing the smart watch enters a read-write state or not according to the displacement state.
2. The method of claim 1, further comprising:
after the human body wearing the smart watch is judged to enter a read-write state, the posture of the human body in the read-write process is judged in real time by utilizing the acceleration sensor and the gyroscope, and the posture comprises a sitting type, a countersunk head read-write type, a hand-supporting cheek read-write type and a lying-on desktop sleep type.
3. The method of claim 2, wherein the sitting posture is determined by:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
detecting that the included angle between the X direction and the horizontal direction of the arm of the human body wearing the intelligent watch is +/-20 degrees, the included angle between the Y direction and the horizontal direction is-10-90 degrees, and meanwhile, judging that the sitting posture is positive if the distance between the arm and the chest of the human body is 30-45 cm.
4. The method of claim 2, wherein the determining of the countersunk gesture comprises:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
detecting that the included angle between the X direction and the horizontal direction of the arm of a human body wearing the intelligent watch is +/-20 degrees and the included angle between the Y direction and the horizontal direction is-10 degrees-90 degrees, and judging as the countersunk head reading and writing posture when the distance between the arm and the chest of the human body is less than 30cm and more than 10 cm.
5. The method according to claim 2, wherein the hand-support cheek-read-write posture is determined by:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
detecting that the included angle between the Y direction and the horizontal direction of the arm of a human body wearing the smart watch is +/-20 degrees and the included angle between the X direction and the horizontal direction is 70-100 degrees, and meanwhile, judging that the distance between the arm and the chest of the human body is less than 20cm, and judging that the hand-support cheek reading and writing posture is achieved.
6. The method of claim 2, wherein the process of determining the sleeping posture of the face-prone table is as follows:
acquiring attitude data by using a gyroscope five times continuously according to a preset acquisition time interval;
the X direction and the horizontal included angle of the arm of the human body wearing the intelligent watch are detected by the gyroscope to be within a range of +/-20 degrees, the Y direction and the horizontal included angle are within a range of-10 degrees to 90 degrees, and meanwhile, when the distance between the arm and the chest of the human body is less than 10cm, the sleeping posture of the face-lying desktop is judged.
7. The method of claim 3, 4, 5 or 6, wherein the setting of the acquisition time and the adaptive adjustment process comprise:
according to the acquisition time interval, determining acquisition time through an acquisition time model, wherein the acquisition time model is as follows:
wherein the content of the first and second substances,tthe time of acquisition is indicated and indicated,Tis representative of the time interval between the acquisitions,T i is shown asiWhen the judgment for the read/write state judgment is completedThe length of the utility model is long,nindicating the number of times of completing the judgment of entering the read-write state;T max indicating completionnIn the determination of the secondary entering read-write state, the duration of the single determination isnThe time corresponding to the longest duration in the secondary judgment;T min indicating completionnIn the determination of the secondary entering read-write state, the duration of the single determination isnThe time corresponding to the shortest duration in the secondary judgment; when the acquisition time is set after the read-write state judgment is finished for the first time, namelynWhen =1, defaultT max -T min = 1; lambda represents a time adjustment coefficient, and the value range of lambda is 0.53-0.72;
when the posture of the human body is judged to be the sitting posture, the acquisition time is adaptively adjusted through the following adaptive time adjustment model:
wherein the content of the first and second substances,t 1representing the acquisition time when the posture of the human body wearing the smart watch is a sitting posture; lambda [ alpha ]1Time adjustment coefficient, lambda, representing a posture of a human body wearing the smart watch as a sit-up posture1The value range of (A) is 0.68-0.83;
when the posture of the human body is judged to be a countersunk head read-write posture, the acquisition time is adaptively adjusted through the following adaptive time adjustment model:
wherein the content of the first and second substances,t 2representing the acquisition time when the posture of a human body wearing the smart watch is a countersunk head read-write posture; lambda [ alpha ]2Time adjustment coefficient, lambda, representing a countersunk read-write posture of a human body wearing the smart watch2The value range of (A) is 0.42-0.58;
when the posture of the human body is judged to be the hand-support cheek reading-writing posture, the acquisition time is adaptively adjusted through the following adaptive time adjustment model:
wherein the content of the first and second substances,t 3representing the acquisition time when the posture of a human body wearing the smart watch is a hand-support cheek-read-write posture; lambda [ alpha ]3Time adjustment coefficient, lambda, representing the posture of a human body wearing the smart watch as a hand-held cheek-supported read-write posture3The value range of (A) is 0.42-0.58;
when the posture of the human body is judged to be the lying desktop sleeping posture, the acquisition time is adaptively adjusted through the following adaptive time adjustment model:
wherein the content of the first and second substances,t 4the method comprises the steps of representing acquisition time when the posture of a human body wearing the smart watch is a lying desktop sleeping posture; lambda [ alpha ]4The time adjustment coefficient, lambda, of the lying-down desktop sleeping posture of the human body wearing the smart watch is represented4The value range of (A) is 0.29-0.41.
8. A mobile terminal for judging a read-write state by combining an acceleration sensor is characterized in that the mobile terminal is arranged in an intelligent watch and comprises a core processor, a 2G communication module, a power supply module, an accessory device, a sensor module and a vibration motor; each signal end of the core processor is respectively and correspondingly electrically connected with the 2G communication module, the power supply module, the accessory device, the sensor module and the signal end of the vibration motor; the core processor is for executing a program or instructions to implement the method of any one of claims 1-7.
9. The mobile terminal of claim 8, wherein the 2G communication module comprises a communication processor, a speaker, a microphone, a sim card reader, and an antenna module; and the communication processor is respectively and correspondingly electrically connected with the loudspeaker, the microphone, the sim card reading device and each signal terminal of the antenna module.
10. The mobile terminal of claim 8, wherein the sensor module comprises an acceleration sensor, a gyroscope, and a distance measuring sensor; and the sensing signal output ends of the acceleration sensor, the gyroscope and the distance measuring sensor are connected with the sensing signal input end of the core processor.
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