CN106123819B - A kind of ' s focus of attention measurement method - Google Patents
A kind of ' s focus of attention measurement method Download PDFInfo
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- CN106123819B CN106123819B CN201610503932.7A CN201610503932A CN106123819B CN 106123819 B CN106123819 B CN 106123819B CN 201610503932 A CN201610503932 A CN 201610503932A CN 106123819 B CN106123819 B CN 106123819B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/23—Clustering techniques
- G06F18/232—Non-hierarchical techniques
- G06F18/2321—Non-hierarchical techniques using statistics or function optimisation, e.g. modelling of probability density functions
- G06F18/23213—Non-hierarchical techniques using statistics or function optimisation, e.g. modelling of probability density functions with fixed number of clusters, e.g. K-means clustering
Abstract
The invention discloses a kind of ' s focus of attention measurement methods, are measured in real time the head bias data of test object, and the ' s focus of attention position of test object is estimated according to measurement data；Group's attention measurement error caused by partial test object dispersion attention is eliminated by anomalous discrimination and cluster；This ' s focus of attention measurement method provided by the invention is applied to monitor classroom situation in classroom environment, reliable and intuitive data can be provided to understand student's class state, the monitoring for learning situation for current classroom instruction middle school student has higher value.
Description
Technical field
The invention belongs to field of information processing, more particularly, to a kind of ' s focus of attention measurement method.
Background technology
With the development of science and technology, information intelligence has been widely used for the every field in people's daily life.
In teaching field, ' s focus of attention when student listens to the teacher is the index that manager and teacher pay much attention to.
The measuring system and method for current existing attention of student focus are surveyed by detecting the sight of student
Amount；Including close-in measurement and telemeasurement two ways；The visual line measurement of short distance mostly uses preposition measuring instrument, such as
Tobii etc. can more accurately measure the sight data of short distance student in the state that human body attitude is substantially stationary, from
And it extrapolates student's sight and falls position on the screen to determine ' s focus of attention；But if hypertelorism, due to human body appearance
The influence of the factors such as state, sight DATA REASONING error is larger, and survey calculation is inaccurate.Remote visual line measurement is mostly used
Wear-type measuring instrument, the sight data of the student are directly measured by wear-type measuring instrument, and then are extrapolated student's sight and fallen
Position on teaching screen determines ' s focus of attention.But this mode needs each student to wear wear-type measuring instrument, at
This cost is high, and largely effects on the Teaching Experience and teaching efficiency of student.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of surveys of test object ' s focus of attention
Amount system, its object is to the ' s focus of attention positions of each test object of head bias data acquisition according to test object to go forward side by side
Row correction improves the accuracy that existing ' s focus of attention measures.
To achieve the above object, according to one aspect of the present invention, a kind of ' s focus of attention measurement method is provided, specifically
Include the following steps：
(1) it is acquired by measuring instrument and obtains test object head bias data, including pitch angle αk, deflection angle βk, test pair
As head center point is in the coordinate (x of space coordinatesk, yk, zk), the spacing z of test object and measuring instrument1And measuring instrument with
The spacing d of teaching screen；
Wherein, space coordinates are using measuring instrument point as coordinate origin, with measuring instrument and plane where teaching screen
Parallel expansion plane is Z=0 planes, using measuring instrument horizontal direction as X-direction, using measuring instrument vertical direction as Y direction；
(2) inclination angle of the height and measuring instrument according to test object head center point coordinates, measuring instrument apart from ground
γ, to above-mentioned pitch angle αk, deflection angle βkIt is calibrated；
(3) according to the spacing z of pitch angle α, deflection angle β and test object and measuring instrument after calibration1, measuring instrument with
The spacing d of teaching screen；Obtain the ' s focus of attention coordinate (x, y, z) of test object；
Wherein,
(4) anomalous discrimination and clustering method is used to eliminate test object group's attention region measurement error, focus point is sat
Mark carries out error correction.
Preferably, above-mentioned ' s focus of attention measurement method,
Pitch angle after calibration
Deflection angle after calibration
Wherein, hkRefer to height of the measuring instrument apart from ground, γ refers to measuring instrument in the vertical direction perpendicular to horizontal plane
On inclination angle.
Preferably, above-mentioned ' s focus of attention measurement method, step (3) include following sub-step：
(3.1) anomalous discrimination
Detect the resident duration of the ' s focus of attention of single test object；The focus that resident duration is more than to pre-set threshold value is sentenced
It is set to inactive ' s focus of attention, remaining is determined as active attention power focus；Wherein, predetermined threshold value uses adjustable experience
Threshold value；
(3.2) focus clusters
Inactive ' s focus of attention is abandoned, active attention power focus is clustered using K-Means clustering algorithms, it will
N active attention power focus is divided into k focus cluster；
(3.3) cluster centre for obtaining and each clustering is calculated；Cluster centre coordinate is according to all object coordinates in the cluster
Mean set；
(3.4) using cluster centre as the center of circle, the circle that a radius is r, the attention as test object group are exhaled
Power region；The attention region is the ' s focus of attention region of current time test object group；Wherein, the size etc. of r
In cluster centre and the cluster apart from the farthest focus of cluster centre the distance between.
Above-mentioned error correction further gets the note of test object group according to the ' s focus of attention of test object
Power of anticipating region；Due to the otherness of test object individual, partial test object may be absent minded, so as to cause test pair
As the measurement error in group's attention region can effectively avoid inactive measurement point from bringing using the method for anomalous discrimination
Resultant error；Using K-Means clustering algorithms, after eliminating abnormal focus, the characteristics of using cluster, by discrete multiple tests
Object ' s focus of attention is divided into k cluster, i.e. k group's ' s focus of attention region, makes the attention area results of acquisition more
Accurately.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect：
' s focus of attention measurement method provided by the invention calculates each survey according to the head bias data of test object
Try the focal position of object attention；And caused using anomalous discrimination and clustering processing elimination partial test object dispersion attention
Group's attention measurement error, to obtain region-of-interest of the test object group to screen；This method is applied to religion
When in room environmental, classroom situation is monitored for instructor, student's class state is understood and provides reliable and intuitive data；Effectively keep away
Exempt from the accidental error and measurement error that are generated by individual student ' s focus of attention, improves accuracy of measurement.
Description of the drawings
Fig. 1 is application scenario diagram of the ' s focus of attention measurement method provided in an embodiment of the present invention under classroom environment；
Fig. 2 is the space coordinates schematic diagram in the embodiment of the present invention；
Fig. 3 is that the calibration for the head deflection angle brought to the movement of test object head center in the embodiment of the present invention is illustrated
Figure；
Fig. 4 is the schematic diagram at Kinect measuring instruments inclination angle in the embodiment of the present invention；
Fig. 5 is the head pitch angle of the test object in the embodiment of the present invention and the schematic diagram of deflection angle；
Fig. 6 is the flow diagram of error correction in ' s focus of attention measurement method provided in an embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
Fig. 1 show the application scenario diagram of embodiment；Teaching screen is located in the middle part of the metope of classroom forefront, and teacher station exists
It as currently gives lessons before screen, at teacher's pointer instruction where emphasis and test object currently most answers considerable focus；It is imparting knowledge to students
One Kinect measuring instrument is installed on the ceiling between screen and test object, several test objects can be detected simultaneously
Head deflection data, test object position is before desk；The focus measurement method provided through the invention can know test pair
As whether the current ' s focus of attention of group gives lessons on emphasis currently.This application scenarios with reference to embodiments, are specifically explained
' s focus of attention test method provided by the invention is stated, this method specifically includes following steps：
(1) collecting test object header offset data, including pitch angle αk, deflection angle βk, test object head center point exists
Coordinate (the x of space coordinatesk, yk, zk), the spacing z of test object and measuring instrument1And the spacing of measuring instrument and teaching screen
d；
Wherein, space coordinates are using Kinect measuring instruments point as coordinate origin, with measuring instrument and teaching screen place
The parallel expansion plane of plane is Z=0 planes, using measuring instrument horizontal direction as X-direction, using measuring instrument vertical direction as Y-axis
Direction；
(2) inclination angle of the height and measuring instrument according to test object head center point coordinates, measuring instrument apart from ground
γ, to above-mentioned pitch angle αk, deflection angle βkIt is calibrated；
(3) according to the spacing z of pitch angle α, deflection angle β and test object and measuring instrument after calibration1, measuring instrument with
The spacing d of teaching screen；Obtain the ' s focus of attention coordinate (x, y, z) of test object；
Wherein,
(4) anomalous discrimination and clustering method is used to eliminate test object group's attention region measurement error, focus point is sat
Mark carries out error correction.
It is the space coordinates schematic diagram in embodiment shown in Fig. 2；Using Kinect measuring instruments point as three dimensions
In the coordinate system that coordinate origin is established, coordinate (x of the test object head center point in space coordinatesk, yk, zk), pitch angle
αk, deflection angle βk, test object and measuring instrument spacing z1And the spacing d of measuring instrument and teaching screen is by Kinect measuring instruments
It measures and obtains.
Shown in Fig. 3, the calibration of the head deflection angle to be brought to the movement of test object head center in embodiment is illustrated
Figure；As shown in the drawing, under actual scene, test object ' s focus of attention focuses on the points of the P on X/Y plane, Kinect measuring instruments
Measure obtained head deflection angle [alpha]k,βk；However, practical pitch angle is α as shown in the figure, actual deflection angle is as shown in the figure
β, the measured value of Kinect measuring instruments cannot directly be used as head deflection angle-data, be calibrated.
Fig. 4 is the inclination angle schematic diagram of Kinect measuring instruments in the vertical direction in the embodiment of the present invention；Kinect is measured
The inclination angle of instrument in the vertical direction is γ；Pitch angle and deflection angle are calibrated according to the method provided by the invention,
Pitch angle after calibration
Deflection angle after calibration
It is the head pitch angle and deflection angle schematic diagram of test object in embodiment shown in Fig. 5；Wherein, α is test object
The pitch angle (Pitch) on head, β are the deflection angle (Yaw) on test object head.
It is the flow diagram of error correction in the ' s focus of attention measurement method that embodiment provides shown in Fig. 6, it is specific to wrap
Include following steps：
(3.1) test object individual ' s focus of attention residence time is obtained；
(3.2) inactive focus data is abandoned, active attention power focus data is obtained；In embodiment, it is believed that residence time
Focus of 1 minute more than empirical value is inactive focus；
(3.3) space clustering is carried out to active attention power focus；
In embodiment, using K-Means clustering algorithms, n focus data of acquisition is divided into k cluster, forms k
Focus clusters；In embodiment, k=n/5；
(3.4) cluster centre for obtaining and each clustering is calculated, cluster centre coordinate is by all object coordinates in the cluster
Mean value determines；
(3.5) using cluster centre as the center of circle, the circle of a radius r is exhaled, as the attention region of student group,
The region is region-of-interest of the current time student group to screen of imparting knowledge to students；Wherein, it is poly- to this to be equal to cluster centre for the size of r
Apart from the distance of the farthest focus of cluster centre in class；
(3.6) discrete focus cluster is removed, student group ' s focus of attention region is obtained；In embodiment, institute is eliminated
Including number of focus is less than the cluster item of focus sum 10%.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (2)
1. a kind of ' s focus of attention measurement method, which is characterized in that include the following steps：
(1) it is acquired by measuring instrument and obtains test object head bias data, including pitch angle αk, deflection angle βk, test object head
Coordinate (x of portion's central point in space coordinatesk, yk, zk), the spacing z of test object and measuring instrument1And measuring instrument and teaching
The spacing d of screen；
(2) the height h according to test object head center point coordinates, measuring instrument apart from groundkAnd the inclination angle γ of measuring instrument,
To above-mentioned pitch angle αk, deflection angle βkIt is calibrated；
(3) according to the spacing z of pitch angle α, deflection angle β and test object and measuring instrument after calibration1, measuring instrument and teaching are shielded
The spacing d of curtain；Obtain the ' s focus of attention coordinate (x, y, z) of test object；
Wherein,
The step (3) includes following sub-step：
(3.1) the resident duration of the ' s focus of attention of single test object is detected；Resident duration is more than to the focus of pre-set threshold value
It is determined as inactive ' s focus of attention, remaining is determined as active attention power focus；
(3.2) abandon the inactive ' s focus of attention, for the active attention power focus using K-Means clustering algorithms into
N active attention power focus is divided into k focus cluster by row cluster；
(3.3) cluster centre for obtaining and each clustering is calculated；
(3.4) using the cluster centre as the center of circle, the circle that a radius is r, the attention as test object group are exhaled
Power region；The attention region is the ' s focus of attention region of current time test object group；Wherein, the size etc. of r
In cluster centre and the cluster apart from the farthest focus of cluster centre the distance between；
(4) anomalous discrimination and clustering method is used to eliminate test object group's attention region measurement error, focusing point coordinates into
Row error correction.
2. ' s focus of attention measurement method as described in claim 1, which is characterized in that
Pitch angle after calibration
Deflection angle after calibration
Wherein, γ refers to inclination angle of the measuring instrument on the vertical direction perpendicular to horizontal plane.
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| CN108304779B (en) * | 2017-12-28 | 2021-11-26 | 合肥智权信息科技有限公司 | Intelligent regulation and control method for student education management |
| CN108509923A (en) * | 2018-03-30 | 2018-09-07 | 百度在线网络技术（北京）有限公司 | Classroom attention detection method, device, equipment and computer-readable medium |
| CN110210369B (en) * | 2019-05-28 | 2021-04-06 | 华中科技大学 | Student attention measuring system based on movable seat |
| CN112989865B (en) * | 2019-12-02 | 2023-05-30 | 山东浪潮科学研究院有限公司 | Crowd attention focus judging method based on head gesture judgment |
| CN113133583B (en) * | 2021-04-28 | 2022-06-28 | 重庆电子工程职业学院 | Multifunctional workbench for computer software developer |
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