CN106377240A - Device and method detecting heartbeat rate - Google Patents
Device and method detecting heartbeat rate Download PDFInfo
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- CN106377240A CN106377240A CN201610755756.6A CN201610755756A CN106377240A CN 106377240 A CN106377240 A CN 106377240A CN 201610755756 A CN201610755756 A CN 201610755756A CN 106377240 A CN106377240 A CN 106377240A
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- 230000008859 change Effects 0.000 claims abstract description 110
- 238000001514 detection method Methods 0.000 claims abstract description 54
- 238000003702 image correction Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 239000003086 colorant Substances 0.000 claims description 46
- 230000009466 transformation Effects 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 20
- 229910052760 oxygen Inorganic materials 0.000 description 20
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- 108010054147 Hemoglobins Proteins 0.000 description 18
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000150786 Athletes Species 0.000 description 1
- 102000010445 Lactoferrin Human genes 0.000 description 1
- 108010063045 Lactoferrin Proteins 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7271—Specific aspects of physiological measurement analysis
- A61B5/7285—Specific aspects of physiological measurement analysis for synchronising or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal
- A61B5/7289—Retrospective gating, i.e. associating measured signals or images with a physiological event after the actual measurement or image acquisition, e.g. by simultaneously recording an additional physiological signal during the measurement or image acquisition
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Abstract
The invention provides a device and method detecting heartbeat rate. The device comprises an image collection unit, an image correction unit, a tone detection unit and a heart rate detection unit, wherein the image collection unit can collect images of a target part of a to-be-detected user at intervals preset to form a first target image; the target part has a monitoring area; the image correction unit can rotate the first target image to a preset target position to form a second target image; the tone detection unit can acquire a third target image corresponding to the monitoring area according to the second target image, and acquire tone of the third target image; and the heart rate detection unit forms a tone change curve according to tones of each third target image, and determines the heart rate of the to-be-detected user based on the tone change curve. Heart rate detection accuracy during the motion can be improved by the use of the technical scheme.
Description
Technical field
The present invention relates to technical field of medical instruments, particularly to a kind of device and method of detection heart rate.
Background technology
Heart rate is the important parameter of heart body, may determine that the various hearts according to heart rate and with reference to other specification
Dirty disease, in addition, according to the change of motor process heart rate, targetedly training plan can be formulated for athlete, with
Improve athletic games results.
At present, when detecting heart rate, need corresponding heart rate detection equipment is fixed on user to be detected, with
The mode of directly contact detects to the heart rate of user to be detected.
It is directed to the method that prior art detects heart rate, due to needing that heart rate detection equipment is fixed on use to be detected
With family, detect heart rate in the way of directly contact, the heart rate situation of change during detection Athletess
When, it is fixed on the heart rate detection equipment with athlete and athletic motion will be brought with inconvenience, athlete is normal for impact
The carrying out of motion, thus lead to the accuracy in motor process, heart rate being detected relatively low.
Content of the invention
Embodiments provide a kind of device and method of detection heart rate, it is possible to increase right in motor process
The accuracy that heart rate is detected.
Embodiments provide a kind of device of detection heart rate, including：Image acquisition units, image calibration original
Unit, colour detector unit and heart rate detection unit；
Described image collecting unit, for every the interval time setting, carrying out figure to the target site of user to be detected
As collection, form first object image, wherein said target site includes monitored area；
Described image corrects unit, for by described first object image rotation to the target location pre-setting, being formed
Second target image；
Described colour detector unit, for according to described second target image, obtaining the corresponding to described monitored area
Three target images, and obtain the colour of described 3rd target image；
Described heart rate detection unit, for the colour according to each described 3rd target image, forms colour change curve,
And the heart rate of described user to be detected is determined according to described colour change curve.
Preferably,
Described image correction unit includes：Identification subelement and rotation subelement；
Described identification subelement, for identifying at least one character shape from described first object image；
Described rotation subelement, for according to described identification subelement identify described at least one character shape and water
Square to relative position, described first object image is rotated, forms described second target image, so that described in each
The image of target site described in second target image and the relative position of horizontal direction are identical.
Preferably,
Described identification subelement, for by Hough transformation identify from described first object image set in advance at least
One described character shape.
Preferably,
Described colour detector unit includes：Locator unit and computation subunit；
Described locator unit, for identifying at least one characteristic point from described second target image, according to described extremely
Monitored area described in few feature point pairs is positioned, and will be located in described monitored area on described second target image
Image is as described 3rd target image；
Described computation subunit, for obtaining each pixel that described 3rd target image includes, according to presetting
Target primary colors, detect the colour of target primary colors described in each described pixel, calculate described in each described pixel
The colour sum of target primary colors, using described colour sum as described 3rd target image colour.
Preferably,
Described target primary colors includes：Green.
Preferably,
Described heart rate detection unit, for the collection according to each first object image corresponding to described 3rd target image
Sequentially, with acquisition time as abscissa, using the colour of the 3rd target image each described as vertical coordinate, simulate described colour
Change curve；And according to included by described colour change curve stationary point number, and first on described colour change curve
The corresponding acquisition time in stationary point and last stationary point, determines the heart rate of described user to be detected by equation below one；
Described formula one includes：
Wherein, described γ is the heart rate of described user to be detected, unit be beat/min；Described m is that described colour becomes
Change the number in stationary point included by curve；Described t1For the corresponding acquisition time in first stationary point on described colour change curve, single
Position is the second；Described t2For the corresponding acquisition time in last stationary point on described colour change curve, unit is the second.
The embodiment of the present invention additionally provides a kind of method of detection heart rate speed, and the method includes：
Every the interval time setting, image acquisition is carried out to the target site of user to be detected, forms first object figure
Picture, wherein said target site includes monitored area；
By described first object image rotation to the target location pre-setting, form the second target image；
According to described second target image, obtain the 3rd target image corresponding to described monitored area, and obtain described
The colour of the 3rd target image；
According to the colour of each described 3rd target image, form colour change curve；
Determine the heart rate of described user to be detected according to described colour change curve.
Preferably,
Described by described first object image rotation to the target location pre-setting, form the second target image and include：
Identify at least one character shape from described first object image, according at least one character shape described and water
Square to relative position, described first object image is rotated, forms described second target image, so that described in each
The image of target site described in second target image and the relative position of horizontal direction are identical.
Preferably,
Described according to described second target image, obtain the 3rd target image corresponding to described monitored area and include：
Identify at least one characteristic point from described second target image, supervise according at least one feature point pairs described
Survey region to be positioned, and using the image being located in described monitored area on described second target image as described 3rd target
Image；
The described colour obtaining described 3rd target image includes：
Obtain each pixel that described 3rd target image includes, according to target primary colors set in advance, detect each
The colour of target primary colors described in individual described pixel, calculates the colour sum of target primary colors described in each described pixel,
Using described colour sum as described 3rd target image colour.
Preferably,
The described colour according to each described 3rd target image, forms colour change curve and includes：
Acquisition order according to each first object image corresponding to described 3rd target image, with acquisition time for horizontal seat
Mark, using the colour of the 3rd target image each described as vertical coordinate, simulates described colour change curve；
Described included according to the heart rate that described colour change curve determines described user to be detected：
First stationary point in the number in stationary point, and described colour change curve according to included by described colour change curve
And the corresponding acquisition time in last stationary point, the heart rate of described user to be detected is determined by equation below one；
Described formula one includes：
Wherein, described γ is the heart rate of described user to be detected, unit be beat/min；Described m is that described colour becomes
Change the number in stationary point included by curve；Described t1For the corresponding acquisition time in first stationary point on described colour change curve, single
Position is the second；Described t2For the corresponding acquisition time in last stationary point on described colour change curve, unit is the second.
The device and method of detection heart rate provided in an embodiment of the present invention, beating with heart, blood red in tissue
The oxygen content of albumen can generating period change, and the cyclically-varying of hemoglobin oxygen content can make the colour of skin institute reflected light
Generating period changes, and then so that the colour generating period of skin image is changed, and according to this principle, image acquisition units are every
Every the interval time setting, the target site of user to be detected is carried out with an image acquisition, form first object image, image
Correction unit forms the second target image to first object correct image；Colour detector unit is known from the second target image
After not going out corresponding 3rd target image in monitored area, obtain the colour of the 3rd target image；Heart rate detection unit is according to each
The colour of the 3rd image forms colour change curve, and determines the heart rate of user to be detected according to colour change curve.
Due to image acquisition units not with user's directly contact to be detected, the motion of user to be detected will not be impacted, so as to
Enough improve the accuracy in motor process, heart rate being detected.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of schematic device of detection heart rate that one embodiment of the invention provides；
Fig. 2 is a kind of method flow diagram of detection heart rate that one embodiment of the invention provides；
Fig. 3 is a kind of method flow diagram of detection heart rate that another embodiment of the present invention provides；
Fig. 4 is a kind of schematic diagram of colour change curve that one embodiment of the invention provides.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments, based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment being obtained on the premise of not making creative work, broadly falls into the scope of protection of the invention.
As shown in figure 1, embodiments providing a kind of device of detection heart rate, including：Image acquisition units
101st, image correction unit 102, colour detector unit 103 and heart rate detection unit 104；
Described image collecting unit 101, for every the interval time setting, carrying out to the target site of user to be detected
Image acquisition, forms first object image, and wherein said target site includes monitored area；
Described image correct unit 102, for by described first object image rotation to the target location pre-setting, shape
Become the second target image；
Described colour detector unit 103, for according to described second target image, obtaining corresponding to described monitored area
3rd target image, and obtain the colour of described 3rd target image；
Described heart rate detection unit 104, for the colour according to each described 3rd target image, forms colour change bent
Line, and the heart rate of described user to be detected is determined according to described colour change curve.
Embodiments provide a kind of device of detection heart rate, beating with heart, blood red egg in tissue
White oxygen content can generating period change, and the cyclically-varying of hemoglobin oxygen content can make the colour of skin institute reflected light send out
Raw cyclically-varying, and then make the colour generating period of skin image change, according to this principle, heart rate detection unit according to
Image acquisition units were once gathered to the target site of user to be detected every the interval time setting, and formed first object
Image, image correction unit forms the second target image to first object correct image；Colour detector unit is from the second mesh
After corresponding 3rd target image in monitored area is identified on logo image, obtain the colour of the 3rd target image；Heart rate detection list
Unit forms colour change curve according to the colour of each the 3rd image, and determines user's to be detected according to colour change curve
Heart rate.Due to image acquisition units not with user's directly contact to be detected, shadow will not be caused to the motion of user to be detected
Ring such that it is able to improve the accuracy in motor process, heart rate being detected.
In an embodiment of the invention, image correction unit includes identification subelement and rotation subelement, and image is adopted
Collection unit often collects a first object image, and identification subelement identifies at least one feature shape in this first object image
Shape, rotation subelement according to the relative position of identification at least one character shape of identifying of subelement and horizontal direction, to this
First object image is rotated, formed the second target subelement so that in each second target image user to be detected mesh
The image at mark position is identical with the relative position of horizontal direction.
Specifically,
Due to image acquisition units, in collection first object image process, user to be detected is it may happen that motion, to be detected
The motion of user leads to the relative position of the image of use target site to be detected and horizontal direction in different first object images not
Same, if directly identifying the monitored area eventually for detection colour from first object image, can lead to from different first mesh
The monitored area identified in logo image is inconsistent；Because the distribution situation of human body different parts skin blood vessel is different, correspondingly
The colour of reflected light also differs, and after being ultimately imaged, corresponding colour is also different；If identified from each first object image
The monitored area going out is inconsistent, it will so that the colour change curve that the colour according to image in monitored area is formed is existed larger
Error, and then lead to the heart rate detecting to there is also larger error.By image correction unit to first object image
It is corrected, form the second target image to carrying out rotation in first object image, make to be detected in each second target image
The relative position all same of the image at ownership goal position and horizontal direction is it is ensured that orient from each second target image
Monitored area both corresponds to the same position on ownership goal position to be detected, and that is, each the 3rd target image is all to be detected
The image of user's same skin, thus the Variable Control of impact colour is this parameter of heart beating it is ensured that the heart that detects
The accuracy of hop rate rate.
For example, using photographic head as image acquisition units, the entirely facial image of user to be detected is gathered by photographic head
As first object image, it is directed to each first object image that photographic head collects, image correction unit is from the first mesh
Two inner eye corners of user to be detected are identified on logo image, the relative position according to two inner eye corners and horizontal direction is to the first mesh
Logo image is rotated, and makes line and the horizontal direction parallel of two inner eye corners, and such as first object image is rotated counterclockwise
10 °, postrotational first object image is exported to colour detector unit as the second target image, so ensure to be transferred to
In each second target image of colour detector unit, the line of two inner eye corners of user to be detected all has horizontal direction to put down
OK.
In an embodiment of the invention, identification subelement is in identification feature shape from first object image, permissible
At least one character shape default in first object image is identified by Hough transformation.Because Hough transformation can be known exactly
Not various geometries, can be recognized accurately the relative position of character shape and horizontal direction, Jin Ertong by Hough transformation
Cross accurate rotation and first object image is rotated it is ensured that ownership goal position to be detected in each second target image
Image is identical with the relative position of horizontal direction.
For example, default character shape is two inner eye corners of user to be detected, identification subelement pass through Hough transformation from
Two inner eye corners of user to be detected are identified on the face of user to be detected.
In an embodiment of the invention, colour detector unit includes locator unit and computation subunit, locator
Unit identifies at least one characteristic point from the second target image, set in advance according at least one feature point pairs identifying
Monitored area is positioned, using the image being located in monitored area on the second target image as the 3rd target image.By knowing
Not at least one characteristic point default monitored area to be positioned it is ensured that can be recognized accurately from the second target image
For detecting the 3rd target image of colour, and ensure that the 3rd target image identifying from different second target images is all right
In the same skin of user to be detected, and then the accuracy of heart rate detecting should be ensured.
For example, the border circular areas presetting an a diameter of 1cm on user's forehead to be detected are monitored area, this prison
The center of circle surveying region is located on the perpendicular bisector of two inner eye corner lines of user to be detected, and the distance away from two inner eye corner lines is
5cm.After image correction unit forms the second target image, locator unit identifies user to be detected on the second target image
Two inner eye corners, the position according to two inner eye corners orients monitored area from the second target image, will be positioned at this monitoring
The second target image in region is as the 3rd target image.
In an embodiment of the invention, after locator unit identifies the 3rd target image from the second target image,
Computation subunit obtains each pixel that the 3rd target image includes, and according to target primary colors set in advance, detects each
The colour of target primary colors in pixel, calculate the 3rd target image included by each pixel in target primary colors colour it
With, using the colour calculating sum as the 3rd target image colour.
Specifically,
Heart is beated each time and is organized fresh blood pump to each, and in fresh blood, the oxygen content of hemoglobin is relatively
Height, the oxygen content of hemoglobin will affect the absorbtivity to each primary colors in incident illumination for the skin, thus affecting in skin reflex light
The amount of each primary colors, the colour ultimately resulting in each primary colors in each pixel on skin image changes；But, selecting
After one primary colors is as target primary colors, when hemoglobin oxygen content changes, mesh corresponding to each of skin image pixel
The colour variable quantity very little of mark primary colors, if carry out matching colour by the colour change of target primary colors corresponding to some pixel
Change curve, it will make matching colour change curve out excessively gentle, and easily affected by accidentalia.Calculate the
The colour sum of the target primary colors corresponding to each pixel included by three target images, can be by corresponding to each pixel
The colour change of target primary colors is added up, by the color of target primary colors corresponding to each pixel included by the 3rd target image
Value sum carrys out matching colour change curve as the colour of the 3rd target image, can make the variation tendency of colour change curve more
Plus substantially, facilitate the later stage to be determined the heart rate of user to be detected it is ensured that detected heart beating according to colour change curve
The accuracy of speed；Meanwhile, matching colour change curve is come with the colour sum of target primary colors corresponding to each pixel, permissible
Avoid leading to some or the colour of target primary colors corresponding to several pixel that ANOMALOUS VARIATIONS occurs due to accidentalia, and check colors
Value changes curve causes the situation of more serious impact to occur it is ensured that colour change curve can correctly reflect the 3rd target image
Colour variation tendency.
In an embodiment of the invention, target primary colors can be the green under RGB color pattern.When containing of hemoglobin
When oxygen amount is higher, hemoglobin substantially increases to the absorbtivity of green glow in incident illumination, and the change of HONGGUANG and blue light absorption amount is relatively
Little, thus using green as target primary colors, when the oxygen content change of hemoglobin, the colour of the 3rd target image will produce relatively
Significantly change, so that the variation tendency of colour change curve is become apparent from, make to determine heart rate according to colour change curve
Shi Gengjia is accurate.
In an embodiment of the invention, heart rate detection unit is after getting the colour of the 3rd target image, according to
The acquisition order of each first object image corresponding to the 3rd target image, with acquisition time as abscissa, with each the 3rd mesh
The colour of logo image is as vertical coordinate, matching colour change curve.After obtaining colour change curve, from colour change curve
Identification stationary point, obtains the number in stationary point included by colour change curve, and first stationary point and last on colour change curve
The corresponding acquisition time in one stationary point, determines the heart rate of user to be detected by equation below one；
Described formula one includes：
Wherein, γ is the heart rate of user to be detected, unit be beat/min；M is stationary point included by colour change curve
Number；t1For the corresponding acquisition time in first stationary point on colour change curve, unit is the second；t2For on colour change curve
The corresponding acquisition time in last stationary point, unit is the second.
Specifically,
Using the time of each first object image acquisition corresponding to the 3rd target image as abscissa, with each the 3rd mesh
The colour of logo image has reacted monitored area inner skin image as vertical coordinate matching colour change curve, colour change curve
The time dependent trend of colour.So that target primary colors is as green as a example, during heart contraction, gradually by fresh blood pump to monitoring
Region, in monitored area, the oxygen content of hemoglobin is stepped up, and monitored area increases to the absorbtivity of green glow, leads to monitoring section
The colour of domain inner skin image reduces, when the oxygen content of hemoglobin in monitored area reaches maximum, monitored area endothelium
The colour of skin image is minimum, and lower stationary point in colour change curve；It is consumed with the oxygen in hemoglobin, blood in monitored area
The oxygen content of Lactoferrin progressively declines, and monitored area is reduced to the absorbtivity of green glow, leads to the color of monitored area inner skin image
Value increases, and when the oxygen content of hemoglobin in detection zone reaches minima, the colour of detection zone inner skin image is maximum,
Upper stationary point in colour change curve；Beating with heart beating, colour change curve is in cyclically-varying, recycles now note point
With upper stationary point, beat week for one of the corresponding heart of difference of two neighboring upper stationary point or the corresponding acquisition time of two neighboring bet point
Phase, the time needed for as one time heart beating.The total number in stationary point is obtained from colour change curve, and first stationary point and
The corresponding acquisition time in stationary point, calculates the heart rate of user to be detected by formula one afterwards.
It should be noted that the device of detection heart rate provided in an embodiment of the present invention has multiple ways of realization, than
Outward appearance is manufactured into the form of similar mirror, is placed in the public places such as hospital, stadium, so that user self-help carries out heart beating speed
The detection of rate.
As shown in Fig. 2 one embodiment of the invention provides a kind of method of detection heart rate, the method can include
Following steps：
Step 201：Every the interval time setting, the target site of user to be detected is carried out with image acquisition, form the
One target image, wherein said target site includes monitored area；
Step 202：By described first object image rotation to the target location pre-setting, form the second target image；
Step 203：According to described second target image, obtain the 3rd target image corresponding to described detection zone, and
Obtain the colour of described 3rd target image；
Step 204：According to the colour of each described 3rd target image, form colour change curve；
Step 205：Determine the heart rate of described user to be detected according to described colour change curve.
Embodiments provide a kind of method of detection heart rate, collection includes ownership goal position to be detected
First object image, obtains the second target image to after first object image rectification, identifies monitoring section from the second target image
Corresponding 3rd target image in domain, the change according to the 3rd target image colour forms colour change curve, is changed according to colour
Curve obtains the heart rate of user to be detected；This method can cause shadow to the colour of skin image according to hemoglobin oxygen content
The principle rung, need not directly and use to be detected detecting heart rate it is only necessary to gather the image at ownership goal position to be detected
Family contacts, thus interfering to the motion of user to be detected when avoiding user direct and to be detected to contact, improves in motion
During accuracy that heart rate is detected.
In an embodiment of the invention, obtain first object image after, identify from described first object image to
A few character shape, according to the relative position of at least one character shape described and horizontal direction, to described first object figure
As being rotated, form described second target image, so that the image of target site described in each described second target image
Identical with the relative position of horizontal direction.
In an embodiment of the invention, obtain the second target image after, identify from described second target image to
A few characteristic point, monitored area according at least one feature point pairs described is positioned, and by described second target figure
As on image in described monitored area as described 3rd target image；
After obtaining the 3rd target image, obtain each pixel of including of described 3rd target image, according to setting in advance
Fixed target primary colors, detects the colour of target primary colors described in each described pixel, calculates institute in each described pixel
State the colour sum of target primary colors, using described colour sum as described 3rd target image colour.
In an embodiment of the invention, after the colour obtaining the 3rd target image, according to each described 3rd target
The acquisition order of first object image corresponding to image, with acquisition time as abscissa, with the 3rd target image each described
Colour, as vertical coordinate, simulates described colour change curve；
After getting setting change curve, the number in stationary point according to included by described colour change curve, and described
The corresponding acquisition time in first stationary point and last stationary point on colour change curve, by equation below one determine described in treat
The heart rate of detection user；
Described formula one includes：
Wherein, described γ is the heart rate of described user to be detected, unit be beat/min；Described m is that described colour becomes
Change the number in stationary point included by curve；Described t1For the corresponding acquisition time in first stationary point on described colour change curve, single
Position is the second；Described t2For the corresponding acquisition time in last stationary point on described colour change curve, unit is the second.
Below to detect athletic heart rate example, in conjunction with the dress of detection heart rate provided in an embodiment of the present invention
Put, the method for detection heart rate provided in an embodiment of the present invention is described in further detail, as shown in figure 3, the method can
To comprise the following steps：
Step 301：Every the interval time setting, an image acquisition, shape are carried out to the target site of user to be detected
Become first object image.
In an embodiment of the invention, preset an interval time, gather one time every an interval time
Require to include the target site of user to be detected in one target image, wherein first object image, include in target site
Monitored area.
For example, the target site presetting user to be detected is athletic face, with one piece of position in forehead region in face
It is set to monitored area；Preset interval time is 0.04s, often passes through photographic head to athletic face shots one through 0.04s
Image, as first object image；Or, shot by photographic head and include the facial video of athlete, often through 0.04s from regarding
Pictures are intercepted as first object image on frequency.
Step 302：First object image is rotated, forms the second target image.
In an embodiment of the invention, it is directed to each the first object image get in step 301, by suddenly
Husband's conversion identifies at least one character shape set in advance, according at least one feature identifying on first object image
Shape and the relative position of horizontal direction, rotate to first object image, by first object image rotation to target location,
Form the second target image so that in each second target image the image of target site and horizontal direction relative position phase
With.
For example, preset athletic two inner eye corners and be characterized shape, the target location of first object image is two
Individual inner eye corner line and the position of horizontal direction parallel；After obtaining the first object image including athlete's face, by suddenly
Husband's conversion identifies athletic two inner eye corners on first object image, according to two inner eye corners of athlete and horizontal direction
Relative position rotates to first object image, makes the line of two inner eye corners of athlete and level side on first object image
To parallel, first object image rotation to target location is formed the second target image.
Step 303：Identify monitored area from the second target image, obtain the 3rd target image.
In an embodiment of the invention, it is directed to each second target image obtain in step 302, from the second mesh
At least one characteristic point set in advance is identified on logo image, by least one feature point pairs prison set in advance identifying
Survey region to be positioned, using the image being located in monitored area on the second target image as the 3rd target image.
For example, the border circular areas presetting an a diameter of 1cm on athlete's forehead are monitored area, this monitoring section
The center of circle in domain is located on the perpendicular bisector of two inner eye corner lines of athlete, and the distance away from two inner eye corner lines is 5cm；And it is pre-
If athletic two inner eye corners are as characteristic point.After athletic two inner eye corners are identified from the second target image, root
Monitored area is oriented from the second target image in position according to two inner eye corners, by the second target in this monitored area
Image is as the 3rd target image.
Step 304：Obtain the colour of the 3rd target image.
In an embodiment of the invention, preset target primary colors, be directed to each get in step 303
Three target images, obtain each pixel that the 3rd target image includes, and according to the target primary colors setting, detect each pixel
The colour of target primary colors in point, after calculating the colour of target primary colors in each pixel included by the 3rd target image, will
As the colour of the 3rd target image after the colour calculating.
For example, presetting target primary colors is green, and the 3rd target image includes 100 pixels, in RGB color mould
Under formula, the G-value of each pixel that detection the 3rd target image includes, calculates 100 that the 3rd target image includes respectively
After the G-value of pixel, using the G-value calculating sum as the 3rd target image colour.
Step 305：According to the colour of each the 3rd target image, matching colour change curve.
In an embodiment of the invention, the colour according to each calculating the 3rd target image, with the 3rd target
The acquisition time of first object image corresponding to image as abscissa, using the colour of the 3rd target image as vertical coordinate matching
Colour change curve.
For example, step 301 acquires 100 first object images altogether, correspondingly obtains 100 in step 304
The colour of three target images, according to the acquisition order of this first object image corresponding to 100 the 3rd target images, during gathering
Between be abscissa, with the colour of 100 the 3rd target images as vertical coordinate, simulate colour change curve as shown in Figure 4.
Step 306：Determine the heart rate of user to be detected according to colour change curve.
In an embodiment of the invention, after getting colour change curve, from colour change curve, identify stationary point,
When obtaining number m in stationary point included by colour change curve, and obtaining on colour change curve the corresponding collection in first stationary point
Between t1And last stationary point corresponding acquisition time t2；According to stationary point number m getting, the corresponding collection in first stationary point
Time t1And last stationary point corresponding acquisition time t2, the heart rate γ of user to be detected is calculated by equation below one,
Wherein formula one is as follows：
Wherein, γ is the heart rate of user to be detected, unit be beat/min；M is stationary point included by colour change curve
Number；t1For the corresponding acquisition time in first stationary point on colour change curve, unit is the second；t2For on colour change curve
The corresponding acquisition time in last stationary point, unit is the second.
For example, number m in stationary point included by colour change curve as shown in Figure 4 is 8, corresponding to wherein first stationary point
The acquisition time t of first object image1For 0.25s, the acquisition time t of first object image corresponding to last stationary point2For
3.75s, above input is substituted into formula one and is calculated this athletic heart rate for 60 beats/min.
The device and method of detection heart rate provided in an embodiment of the present invention, at least has the advantages that：
1st, in the device and method of detection heart rate provided in an embodiment of the present invention, beating with heart, tissue
The oxygen content of interior hemoglobin can generating period change, and the cyclically-varying of hemoglobin oxygen content can make skin institute reflected light
The change of colour generating period, and then so that the colour generating period of skin image is changed, according to this principle, image acquisition
Unit carries out an image acquisition every the interval time setting to the target site of user to be detected, forms first object figure
Picture, image correction unit forms the second target image to first object correct image；Colour detector unit is from the second target
After corresponding 3rd target image in monitored area is identified on image, obtain the colour of the 3rd target image；Heart rate detection unit
Colour according to each the 3rd image forms colour change curve, and determines the heart of user to be detected according to colour change curve
Hop rate rate.Due to image acquisition units not with user's directly contact to be detected, the motion of user to be detected will not be impacted,
So as to improve the accuracy in motor process, heart rate being detected.
2nd, in the device and method of detection heart rate provided in an embodiment of the present invention, image correction unit can be to the
One target image is rotated, by first object image rotation to target location, form the second target image it is ensured that each
In second target image, ownership goal station diagram picture to be detected all has identical relative position with horizontal direction, eliminate due to
User movement to be detected causes ownership goal station diagram picture to be detected and horizontal direction relative position in different first object images
Different situations, thereby may be ensured that the monitored area identified from the second target image both corresponds to the same of user to be detected
One piece of skin, the variable controlling impact the 3rd target image colour it is ensured that the accuracy of the colour change curve simulating, thus
The accuracy of the heart rate detecting can be improved.
3rd, in the device and method of detection heart rate provided in an embodiment of the present invention, first object image is being carried out
Timing, can pass through Hough transformation identification feature shape from first object image, with according to character shape and horizontal direction
Relative position first object image is rotated；The geometry in image can be identified due to Hough transformation exactly,
By Hough transformation come identification feature shape, it is possible to increase the accuracy to first object correct image, thus further
Improve the accuracy in motor process, heart rate being detected.
4th, in the device and method of detection heart rate provided in an embodiment of the present invention, obtaining the 3rd target image
During colour, using the colour sum of target primary colors in each pixel included by the 3rd target image as the 3rd target image
Colour.So the colour of target primary colors in each pixel is carried out the cumulative colour as the 3rd target image, on the one hand
The variation tendency that colour change curve can be made becomes apparent from, to determine heart rate according to colour change curve；The opposing party
Face, can avoid the colour leading to target primary colors in some or several pixel due to accidentalia ANOMALOUS VARIATIONS and check colors
Value changes curve causes the situation of more serious impact to occur.
5th, in the device and method of detection heart rate provided in an embodiment of the present invention, can be former as target using green
Color because in natural light green glow affected by hemoglobin oxygen content the most notable.When hemoglobin oxygen content increases, skin
On image, G-value reduces；When hemoglobin oxygen content reduces, on skin image, G-value increases.Using green as target primary colors, can
So that the variation tendency of colour change curve becomes apparent from, reduce the error producing in colour detection process it is ensured that colour changes
The accuracy of curve.
It should be noted that herein, such as first and second etc relational terms are used merely to an entity
Or operation is made a distinction with another entity or operation, and not necessarily requires or imply exist between these entities or operation
Any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant are intended to non-
The comprising of exclusiveness, so that including a series of process of key elements, method, article or equipment not only include those key elements,
But also include other key elements being not expressly set out, or also include being consolidated by this process, method, article or equipment
Some key elements.In the absence of more restrictions, the key element being limited by sentence " including ", does not arrange
Remove and also there is other same factor in the process including described key element, method, article or equipment.
One of ordinary skill in the art will appreciate that：The all or part of step realizing said method embodiment can be passed through
Completing, aforesaid program can be stored in the storage medium of embodied on computer readable the related hardware of programmed instruction, this program
Upon execution, execute the step including said method embodiment；And aforesaid storage medium includes：ROM, RAM, magnetic disc or light
Disk etc. is various can be with the medium of store program codes.
Last it should be noted that：The foregoing is only presently preferred embodiments of the present invention, be merely to illustrate the skill of the present invention
Art scheme, is not intended to limit protection scope of the present invention.All any modifications made within the spirit and principles in the present invention,
Equivalent, improvement etc., are all contained in protection scope of the present invention.
Claims (10)
1. a kind of device of detection heart rate is it is characterised in that include：Image acquisition units, image correction unit, colour inspection
Survey unit and heart rate detection unit；
Described image collecting unit, for every the interval time setting, carrying out image to the target site of user to be detected and adopting
Collection, forms first object image, and wherein said target site includes monitored area；
Described image corrects unit, for by described first object image rotation to the target location pre-setting, forming second
Target image；
Described colour detector unit, for according to described second target image, obtaining the 3rd mesh corresponding to described monitored area
Logo image, and obtain the colour of described 3rd target image；
Described heart rate detection unit, for the colour according to each described 3rd target image, forms colour change curve, and root
Determine the heart rate of described user to be detected according to described colour change curve.
2. device according to claim 1 it is characterised in that
Described image correction unit includes：Identification subelement and rotation subelement；
Described identification subelement, for identifying at least one character shape from described first object image；
Described rotation subelement, at least one character shape and level side described in being identified according to described identification subelement
To relative position, described first object image is rotated, formed described second target image so that each described second
The image of target site described in target image is identical with the relative position of horizontal direction.
3. device according to claim 2 it is characterised in that
Described identification subelement, for by Hough transformation identify from described first object image set in advance at least one
Described character shape.
4. device according to claim 1 it is characterised in that
Described colour detector unit includes：Locator unit and computation subunit；
Described locator unit, for identifying at least one characteristic point from described second target image, according to described at least one
Monitored area described in individual feature point pairs is positioned, and the image being located in described monitored area on described second target image
As described 3rd target image；
Described computation subunit, for obtaining each pixel that described 3rd target image includes, according to mesh set in advance
Mark primary colors, detects the colour of target primary colors described in each described pixel, calculates target described in each described pixel
The colour sum of primary colors, using described colour sum as described 3rd target image colour.
5. device according to claim 4 it is characterised in that
Described target primary colors includes：Green.
6. device according to claim 1 it is characterised in that
Described heart rate detection unit, suitable for the collection according to each first object image corresponding to described 3rd target image
Sequence, with acquisition time as abscissa, using the colour of the 3rd target image each described as vertical coordinate, simulates described colour and becomes
Change curve；And according to included by described colour change curve stationary point number, and on described colour change curve first stay
Point and the corresponding acquisition time in last stationary point, determine the heart rate of described user to be detected by equation below one；
Described formula one includes：
Wherein, described γ is the heart rate of described user to be detected, unit be beat/min；Described m is that described colour change is bent
The number in stationary point included by line；Described t1For the corresponding acquisition time in first stationary point on described colour change curve, unit is
Second；Described t2For the corresponding acquisition time in last stationary point on described colour change curve, unit is the second.
7. a kind of method of detection heart rate is it is characterised in that include：
Every the interval time setting, image acquisition is carried out to the target site of user to be detected, forms first object image, its
Described in target site include monitored area；
By described first object image rotation to the target location pre-setting, form the second target image；
According to described second target image, obtain the 3rd target image corresponding to described monitored area, and obtain the described 3rd
The colour of target image；
According to the colour of each described 3rd target image, form colour change curve；
Determine the heart rate of described user to be detected according to described colour change curve.
8. method according to claim 7 it is characterised in that
Described by described first object image rotation to the target location pre-setting, form the second target image and include：
Identify at least one character shape from described first object image, according at least one character shape described and level side
To relative position, described first object image is rotated, formed described second target image so that each described second
The image of target site described in target image is identical with the relative position of horizontal direction.
9. method according to claim 7 it is characterised in that
Described according to described second target image, obtain the 3rd target image corresponding to described monitored area and include：
Identify at least one characteristic point from described second target image, monitoring section according at least one feature point pairs described
Domain is positioned, and using the image being located in described monitored area on described second target image as described 3rd target figure
Picture；
The described colour obtaining described 3rd target image includes：
Obtain each pixel that described 3rd target image includes, according to target primary colors set in advance, detect each institute
State the colour of target primary colors described in pixel, calculate the colour sum of target primary colors described in each described pixel, by institute
State colour sum as the colour of described 3rd target image.
10. method according to claim 7 it is characterised in that
The described colour according to each described 3rd target image, forms colour change curve and includes：
Acquisition order according to each first object image corresponding to described 3rd target image, with acquisition time as abscissa,
Using the colour of the 3rd target image each described as vertical coordinate, simulate described colour change curve；
Described included according to the heart rate that described colour change curve determines described user to be detected：
First stationary point and in the number in stationary point, and described colour change curve according to included by described colour change curve
The corresponding acquisition time in stationary point, determines the heart rate of described user to be detected by equation below one afterwards；
Described formula one includes：
Wherein, described γ is the heart rate of described user to be detected, unit be beat/min；Described m is that described colour change is bent
The number in stationary point included by line；Described t1For the corresponding acquisition time in first stationary point on described colour change curve, unit is
Second；Described t2For the corresponding acquisition time in last stationary point on described colour change curve, unit is the second.
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| CN111588946A (en) * | 2020-07-01 | 2020-08-28 | 哈尔滨理工大学 | Intelligent infusion system with heart rate monitoring function |
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