CN113576406A - Non-contact skin oil distribution measuring system and method - Google Patents
Non-contact skin oil distribution measuring system and method Download PDFInfo
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- CN113576406A CN113576406A CN202110802146.8A CN202110802146A CN113576406A CN 113576406 A CN113576406 A CN 113576406A CN 202110802146 A CN202110802146 A CN 202110802146A CN 113576406 A CN113576406 A CN 113576406A
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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
- A61B5/44—Detecting, measuring or recording for evaluating the integumentary system, e.g. skin, hair or nails
- A61B5/441—Skin evaluation, e.g. for skin disorder diagnosis
- A61B5/443—Evaluating skin constituents, e.g. elastin, melanin, water
Abstract
A non-contact skin oil distribution measuring system and method includes a light source system and an imaging system, wherein the light source system is configured to emit measuring light with multiple wavelengths to skin, the measuring light with the multiple wavelengths includes oil component measuring light and at least one non-oil component measuring light, the wavelength of the oil component measuring light corresponds to the wavelength of the absorption light of the oil component on the surface of the skin, the wavelength of the at least one non-oil component measuring light corresponds to the wavelength of the absorption light of the at least one non-oil component of the skin, and the imaging system collects images of the measuring light reflected by the skin so as to determine the content and the distribution of the oil component on the surface of the skin according to the light intensity and distribution information of the oil component measuring light and the non-oil component measuring light in the images. The method can accurately measure the content and distribution of the oil components on the skin surface, and effectively reduce the interference of the absorption of skin tissues on the measuring light on the measuring result.
Description
Technical Field
The invention relates to the field of biomedicine and optics, in particular to a non-contact skin oil distribution measuring system and a non-contact skin oil distribution measuring method.
Background
Skin greasing is a very common item in cosmetology and personal care. Depending on the amount of skin oil, there are different oil removal regimens. Therefore, measuring the amount of oil in the skin is the first step in performing maintenance.
There are three main techniques for measuring skin oil. First, based on the traditional method of oil absorption paper measurement. The main problems with this approach are the following: 1. and (4) contacting. The oil absorption paper must be used to absorb the grease in the area to be measured. 2. The distribution of fat over the entire area (e.g., the face) cannot be measured. The oil absorption paper measures the average oil content of an entire area. Multiple measurements also only measure the average grease generating rate over the entire area. 3. The oil absorbing paper needs to be fixed on a corresponding optical measuring instrument, and an additional measuring step is added. Second, skin oil content is measured by measuring the equivalent resistance or equivalent capacitance or crystal frequency change of the skin. The main problems with this approach are the same as 1 and 2 in the first approach: contact and inability to measure distribution. Thirdly, the measurement is carried out by an optical non-contact method. The measurement method disclosed in patent document CN211534377U includes a background light source and a detection light source, wherein the detection light source emits 960nm light which is absorbed by oil, however, it is difficult to accurately measure the content of skin oil by this method because in practical cases, skin contains many other living tissue components such as water, fat, melanin, etc. besides oil, and these other substances have certain absorption and scattering effects on 960nm besides oil, so that the content and distribution of oil cannot be accurately measured by measuring 960nm light alone.
It is to be noted that the information disclosed in the above background section is only for understanding the background of the present application and thus may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
The main objective of the present invention is to overcome the above-mentioned drawbacks of the background art, and to provide a system and a method for non-contact measurement of skin oil distribution.
In order to achieve the purpose, the invention adopts the following technical scheme:
a non-contact skin oil distribution measurement system comprises a light source system and an imaging system, wherein the light source system is configured to emit measurement light with multiple wavelengths to skin, the measurement light with multiple wavelengths comprises oil component measurement light and at least one non-oil component measurement light, the wavelength of the oil component measurement light corresponds to the wavelength of absorption light of oil components on the surface of the skin, the wavelength of the at least one non-oil component measurement light corresponds to the wavelength of absorption light of at least one non-oil component of the skin, and the imaging system collects an image of the measurement light reflected by the skin so as to determine the content and distribution of the oil components on the surface of the skin according to the light intensity and distribution information of the oil component measurement light and the non-oil component measurement light in the image.
Further:
the at least one non-oily ingredient includes at least one of water, bilirubin, oxygenated hemoglobin, non-oxygenated hemoglobin, oxygenated myoglobin, non-oxygenated myoglobin, and melanin.
The wavelength range of the measuring light with the plurality of wavelengths is 600nm to 5000 nm.
The light source system adopts a laser with adjustable wavelength to generate measuring light with various wavelengths; or the light source system is a wide-spectrum light source with multiple wavelengths, and measuring light with multiple wavelengths is generated by switching different narrow-band filters on the light source system; or the light source system is a wide-spectrum light source with multiple wavelengths, and measurement light images with multiple wavelengths are acquired by switching different narrow-band filters in the imaging system.
The skin deep layer tissue measurement device further comprises a first polaroid arranged on the light source system side and a second polaroid arranged on the imaging system side, the first polaroid and the second polaroid are polaroids with the same polarization direction, measurement light emitted by the light source system passes through the first polaroid to generate polarization measurement light to irradiate the skin, and at least part of reflection light passing through the deep layer tissue of the skin is filtered by the second polaroid before the light reflected by the skin enters the imaging system.
The polarization direction is a linear polarization, a circular polarization or an elliptical polarization direction.
The calibration mask is uniform in thickness, has a known absorption spectrum and is used for calibrating the intensity of a detection signal before measuring the grease on the surface of the skin; wherein, the influence factor of the detection signal strength P is expressed as:
P＝Plight source×fIncident light×fObject to be measured×fEmitting×PDetectorIn which P isLight sourceRepresenting the intensity of the incident light source, fIncident lightRepresenting the influence of the spatial geometrical relationship of the incident ray, fSubstance to be measuredIndicating the influence of the substance to be measured on the light intensity itself, fEmittingRepresenting the influence of the geometrical relationship of the ray exit space, PDetectorRepresenting the response of the detector, by f being knownObject to be measuredAnd corresponding measured P, thereby eliminating the effects of other factors, including PLight source，fIncident light，fEmittingAnd P isDetector。
The calibration mask has the function of absorbing grease.
Before measurement, the measurement system performs spatial position calibration on the characteristics of the measured part of the human body by an image recognition technology.
A non-contact skin oil distribution measuring method is used for measuring the content and distribution of oil components on the surface of skin by using the non-contact skin oil distribution measuring system.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a non-contact skin oil distribution measuring system, wherein a light source system emits measuring light with various wavelengths to skin, the measuring light comprises oil component measuring light and at least one non-oil component measuring light, the wavelength of the oil component measuring light corresponds to the wavelength of the absorbed light of the oil component on the skin surface, and the wavelength of the non-oil component measuring light corresponds to the absorption light wavelength of the non-oil component of the skin tissue (such as water, bilirubin, hemoglobin, myoglobin, melanin and other biological living tissue components), collecting the measuring light image reflected by the skin, according to the light intensity and distribution information of the oil component measuring light and the non-oil component measuring light in the image, the content and the distribution of the oil component on the surface of the skin can be measured more accurately, and the interference of the absorption effect of skin tissues on the measuring light on the measuring result is effectively reduced. The method can provide accurate basis for accurately removing skin oil in medical cosmetology, can also be used for monitoring the oil removal effect, and can also be used for measuring the oil distribution of other parts. The invention has good application prospect in the fields of medical cosmetology, intelligent wearable equipment and the like.
Drawings
Fig. 1 is a schematic structural diagram of a non-contact skin oil distribution measurement system according to an embodiment of the present invention.
FIG. 2 is a graph of multi-wavelength absorption coefficients of skin oils and various skin tissue substances in accordance with an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a non-contact skin oil distribution measurement system according to another embodiment of the invention.
Detailed Description
The embodiments of the present invention will be described in detail below. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for either a fixed or coupled or communicating function.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, an embodiment of the present invention provides a non-contact skin oil distribution measurement system, including a light source system and an imaging system, the light source system being configured to emit measurement light of multiple wavelengths to skin, the measurement light of the multiple wavelengths including an oil component measurement light and at least one non-oil component measurement light, wherein the oil component measurement light has a wavelength corresponding to an absorption light wavelength of an oil component on a skin surface, and the at least one non-oil component measurement light has a wavelength corresponding to an absorption light wavelength of at least one non-oil component of the skin, and the imaging system collects an image of the measurement light reflected by the skin so as to determine a content and a distribution of the oil component on the skin surface according to light intensity and distribution information of the oil component measurement light and the non-oil component measurement light in the image. The plurality of wavelengths may be in the range of ultraviolet to infrared. The skin to be measured may be facial skin or skin of other parts of the human body.
In some embodiments, the at least one non-oily component comprises at least one of water, bilirubin, oxygenated hemoglobin, non-oxygenated hemoglobin, oxygenated myoglobin, non-oxygenated myoglobin, and melanin. Referring to fig. 2, the skin tissue contains a plurality of pigment components, and the pigment components have different absorption coefficients for different wavelengths of light. Fat is a main component constituting oil and fat, and is also a main object to be measured. As can be seen from FIG. 2, the 7 non-greasy components mentioned above are the main light-absorbing components of skin tissue in the wavelength range of 600nm to 1000 nm. In a preferred embodiment, the measurement is performed with 8 different wavelengths of light to separate the 7 skin tissues from the grease. By utilizing the high spatial resolution of optical imaging, the content of the grease can be measured, and the distribution condition of the grease can be measured.
The following is a specific example illustrating the manner in which the invention uses multi-spectraThe accuracy of the measurement is improved. Assume that there are three absorbing substances in the skin, water, oil, and melanin, respectively. At wavelength 1, the detector receives a light intensity signal P1：
P1＝A1×(CWater (W)εWater 1+COil and fatεOil and fat 1+CMelanin pigmentεMelanin 1)
Wherein A is1Is a constant that is both wavelength and system dependent. CWater (W)Is the concentration of water,. epsilonWater 1Is the molar absorption coefficient of water at wavelength 1, is a system-independent but wavelength-dependent constant, COil and fatIs the concentration of the oil,. epsilonOil and fat 1Is the molar absorption coefficient of the oil at a wavelength of 1, CMelanin pigmentIs the concentration of melanin,. epsilonMelanin 1Is the molar absorption coefficient of melanin at wavelength 1. Wherein a1 can be obtained by taking certain empirical values or by calibration with a calibration mask as later used. From the above equation, it can be seen that if we only measure at wavelength 1, then only the total absorption of the skin to be measured, i.e., C, can be measuredWater (W)εWater 1+COil and fatεOil and fat 1+CMelanin pigmentεMelanin 1And the content of the oil and fat cannot be calculated. If we add measurements at wavelength 2 and wavelength 3:
P2＝A2×(Cwater (W)εWater 2+COil and fatεOil and fat 2+CMelanin pigmentεMelanin 2)
P3＝A3×(CWater (W)εWater 3+COil and fatεOil and fat 3+CMelanin pigmentεMelanin 3)
P is the same as at wavelength 12And P3Is the intensity of light, A, measured at wavelengths 2 and 32And A3Is a system constant that can be calibrated or empirically set, and ε is a constant molar absorption coefficient for each species at wavelengths 2 and 3. C is the concentration of different substances to be measured and calculated, and is constant under different systems and different wavelengths. By solvingThe above equations can not only accurately measure the content of the oil, but also obtain the content of other substances, such as water and melanin. The specific expression is as follows:
similarly, if there are many different absorbing components in the skin, more wavelengths are needed to make the measurement, and thus the measurement results for oil and other constituent components at the same time. On the contrary, if only the grease absorbs, the grease content can be measured by light with one wavelength.
In other embodiments, a lesser amount of skin tissue constituents may be ignored, and measurements are made using only a lesser amount of wavelengths of light, thereby reducing costs.
In some embodiments, the light source system employs a wavelength tunable laser to generate measurement light of multiple wavelengths; or the light source system is a wide-spectrum light source with multiple wavelengths, and measuring light with multiple wavelengths is generated by switching different narrow-band filters on the light source system; the light source system is a wide-spectrum light source with multiple wavelengths, and measurement images with multiple wavelengths are acquired by switching different narrow-band filters in the imaging system.
In the first case, the light source system uses a laser with adjustable wavelength, such as an OPO laser or a dye laser, and the corresponding imaging system can be an imaging system including a camera; in the second case, the light source system is a broad-spectrum light source, a narrow-band filter is added in the light source system to obtain light with a specific wavelength, and light with a plurality of wavelengths can be obtained by automatically or manually switching a plurality of narrow-band filters. In the third case, the light source system is a broad-spectrum light source, a narrow-band filter is added in the imaging system to obtain light with specific wavelength, and measurement images of light with different wavelengths can be obtained by automatically or manually switching a plurality of narrow-band filters.
Referring to fig. 2, in a preferred embodiment, the non-contact skin oil distribution measuring system further includes a first polarizer 1 disposed on the light source system side and a second polarizer 2 disposed on the imaging system side, the first polarizer 1 and the second polarizer 2 are polarizers with the same polarization direction, the measurement light emitted from the light source system passes through the first polarizer 1 to generate polarized measurement light, and the polarized measurement light is irradiated on the skin, and the light reflected by the skin passes through the second polarizer 2 to filter at least part of the reflected light passing through deep tissues of the skin before entering the imaging system. The polarization direction may be a horizontal polarization direction or a vertical polarization direction, but is not limited thereto.
Through the arrangement of the polaroid, a part of signals containing no grease in the deep layer of the skin are filtered by utilizing the characteristic of polarized light. The polarization of the light, i.e. the direction of vibration of the light, is perpendicular to the direction of propagation of the light. The polarization of light can be classified into natural polarization, linear polarization, circular polarization, and elliptical polarization. After the light is incident into the skin tissue, the polarization direction of the light will be changed into a natural polarization state due to the scattering effect of the biological tissue, that is, the polarization state of the light in all directions in the vibration plane is present, and the polarization state of the light reflected on the skin surface and scattered by the skin tissue with relatively less amount will be consistent with the polarization state of the original incident light. In a preferred embodiment, a polarizer is arranged on the light source system side to keep the incident light on the skin in one polarization direction, and another polarizer with the same polarization direction is arranged on the imaging system side, so that part of the reflected light of the deep tissue of the skin can be filtered, the interference of the part of the reflected light is eliminated, and the measurement accuracy is improved.
As shown in fig. 3, the same horizontal polarizer or vertical polarizer can be used after the source system and before the imaging system to boost the measured effective signal fraction by introducing a polarizer. Since measurement is performed using light of multiple wavelengths, a polarizing plate capable of applying to multiple wavelengths at the same time is also used as the polarizing plate.
In one embodiment, the measurement is performed using horizontally polarized light incidence and the reception is performed using horizontally polarized light, so that the primary signal source for the imaging system is the grease reflected light from the skin surface.
In another preferred embodiment, the non-contact skin oil distribution measuring system further comprises a calibration mask, wherein the calibration mask can be a common mask with uniform thickness and known absorption spectrum, and the calibration mask is used for calibrating the intensity of the detection signal before measuring the oil on the skin surface; wherein, the influence factor of the detection signal strength P is expressed as:
P＝Plight source×fIncident light×fObject to be measured×fEmitting×PDetectorIn which P isLight sourceRepresenting the intensity of the incident light source, fIncident lightRepresenting the influence of the spatial geometrical relationship of the incident ray, fSubstance to be measuredIndicating the influence of the substance to be measured on the light intensity itself, fEmittingRepresenting the influence of the geometrical relationship of the ray exit space, PDetectorIndicating the response of the detector.
In a preferred embodiment using the calibration mask, a personalized intensity calibration can be performed. From a system perspective, the signal strength P detected by the detector can be expressed as: p ═ PLight source×fIncident light×fObject to be measured×fEmitting×PDetector. Wherein P isLight sourceRepresenting the intensity of the incident light source, fIncident lightRepresenting the influence of the light incident system, including the influence of distance and angle, fObject to be measuredIs the influence of the object to be measured on the light intensity, including the content of a certain substance to be detected, fEmittingRepresenting the effect of light exiting the object, and fIncident lightLikewise, there are influences of distance and angle, PDetectorIs the response of the detector. Wavelength pair of the above PLight source，fIncident light，fEmitting，PDetectorEach parameter component has an effect. When using multiple wavelengths to measure tissue composition, the parameter components are calibrated. Theoretically, each component can be calibrated, such as PLight sourceThe intensity distribution of each wavelength light source can be measured independently, so that the spatial distribution calibration and the wavelength calibration of the light sources are realized. However, since the light source and detector themselves also vary with time, fIncident lightAnd fEmittingFurthermore, theThe calibration coefficients vary with the object to be measured, and therefore, a fixed calibration coefficient cannot be used commonly for all objects to be measured.
The above problems are solved by using the calibration mask for personalized intensity calibration. Specifically, the user is allowed to use a thin mask before each measurement. Firstly, since the mask has a thin thickness, for example, the thickness is less than 1mm, the spatial geometrical relative relationship of the mask cannot be influenced, fIncident lightAnd fEmittingEtc. are not affected; second, the absorption is uniform for the same wavelength due to the uniformity across the mask. So that f can be deduced inversely from the last detection signal PObject to be measuredThe relationship in spatial distribution. The uniformity of the whole mask is smaller, the measurement error is smaller, and generally the uniformity is better than 90%. Third, the absorption relationships of the calibration mask to different wavelengths are known and fixed. The effect of different wavelengths on the overall detection system can thus be calculated. More preferably, the calibration mask absorbs the grease so that the objects to be measured have a common initial state, thereby more accurately measuring the concentration and distribution of the grease. By known fObject to be measuredAnd corresponding to the measured P, the influence of other factors, including P, can be eliminatedLight source，fIncident light，fEmittingAnd P isDetector. Through the intensity calibration step, the space influence and the wavelength influence of the imaging system can be eliminated from person to person, and a more accurate measurement result is obtained.
In some embodiments, the spatial position of the features of the measured portion of the human body is calibrated by image recognition techniques prior to non-contact measurement of the skin surface oil of the human body using the measurement system.
In practical situations, when a user performs multiple measurements, the position of a measured part (such as a face) of the user is likely to change, and in order to compare the results of the multiple measurements, the spatial position calibration is performed, which mainly includes the following steps: first, several major feature points of the face, such as eyes, mouth, eyebrows, etc., are identified and labeled. Second, after each measurement, the several feature points are moved to fixed spatial positions. Thirdly, if a state that cannot be completely matched occurs, matching is performed by means of interpolation or spatial transformation.
Embodiments of the present invention further provide a method for performing non-contact measurement on skin oil distribution by using multiple spectra, wherein the content and distribution of oil components on the skin surface are measured by using the non-contact skin oil distribution measurement system according to any of the foregoing embodiments.
The background of the present invention may contain background information related to the problem or environment of the present invention and does not necessarily describe the prior art. Accordingly, the inclusion in the background section is not an admission of prior art by the applicant.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and these substitutions and modifications should be considered to fall within the scope of the invention. In the description herein, references to the description of the term "one embodiment," "some embodiments," "preferred embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the claims.
Claims (10)
1. A non-contact skin oil distribution measuring system is characterized by comprising a light source system and an imaging system, wherein the light source system is configured to emit measuring light with multiple wavelengths to skin, the measuring light with the multiple wavelengths comprises oil component measuring light and at least one non-oil component measuring light, the wavelength of the oil component measuring light corresponds to the wavelength of the absorption light of the oil component on the surface of the skin, the wavelength of the at least one non-oil component measuring light corresponds to the wavelength of the absorption light of at least one non-oil component of skin tissues, and the imaging system collects images of the measuring light reflected by the skin so as to determine the content and the distribution of the oil component on the surface of the skin according to the light intensity and distribution information of the oil component measuring light and the non-oil component measuring light in the images.
2. The system of claim 1, wherein the at least one non-lipid component comprises at least one of water, bilirubin, oxygenated hemoglobin, non-oxygenated hemoglobin, oxygenated myoglobin, non-oxygenated myoglobin, and melanin.
3. The non-contact skin oil distribution measurement system according to claim 1 or 2, wherein the measurement light of the plurality of wavelengths has a wavelength ranging from 600nm to 5000 nm.
4. The system according to any one of claims 1 to 3, wherein the light source system employs a wavelength tunable laser to generate measurement light of multiple wavelengths; or the light source system is a wide-spectrum light source with multiple wavelengths, and measuring light with multiple wavelengths is generated by switching different narrow-band filters on the light source system; or the light source system is a wide-spectrum light source with multiple wavelengths, and measurement light images with multiple wavelengths are acquired by switching different narrow-band filters in the imaging system.
5. The system according to any one of claims 1 to 4, further comprising a first polarizer disposed on the light source system side and a second polarizer disposed on the imaging system side, wherein the first polarizer and the second polarizer are polarizers having the same polarization direction, the measurement light emitted from the light source system passes through the first polarizer to generate polarized measurement light, and the polarized measurement light is irradiated on the skin, and the light reflected from the skin filters at least part of the reflected light passing through deep tissues of the skin before entering the imaging system through the second polarizer.
6. The non-contact skin lipid distribution measurement system of claim 5, wherein the polarization direction is a linear polarization, a circular polarization, or an elliptical polarization direction.
7. The system of any one of claims 1 to 6, further comprising a calibration mask having a uniform thickness and a known absorption spectrum for performing a detection signal intensity calibration prior to measuring skin surface oils; wherein, the influence factor of the detection signal strength P is expressed as:
P＝Plight source×fIncident light×fObject to be measured×fEmitting×PDetectorIn which P isLight sourceRepresenting the intensity of the incident light source, fIncident lightRepresenting the influence of the spatial geometrical relationship of the incident ray, fObject to be measuredIndicating the influence of the substance to be measured on the light intensity itself, fEmittingRepresenting the influence of the geometrical relationship of the ray exit space, PDetectorIndicating the response of the detector, by fObject to be measuredAnd corresponding measured P, thereby eliminating the effects of other factors, including PLight source，fIncident light，fEmittingAnd P isDetector。
8. The system of claim 7, wherein the calibration mask has a lipid absorbing effect.
9. The system of any one of claims 1 to 8, wherein the system is configured to perform spatial position calibration of the measured portion of the human body by image recognition techniques prior to measurement.
10. A non-contact skin oil distribution measuring method characterized in that the content and distribution of the oil component on the skin surface are measured using the non-contact skin oil distribution measuring system according to any one of claims 1 to 9.
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