WO2014174962A1 - 肌のくすみ評価装置及び肌のくすみ評価方法 - Google Patents
肌のくすみ評価装置及び肌のくすみ評価方法 Download PDFInfo
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- WO2014174962A1 WO2014174962A1 PCT/JP2014/058106 JP2014058106W WO2014174962A1 WO 2014174962 A1 WO2014174962 A1 WO 2014174962A1 JP 2014058106 W JP2014058106 W JP 2014058106W WO 2014174962 A1 WO2014174962 A1 WO 2014174962A1
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- dullness
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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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
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/1032—Determining colour for diagnostic purposes
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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
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
-
- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0012—Biomedical image inspection
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30004—Biomedical image processing
- G06T2207/30088—Skin; Dermal
Definitions
- the present application relates to a dull skin evaluation apparatus and a dull skin evaluation method.
- Skin dullness is a specific phenomenon that occurs on the entire face or around the eyes and cheeks, reduces the redness of the skin and increases the yellowness, reduces the "gloss" and transparency of the skin, The lightness is lowered by shadows due to irregularities on the skin surface and the like, and the state appears dark. Also, dullness is caused by a decrease in skin color redness due to poor blood circulation, diffuse melanin deposition, shadows due to unevenness of the skin surface caused by skin elasticity reduction, transparency due to skin thickening (light (Permeability) decrease, decrease in gloss due to diffuse reflection on the skin surface, yellowing of skin with aging, and the like.
- Non-patent documents 1 and 2 There are known methods for quantifying such skin dullness by, for example, the degree of coloration due to melanin polymorphism, the quality of blood flow and blood circulation, the skin surface micro unevenness, and the skin spectral transparency (for example, Non-patent documents 1 and 2).
- an object of the present invention is to appropriately evaluate skin dullness using color unevenness.
- the skin dullness evaluation apparatus obtains skin color information from the color unevenness decomposed by the frequency analysis means that decomposes the skin image into color unevenness of a predetermined size, and the frequency analysis means, Color unevenness index acquisition means for acquiring the color unevenness index of the color unevenness from the acquired color information of the skin, and skin corresponding to the skin image based on the color unevenness index obtained by the color unevenness index acquisition means.
- a dull skin evaluation apparatus characterized by having dull evaluation means for evaluating dullness.
- FIG. 1 shows an example of a functional configuration of a skin dullness evaluation apparatus according to the present embodiment.
- the skin dullness evaluation apparatus 10 includes an input unit 11, an output unit 12, a storage unit 13, an image acquisition unit 14, a frequency analysis unit 15, a color unevenness index acquisition unit 16, It has skin color index acquisition means 17, dullness evaluation means 18, and control means 19.
- Skin dullness evaluation apparatus 10 decomposes, for example, a skin image into color unevenness of a predetermined size, acquires skin color information from the decomposed color unevenness, acquires a color unevenness index from the acquired skin color information, and acquires Based on the color unevenness index, the dullness of the skin corresponding to the skin image is evaluated.
- the input means 11 accepts inputs such as start / end of various instructions regarding skin dullness evaluation processing, settings, and the like from, for example, a user using the skin dullness evaluation apparatus 10.
- the input unit 11 is a pointing device such as a keyboard or a mouse if it is a general-purpose computer such as a PC (Personal Computer).
- the input means 11 may be a voice input device such as a microphone that can input the above-described voice, for example.
- the output unit 12 outputs the content input by the input unit 11 and the content executed based on the input content.
- the output unit 12 is, for example, a display or a speaker.
- the output unit 12 may have a printing device such as a printer.
- the input unit 11 and the output unit 12 described above may have an input / output integrated configuration such as a touch panel, for example, when the skin dullness evaluation apparatus 10 is a smartphone or a tablet terminal. .
- the storage unit 13 stores various information necessary for the present embodiment. Specifically, various programs for executing the skin dullness evaluation process in the present embodiment, various setting information, and the like are stored.
- the storage unit 13 stores, for example, a skin image in which the entire subject's cheek is photographed, a color unevenness index corresponding to the skin image, a skin color index, a dullness index, a dullness determination value, and the like.
- the storage means 13 is a collection of various types of information as described above.
- the storage means 13 may have a function as a database structured systematically so that it can be searched and extracted using keywords or the like. good.
- the information stored in the storage unit 13 may be acquired from an external device via a communication network, for example.
- the image acquisition means 14 acquires, for example, a skin image obtained by photographing the skin of a part where the subject feels dull, for example, by an SIA system (Skin Image Analyzer) composed of a diffuse lighting box and a digital camera.
- SIA system Skin Image Analyzer
- the photographed image can suppress the influence of reflection and shadow on the skin surface by irradiating diffused light, for example, and measures skin “color” to obtain skin color information. It is possible.
- the frequency analysis unit 15 decomposes the skin image obtained by the image acquisition unit 14 into color unevenness of a predetermined size by a band pass filter having a predetermined frequency.
- the frequency analysis unit 15 may decompose the skin image into color unevenness of 4 mm or less.
- the color unevenness index acquisition unit 16 acquires skin color information from the color unevenness decomposed into a predetermined size by the frequency analysis unit 15, and acquires the color unevenness index from the acquired skin color information.
- the skin color information is, for example, an RGB color system RGB value of a photographed skin image, an XYZ color system XYZ value converted from the RGB color system, or the like.
- the color unevenness index acquisition means 16 may acquire the color unevenness index based on the distribution state of pigment components such as melanin components obtained from skin color information.
- the color unevenness index acquisition means 16 is decomposed into a melanin component and a hemoglobin component in the skin using, for example, a method described in Japanese Patent No. 3798550 of the present applicant, and obtains the amount of each component. And good. That is, the color unevenness index acquisition means 16 performs multiple regression analysis using, for example, the skin reflection spectrum, the absorbance model in which the transmittance in the Lambert-Beer law is replaced with the skin reflectance, and the absorption coefficient spectrum of the skin component. By performing, the amount of components such as melanin components in the skin is obtained.
- the color unevenness index acquisition means 16 may obtain the amount of a component such as a melanin component in the skin using a technique described in Japanese Patent No. 3727807 of the present applicant. That is, the color unevenness index acquisition means 16 obtains a multiple regression equation in advance by performing multiple regression analysis on the data of the side color value of the skin and the amount of components such as melanin component in the skin, and uses the multiple regression equation to obtain the side of the skin The amount of components such as melanin components in the skin may be obtained from the color value.
- the color unevenness index acquisition unit 16 generates a density value equal to or higher than the density average value and a density value equal to or higher than the density average value by generating an image indicating the density and distribution state of the predetermined pigment component obtained by the above-described method. Multiplying and integrating the number of pixels having a color, the color unevenness is quantified, and the color unevenness index is obtained.
- Skin color index acquisition means 17 acquires a skin color index based on the skin color information obtained by color measurement from the skin image obtained by the image acquisition means 14 or the skin part corresponding to the skin image.
- the skin color index acquisition means 17 is a dullness based on, for example, a “pigmentation index” based on the component amount of the melanin component, a congestion condition index based on hemoglobin oxygen saturation, and a color unevenness index obtained by the color unevenness index acquisition means 16 as the skin color index. Get color unevenness index.
- the dullness evaluation means 18 evaluates the dullness of the skin corresponding to the skin image based on the color unevenness index obtained by the color unevenness index acquisition means 16.
- the dullness evaluation means 18 may evaluate the dullness of the skin for each index that affects the skin color based on the skin color index obtained by the skin color index acquisition means 17. Further, the dullness evaluation means 18 may comprehensively evaluate the dullness of the skin corresponding to the skin image based on the dullness index of the skin obtained by performing multiple regression analysis using the skin color index.
- the control means 19 controls the entire components of the skin dullness evaluation apparatus 10.
- the control means 19 controls at least one of, for example, acquisition of a color unevenness index, acquisition of a skin color index, acquisition of a dullness index, skin dullness evaluation processing, and the like.
- ⁇ Dullness evaluation device for skin hardware configuration>
- an execution program for causing the computer to execute each function of the above-described skin dullness evaluation apparatus 10 is generated and installed in, for example, a general-purpose PC or server. Thereby, it is possible to realize the dull skin evaluation process and the like in the present embodiment.
- FIG. 2 is a diagram illustrating an example of a hardware configuration capable of realizing the skin dullness evaluation process.
- 2 includes an input device 21, an output device 22, a drive device 23, an auxiliary storage device 24, a memory device 25, a CPU (Central Processing Unit) 26 for performing various controls, and a network connection device. 27, and these are connected to each other by a system bus B.
- CPU Central Processing Unit
- the input device 21 has a keyboard, a pointing device such as a mouse operated by a user, a voice input device such as a microphone, and the like, and inputs various operation signals such as execution of a program from the user.
- the input device 21 has an input unit for inputting a skin image of a subject photographed using, for example, a diffuse lighting box and a digital camera.
- the output device 22 has a display for displaying various windows, data, and the like necessary for operating the computer main body that performs the processing according to the present embodiment, and displays the execution progress, results, and the like by a control program that the CPU 26 has.
- the execution program installed in the computer main body in the present embodiment is provided by a portable recording medium 28 such as a USB (Universal Serial Bus) memory or a CD-ROM, for example.
- the recording medium 28 can be set in the drive device 23, and an execution program included in the recording medium 28 is installed from the recording medium 28 to the auxiliary storage device 24 via the drive device 23.
- the auxiliary storage device 24 is a storage means such as a hard disk, and stores an execution program in the present embodiment, a control program provided in a computer, and the like, and can perform input / output as necessary.
- the memory device 25 stores an execution program read from the auxiliary storage device 24 by the CPU 26.
- the memory device 25 is a ROM (Read Only Memory), a RAM (Random Access Memory), or the like. Note that the auxiliary storage device 24 and the memory device 25 described above may be configured integrally as one storage device.
- the CPU 26 controls processing of the entire computer, such as various operations and input / output of data with each hardware component, based on a control program such as an OS (Operating System) and an execution program stored in the memory device 25.
- a control program such as an OS (Operating System) and an execution program stored in the memory device 25.
- OS Operating System
- execution program stored in the memory device 25.
- the network connection device 27 acquires an execution program from another device connected to the communication network by connecting to a communication network such as the Internet or a LAN (Local Area Network). Further, the network connection device 27 can provide the execution result obtained by executing the program or the execution program itself in the present embodiment to another device or the like.
- a communication network such as the Internet or a LAN (Local Area Network).
- the above-described hardware configuration makes it possible to execute the skin dullness evaluation process in the present embodiment. Further, by installing the execution program, the skin dullness evaluation process in the present embodiment can be easily realized by a general-purpose PC or the like.
- FIG. 3 is a diagram showing the results of a color awareness survey on dull skin.
- the survey in Fig. 3 shows that 31 women who answered "I am concerned about skin dullness” by self-reported to healthy women in their 35s and 50s during the summer and winter periods. It shows the result of an investigation as to whether or not 31 people who answered “I have a feeling” feel color unevenness.
- 4 (A) and 4 (B) are diagrams showing an example of visual evaluation for a skin image.
- 4A and 4B show an example in which an experienced sensory evaluator (panelist) visually evaluates whether each skin image feels dull skin.
- the skin image shown in FIG. 4 (A) was evaluated to feel dull skin, whereas the skin image in FIG. 4 (B) was evaluated to feel skin blotting. Has been.
- FIG. 4A is compared with FIG. 4B, the color unevenness of the subject in FIG. 4A is smaller than the color unevenness of the subject in FIG. 4B. small.
- the example evaluated to feel dull skin shows that the size of the color unevenness is small, and the size of the color unevenness affects the dullness of the skin.
- FIG. 5 is a diagram for explaining a procedure for obtaining a color unevenness index from a skin image.
- the image acquisition unit 14 acquires an image a of the skin (skin) on the cheek site of the subject taken using, for example, a diffuse lighting box and a digital camera.
- the acquired skin image has a wide cheek region from the side of the subject's nose to the ear as the analysis target region b, for example, a bear under the subject's eyes, wrinkles around the eyes, and a frying line. It is preferable to acquire an image excluding the above.
- the frequency analysis unit 15 decomposes the analysis target region b of the image obtained by the image acquisition unit 14 into a color unevenness of a predetermined size as an original image (skin image) and decomposes the color unevenness of a predetermined size.
- the frequency analysis means 15 uses a band-pass filter or the like having a predetermined frequency to extract a small-sized color unevenness with a half width of about 0 to 2 mm, and a half width of about 2 to 10 mm.
- An image d from which medium-sized color unevenness is extracted and an image e from which large-sized color unevenness having a half width of about 10 to 40 mm is extracted.
- the color unevenness index obtaining means 16 is provided for each of the image c from which the small size color unevenness is extracted by the frequency analyzing means 15, the image d from which the medium size color unevenness is extracted, and the image e from which the large size color unevenness is extracted. Get skin color information.
- the color unevenness index acquisition means 16 is, for example, a density value equal to or higher than the density average value and a density value equal to or higher than the density average value from the density and distribution state of a predetermined pigment component obtained based on the skin color information of each image. Is multiplied by the number of pixels having, and the multiplied values are integrated to obtain a color unevenness index.
- the frequency analysis means 15 and the color unevenness index acquisition means 16 can use, for example, the technique described in Japanese Patent Application Laid-Open No. 2011-240086 of the present applicant.
- FIG. 6A and FIG. 6B are diagrams illustrating an example of a correlation between dull skin and color unevenness.
- 6A shows an example of the correlation between the dullness of the skin and the color unevenness of each size
- FIG. 6B shows the example of the correlation between the dullness of the skin and the pigment component of the color unevenness. It is.
- FIG. 6 (A) shows an average value of visual evaluation in which 124 subjects evaluated the degree of skin dullness (from “not conspicuous” to “conspicuous”) by five sensory evaluators. And a correlation coefficient based on the color unevenness index of each size quantified by the procedure of FIG.
- the correlation coefficient between the dullness of the skin and the small-size color unevenness, the medium-size color unevenness, and the large-size color unevenness increases as the color unevenness size decreases. That is, it is shown that small-sized color unevenness affects the dullness of the skin.
- FIG. 6B shows the correlation based on the average value of visual evaluation of 124 subjects and the color unevenness index for each small-sized pigment component quantified by the procedure of FIG. 5C. Shows the number.
- the color unevenness of the hemoglobin component is not so different in the value of the correlation coefficient for dull skin.
- the color unevenness of the melanin component has a significant difference in the value of the correlation coefficient for dull skin. That is, it is shown that the color unevenness of the melanin component affects the dullness of the skin.
- FIG. 7 is a schematic diagram in which color unevenness is added to the definition of skin dullness.
- the dullness of the skin includes color unevenness of a small size, and for example, color unevenness of a melanin component has an influence. Therefore, the definition of skin dullness in which color unevenness is newly added to the conventional definition of skin dullness will be schematically described.
- the dullness of the skin is explained by dividing it into “skin color” and “skin texture” from the appearance of the skin.
- the dullness of the skin can be explained by the “texture of the skin”.
- the skin dries due to a decrease in water retention capacity, the skin becomes “glossy”, and the stratum corneum is carbonylated (opaque) and horny.
- the skin is characterized by “no transparency”.
- Skin dullness can be explained by “skin color”.
- the average color is a characteristic of the skin due to carbonylation (yellowing) of the dermis, an increase in the amount of melanin, and a decrease in Hb oxygen saturation indicating a blood flow state. ) Becomes yellowish and dark, and it becomes tinged. Further, as shown in FIG. 7, the dullness of the skin can be described as a state in which color unevenness occurs as a characteristic of the skin due to, for example, occurrence of small-size color unevenness of the melanin component.
- FIG. 8A and FIG. 8B are diagrams for explaining the influence of the color unevenness size on the dullness of the skin.
- FIGS. 6A and 6B described above it has been shown that small-size color unevenness affects the dullness of the skin. Analyze whether it is affected.
- color unevenness of a size (0 to 1 mm, 0 to 2 mm,... 0 to 10 mm) that is changed stepwise is extracted, and the procedure shown in FIG. An example in which eight patterns of color unevenness index are obtained from one subject is shown.
- “0 to 1 mm” indicates color unevenness of 1 mm or less.
- the color unevenness index may be obtained by, for example, color unevenness density ⁇ area (the integrated value of the color difference ⁇ E of each pixel of the extracted color unevenness).
- the eight patterns of color unevenness index are obtained from the 124 subjects described above, and the obtained color unevenness index and four subjects for each subject as in FIGS. 6 (A) and 6 (B).
- the correlation coefficient is obtained using the average value of the visual evaluation of the sensory evaluator.
- FIG. 8B shows the value of the correlation coefficient between the dullness of the skin and the extracted size of the eight patterns of color unevenness.
- the value of the correlation coefficient with respect to the skin dullness of the color unevenness extraction size increases as the color unevenness extraction size increases, for example, at 0 to 4 mm.
- the value of the correlation coefficient with respect to skin dullness is almost constant.
- the relationship between the color unevenness of a size larger than 4 mm and the dullness of the skin is almost the same, indicating that the color unevenness of 0 to 4 mm size affects the dullness of the skin.
- the color unevenness of 0 to 4 mm size affects the dullness of the skin, and therefore will be described as “dull color unevenness”, for example.
- FIG. 9A and FIG. 9B are diagrams showing an example of extracting color unevenness of a size that affects the dullness of the skin.
- FIG. 9A shows an example of skin determined to have high transparency
- FIG. 9B shows an example of skin determined to have noticeable skin dullness.
- a dull color unevenness (color unevenness of a size of 0 to 4 mm) is extracted, and the procedure shown in FIG.
- the color unevenness index is obtained from the density ⁇ area (the integrated value of the color difference ⁇ E of each pixel of the extracted color unevenness).
- the color unevenness index of the dull color unevenness obtained as described above was “22.9”, whereas the skin dullness shown in FIG. For the skin with noticeable, the color unevenness index of the dull color unevenness was “52.4”.
- the value of the color unevenness index obtained by quantifying the dull color unevenness that affects the dullness of the skin has a clear difference between the skin having a high transparency and the skin in which the dullness is conspicuous. Therefore, in this embodiment, it is possible to evaluate the dullness of the skin using, for example, the value of the color unevenness index obtained by quantifying the dull color unevenness.
- FIG. 10 is a diagram for explaining a skin color evaluation method defined by skin dullness.
- the skin color defined as the dullness of the skin is the melanin component in addition to the effects of carbonylation of the dermis, an increase in melanin amount, and a decrease in Hb oxygen saturation indicating a blood flow state.
- the skin color defined as the dullness of the skin is the melanin component in addition to the effects of carbonylation of the dermis, an increase in melanin amount, and a decrease in Hb oxygen saturation indicating a blood flow state.
- Hb oxygen saturation indicating a blood flow state.
- the skin color defined by the dullness of the skin is digitized, and the skin color can be evaluated by evaluating the skin color based on the digitized value.
- the skin color is digitized using, for example, “melanin amount”, “Hb oxygen saturation” representing the blood flow state, and “dull color unevenness” among factors affecting the skin color.
- the “melanin amount” and “Hb oxygen saturation” can be obtained by, for example, side-coloring a skin image or a skin part corresponding to the skin image.
- “dull color unevenness” as shown in FIGS. 9A and 9B described above, for example, color unevenness having a size of 0 to 4 mm is extracted, and the extracted color unevenness is quantified.
- the “dull color unevenness index” is used.
- the “melanin amount”, “Hb oxygen saturation”, and “color unevenness index” are converted into deviation values (scores), and the scored values are used.
- the scored value is used as the “pigmentation index”.
- “Hb oxygen saturation” represents a blood flow state.
- the “Hb oxygen saturation” is the congested blood obtained by subtracting the scored “Hb oxygen saturation” from a predetermined value (for example, 100).
- a “congestion state index” indicating the value of the state is used.
- the “dull color unevenness” a value obtained by scoring the color unevenness index is used as the “dull color unevenness index”.
- (X-Ave) / Stdev ⁇ 10 + 50 is used for scoring.
- the “melanin amount” is 1.071, for example, 45.61 is obtained as the “pigmentation index”.
- the “Hb oxygen saturation” is 56.63, 44.20 is obtained as the “congestion state index”.
- the “dark color unevenness” is 30.48, 38.99 is obtained as the “dark color unevenness index”.
- the skin color index acquisition means 17 acquires the “pigmentation index”, “congestion state index”, and “dull color unevenness index” obtained as described above as the “skin color index” obtained by quantifying the skin color.
- FIG. 11A and FIG. 11B are diagrams for explaining the dullness index.
- FIG. 11A shows an example of the dullness index estimation formula
- FIG. 11B is a diagram showing the relationship between the dullness index and the sensory evaluation value.
- the dullness index is obtained as follows using the skin color index (pigmentation index, congestion state index, dullness unevenness index).
- the dullness index estimation formula shown in FIG. 11 (A) is a function value using the values of the pigmentation index, the congestion state index, and the dull color unevenness index obtained from the measurement data of the 124 subjects described above as explanatory variables, The function is determined by determining the coefficient of each explanatory variable by multiple regression analysis with the sensory evaluation value (dependent variable).
- FIG. 11B shows, for example, 61 subjects with respect to the dull index obtained by substituting the pigmentation index, the stasis status index, and the dull color unevenness index into the dull index estimation formula shown in FIG. 2 shows an example of a result obtained by verifying the obtained measurement data.
- FIG. 12 is a flowchart showing a flow of processing for obtaining a skin dullness index.
- the skin color index acquisition means 17 acquires the XYZ value from the reflection spectrum data obtained by side-coloring the skin or the skin image (S10), the melanin amount (melanin component) is obtained from the acquired data and the like. Component amount) is calculated (S11), and the calculated melanin amount is scored to obtain a "pigmentation index" (S12).
- the skin color index acquisition means 17 acquires the Hb oxygen saturation (S13), it obtains a “congestion state index” indicating a congested state (S14).
- the amount of melanin and the Hb oxygen saturation may be acquired by using the methods described in Japanese Patent No. 3798550 and Japanese Patent No. 3727807, respectively, of the present applicant.
- the skin color index acquisition means 17 acquires the color unevenness index obtained from the color unevenness index acquisition means 16 (S15), it obtains a “dull color unevenness index” (S16).
- the skin color index acquisition means 17 calculates the dullness index by substituting the value acquired by the processing of S12, S14, and S16 into, for example, the dullness index estimation formula obtained by the multiple regression model (S17), and performs the processing. finish.
- FIGS. 13A and 13B are diagrams illustrating specific examples of skin color dullness determination values.
- FIG. 13A shows an example of each index and skin color dullness determination of an evaluation subject
- FIG. 13B shows an example of an evaluation criterion used when evaluating the value of each index in five stages. Yes.
- the pigmentation index is “T46.14”
- the congestion state index is “T47.20”
- the dull color unevenness index is “T38.77”
- the dullness index is “2.33”.
- the overall dullness judgment value is” 2 slightly weak ".
- a reference point to be divided into each stage is set, “Small”, “Slightly small”, “Normal”, “Slightly large”, “Large”.
- the scored value “41.58” is used as a reference point, and is divided into “small” and “somewhat small”.
- the scored value “47.47” is used as a reference point, and is divided into “somewhat small” and “normal”.
- the dullness evaluation means 18 uses the evaluation criteria in FIG. 13B, and in the case of “female A” in FIG. 13A, uses the pigmentation index “T46.14” to be “slightly small”. ”And can be evaluated as“ slightly small ”using the congestion state index“ T47.20 ”. Further, the dullness evaluation means 18 determines that the dullness determination value of the overall skin color is “slightly weak” by using the dullness index “2.33” obtained from the dullness index estimation formula, for example, and dullness of the skin Can be evaluated.
- FIG. 14A and FIG. 14B are diagrams showing an example of skin color dullness determination.
- FIG. 14A shows a skin image used for skin color dullness determination
- FIG. 14B shows a determination value of each index of the skin image shown in FIG.
- the skin image shown in FIG. 14 (A) shows an example in which the dullness determination value is determined to be “4 slightly strong” based on each index described above.
- each of the pigmentation index, the congestion state index, and the dull color unevenness index is divided into, for example, five levels.
- each of the pigmentation index “2.6”, the congestion state index “5”, and the dull color unevenness index “2” is a vertex. It is possible to represent the triangle 40.
- the triangle 41 shown to FIG. 14 (B) shows the average data of the skin determined to have transparency
- the triangle 42 shown to FIG. 14 (B) has the average data of the skin determined to have dullness. Indicates.
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Abstract
Description
図1は、本実施形態における肌のくすみ評価装置の機能構成の一例を示している。図1に示すように、肌のくすみ評価装置10は、入力手段11と、出力手段12と、記憶手段13と、画像取得手段14と、周波数解析手段15と、色ムラ指数取得手段16と、肌色指数取得手段17と、くすみ評価手段18と、制御手段19とを有する。
ここで、上述した肌のくすみ評価装置10の各機能をコンピュータに実行させる実行プログラム(肌のくすみ評価プログラム)を生成し、例えば汎用のPC、サーバ等にインストールする。これにより、本実施形態における肌のくすみ評価処理等を実現することが可能となる。
ここで、肌のくすみと色ムラとの関係について説明する。上述したように、従来、肌のくすみの定義に、色ムラの影響については具体的に考慮されていなかった。しかしながら、本出願人の調査結果では、肌のくすみには色ムラの影響が示されている。
そこで、以下のように、色ムラを所定のサイズに分解し、分解された色ムラを数値化して色ムラ指数を求め、肌のくすみと色ムラとの相関関係を検討する。図5は、肌画像から色ムラ指数を取得する手順を説明するための図である。
図6(A)及び図6(B)は、肌のくすみと色ムラとの相関関係の一例を示す図である。図6(A)は、肌のくすみと各サイズの色ムラとの相関関係の一例を示し、図6(B)は、肌のくすみと色ムラの色素成分との相関関係の一例を示す図である。
図8(A)及び図8(B)は、肌のくすみに対する色ムラサイズの影響を説明するための図である。上述した図6(A)及び図6(B)の例では、肌のくすみには小さなサイズの色ムラが影響していることを示していたが、具体的にどの程度のサイズの色ムラが影響しているか分析する。
図9(A)及び図9(B)は、肌のくすみに影響するサイズの色ムラを抽出した例を示す図である。なお、図9(A)は、透明感が高いと判定された肌の一例を示し、図9(B)は、肌のくすみが目立つと判定された肌の一例を示している。
図10は、肌のくすみに定義される肌色の評価方法を説明するための図である。図7を参照して上述したように、肌のくすみに定義される肌色は、真皮のカルボニル化や、メラニン量の増加、血流状態を示すHb酸素飽和度の低下による影響に加え、メラニン成分の小サイズの色ムラ等により影響される。
図11(A)及び図11(B)は、くすみ指数について説明するための図である。図11(A)は、くすみ指数推定式の一例を示し、図11(B)は、くすみ指数と官能評価値との関係を示す図である。
図12は、肌のくすみ指数を取得する処理の流れを示すフローチャートである。
図13(A)及び図13(B)は、肌色のくすみ判定値の具体例を示す図である。図13(A)は、評価対象者の各指数及び肌色のくすみ判定の一例を示し、図13(B)は、各指数の値を5段階で評価するときに用いる評価基準の一例を示している。
図14(A)及び図14(B)は、肌色のくすみ判定例を示す図である。図14(A)は、肌色のくすみ判定に用いられた肌画像を示し、図14(B)は、図14(A)に示す肌画像の各指数の判定値を示している。
発明は上記実施例で説明したものに限定されるものではなく、その要旨を逸脱しない範囲
で種々変更可能である。
11 入力手段
12 出力手段
13 記憶手段
14 画像取得手段
15 周波数解析手段
16 色ムラ指数取得手段
17 肌色指数取得手段
18 くすみ評価手段
19 制御手段
31 入力装置
32 出力装置
33 ドライブ装置
34 補助記憶装置
35 メモリ装置
36 CPU
37 ネットワーク接続装置
38 記録媒体
Claims (15)
- 肌画像を所定サイズの色ムラに分解する周波数解析手段と、
前記周波数解析手段により分解された前記色ムラから肌の色情報を取得し、取得した前記肌の色情報から、前記色ムラの色ムラ指数を取得する色ムラ指数取得手段と、
前記色ムラ指数取得手段により得られた前記色ムラ指数に基づき、前記肌画像に対応する肌のくすみを評価するくすみ評価手段と、
を有することを特徴とする肌のくすみ評価装置。 - 前記周波数解析手段は、
前記所定のサイズとして、前記肌画像を4mm以下の色ムラに分解することを特徴とする請求項1に記載の肌のくすみ評価装置。 - 前記色ムラ指数取得手段は、
前記肌の色情報から得られる所定の色素成分の分布状態に基づき、前記色ムラ指数を取得することを特徴とする請求項1に記載の肌のくすみ評価装置。 - 前記所定の色素成分は、メラニン成分であることを特徴とする請求項3に記載の肌のくすみ評価装置。
- 前記肌画像又は前記肌画像に対応する肌の部位から得られる肌の色情報に基づき、肌色指数を取得する肌色指数取得手段を有し、
前記くすみ評価手段は、
前記肌色指数取得手段により得られる前記肌色指数に基づき、前記肌画像に対応する肌のくすみを評価することを特徴とする請求項1に記載の肌のくすみ評価装置。 - 前記肌色指数取得手段は、
前記肌色指数として、メラニン成分の成分量に基づく色素沈着指数、ヘモグロビン酸素飽和度に基づく鬱血状態指数、又は前記色ムラ指数に基づくくすみ色ムラ指数を取得することを特徴とする請求項5に記載の肌のくすみ評価装置。 - 前記くすみ評価手段は、
前記くすみ色ムラ指数、前記色素沈着指数、及び前記鬱血状態指数を用いて重回帰分析を行うことにより得られる肌のくすみ指数に基づき、前記肌画像に対応する肌のくすみを評価することを特徴とする請求項6に記載の肌のくすみ評価装置。 - コンピュータにより実行される肌のくすみ評価方法であって、
肌画像を所定サイズの色ムラに分解する周波数解析手順と、
前記周波数解析手順により分解された前記色ムラから肌の色情報を取得し、取得した前記肌の色情報から、前記色ムラの色ムラ指数を取得する色ムラ指数取得手順と、
前記色ムラ指数取得手順により得られた前記色ムラ指数に基づき、前記肌画像に対応する肌のくすみを評価するくすみ評価手順とを有することを特徴とする肌のくすみ評価方法。 - 前記周波数解析手順は、
前記所定のサイズとして、前記肌画像を4mm以下の色ムラに分解することを特徴とする請求項8に記載の肌のくすみ評価方法。 - 前記色ムラ指数取得手順は、
前記肌の色情報から得られる所定の色素成分の分布状態に基づき、前記色ムラ指数を取得することを特徴とする請求項8に記載の肌のくすみ評価方法。 - 前記所定の色素成分は、メラニン成分であることを特徴とする請求項10に記載の肌のくすみ評価方法。
- 前記肌画像又は前記肌画像に対応する肌の部位から得られる肌の色情報に基づき、肌色指数を取得する肌色指数取得手順を有し、
前記肌のくすみ評価手順は、
前記肌色指数取得手順により得られる前記肌色指数に基づき、前記肌画像に対応する肌のくすみを評価することを特徴とする請求項8に記載の肌のくすみ評価方法。 - 前記肌色指数取得手順は、
前記肌色指数として、メラニン成分の成分量に基づく色素沈着指数、ヘモグロビン酸素飽和度に基づく鬱血状態指数、又は前記色ムラ指数に基づくくすみ色ムラ指数を取得することを特徴とする請求項12に記載の肌のくすみ評価方法。 - 前記くすみ評価手順は、
前記くすみ色ムラ指数、前記色素沈着指数、及び前記鬱血状態指数を用いて重回帰分析を行うことにより得られる肌のくすみ指数に基づき、前記肌画像に対応する肌のくすみを評価することを特徴とする請求項13に記載の肌のくすみ評価方法。 - コンピュータを、
請求項1に記載のくすみ評価装置が有する各手段として機能させるための肌のくすみ評価プログラムを記憶する記録媒体。
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