KR101923967B1 - Method for evaluating effects of consmetic composition - Google Patents

Abstract

A method for evaluating the efficacy of a cosmetic composition comprises the steps of: blackening the first skin image before applying the cosmetic and the second skin image after applying the cosmetic; Measuring shading values corresponding to skin structures from each of the monochromeized first skin image and the second skin image; And comparing the shade value measured from the first skin image with the shade value measured from the second skin image to measure the efficacy of the cosmetic material. By applying the principle of densitometry to the evaluation of efficacy of cosmetics, it is possible to objectively evaluate the efficacy, such as the cover power of makeup products, from images taken from the skin.

Description

METHOD FOR EVALUATING EFFECTS OF CONSOMETER COMPOSITION [0002]

More particularly, the present invention relates to a method for evaluating the efficacy of a cosmetic composition by applying the principle of densitometry.

In research and development of cosmetics such as makeup products. A method of objectively evaluating the efficacy of a cosmetic product is required to examine the effect of the cosmetic product. For example, Korean Patent Publication No. 1994-0010069 discloses an apparatus configured to three-dimensionally reconfigure skin images to measure skin structure, volume, or depth as an apparatus for measuring skin tissue before and after application of cosmetic products.

On the other hand, densitometry is a method for quantitatively measuring the density of an optically reacted film in a light-responsive film. When light is received, the film reacts to turn black, and the amount of spot turned into black through the shading measurement can be measured on a unit area. It is also possible to measure a single spot or a continuous line area of a spot. Shading measurement is mainly used as a method of measuring bone density in orthopedic surgeons. That is, it is a method of measuring the bone density by X-ray photographing of a human body followed by a shading measurement method.

Patent Publication No. 1994-0010069

According to one aspect of the present invention, by applying the principle of densitometry to the evaluation of the efficacy of a cosmetic composition, it is possible to provide a makeup product capable of objectively evaluating the efficacy, such as a cover power of a makeup product, Can be provided.

The method of evaluating the efficacy of a cosmetic according to one embodiment includes the steps of: blackening the first skin image before applying the cosmetic and the second skin image after applying the cosmetic; Measuring shading values corresponding to skin structures from each of the monochromeized first skin image and the second skin image; And comparing the shade value measured from the first skin image with the shade value measured from the second skin image to measure the efficacy of the cosmetic material.

The method may further include adjusting the contrast of each of the first skin image and the second skin image that has been monochromated before the step of measuring the shade value corresponding to the skin structure. In this case, the adjusting the contrast may include adjusting the black contrast of the background region excluding the skin in each of the first skin image and the second skin image to be zero.

The shading value may be a brightness of a white spot generated by converting an area corresponding to the skin structure in each of the first skin image and the second skin image.

The second skin image may include a third image captured immediately after application of the cosmetic material and a fourth image captured after a predetermined time has elapsed from the application of the cosmetic material.

In the above method for evaluating the efficacy of a cosmetic composition, the skin structure may include at least one of dots, spots, wrinkles, pores, dullness, acne, or scarring. The cosmetic may be selected from makeup, moisturizing agent, whitening agent, wrinkle agent and ultraviolet screening agent.

According to the method for evaluating the efficacy of a cosmetic according to one aspect of the present invention, it is possible to provide a method for evaluating the efficacy of a cosmetic composition, which does not use a skin replica such as artificial leather, egg, or orange, By applying the principle of densitometry, the efficacy of cosmetics can be measured objectively. The method for evaluating the efficacy of the cosmetic composition may include measuring the cover force against wrinkles or pores of a makeup product, measuring improvement in dullness, acne and scarring caused by use of a makeup product, And the like.

1 is a schematic flowchart of a method for evaluating the efficacy of a cosmetic composition according to an embodiment.
Figure 2a is a schematic perspective view of an exemplary vibration device for applying cosmetics to the skin.
FIG. 2B is a schematic internal configuration diagram of the vibration device disclosed in FIG. 2A. FIG.
3A to 3F are photographs showing first and second skin images obtained from a skin applied with a cosmetic material using a puff according to an embodiment.
4A to 4F are photographs showing first and second skin images obtained from a skin applied with a cosmetic material using a vibration device according to an embodiment.
FIG. 5 is a graph comparing the degree of improvement of dullness when a cosmetic is applied using a puff and when a cosmetic is applied using a vibration device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The method for evaluating the efficacy of a cosmetic composition according to the embodiments of the present invention can be configured to evaluate the efficacy of a cosmetic composition using the principle of densitometry. In the image of a person's skin, when the skin is wrinkled or irregular, a shadow is formed due to the difference in reflection of light. Accordingly, when the image of the skin is photographed in black and white to make the contrast high, the shade value due to the skin structure existing on the skin can be measured. In addition, the efficacy of the cosmetic composition can be evaluated by comparing the measured shade values before and after applying the cosmetic composition. This will be described in detail below.

1 is a schematic flowchart of a method for evaluating the efficacy of a cosmetic composition according to an embodiment.

Referring to FIG. 1, a skin image can be photographed before application of a cosmetic material (S1). Next, the skin image after applying the cosmetic material can be photographed (S2). In the present specification, cosmetics are products to be evaluated for efficacy, and may be makeups, moisturizers, whitening agents, anti-wrinkle agents, ultraviolet screening agents or other cosmetics-related products and may be limited to specific uses and / It does not.

In one embodiment, the skin image taken before application of the cosmetic may be referred to as a first image, and the skin image taken after application of the cosmetic may be referred to as a second image. In addition, the second skin image may include a third image captured immediately after application of the cosmetic and a fourth image captured after a predetermined time has elapsed from the application of the cosmetic.

The first and second skin images may be digital data obtained by scanning a photograph taken through a camera, or images taken in the form of digital data using a digital camera. The first skin image before application of the cosmetic material and the second skin image after application of the cosmetic material are preferably photographed using the same photographing apparatus and method, but the present invention is not limited thereto.

In this embodiment, since the image of the skin can be photographed by a normal camera or a digital camera instead of being photographed by using special equipment, it is possible to use general photography such as X-ray There is an advantage that it is possible to easily evaluate the efficacy of cosmetics.

In one embodiment, the process of applying the cosmetic material to the skin for acquiring the second skin image may be performed using a vibration device. When applying cosmetics with vibrating instruments, it was found to be superior in coating uniformity and adhesion of cosmetic composition compared to general puff application.

FIG. 2A is a schematic perspective view of an exemplary vibration device for applying cosmetics to the skin, and FIG. 2B is a schematic internal configuration diagram of the vibration device disclosed in FIG. 2A.

2A, the outer surface of the vibrating device may be covered by a cap 10, a body cover 20, a body 30, a battery cover 40, and the like. When the cap 10 is peeled off, the puff coated with the cosmetic material may be exposed. Further, the switch 50 can be used to turn on / off the vibration of the vibration device.

Referring to FIG. 2B, the vibration device may include a puff plate 70 and a motor 100. The puff plate 70 is a portion to which the puff 1 coated with the cosmetic material is to be mounted and the puff 1 is fixed on the puff plate 70 by the adhesive layer 60 positioned on the puff plate 70 . The puff plate 70 may be connected to the motor 100 by one or more shafts 80, 90. The puff 1 may contact the surface to be coated with the cosmetic material in a vertical direction. The driving of the motor 100 causes the plate of the puff 70 to reciprocate in the left and right direction of the figure so that the film of the cosmetic material can be formed on the surface of the puff 1 in contact with the puff 1 while vibrating.

As an example of the application process by the vibration device, the cosmetic material is pumped twice in the container containing the cosmetic material so that the cosmetic material is applied to the puff 1 of the vibration device. While the vibration device is vibrated, The cosmetic can be applied to the skin. However, this is an exemplary one, and the application form of the vibration device is not limited to what is described in the present specification.

Next, image processing for applying the principle of densitometry to the skin image before applying the cosmetic and the skin image after applying the cosmetic can be performed. In one embodiment, the image processing procedure described above may be performed using image J (image J), an image processing software commercially available from the National Institutes of Health (NIH). However, this is merely exemplary, and the software for image processing is not limited to those described above, and image processing may be performed by other apparatus and / or software not described herein.

As an image processing process for a skin image, the skin image may be first subjected to black-and-white processing (S3). Since the contrast between black and white is essential for shading measurement, the color of each pixel of the skin image can be converted to black or white according to the brightness of the corresponding pixel. The above process can be performed for each of the first skin image before applying the cosmetic and the second skin image after applying the cosmetic. At this time, it is possible to perform the black-and-white conversion by reversing the brightness so that the dark part is converted into the white spot due to the shadow of the wrinkles and the like. That is, the darker the pixel in the pre-processing image, the more the black and white the image may become so that the image becomes a bright pixel in the black-and-white image.

In one embodiment, the contrast value may additionally be adjusted in each of the monochrome first and second skin images (S4). For example, it is possible to adjust the contrast value so that the black contrast value of the background region excluding the skin in the first and second skin images becomes zero. The additional adjustment of the contrast value can contribute to improving the accuracy of the result.

In the embodiment described herein, it is described that image processing (S3, S4) is performed on the measured image after the skin image before application of the cosmetic material and the skin image after the application of cosmetic material are both measured (S1, S2), but the present invention is not limited thereto . For example, after the skin image before applying the cosmetic material is measured (S1), the image processing (S3, S4) is first performed on the image, the resultant is stored, and then the skin image after the application of the cosmetic material is measured ), The image processing (S3, S4) may be performed again on the skin image after applying the cosmetic material.

As a result of the above-described image processing steps S3 and S4, the pixels corresponding to the skin structure in the first and second skin images can be converted into white spots, and the brightness of the white spot part can correspond to the degree of shading have. In the present specification, the skin structure refers to points, spots, wrinkles, pores, dullness, acne, scars, etc., which are present on the skin and subjected to the efficacy of the cosmetic to be evaluated, but are not limited thereto .

3A to 3F are photographs showing first and second skin images obtained from a skin applied with a cosmetic material using a puff according to an embodiment. FIG. 3 (a) is an image obtained by photographing the skin before application of the cosmetic material, and FIG. 3 (b) is an image of a skin obtained by applying a cosmetic composition by hand using a puff. FIG. 3C is an image obtained by blackening one portion of FIG. 3A, and FIG. 3D is an image obtained by blackening the same portion in FIG. 3B. Further, FIG. 3E is an image obtained by inverting brightness in FIG. 3C, and FIG. 3F is an image obtained by inverting brightness in FIG. 3D.

4A to 4F are photographs showing first and second skin images obtained from a skin applied with a cosmetic material using a vibration device according to an embodiment. FIG. 4A is an image of the skin before the application of the cosmetic, and FIG. 4B is an image of the skin of the skin coated with the cosmetic using a vibration device. 4C is an image obtained by blackening one portion of FIG. 4A, and FIG. 4D is an image obtained by blackening the same portion in FIG. 4B. Further, FIG. 4E is an image obtained by inverting brightness in FIG. 4C, and FIG. 4F is an image obtained by inverting brightness in FIG. 4D.

As shown in Figs. 3 and 4, by comparing the first and second images obtained by blackening the photographs taken before and after the application of the cosmetic, or the first and second images obtained by inverting the brightness in the photographs while making the black and white images, , Shading occurs in a portion where the skin structure such as wrinkles and dullness is present, and it can be confirmed that a change occurs in the shade as a result of application of the cosmetic material.

Next, the shade value corresponding to the skin structure can be measured from each of the first and second skin images (S5). In one embodiment, the shading value may refer to the brightness of the white spot corresponding to the skin structure. For example, shadows caused by unevenness of corrugation or pores are converted into white spots, and the degree of wrinkles or pores can be measured through the brightness of these white spots. Likewise, when image processing is performed in the same way for dullness, acne, spots, etc., it can be converted to a bright spot compared to other areas.

The areas corresponding to skin structures in the first and second skin images can be detected through comparison of shade values. For example, as a result of comparing the brightness of the entire skin, it is recognized that a region located within the boundary line is detected as a white spot corresponding to the skin structure, such as wrinkles, by detecting a boundary line portion having a brightness difference of more than a preset boundary value with the adjacent region can do. The boundary value can be appropriately determined according to the characteristics of the image and the image processing process, and is not limited to a specific value.

Next, the efficacy of the cosmetic material can be evaluated by comparing the shade value measured in the first skin image before application of the cosmetic material with the shade value measured in the second skin image after applying the cosmetic material (S6). In one embodiment, the efficacy of a cosmetic composition may refer to the cover power against points, spots, wrinkles, pores, dullness, acne, or scars, 2 < / RTI > skin image.

Shooting point brightness Coverage Factor Before cosmetic application 158673 - Immediately after cosmetic application 741217 582544 Two hours after cosmetic application 641297 482624

Table 1 shows the skin images taken before application of the cosmetic and the results of comparing the brightness of the spots corresponding to the skin structure in the skin images taken immediately after application of the cosmetic and after 2 hours after the application of the cosmetic. The results shown in Table 1 were calculated from the skin images that did not reverse the contrast, and thus the darkness was recognized as the skin structure and the brightness was measured. Brightness is expressed in arbitrary units obtained by digital data processing, and a larger value means bright. That is, the brightness of each part is inversely proportional to the degree of shading due to the skin structure such as wrinkles. At this time, the value obtained by subtracting the brightness before applying the cosmetic from the brightness after applying the cosmetic corresponds to the covering power of the cosmetic.

For example, in the example shown in Table 1, the covering force immediately after the application of the cosmetic may be represented by 582544 (741217-158673), and the covering force after 2 hours of application of the cosmetic may be represented by 482624 (641297-158673). When the coverage is calculated as a ratio and expressed as a percentage, the value obtained by subtracting the brightness before application of the cosmetic from the brightness after application of the cosmetic is divided by the brightness before application of the cosmetic again, and can be expressed in%. For example, the covering power immediately after application of the cosmetic material can be expressed as 582544/158673 * 100 (%).

Shooting point brightness Coverage Factor Before cosmetic application 421567 - Immediately after cosmetic application 745275 323708 Two hours after cosmetic application 501843 80276

Table 2 shows the skin images taken before application of the cosmetic and the brightness of the spots corresponding to the skin structure in the skin images taken immediately after the application of the cosmetic and after 2 hours after applying the cosmetic using the vibration device . The process of calculating the coverage or coverage using the results shown in Table 2 is the same as that described above with reference to Table 1, and thus a detailed description thereof will be omitted.

However, the above-described cover force calculation process is only illustrative with reference to Table 1 and Table 2, and the calculation method of the cover force or the cover rate is not limited to the above.

In addition, the effectiveness of the cosmetic material measurable by the examples is not limited to the covering force. For example, the method of evaluating the efficacy of a cosmetic composition according to the embodiments can be used not only to measure the coverage of the makeup product against wrinkles or pores, but also to measure the improvement of dullness, acne and scarring caused by use of the makeup product, And the number of existing spots can be verified.

Meanwhile, FIG. 5 is a graph comparing the degree of improvement of dullness when a cosmetic is applied using a puff and when a cosmetic is applied using a vibration device. When applying the cosmetic by hand using the puff, the improvement of the dullness was about 16%. However, when the cosmetic is applied by using the vibration device, the improvement of the dullness is about 61% It can be confirmed that the degree is improved.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. However, it should be understood that such modifications are within the technical scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (7)

A first skin image before application of the cosmetic material and a second skin image after application of the cosmetic material, respectively;
Measuring shading values corresponding to skin structures from each of the monochromeized first skin image and the second skin image; And
Comparing the shade value measured from the first skin image with the shade value measured from the second skin image to measure the efficacy of the cosmetic material,
Wherein the shading value is a brightness of a white spot generated by converting an area corresponding to the skin structure in each of the first skin image and the second skin image,
A region corresponding to the skin structure is detected through comparison of shading values, and a boundary line portion having a brightness difference of at least a preset boundary value with an adjacent region is detected, and a region located within the boundary line is detected as a region corresponding to the skin structure And the amount of the cosmetics is measured.
The method according to claim 1,
Before the step of measuring the shade value corresponding to the skin structure,
Further comprising the step of adjusting contrast of each of the first skin image and the second skin image that has been monochromated.
3. The method of claim 2,
Wherein the step of adjusting the contrast comprises adjusting the black contrast of the background region excluding the skin in each of the first skin image and the second skin image to be zero. Efficacy evaluation method.
delete The method according to claim 1,
Wherein the second skin image includes a third image photographed immediately after the application of the cosmetic material and a fourth image photographed after a predetermined time has elapsed from the application of the cosmetic material.
The method according to any one of claims 1 to 3 and 5,
Wherein the skin structure comprises at least one of dots, spots, wrinkles, pores, dirt, acne, or scarring.
The method according to any one of claims 1 to 3 and 5,
Wherein the cosmetic is selected from the group consisting of makeup, moisturizer, whitening agent, wrinkle agent and ultraviolet screening agent.

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