Method for evaluating pore opening tightening

Abstract

The present invention relates to a method for evaluating pore opening tightening and, more particularly, to a method for evaluating pore opening tightening, the method comprising a step of capturing a magnified image of the skin and then reconstructing a two-dimensional planar image into a three-dimensional stereoscopic image. The method of the present invention enables the observation of pore openings in a magnified image and enables the observation of the pore surface in a three-dimensional stereoscopic image. In particular, the color transformation according to the skin's elevation facilitates the visual observation of the shape and area of the pore openings.

Description

Pore ​​entrance tightening evaluation method

[0001] The present invention relates to a method for evaluating pore entrance tightening, and more particularly, to a method for evaluating pore entrance tightening, which comprises a step of taking an enlarged photograph of the skin and then reconstructing a two-dimensional planar image into a three-dimensional stereoscopic image.

[0002] Pores are affected by external temperature, sebum secretion, lifestyle, stress, and skin aging. Specifically, there are two main causes of enlarged pores. The first is excessive sebum secretion. Sebaceous glands become more active and enlarged after puberty under the influence of androgen hormones, which leads to increased sebum production. Pores naturally enlarge to expel this excess sebum. Enlarged pores are not just visible, but also reflect the enlargement of the entire sebum excretion pathway from the outer layer of the skin to the sebaceous glands. The second cause is skin aging. Even if sebum secretion is low, everyone experiences some degree of pore enlargement with age. This enlargement is a consequence of skin aging. The collagen and elastic fibers that support the pore walls gradually degenerate, causing the skin to lose elasticity. This weakens the ability to tighten the sebum excretion pathway, leading to enlarged pores.

[0003] Once enlarged pores are left untreated, impurities and blackheads harden, impairing skin texture and tone, and causing sagging and wrinkles. Furthermore, fine dust and various bacteria can penetrate these enlarged pores, leading to skin problems like acne and pimples. For these reasons, consumer demand for cosmetics that help reduce the appearance of pores is steadily increasing. Reflecting this trend, the need for new clinical trials that can prove pore-reducing effects is also on the rise.

[0004] The traditional method of measuring pore size involved filming the subject's skin with a video microscope, inputting the images into a computer, magnifying them on a monitor, and then measuring them directly with a measuring instrument. This method, however, had the disadvantage of requiring the subject to manually measure the pores. Furthermore, results could vary even when the same person performed repeated measurements, and results could vary across multiple observers, reducing the accuracy of the assessment.

[0005]

[0006] Accordingly, the inventors of the present invention have completed the present invention by establishing an evaluation method for pore entrance tightening efficacy that can easily visually confirm the degree of pore entrance tightening through image conversion that reconstructs a two-dimensional flat image of a photographed skin into a virtual three-dimensional stereoscopic image.

[0007] The problem to be solved by the present invention is to provide a method for evaluating pore opening tightening, which includes an image conversion step of photographing the skin and reconstructing the photographed two-dimensional planar image of the skin into a virtual three-dimensional stereoscopic image using an image analysis program.

[0008] In order to solve the above problem, the present invention provides a method for evaluating pore entrance tightening, including the steps of: a step of using a skin magnification camera to photograph the skin to obtain a two-dimensional planar image of the skin; and a step of using an image analysis program to correct the background of the obtained two-dimensional planar image of the skin, converting it into a virtual three-dimensional stereoscopic image using a surface plot, and then setting coordinates such that the x-axis is -85 to -65, the y-axis is -60 to -40, and the z-axis is 0, and then designating an AOI (area of ​​image) region to perform a pore entrance tightening analysis.

[0009] The above pore entrance tightening analysis may be at least one selected from the group consisting of pore entrance area analysis, pore entrance length analysis, pore number analysis, and pore density analysis.

[0010] The above pore entrance area analysis can be performed with the average area of ​​pixel values ​​of pores within the AOI region of the converted image, the pore entrance length analysis can be performed with the average diameter value of pores within the AOI region, the pore number analysis can be performed by counting the number of individual pores detected within the AOI region, and the pore density analysis can be performed with the value obtained by dividing the number of individual pores within the AOI region by the area of ​​the AOI region.

[0011] The evaluation method of the present invention allows for the observation of pore opening shapes in an enlarged image, the observation of pore surfaces in a three-dimensional stereoscopic image, and, in particular, the color changes according to skin height, allowing for easy visual observation of pore opening shapes and areas. This enables the provision of differentiated evaluation methods and images for pore opening tightening, thereby enhancing the advertising utility of pore-efficacious cosmetics.

[0012] Figure 1 shows an example of a pore photographing area for using the evaluation method of the present invention.

[0013] Figure 2 compares cases where the magnification is 30x and 60x.

[0014] Figure 3 shows the original image (A) and the image after background correction (B).

[0015] Figure 4 shows an image converted into a three-dimensional (3D) image through a surface plot.

[0016] Figure 5 is an image of a pore area designation (A), an image of a pixel analysis of light green pores within the area (B), and a table (C) analyzing the pore entrance area by confirming the average area through pixel values.

[0017] Figure 6 shows an evaluation of the pore opening tightening efficacy before and after use of the test product. A is the current pore tightening efficacy evaluation advertisement image, and B is the result data image using the evaluation method of the present invention.

[0018] The present invention constructs an evaluation method for pore entrance tightening efficacy that easily visually confirms the degree of pore entrance tightening through image conversion that reconstructs a two-dimensional flat image of a photographed skin into a virtual three-dimensional stereoscopic image, and experimentally verifies this.

[0019]

[0020] Accordingly, the present invention relates to a method for evaluating pore entrance tightening, including the steps of: a step of using a skin magnification camera to photograph the skin to obtain a two-dimensional planar image of the skin; and a step of using an image analysis program to correct the background of the obtained two-dimensional planar image of the skin, converting the image into a virtual three-dimensional stereoscopic image using a surface plot, and then setting coordinates such that the x-axis is -85 to -65, the y-axis is -60 to -40, and the z-axis is 0, and then designating an AOI (area of ​​image) region to perform a pore entrance tightening analysis.

[0021] In the present invention, the photographing step is a step of photographing the skin to be measured using a skin magnifying camera, and the photographing can be performed at an increased magnification so that the pore openings can be seen. At this time, if the magnification is less than 30 times, the pore openings cannot be accurately identified, which affects the pore opening analysis value. In addition, if the magnification exceeds 60 times, fine hairs such as fluff are observed, which affects the pore opening analysis value, making accurate analysis difficult. Therefore, the photographing can be performed at an enlarged magnification of preferably 30 to 60 times, and more preferably 30 to 40 times. In one embodiment of the present invention, the photographing was performed at an enlarged magnification of 30 times so that the pore openings can be seen.

[0022] In the present invention, the skin photographed may be photographed at the side of the nose, preferably at a 1 to 5 cm diameter at the side of the nose, more preferably at a 2 to 3 cm diameter at the side of the nose, but the photographing position and range are not limited, and any position where the pore entrance can be analyzed may be used.

[0023] In the present invention, the image conversion step is a step of reconstructing a two-dimensional planar image of the skin photographed by an image analysis program into a virtual three-dimensional stereoscopic image. First, background correction is performed on the photographed two-dimensional planar image of the skin. The background correction is performed to correct the skin image photographed under uneven lighting due to light reflection as if it were photographed under even lighting, and the accuracy of the evaluation method can be improved through such background correction. After the background correction, the image is converted into a virtual three-dimensional stereoscopic image through a surface plot, and the coordinates of each axis (x-axis, y-axis, z-axis) of the converted image can be set to reconstruct the image into a three-dimensional image. The coordinate settings can be set at an angle at which the skin is expressed in three dimensions so that pores are well visible, and preferably, the x-axis can be -85 to -65, the y-axis can be -60 to -40, and the z-axis can be 0. In one embodiment of the present invention, the x-axis of the converted image is set to -75, the y-axis to -52, and the z-axis to 0, and the Z scale is set to the maximum to distinguish between high and low.

[0024] In the present invention, the analysis step is a step of designating an AOI (area of ​​image) region in a converted image and then performing a pore entrance tightening analysis, and the pore entrance tightening efficacy can be analyzed through parameters such as pore entrance area analysis, pore entrance length analysis, pore number analysis, and pore density analysis. Specifically, the pore entrance area can be analyzed as the average area of ​​the pixel values ​​of the pores within the AOI region of the converted image, the pore entrance length can be analyzed as the average diameter value of the pores within the AOI region, the pore number can be analyzed by counting the number of individual pores detected within the AOI region, and the pore density can be analyzed as the value obtained by dividing the number of individual pores within the AOI region by the AOI region area.

[0025] Hereinafter, the composition and effects of the present invention will be described in more detail through examples. These examples are intended solely to illustrate the present invention, and the scope of the present invention is not limited by these examples.

[0026]

[0027] <Experimental Method>

[0028] 1. Image capture

[0029] Using a skin magnification camera ASW300 (PSIPLUS co., LTD, KOREA), the test area (see Fig. 1) was photographed at 30x magnification in general light pore mode so that the pore entrances could be seen. Fig. 2 compares cases where the magnification is 30x and 60x. When the magnification exceeds 60x, fine hairs such as fluff are observed, which affects the pore entrance analysis value and is therefore not suitable.

[0030]

[0031] 2. Image conversion

[0032] The image was converted through a surface plot, which reconstructs a two-dimensional (2D) flat image into a virtual three-dimensional (3D) stereoscopic image using the image analysis program I-Max-Plus (ING PLUS, Korea). Specifically, the image taken with ASW300 was loaded into the I-MAX program, and the image taken under uneven lighting due to light reflection was corrected through background correction (see Fig. 3). After background correction, the 2D image was converted into a 3D image through the surface plot (see Fig. 4). The angle of the converted image was set to -75 for the x-axis, -52 for the y-axis, and 0 for the z-axis, and the Z scale was set to the maximum to distinguish the height, and the image was generated and analyzed.

[0033]

[0034] [Example 1] Pore entrance tightening analysis

[0035] After designating an AOI (area of ​​image) region for analysis of the same region in the converted image, the pixel values ​​of the light green pores within the AOI region were analyzed. The pore entrance analysis used the parameters (pore entrance area, pore entrance length, pore number, pore density) in Table 1 below. Figure 5 shows an image of the designated pore region (A), an image of pixel analysis of light green pores within the region (B), and a table (C) that analyzes the pore entrance area by confirming the average area through pixel values.

[0036] Specifically, the pore entrance area was analyzed as the average area of ​​the pixel values ​​of the light green pores in the AOI area of ​​the converted image (see value ① in Fig. 5C), and the pore entrance length was analyzed as the average diameter value of the pores in the AOI area (see value ② in Fig. 5C). In addition, the pore number was analyzed by counting the number of individual (sunken) pores detected in the AOI area (see value ③ in Fig. 5C), and the pore density was analyzed as the average number of pores per square pixel in the AOI area, which was calculated by dividing the number of individual pores in the AOI area by the area of ​​the AOI area (see ③ / ④ in Fig. 5C).

[0037] [Pore density calculation formula]

[0038] Pore ​​density = Count / S

[0039] (At this time, Count is the number of individual (sunken) pores, and S is the AOI area)

[0040]

[0041] Parameters: pore entrance area (area, pixel), pore entrance length (length, pixel), pore count (count, ea.), pore density (density, pixel) 2 )Average area value of pores in the analysis method areaAverage diameter value of pores in the analysis method areaNumber of individual (sunken) pores detected in the analysis method areaNumber of individual pores in the analysis method area divided by the area of ​​the AOI area

[0042] Figure 6 shows an evaluation of the pore entrance tightening efficacy before and after use of the test product. A is a current pore tightening efficacy evaluation advertisement image, and B is a result data image using the evaluation method of the present invention. As a result, the degree of pore entrance tightening could be easily visually observed when the evaluation method of the present invention was applied compared to the pore tightening evaluation method of the currently used advertisement image.

[0043]

[0044] Through this invention, we confirmed that color changes based on skin height, enabling easy visual analysis of pore entrance shape and area. Furthermore, by simultaneously analyzing pore entrance area, pore entrance length, pore number, and pore density in a single image, we confirmed that this method can be utilized as a differentiated evaluation method for pore entrance tightening.

Claims

1. A step of using a skin magnification camera to photograph the skin to obtain a two-dimensional flat image of the skin; and A method for evaluating pore entrance tightening, comprising: a step of correcting the background of a two-dimensional flat image of skin obtained by an image analysis program, converting it into a virtual three-dimensional stereoscopic image using a surface plot, setting the coordinates to -85 to -65 for the x-axis, -60 to -40 for the y-axis, and 0 for the z-axis; and then designating an AOI (area of ​​image) region to perform pore entrance tightening analysis; The above pore entrance tightening analysis is at least one selected from the group consisting of pore entrance area analysis, pore entrance length analysis, pore number analysis, and pore density analysis. The above pore entrance area analysis is performed by averaging the pixel values ​​of the pores within the AOI area of ​​the converted image. The above pore entrance length analysis is performed using the average diameter value of pores within the AOI area. The above pore count analysis is performed by counting the number of individual pores detected within the AOI area. A pore entrance tightening evaluation method characterized in that the above pore density analysis is performed by dividing the number of individual pores within an AOI area by the area of ​​the AOI area.

2. A method for evaluating pore entrance tightening, characterized in that in the first paragraph, the skin magnification camera photographs the skin at a magnification of 30 to 60 times.

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