JP2011110354A5 - - Google Patents

Description

Under such circumstances, the present inventors have conducted intensive research and search for an evaluation method that makes skin properties such as softness, elasticity, and smoothness more visually , more realistic, and easier to recognize. . Here, the present inventors have found that in the information processing science and cognitive psychology of the brain, there is a visual superiority in spatial perception, and there is a visual / tactile interaction and a mutual complementing effect. In other words, humans obtain 90% of external information from the sight, and, for example, sensory terms such as softness, elasticity, elasticity, etc. are common terms for sight and touch. And there is an important relationship of mutual complementarity. That is, if skin characteristics are evaluated using such a phenomenon, it can be considered to be a method for evaluating skin characteristics that is easy to feel and recognize, supported by both visual and tactile sensations. More specifically, since a sphere that is dropped or rolled on the skin surface behaves according to the skin characteristics , the change of the sphere on the skin surface correlates with the sensory evaluation value of the skin characteristics. There is a relationship. Therefore, skin characteristics such as tactile softness, elasticity and smoothness can be derived by using the change in the sphere on the skin surface obtained by the measurement as an index . The change of the spheres on the skin surface, since it is possible to visually represent, softness, skin properties such as elasticity and smoothness can be provided as realized with and easily recognizable visual information is human. In this way, using the change of the sphere on the skin surface as an index makes it possible to realize skin characteristics such as visual softness, elasticity, and smoothness, and to realize a discrimination method that feels and is easy to recognize. It was not done.

(1) A method for distinguishing skin characteristics, wherein a change (displacement) of a sphere on the skin surface is photographed by a high-speed camera, and the photographed sphere is subjected to image processing analysis.
(2) The skin characteristic discrimination method according to (1), wherein the skin characteristic is determined by a correlation between a sensory evaluation value of a skin surface state and a characteristic value of a sphere on the skin surface. .
(3) the skin characteristics, characterized in that it is selected from the "softness" or "elasticity", (1) or differentiation method of skin properties described in (2).
(4) The skin characteristic discrimination method according to (1) or (2), wherein the skin characteristic is “smoothness”.
(5) A sphere to be dropped on the skin surface or rolled on the skin surface, a fixing means for holding the sphere, a high-speed camera for photographing a sphere change after the sphere is dropped, and an image photographed by the high-speed camera are processed. discrimination system of skin properties with an analysis and display hand stage for analyzing and display.

After dropping the sphere on the skin on the skin of the subject, embedment shows a variation called that Hanekae, such Such change (displacement) is governed affected by the skin surface condition. That is, as will be apparent from examples described later, for example, if the skin characteristic is “soft”, the sphere that has fallen as the skin is softer sinks into the skin, and the amount of displacement of the sphere that sinks into the skin from the skin surface The “indentation amount” defined as is large (see FIG. 2). A sphere that has fallen into the skin bounces back in the opposite direction after being sunk into the skin, but the greater the `` elasticity '' of the skin characteristics, the greater the amount of sag and the maximum amount of displacement that bounces off the skin surface. The “ bounce amount” is large. FIG. 3 shows the relationship between the amount of displacement of the sphere due to the fall of the sphere and its time.

The fixing means 2 may have a function of temporarily fixing the sphere 1 in the air or on the skin, and then bouncing down after being dropped on the skin, or rolling along the inclination of the skin. A type, a clamp type or a gate type can be preferably exemplified. Here, the position at which the sphere is dropped when evaluating “softness” and “elasticity”, that is, the height H in FIG. 1 is subject to restrictions on the safety of the subject, the size and weight of the sphere, 10-40 cm can be illustrated. When evaluating the "smoothness" for this, preferably the reproducibility is possible gases roller the sphere origin (the height H = 0 cm) on the skin and, when rolled over the skin, the skin It is preferable in terms of reproducibility that the size and weight of the sphere is smaller and lighter than the case where it is dropped.

<Distinction of skin characteristics "soft">
The relationship between the softness of the skin evaluation and the skin characteristics of the present invention was examined by the following methods and conditions, and the results and changes in the sphere were presented to the subject to confirm the validity and actual feeling. That is, after 30 minutes of face washing, a sphere is dropped on the subject's cheek, and image processing analysis is performed on the captured high-speed camera data to calculate the amount of softness “sinking amount” . and analyzed the relationship between the government performance evaluation value. As shown in Table 1, the results of the sensory evaluation value of softness and the amount of penetration were in good agreement, and each subject was fully convinced of the results. From this, it can be seen that the discrimination method of the present invention has the effect of distinguishing the skin characteristics that the subject strongly feels and recognizes by the visual recognition that the sphere sinks into the skin and the tactile recognition that is sensory evaluation.

In Example 1, the number of female subjects was increased (N = 15), and the same analysis and rank correlation analysis / regression analysis were performed. The results are shown in FIG. 4 and the following. From this, it can be seen that the relationship between the two is significant and highly correlated, and that the discrimination method of the present invention has a skin characteristic discrimination effect that makes the subject feel and recognize it strongly. Moreover, by utilizing the obtained regression equation, it can be estimated more recognition easily softness of sensory evaluation, together with visual information providing spheres change by high-speed camera, utilizing such skin counseling You can also.
"Softness" = 1.03 * "Indentation amount" -2.22 (r = 0.718, P <0.01)

<Difference between skin properties of "elasticity">
The skin evaluation in Examples 1 and 2 was changed from softness to elasticity, and after calculating the “ bounce amount”, which is the amount of elastic displacement, examination was performed in the same manner as described above. The results are shown in FIG. From this, it can be seen that the same thing as the skin property “softness” also exists in the skin property “elasticity”, and that the discrimination method of the present invention has a discrimination effect of the skin property that is strongly felt and recognized by the subject.
・ Skin evaluation: Three-stage evaluation based on sensory evaluation profile by three professional evaluators (3: Elasticity-2: Normal-1: No elasticity)
- "elasticity" = 0.30 * "bounce amount" +0.44 (r = 0.687, P < 0.01)

<Test example: Identification of “smoothness” of skin by cream application>
In Example 4, after increasing the number of female subjects (N = 10), washing the inner left forearm 30 minutes, and then applying a certain amount of two types of creams A or B having different smoothness feelings to the skin described below Similarly, a rolling test was performed to calculate the rolling speed. Moreover, all subjects evaluated the smoothness when creams A and B were separately applied. The order of the cream is applied in consideration of the order effect was the opposite half. FIG. 6 is a graph of the average value of 10 rolling speeds of a sphere when creams A and B are applied. 90% of the subjects were evaluated that such because Raka towards the case of applying the cream A. Cream A, which has a smoother skin evaluation than the above, has a significantly higher rolling speed (t-test when there is a correspondence, P <0.0001), and the discrimination method of the present invention is the smoothness of the skin by applying the cream. It can be seen that it can also be used for effect discrimination.

It is a schematic block diagram of a skin characteristic discrimination system. It is a figure which shows the amount of displacements of the amount of retraction of a spherical body, and the amount of rebounds. It is a figure which shows the relationship between the displacement amount of a spherical body, and time. It is a scatter diagram which shows the relationship between the amount of sphere penetration and skin sensory evaluation (softness). It is a scatter diagram which shows the relationship between the amount of rebounds of a sphere, and skin sensory evaluation (elasticity). It is a figure which shows the influence on the rolling speed of cream A, B. FIG.

Claims (5)

  A method for distinguishing skin characteristics, wherein a change (displacement) of a sphere on a skin surface is photographed with a high-speed camera, and the photographed sphere is subjected to image processing analysis.   2. The method for distinguishing skin characteristics according to claim 1, wherein the skin characteristics are determined by a correlation between a sensory evaluation value of a surface condition of the skin and a characteristic value of a sphere on the skin surface. It said skin properties, characterized in that it is selected from the "softness" or "elasticity", differentiation method of the skin characteristics of claim 1 or 2. It said skin properties, characterized in that it is a "smoothness" differentiation method of the skin characteristics of claim 1 or 2. A sphere to be dropped on the skin surface or rolled on the skin surface, a fixing means for holding the sphere, a high-speed camera for photographing a sphere change after the sphere is dropped, and an image photographed by the high-speed camera are processed, analyzed, and displayed differential system of skin characteristics which includes an analysis and display hand stage to perform.