JP4312627B2 - Evaluation method of foundation - Google Patents

Description

  The present invention relates to a method for evaluating a cosmetic foundation.

Some cosmetic foundations not only improve the riding of other cosmetics used on the foundation, but also have an effect of correcting facial sagging.
The sagging correction effect of the foundation does not actually restore the skin tension but is an effect of making the sagging inconspicuous.
In order to evaluate a foundation that has such a sag correction effect, it is necessary to determine whether or not the sag is less noticeable when the foundation is used than when the foundation is not used.

JP 2001-190525 A

However, when a specific foundation is used, it is difficult to accurately determine whether or not the sag is corrected. For example, when a face using a foundation is compared with an actual face, it is difficult for a person to judge whether it is a result of correcting sagging, even if it looks more beautiful or youthful than an actual face.
The evaluation may vary depending on the sensory variation of the judge, and there may be a difference in how the effect appears depending on the individual characteristics of the subject.

For example, for a person with a face that has little sagging from the beginning, even if a foundation having a sagging correction effect is used, the effect is difficult to understand. On the other hand, even if the slack is severe, the correction effect may be difficult to see.
Therefore, it was difficult to evaluate the sagging correction effect of the foundation itself.
An object of the present invention is to provide a foundation evaluation method capable of quantitatively evaluating the sagging correction effect of the foundation.

  The first invention averages the face images of a plurality of persons using the foundation to be evaluated using a morphing technique, and converts the brightness distribution of the averaged virtual face image to lightness contour lines of a plurality of gradations. Among these lightness contour lines, the lightness contour line of a specific lightness formed around the cheekbone is taken as a reference contour line, and the straight line from the lowest position in the jaw direction of this reference contour line toward the most inflated portion outside the sinus cavity It is characterized in that the sagging correction effect is evaluated from the measurement angle formed with the horizontal line.

  The second invention is based on the first invention, averages the face images of a plurality of persons using the morphing technique for each age, and the brightness distribution of the averaged virtual face image for each age. Is represented by a multi-tone lightness contour line, and the lightness contour line of a specific lightness formed around the cheekbones among these lightness contour lines is defined as a reference contour line, and from the lowest position in the jaw direction of the reference contour line, The reference angle is specified by classifying the angle formed by the straight line toward the expansion part and the horizontal line for each age, and the reference angle for each age is compared with the measurement angle, and the measurement angle corresponds to which age. It is characterized in that it is specified and the sagging correction effect is evaluated.

  The third invention is based on the first invention, averages face images of a plurality of people using a natural face or a specific foundation using a morphing technique for each age, and averages the virtual images The brightness distribution of the face image is represented by lightness contours of multiple gradations, and among these lightness contours, the lightness contour of a specific lightness formed around the cheekbone is taken as the reference contour, and the sinus from the lowest position in the jaw direction of this reference contour It is characterized in that the angle formed by the straight line toward the outermost inflated part and the horizontal line is specified as a reference angle, and the sagging correction effect is evaluated by comparing the reference angle with the measurement angle.

  The fourth invention averages the face images of a plurality of persons using the foundation to be evaluated using a morphing technique, and converts the brightness distribution of the averaged virtual face image to brightness contours of a plurality of gradations. Among these lightness contour lines, the lightness contour line of a specific lightness formed around the cheekbone is used as a reference contour line, and the sag correction effect is evaluated according to the measurement area surrounded by the reference contour line.

  The fifth invention is based on the fourth invention, averages the face images of a plurality of persons using the morphing technique for each age, and the brightness distribution of the averaged virtual face image for each age. Is represented by multi-tone lightness contours, and among these lightness contours, the lightness contours of a specific lightness formed around the cheekbone are defined as reference contours, and the area surrounded by the reference contours is defined as the reference area for each era. This is characterized in that the sagging correction effect is evaluated by comparing the reference area with the measurement area.

  The sixth invention is based on the fourth invention, and averages the face images of a plurality of persons using a natural face or a specific foundation using a morphing technique, and brightness of the averaged virtual face image. The distribution is represented by lightness contours of multiple gradations, and among these lightness contours, the lightness contours of a specific lightness formed around the cheekbone are used as reference contours, and the area surrounded by the reference contours is taken as a reference area, and this reference area and the measurement It is characterized in that the sagging correction effect is evaluated in comparison with the area.

In the first to sixth inventions, since the case where the foundation is used for the virtual face obtained by averaging the face images of a plurality of persons is evaluated, the characteristics of the personal face of the subject are not easily revealed. The effect of the foundation itself becomes easier to understand.
Moreover, since the appearance of the sagging skin is represented by the brightness, the sagging correction effect can be quantified.

In addition, according to the first to third inventions, the degree of sagging can be quantified by the inclination of a specific part of the face, whereby the foundation can be quantitatively evaluated.
According to the fourth to sixth inventions, since the degree of sag can be quantified by the area of the lightness portion above a certain value, the foundation can be quantitatively evaluated.
In particular, in the second and fifth inventions, when a foundation is used, the foundation can be evaluated based on which age the face looks like.

1st Embodiment of this invention is described using FIGS. 1-3.
In the first embodiment, a numerical value based on the inclination direction of the flesh of the specific part in the face image is calculated, thereby evaluating the sagging correction effect of the foundation.
Note that the inclination direction of the specific portion is not actually measured three-dimensionally, but is calculated based on the brightness of the image data. Therefore, the evaluation of the sag correction effect by the foundation can also be determined to have a high correction effect when the change in the brightness of the face image data photographed from the front approaches the brightness of the face image with no actual sag.
And in this 1st Embodiment, the reference value of the sagging state according to age is provided, and the sagging correction effect when using the foundation is evaluated by comparing with this reference value.

For this purpose, an average virtual face image for each age is generated as a reference face using the foundation. This average virtual face image is created as follows.
First, for each age group, the faces of a plurality of people's faces are photographed from the front, and taken as image data into a computer.
At the time of shooting, the distance from the camera, lighting conditions, etc. are fixed and the front of the face is shot.

Multiple images captured by age are averaged using morphing techniques. Various methods can be considered for the averaging procedure. For example, a plurality of face images of the same age group are paired together, and morphing is performed between each set of image data to create an intermediate face image. . Further, morphing is performed between these intermediate face images to create a new intermediate face image. This process is repeated to create one averaged virtual face image, and this virtual face image is used as a face image of an average subject's face (hereinafter referred to as an average face) by age.
The morphing technique is a technique for creating a moving image in which one of two different images is smoothly changed to the other. Here, the average face image is created by regarding an intermediate state in the process of changing the image as an average of both.

Next, the reference value of the slack state by age is specified using the average face image by age.
First, an average face image for each age created as described above is data-processed by a computer, and is expressed by brightness of a plurality of gradations. FIGS. 1A, 1B, and 1C are schematic diagrams of images representing average faces of the 20s, 40s, and 60s, respectively, with brightness of 18 gradations. Among the 18 gradations, a lightness contour line having a specific lightness formed around the cheekbone is defined as a reference contour line L1. Here, the contour line of the second lightness level from the brightest lightness among the 18 gradation levels is used as the reference contour line L1, but the contour line of any gradation level may be used as the reference contour line L1, and the number of gradation levels is 18th floor. Not limited to key.
However, since the cheekbone portion is raised and protrudes forward, the surrounding area is usually high in lightness. Accordingly, the contour line having a relatively high brightness becomes the reference contour line L1.
In FIGS. 1A, 1B, and 1C, several of the 18 gradation lightness contour lines are schematically shown.

  When the reference contour line L1 is determined, a straight line L connecting the lowest end P1 of the reference contour line L1 and the outermost inflated portion P2 outside the paranasal sinuses is specified. This straight line L is specified by a person via a computer screen. Then, an angle θ formed by the straight line L and the horizontal line L0 is measured by a computer, and the result is shown in the graph of FIG. In this graph, the horizontal axis represents age, and the vertical axis represents the angle θ, which is a reference angle curve. In order to create a graph of this reference angle curve, an average face image is created in the 30s and 50s (not shown) in the same manner as described above, and the angle θ in the average face image of each age is measured. Yes. The angle θ corresponding to each age in the reference angle curve is set as a reference angle for each age.

In addition, although what kind of state may be used as a reference value, in this 1st Embodiment, angle (theta) at the time of a bare face is made into a reference angle.
Further, it can be seen from the reference angle curve of FIG. 2 that the angle θ increases as the age increases and decreases with age. This corresponds to the fact that in the actual three-dimensional data, the maximum inclination of the flesh of the face is closer to the vertical direction for younger people and toward the rear as the age increases. Furthermore, when combined with the fact that younger people have less sagging, it is possible to determine the degree of sagging according to which age the angle θ corresponds to.

A procedure for evaluating the sag correction effect of a specific foundation using a reference angle capable of determining the degree of sag will be described.
First, an average face image for each age using the foundation for evaluation is created. From this image, the reference lightness contour line is specified, and the measurement angle θ ′ is measured. The measurement angle θ ′ is an angle specified by the same procedure as the angle θ. In other words, the image shown in FIG. 1 is a diagram in which the average face of the natural face by age is represented by the brightness of 18 gradations, but the average face image using the evaluation target foundation can be similarly represented.

  For example, an average face image is created from a plurality of face images in their 50s using the evaluation target foundation, and the image is expressed with the brightness of 18 gradations shown in FIG. Then, the measurement angle θ ′ is measured in the same manner as the angle θ. The result is placed on the reference angle curve in FIG. 2 to identify the corresponding age. At this time, if the specified age is younger than the 50s, it means that there was a sag correction effect by the above-mentioned evaluation object foundation, and if it is above the 50s, it can be determined that there was no sag correction effect.

As described above, the degree of sagging can be quantified by the measurement angle θ ′ of the average face image using the evaluation target foundation, and as a result, the sagging correction effect of the foundation can be quantitatively evaluated. .
In particular, since the average face created using the morphing technique is used as the face of the subject, for example, personal features such as moles and spots are erased, and the effect of the foundation can be easily determined.

In the above embodiment, the reference angle is determined for each age and the measurement angle θ ′ is compared with the reference angle θ. However, the reference angle may not be set for each age.
For example, even if the average face image is not created for each age, if the measurement angle θ ′ when using different foundations is compared against the average face image based on the same subject, the sagging correction effect for each foundation The degree can also be determined.
However, if a reference angle for each age is set, it will be easier to realize the sag correction effect, for example, by appearing to rejuvenate about 10 years old.

The second embodiment described below is an example in which the foundation is evaluated using a measurement area S ′ having a predetermined brightness near the cheekbone instead of the measurement angle θ ′. The second embodiment will be described with reference to FIGS. 4 to 6. In the second embodiment, the numerical value to be evaluated is different from that of the first embodiment, but the average face image is represented by the brightness of a plurality of gradations. The point of using the image is the same as that in the first embodiment.

Also in the second embodiment, an average face image created using a morphing technique is used as a face using the evaluation target foundation. The method of creating the average face image is the same as that in the first embodiment.
As shown in FIGS. 4A, 4B, and 4C, an image representing an average face image for each age with a plurality of gradations, for example, 18 contour gradations of brightness contours is displayed. 4A, 4 </ b> B, and 4 </ b> C schematically show some of the 18 gradation lightness contour lines.

Next, in the image shown in FIG. 4, a reference contour line L1 around the cheekbone is specified, and an area S surrounded by the reference contour line L1 is calculated. The area S can be calculated by a computer.
Then, the area S obtained from the average face image of the face for each age in FIG. 4 is set as the reference area for each age. The result is shown in the graph of FIG. This graph is a reference area curve with age on the horizontal axis and area S on the vertical axis. Thus, it can be seen that the area S decreases as the age increases. This result means that a face with no sagging has a large bright area when viewed from the front.

Next, an average face image of a specific age group, here 50s, is created using the evaluation target foundation shown in FIG. 6, and the reference contour line L1 is specified also in this average face image, and the reference contour line L1 is used. The enclosed area is defined as a measurement area S ′.
By comparing the measurement area S ′ in the average face image using the evaluation target foundation with the reference area S, the sag correction effect of the evaluation target foundation can be evaluated.
That is, it is possible to specify where the measurement area S ′ is located on the reference area curve in FIG. 5 and which age it corresponds to. The age specified here is an apparent age. If the apparent age is younger than the actual age, it can be evaluated that the sagging correction effect of the foundation has been exhibited.

Moreover, it can also be evaluated which foundation has a large sagging correction effect by comparing the measurement area S ′ when different foundations are used.
As described above, the degree of sagging of the face can be quantitatively evaluated based on the value of the measurement area S ′, and as a result, the sagging correction effect of the foundation can be quantitatively evaluated.

It is a schematic diagram of the image which expressed the average face image of 20's in 1st Embodiment with the brightness of multiple gradations. It is a schematic diagram of the image which represented the average face image of 40's in 1st Embodiment by the brightness of multiple gradations. It is a schematic diagram of the image which represented the average face image of 60's in 1st Embodiment by the brightness of multiple gradations. It is the graph which showed the reference angle curve in a 1st embodiment. It is a schematic diagram of the image which expressed the average face image of 50 generations using the evaluation object foundation in the first embodiment with brightness of a plurality of gradations. It is the schematic diagram of the image which represented the average face image of 20's in 2nd Embodiment by the brightness of multiple gradation. It is a schematic diagram of the image which expressed the average face image of 40's in 2nd Embodiment by the brightness of multiple gradations. It is a schematic diagram of the image which represented the average face image of 60's in 2nd Embodiment by the brightness of multiple gradations. It is the graph which showed the standard area curve in a 2nd embodiment. It is a schematic diagram of the image which expressed the average face image of 50 generations using the evaluation object foundation by the lightness of multiple gradations in 2nd Embodiment.

Explanation of symbols

L1 Reference contour line L0 Horizontal line P1 The lowest end P2 of the reference contour line The most inflated portion outside the paranasal sinus θ Angle θ ′ Measurement angle S Area S ′ Measurement area

Claims (6)

  The face images of multiple people using the foundation to be evaluated are averaged using a morphing technique, and the brightness distribution of the averaged virtual face image is represented by brightness contours of a plurality of gradations. These brightness contour lines Among them, the lightness contour line of a specific lightness formed around the cheekbone is taken as the reference contour line, and the measurement angle formed by the straight line from the lowest jaw position in the jaw direction of this reference contour line to the most inflated part outside the sinus and the horizontal line The foundation evaluation method for evaluating the sagging correction effect.   The face images of multiple people are averaged using morphing techniques for each age, and the brightness distribution of the averaged virtual face image for each age is represented by multi-tone brightness contours. Among them, the lightness contour line of the specific lightness formed around the cheekbone is taken as the reference contour line, and the angle formed by the straight line from the lowest jaw position in the jaw direction of this reference contour line to the most inflated part outside the sinus and the horizontal line is 2. A reference angle is specified by classification for each age, a reference angle for each age is compared with the measurement angle, an age corresponding to the measurement angle is specified, and a sagging correction effect is evaluated. Evaluation method of foundation as described in 1.   Average face images of multiple people using natural faces or specific foundations using morphing technology for each age, and express the brightness distribution of the averaged virtual face image with brightness contours of multiple gradations. Of these lightness contour lines, the lightness contour line of a specific lightness formed around the cheekbone is used as a reference contour line, and a straight line from the lowest end position in the jaw direction of this reference contour line to the most inflated portion outside the sinus and a horizontal line form. The foundation evaluation method according to claim 1, wherein the angle is specified as a reference angle, and the sagging correction effect is evaluated by comparing the reference angle with the measurement angle.   The face images of multiple people using the foundation to be evaluated are averaged using a morphing technique, and the brightness distribution of the averaged virtual face image is represented by brightness contours of a plurality of gradations. These brightness contour lines Among these, a foundation contour evaluation method for evaluating a sag correction effect according to a measurement area surrounded by a reference contour line having a lightness contour line of a specific brightness formed around a cheekbone.   The face images of multiple people are averaged using morphing techniques for each age, and the brightness distribution of the averaged virtual face image for each age is represented by multi-tone brightness contours. Among them, the lightness contours of specific brightness formed around the cheekbones are used as reference contours, the area surrounded by the reference contours is taken as the reference area for each age, and the reference area for each age is compared with the measured area, the slackness The foundation evaluation method according to claim 4, wherein the correction effect is evaluated.   The face images of multiple people using a natural face or a specific foundation are averaged using a morphing technique, and the brightness distribution of the averaged virtual face image is expressed by brightness contours of multiple gradations. A lightness contour line of a specific lightness formed around the cheekbone is used as a reference contour line, an area surrounded by the reference contour line is used as a reference area, and the sagging correction effect is evaluated by comparing the reference area with the measurement area. Item 5. The foundation evaluation method according to Item 4.

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