JPH01250836A - Device and method for analyzing skin surface color tone - Google Patents

Abstract

PURPOSE:To analyze the color tone of a skin surface directly in a short time with high accuracy by irradiating a prescribed position of the skin surface with light rays from all circumferential directions and photographing a color image of the position. CONSTITUTION:The prescribed position on the skin surface is illuminated to obtain its color image by a video camera 10. The color image signal of the skin surface from the video camera 10 is converted by an A/D converter 3 into a display digital signal of the color tone of the skin surface, which is inputted to an information processor 4. Then the color image of the input digital signal is displayed on a CRT display device 7. Then the color image displayed on the display device 7 is observed with the naked eye to specify an optional part of the color image on the screen. Then, the color image signal of the indicated part is analyzed by the information processor 4 which includes a storage means 8 for the digital signal and its arithmetic means, a display means 7 and its control means, and a color image processing unit 6. Consequently, the color tone of the skin surface can be analyzed with high accuracy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a skin surface tone analysis device and an analysis method, and more particularly, to an analysis of the skin surface tone of a human body, an animal, etc., particularly the skin surface tone of a human body. The present invention relates to a skin surface tone analysis device and analysis method for performing evaluation.

(Prior art) Conventionally, in order to examine the surface condition of the skin, it has been carried out to irradiate light from the direction (1) and observe its properties (for example, Japanese Patent Laid-Open No. 60-198130, Japanese Utility Model Publication No. 62) −
24271), and in order to obtain a clear image of the skin surface, a replica of the skin surface is created.
C5URFi.

EX-F (Menshi Dental Industry Co., Ltd.) transfers an uneven image of the skin surface onto an opaque material and magnifies it using a stereoscopic microscope, etc., and also attaches a video camera, A-D converter, and information processing equipment to the microscope. The surface morphology of the skin has been analyzed by applying
0-53121).

[Problem to be solved by the invention]

However, when using the former method described above, the skin surface of yellow and white people is highly transparent, so it is difficult to uniformly and clearly observe, detect, and analyze the skin grooves running on the skin surface. In the case of the latter method, since it is indirect observation via a replica, it lacks accuracy, requires time and effort to create a replica, and has problems such as causing discomfort and anger to the subject when creating the replica.

In addition, in selecting cosmetics that are suitable for the skin surface and cosmetic purpose, it is important to understand the color tone of the skin surface as accurately as possible, but the above method can also be used to measure the properties of the skin surface. With the aforementioned problematic means, it has been more difficult to measure the tone of the skin surface.

That is, when using the former method described above, if there are moles, spots, or hair on the area to be measured, the skin tone will be affected by those tones, making the measurement of the height and tone inaccurate, and also due to light Since the irradiation is unidirectional, there are problems such as poor reproducibility of imaging. Furthermore, when using the latter method described above, it is virtually impossible to measure the color tone of the skin surface.

In addition, there is a method of measuring the color tone of the skin surface using a color difference meter.The method of using a color difference meter is to determine the skin surface area to be measured with the naked eye, press the detection area directly against the skin, and measure the color tone. Therefore, it is impossible to select minute areas on the skin surface and selectively measure the color tone of a desired area, and the accuracy is low.

Therefore, an object of the present invention is to provide a skin surface tone analysis device and an analysis method that solve the problem of making it possible to directly measure the tone of the skin surface with high precision and in a short time.

[Means for Solving the Problems] As a result of various studies to achieve the above object, the present inventors irradiated light onto a predetermined area on the skin surface from all around the area and converted the image into a color 1 darkest image. Then, by converting the color image signal into a digital signal using an A-D converter and observing this digital signal via an information processing device,
It has been found that it is now possible to measure the skin surface color tone of a desired area by excluding areas that are recognized to have an adverse effect on the measurement of the true skin surface color tone, and as a result, the above-mentioned problems can be solved.

The present invention has been made based on the above findings, and includes a ring-shaped illumination device that illuminates a predetermined part of the skin surface from all directions, and a high-performance imaging device that takes color images of the skin surface illuminated by the ring-shaped illumination device. a digital signal generating device that converts a color image signal of the skin surface from a cough field imaging device into a digital signal, and a storage means for the digital signal;
The present invention provides a skin surface tone analysis device comprising an information processing device including a calculation means, a display means, and a control means therefor.

In addition, the present invention provides a preferred analysis method using the skin surface color tone analysis device, in which a predetermined region of the skin surface is illuminated, and the illuminated skin surface is photographed in color by an imaging device.
A color image signal of the skin surface from the imaging device is converted into a digital signal representing the color tone of the skin surface by a digital signal generator and inputted to an information processing device, and a color image of the input digital signal is displayed on a CRT display device. After that, the CRT
By observing the color image displayed on the display device with the naked eye, any part of the color image is designated on the screen, and the color image signal of the designated part is transmitted to the digital signal storage means, its calculation means, and the like. The present invention provides a method for analyzing skin surface tone using the above-mentioned information processing device including display means and control means thereof.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, embodiments of the skin surface tone analysis device of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an overview of an embodiment of the present invention together with its usage, FIG. 2 is a perspective view showing an example of the ring-shaped lighting device, and FIG. 3 is a block diagram showing an example of the ring-shaped lighting device. 1 is a partially cutaway side view of an example of a video camera that is an example of an imaging device; FIG.

In FIG. 1, numeral 10 is a video camera (color three-tube type or three-panel type) equipped with a ring-shaped illumination device 1 and a magnifying objective lens system 11. It is arranged so that it can be irradiated from all directions, and the illuminated skin surface image is magnified by a magnifying objective lens system 11 and then photographed in color by a video camera IO.

Further, 2 is a negative/positive inverter, 3 is an A-D converter that constitutes a digital signal generator, and 4 is an information processing device.
The negative/positive inverter 2 can clarify skin grooves and the like by inverting the image signal from the video camera 10 as needed, but the negative/positive inverter 2 is usually not required when measuring the color tone of the skin surface. Therefore, normally, the image signal from the video camera 1O is input into the information processing device 4 after being converted into a digital signal by the A-D converter 3 without being inverted.

Further, the image signal is not so that it can be displayed on the television monitor 5 without being reversed or after being reversed, if necessary.

The information processing device 4 is equipped with a color image processing unit 6 including a storage means 8 for the digital signal, a calculation means thereof, a display means (CR7 display device 7), and a control means thereof. The above-mentioned digital signal image can be observed with the naked eye on a CR7 display device 7, and by specifying any part on the skin surface on the screen, the digital signal image within the specified range is displayed in three colors ( R2
O, B, ), the intensity of each reflected light can be calculated, and the color tone of the skin surface can be measured. At this time, the signal input to the information processing device 4 or the signal after calculation is stored in an external memory 8 so that it can be compared with other skin surface images as necessary. Print the image displayed on 7 to printer 9.
It is now possible to print. By making the CR7 display device 7 capable of displaying, for example, a quadrant image, it is possible to easily and accurately compare images of different skin surfaces, for example images of skin surfaces of women of different ages.

The ring-shaped illumination device 1 used in the above embodiment will be explained together with the video camera IO equipped with the ring-shaped illumination device 1. As shown in FIG.
A bundle of optical fibers g is inserted into the circular optical fiber insert 12, and each optical fiber g constituting the bundle of optical fibers is inserted into the insert 12 so that its tip faces toward the center of the insert 12. The bundle of optical fibers g is exposed in an annular groove 13 continuously provided on the inner surface as shown in FIG.
It is led out through the tube T and communicates with the light source. Reference numeral 14 denotes a light-guiding cylindrical body attached to the distal end of the video camera 10 (upper and lower ends in FIG. 3) with a magnifying objective lens system 11 interposed therebetween; It is an injection molded product made of transparent acrylic resin whose height is designed so that the lower end surface position becomes the focal point depending on the magnification of system 11, etc., and the lower end has a collar on the outside and the center on the inside. A tapered light guide section 15 that becomes thinner toward the center is integrally provided, and the center portion thereof is an observation hole section 16 having a constant diameter.

As the magnifying objective lens system 11, one that can be magnified to an appropriate size that makes it easy to analyze the color tone of the skin surface is selected and used depending on the skin surface, and when the observation hole 16 is brought into contact with the skin surface. It is screwed into the upper end opening of the cylindrical body 14 so that the skin surface is in focus, and the focus can be adjusted as necessary.

The ring-shaped illumination device l is fitted onto the flange of the cylindrical body 14 and fixed with screws or the like as necessary, and the light emitted from the optical fiber g is emitted from the light guide section 1 in the figure, for example.
As shown by the arrow in 5, the light travels toward the center while repeating reflection inside and reaches the observation hole 16.
The skin surface in contact with 6 is illuminated from all around the skin surface.

Further, it is preferable that the ring-shaped illumination device 1 sets its irradiation angle at a high angle with respect to the skin surface, that is, 30 to 90 degrees.

The light source is not particularly limited, and for example, a 30W halogen lamp, a xenon 1 tungsten lamp, etc. with a color temperature of 3000° may be used. Also,
The optical fiber g is also not limited by its diameter or bundle size; for example, a diameter of 50μ is approximately 5III1.
A bundle of 1 is used. Further, the magnifying objective lens system II has a long depth of focus so that the focal point is located on the skin surface, and preferably has a magnification of 60 to 400 times.

Further, the ring-shaped illumination device W1 used in the present invention is not limited to its shape, structure, etc., as long as it can illuminate a predetermined part of the skin surface from the entire circumferential direction. The ring-shaped lighting device shown in FIG. To explain this, the ring-shaped illumination device 1 is attached over the entire length to the outer periphery of the cylindrical main body tube of the video camera 10, and the optical fiber g extends toward the lower end of the ring-shaped illumination device 1, and the lower end thereof is connected to the video camera 10. The optical fiber g is sandwiched and disposed so as to form a circumferential shape coaxial with the optical axis of 10 and the direction of the optical fiber g is in the same direction as the optical axis, thereby forming a circular light irradiation tip.

Further, a ring-shaped lens 20 is provided near the front surface of the irradiation tip of the optical fiber g of the ring-shaped illumination device 1. This ring-shaped lens 20 has an annular overall shape and a circular cross-sectional diameter, and the radius r of the circle formed by connecting the centers of the circular cross-sections is equal to the radius r for the irradiation tip of the optical fiber g, and the cross-sectional circle is circular. Since the ring-shaped illumination device 1 is arranged in series with a distance of 2/3 of the radius from the irradiation tip, the light emitted from the ring-shaped illumination device 1 passes through the ring-shaped lens 20 and is condensed into a cylindrical surface. None.

In addition, in front of the ring-shaped lens 20 (top, bottom of the figure),
A holding frame 21 of a ring-shaped lens 20 having a conical mirror surface whose inner surface forms an angle of 45° in the optical axis direction is screwed onto the lower end of the ring-shaped illumination device 1, and the holding frame 21 of the ring-shaped lens 20 is screwed to the lower end of the ring-shaped illumination device 1. is reflected on the mirror surface and deflected in the horizontal direction. Further, the reflected light is reflected again at the conical outer surface having an angle of 55° with respect to the optical axis of the frame holding the magnifying objective lens system 11 of the video camera 10, and is reflected again into the observation hole 16 shown by a small circle. , so that the cough hole portion 16 can be illuminated uniformly and with high illuminance from the entire circumferential direction forming an angle of 20° from the optical axis. Incidentally, the optical path of the light emitted in the optical axis direction among the components of the light diffused and irradiated from the optical fiber g is shown by a dashed-dotted line.

Further, 22 is a spacer screwed onto the side surface of the holding frame 21, and its lower end face is positioned at the same distance as the field of view.

Next, referring to FIG. 1, a description will be given of a case in which a preferred embodiment of the analysis method of the present invention using the apparatus of the embodiment shown in FIGS. 1 to 3 is applied to the analysis of the color tone of the skin surface of a human body. do.

First, the observation hole 16 of the video camera 10 is brought into contact with the skin surface to be analyzed, as shown in FIG. . As a result, the irradiated light passes through the light guide section 15 and illuminates the skin surface from all directions. The illuminated skin surface image is then magnified by a magnifying objective lens system 11 and then captured by a video camera 10.

Next, the color image signal of the skin surface captured by the video camera 10 is converted into a digital signal by the A-D converter 3 and then input to the information processing device 4 . At this time, by displaying the image signal from the video camera 10 on the television monitor 5 as necessary, it is possible to change the area of the skin surface to be analyzed and to adjust the focus.

Then, the image of the digital signal inputted to the information processing device 4 is observed with the naked eye using the CRT display device 7, and the naked eye observation reveals areas that are judged to have an adverse effect on the measurement of the color tone of the skin surface, such as moles and other areas. Areas such as areas with thick hair (measurement excluded areas) are excluded, and the color tone of areas other than the measurement excluded areas is measured through the information processing device 4.

The preferred embodiments of the above measurement method will be detailed as follows:
The range of the skin surface to be measured is displayed in the center of the screen of the CR7 display device 7 (preferably displayed at a magnification of 30 to 500 times), and the range of the skin surface to be measured is 10 to 1,024 (horizontal direction) x 10 to 1 in the center of the screen. .024 (horizontal) places (10s~10
Excluding the measurement of the above-mentioned measurement-excluded parts (partitions), the images of other parts (partitions) are divided into three components of RGB, and the intensity of each spectral component in each division is calculated. The intensity of the reflected light of each spectral component is calculated by averaging these measured values, and the color tone of the skin surface is measured based on the measured values of the calculated intensities of the three components.

Note that the image processing unit 6 of the information processing device 4 has the following functions: designation of areas to be excluded from measurement through naked eye observation, spectral operation of three components,
The data necessary for measuring the intensity of reflected light of each spectral component in each section other than the measurement excluded area and calculating the average value is input, and the above color tone measurement operation is performed using these data. It is something that can be done. In addition, the measurement of the spectral intensity of each section above is usually performed by dividing each intensity into 64 to 1.024 steps, for example 256 steps (the larger the number, the higher the intensity), and the average value of each section is used to measure the intensity. It is convenient to indicate the following. And when divided into 256 stages,
R for each section that is white, black, red, green, and blue
, G, B, values are expressed as follows.

White → (R, G, B,) = (255, 255, 25
5') Black = (R, G, B,) - (0,0,0) Red =
(RoG, B,) = (255,0,0) Green = (R
oG, B, ) = (0,255,0) blue − (R,G
, B, )=(0,0,255) Next, the effects of the skin surface tone analysis method of the present invention using the skin surface tone analyzer of the present invention will be specifically explained using test examples.

[Test example]

Using the skin surface tone analyzer of the present invention shown in FIGS. 1 to 3, the color tone of a male cheek surface was measured under the following conditions.

Measurement magnification: 200x (on a 14 inch CRT).

Irradiation angle: 60 degrees to the camera optical axis.

Measurement range: 320 at the center of the screen of CR7 display device 7
Measured at 200 locations (64,000 sections).

Measurement method: (1) 64 displayed in the center of the screen of a CRT display device
Of the 000 sections, measurements were taken excluding the areas with whiskers (6400 sections in total), and the following results were obtained.

(R,a,B,)-(211,160,109)(2)
All 64,000 sections were measured and the following results were obtained.

(RoG. Each of the three components was classified into 256 levels, and the intensity of each of the three components in the measured sections was averaged and used as the intensity of the reflected light of each component.

From the above results, it can be seen that the measured value in (1) above moves in the red or white direction when compared with the measured value in (2) above. This is considered to be because when using the method (2) above, since the black component of the beard is also included in the measurement, the measured value is shifted toward black due to the influence of the beard.

(Effects of the Invention) According to the skin surface tone analysis device of the present invention, it is possible to directly measure the tone of the skin surface with high precision and in a short time without being influenced by parts other than the skin.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an overview of an embodiment of the device of the present invention together with an embodiment of the method of the present invention, FIG. 2 is a perspective view showing an example of the ring-shaped illumination device, and FIG. FIG. 4 is a partially cutaway side view showing an example of a video camera equipped with an illumination device, and FIG. 4 is a longitudinal sectional view showing a main part of another example of a video camera equipped with a ring-shaped illumination device. 1... Ring-shaped illumination device 2... Negative/positive inverter 3... A-D converter 4... Information processing device 5... Television monitor 6... Color image processing unit 7... CRT display Device 8...External memory 9...Printer 10...Color video camera 11...Enlarged objective lens system 12...Optical fiber insertion body 13...Annular groove 14...Cylindrical body 15...Light guide section 16...Observation hole L...Light source Fig. 2 Fig. 4

Claims (3)

[Claims] (1) A ring-shaped illumination device that illuminates a predetermined area of the skin surface from all around it, an imaging device that takes color images of the skin surface illuminated by the ring-shaped illumination device, and a color image signal of the skin surface from the imaging device A skin surface tone analysis device comprising: a digital signal generating device that converts a digital signal into a digital signal representing the tone of the skin surface; and an information processing device including a storage means for the digital signal, a calculation means for the digital signal, a display means for the digital signal, and a control means for the digital signal. (2) The skin surface color tone analysis device according to claim (1), wherein the irradiation angle of the ring-shaped illumination device is 30 to 90 degrees with respect to the skin surface. (3) A predetermined area on the skin surface is illuminated, the illuminated skin surface is photographed in color by an imaging device, and the color image signal of the skin surface from the imaging device is converted into a digital signal representing the color tone of the skin surface by a digital signal generator. and input the color image of the input digital signal into the information processing device as C.
After the color image is displayed on the RT display device, by observing the color image displayed on the CRT display device with the naked eye, any part of the color image is specified on the screen, and the color image signal of the specified part is transferred to the digital A method for analyzing skin surface tone using the above-mentioned information processing device including a signal storage means, a calculation means thereof, a display means thereof, and a control means thereof.