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Skin Measurement

A comprehensive portfolio of skin diagnostic system from Chowis is designed to capture information and give intelligence for better decision based on its analysis result on up to 11 areas;​

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The dead skin layer becomes thicker if the amount of moisture on the skin surface is low, and its elasticity and vitality decreased, if not cared for properly. Skin also becomes roughen and dark, which are the signs of skin aging.

It is to measure the amount of moisture on the skin surface, contact the moisture sensor to the skin surface and measure the changes of the capacitance of the precision capacitor, which differs depending on the moisture distribution.



Sebum is covered by the sebaceous gland and connected to the pore. It plays a role as a natural moisturizing cream mixed with sweat in order to prevent excessive loss of moisture. Proper sebum, therefore, is necessary to make facial skin moisturized and to keep skin healthy as it contains mineral water, the nutrition of resident virus who eats extra impurities on our skin.

The sebum tape images and result of detected images:


Sebum smeared in oil paper changes the color of paper to stronger scarlet than the original, therefore, we calculate the value using the color difference of the red areas.



The excess oil results from the sebaceous glands in the skin producing the sebum. Those who have this condition usually have shiny skin and large pores.

The captured oiliness images and result of detected images:


The detected oiliness region of greater gray intensity value than other regions detected by using the cross mask. The detected region is selected with top 2% brightness pixels.



The pore is tiny little openings on the layer of the skin where the sebaceous glands are produced by the body’s natural oil. Size of the pore may look bigger when; 1) amount of sebum on skin surface secreting from sebaceous glands connected with hair follicle increases, 2) sebum and impurities are piled up inside of pore, or 3) pore wall becomes sagged and stretched by the decrease of elasticity due to skin aging.

The captured pore images and result of detected images:

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When it comes to the brightness of the image, pore looks relatively darker than surroundings and has the round shape. First, the dark area is detected, then body hair (similar dark part) is removed from the detected region. Morphology opening method is used in order to separate detected pore which is small, sagged or connected. Since depth and size are important for the value of the pore, the pore index is calculated by multiplying the two values and then dividing it by the size of the image per each pixel.



Wrinkles are creases, folds, or ridges in the skin. Through exposure to ultraviolet rays, the elasticity of the skin is impoverished or elastin and collagen are degenerated, which makes skin dry and leads to an increase of wrinkle. (Hyaluronan has a strong nature to absorb water and it volumes up to several times if the water is kept. On the other hand, however, if the water is lost, its bulk decreases with the ratio of square root, cube root, and then wrinkle is created naturally on the skin).

The captured wrinkle images and result of detected images:

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Like pore, a wrinkle also looks relatively darker than surrounding areas. So the dark area is first detected and then body hair is removed in a similar way. As the significant components for the wrinkle are length and depth, it is considered as wrinkle only if a length is more than a fixed value. Value of S channel of HLS color space which is similar to real depth is used. For each area finally defined as wrinkle, the length of wrinkle multiplies the average depth value, and the wrinkle index is calculated by dividing it image size value.



Through exposure to ultraviolet rays, the elasticity of the skin is impoverished or elastin and collagen are degenerated, which makes skin dry and leads to an increase of wrinkle.

The captured fine wrinkle images and of detected images



The skin may look darker when melanin pigment is excessively produced or lighter when less produced. This is called “pigmentation” and caused by ultraviolet rays, skin infections or scars.

The captured pigmentation images and result of detected images:


The darker region is detected by brightness value. Through detection process, only the melanin region (brown) is left. Body hair region is also detected and removed from the melanin region. The numerical value for pigmentation is computed by brightness value. It gives its first weighted value based on the degree of darkness and second weighted value on the degree of darkness against surrounding. The spot index is calculated by combining the two and then dividing it by image size value.



From sunburn to an allergic reaction, there are many situations in which your skin can become red or irritated. It may be because extra blood rushes to the skin’s surface to fight off irritants and encourage healing. Skin redness can also come from exertion, such as after a heart-pounding exercise session.

The captured redness images and result of detected images:


The redness region is detected by color difference method.
The detected region’s intensity value is different from the surroundings in R and G color channel of RGB image. The redness index is calculated by the difference of two color channels and combination of constant value and then dividing it by image size value.


Porphyrin is the substance created by the acne virus, the main reason for acne. It is indicated as scarlet orange light in response to a specific wavelength range of UV light. The degree of skin disease such as acne can be analyzed by measuring the amount of Porphyrin.

The captured porphyrin images and result of detected images:




There are two types of acne; porphyrin seen as scarlet color and clogged pore seen as halfway between yellow and green color. These can be analyzed separately, but we combine and classify them as acne. We detect porphyrin and clogged pore jointly, and the index is computed by percentage against image size.



Keratin is a class of fibrous proteins, and your outer layer of skin is mainly composed of this protein. Sometimes your body malfunctions when producing this protein, and it builds up under a hair follicle near the top layer of skin; it then produces a plug that rises to the surface. These plugs manifest as small, rough dots, often white or red, and the condition is called keratosis pilaris.

The captured Keratin images and result of detected images:


Making use of keratin tape on the skin’s surface, dead skin cells are detected and measured based on the amount of keratin captured on the image from the tape

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