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:
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.