Method for executing application having improved self-diagnosis accuracy for hair, and self-diagnosis service device for hair by using same

A hair self-diagnosis service device, comprising:

• a smart device including one or more processors, a memory storing instructions, a display, and an input interface;
• and
• a hair self-diagnosis application stored in the memory and executed by the one or more processors to:
• (i) capture, within a facial recognition area of the hair self-diagnosis application, at least one user head image to obtain user head image information including measured depth information and captured hairline information of a user;
• (ii) evaluate the at least one user head image to detect at least one of an angle deviation and an image quality issue in the at least one user head image;
• (iii) automatically determine hair density on a user's head part based on the user head image information;
• (iv) perform at least one of:
• (a) recommending, for user selection, one or more hairlines suitable for the user's facial shape, or (b) receiving, from the user, input that directly sets a hairline;
• (v) provide, on the display, an image of:
• (a) a selected hairline that is selected by the user from the one or more recommended hairlines, or (b) the set hairline;
• (vi) determine a hair-required area based on a difference area between a user hairline and the selected hairline or the set hairline;
• and
• (vii) calculate and provide a required number of hairs according to the hair-required area and the determined hair density;
• wherein the application is further executed to:
• (viii) detect key point information from at least one body part constituting the user's head part to analyze user-customized 3D head data, and
• (ix) identify a virtual facial shape similar to the user by considering at least one of the user's current hair position, race, gender, age, and the at least one user head image, and automatically matching multiple hairline images suitable for the virtual facial shape and recommending the multiple hairline images in an order of ranking to enable the user to select one hairline image from the recommended multiple hairline images.