KR20230026217A - Nail measurement system capable of measuring curvature of nail curvature - Google Patents

Abstract

The present invention relates to a nail measuring system, comprising: a receiving part for receiving a bird's eye view image, a side view image, or a front view image as a nail image captured for a nail; an object recognizing part recognizing individual nails from a plurality of the nail images; a size measuring part measuring a size of a cross-section of the nail in the bird's eye view image; a curvature calculation part calculating a curvature of a curved surface of the nail using the front view image and the side view image; and an image generation part for generating a 3D nail image for a curved nail by synthesizing calculation results of the size measuring part and the curvature calculation part, thereby capable of measuring customized nails optimized for each user.

Description

Nail measurement system capable of measuring the curvature of the nail surface

The present invention relates to a nail measuring system capable of measuring a three-dimensional shape of a nail.

Nail art is to decorate fingernails or toenails, and has been developed in various forms. In the past, nail polish, gel nails, etc. were mostly applied directly to the nail. Manicure, gel nails, etc. are made of synthetic resin or UV-curable resin, and there is a problem in that nails are damaged, weakened, and cracked when they are in direct contact with nails for a long time. In addition, acetone is used when removing them from the nails, but frequent use weakens the nails and is a problem. In addition, gel nails have a property of curing in response to ultraviolet rays. Therefore, gel nails must go through a curing process through ultraviolet rays or LED lamps. In this process, it is exposed to strong ultraviolet rays, and strong ultraviolet rays can cause rapid aging, causing skin wrinkles or skin cancer. Also, in the process of removing gel nails, nails and skin may be stimulated and the nails may be damaged.

In recent years, nail stickers attached to fingernails or toenails in the form of stickers have been developed and used. The nail sticker is easy to attach to or remove from the nail, and does not irritate the nail or skin during the attachment or removal process. In addition, since compounds such as synthetic resins or UV-curable resins do not come into direct contact with the skin, they have less effect on the skin than when nail polish or the like is applied directly.

On the other hand, since the conventional manicure is applied directly to the shape of the user's nail, it is automatically applied to the size and shape of the nail during the application process, so a separate user optimization process is unnecessary. However, in the case of nail stickers, they are produced and sold in a certain size from the manufacturing stage. Therefore, it has a limitation that it cannot be optimized for the size of each user's fingernail.

Nail stickers are made to the size of a normal nail, but users who have smaller nails than the nail stickers on sale should cut both sides and top of the nail. This cumbersome process causes the advantage of nail stickers to simply decorate nails by half. On the other hand, if the user's nails are larger than the manufactured nail sticker, the nail sticker cannot cover the whole body of the nail, so it may be impossible to use, which is more problematic.

Accordingly, recently, a technique for providing individual nail stickers suitable for user's nails has been disclosed. Related prior art Korea Patent Registration No. 10-1669994 (hereinafter referred to as 'prior patent') is a background image desired by overlapping a background image on a user's nail image as an image in producing a nail decoration attachment. A method of generating and providing a nail decoration attachment according to a user's choice after checking an image when it is attached to an actual nail in advance and checking it is disclosed. In particular, the prior patent discloses that a difference between a sectional background image and a distorted background image curvedly attached to an actual nail can be confirmed by distorting the background image to correspond to the curved shape of the nail.

However, while the prior patent discloses that the background image can be distorted to correspond to the curved shape of the nail, it does not describe a specific method for substantially measuring the degree of curvature of the nail. The prior patent only discloses that 'the background image is curved and deformed with a certain curvature on both sides'.

Since the nail forms a substantially curved surface, the curvature of the curved surface as well as the horizontal or vertical length of the two-dimensional cross section should be considered. That is, even if the horizontal width is the same in terms of cross-section, the horizontal length (the length of the arc between both sides) may be different depending on how much the ton is bent (curved). Therefore, for this reason, even when nails have the same horizontal width and the same nail sticker is used, there may be a problem in that both sides are insufficient due to different curves of the nails. However, the prior patents do not reflect the specific three-dimensional curved shape of the nail.

Accordingly, the present applicant has conducted research and development on a specific method capable of measuring the degree of curvature of the curved surface of each individual nail in measuring the user's fingernail. Therefore, it was confirmed that the present invention can measure the characteristics of the user's nails three-dimensionally and create a nail decoration through this, thereby providing a more customized product than the nail decoration attachment created in the prior patent.

Korean Patent Registration No. 10-1669994

An object of the present invention is to provide a nail measurement system capable of accurately measuring different nail shapes for each individual user by calculating the curvature of the nail surface in consideration of the curved shape of the nail as well as the length of the cross section of the nail.

In addition, the present invention is to provide a nail decoration generating system capable of generating a user-customized nail decoration by measuring the nail shape of an individual user in generating a nail decoration.

The problems to be solved by the present invention are not limited to the problems mentioned above. Other problems and advantages of the present invention will be more clearly understood from the description below.

In order to achieve the above object, the present invention provides a nail image captured for a nail, including a receiver for receiving a bird's eye view, side view or front view image; an object recognizing unit recognizing individual nails from the plurality of nail images; a size measuring unit measuring a size of a cross-section of a nail in the bird's eye view image; a curvature calculation unit calculating a curvature of a curved surface of the nail using the front view image and the side view image; and an image generating unit generating a 3D nail image of a curved nail by synthesizing the calculation results of the size measuring unit and the curvature calculating unit, so that the curvature of the curved surface of the nail can be measured.

Preferably, in the nail image, a background card indicating a reference length for measuring the size of the nail and the nail are photographed together, and the background card may be used when measuring the size of the nail in the size measuring unit.

Preferably, it may further include a capture angle analyzer for analyzing a capture angle at which the nail image is captured.

Preferably, the photographing angle analyzer analyzes a photographing angle at which the bird's eye view image is photographed with respect to the bird's eye view image based on a vertical direction of the ground where the nail is located, and for the side view image, the nail body ), it is possible to analyze the shooting angle at which the side view image was taken based on the central part.

Preferably, the curvature calculation unit includes: a front measurement unit for measuring a curvature value of both sides of the nail in the front view image; and a side measuring unit for measuring the curvature value of the nail body in the longitudinal direction or the height between the central portion and the side portion of the nail body in the side view, so that the curvature of the curved surface of the nail body can be calculated.

Preferably, the size measurement unit measures the width, height (height) of the two-dimensional nail section in the bird's eye view image, or the length of an arc of the nail boundary line, and the calculation result of the curvature calculation unit is measured by the size measurement unit. The method may further include a length correcting unit that calculates the length of the curved surface of the nail by correcting the size by reflecting the size to the size.

Preferably, a storage unit may be further included to classify and store the 3D image generated by the image generation unit according to the user or each fingernail.

In addition, in order to achieve the above object, the present invention is a nail image of a user's nail taken from the ground, side, or front, and an image receiving unit for receiving a bird's eye view, side view, or front view image; an analysis unit generating a 3D nail image of a user's nail through the nail image; and a nail image generation unit generating a 3D nail image by combining a decoration image pre-selected by a user with the 3D nail image, wherein the analysis unit includes an object recognition unit recognizing individual nails from the bird's eye view, side view, or front view image. ; a size measuring unit measuring a size of a cross-section of a nail in the bird's eye view image; a curvature calculator calculating a curvature of a curved surface of a nail using the front view image and the side view image; and an image generating unit generating a 3D nail image for a curved nail by integrating calculation results of the size measuring unit and the curvature calculating unit, so that a user-customized nail image can be created.

According to the present invention, in measuring a user's fingernail, it is possible to measure the fingernail three-dimensionally by calculating the curvature of the curved surface of the nail in consideration of not only the size and shape of each user's nail, but also the curved surface of the fingernail. do. Through this, each user's fingernails can be accurately measured.

In particular, the present invention can be used to create a nail decoration that is attached on the nail to decorate the nail in a size suitable for each user. The nail ornament is attached to the entire area of the nail. At this time, even if the nail has the same cross-section length, the total length of the actual nail may be different depending on the degree of bending. Accordingly, the present invention has the advantage of providing a more optimized nail decoration to the user by creating a nail decoration in consideration of the curved surface of the nail.

1 shows a configuration diagram of a nail decoration generating system according to an embodiment of the present invention.
2 shows a configuration diagram of a nail measurement system according to an embodiment of the present invention.
3 shows a state in which a fingernail is recognized by an object recognizing unit according to an embodiment of the present invention.
4 shows a state in which the curvature of a nail is calculated by the curvature calculation unit according to an embodiment of the present invention.
5 is a state in which a 3D nail image suitable for the user's nail is generated and applied to the user's nail through the results measured and calculated by the size measurement unit and the curvature calculator.

Hereinafter, the present invention will be described in detail with reference to the contents described in the accompanying drawings. However, the present invention is not limited or limited by exemplary embodiments. The same reference numerals in each figure indicate members performing substantially the same function.

The objects and effects of the present invention can be naturally understood or more clearly understood by the following description, and the objects and effects of the present invention are not limited only by the following description. In addition, in describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

1 shows a configuration diagram of a nail decoration generating system 1 according to an embodiment of the present invention.

The nail decoration creation system 1 may measure the three-dimensional shape of each nail and create a nail decoration to fit the measured nail shape in generating a decoration attached to the nail and decorating the nail called nail art. The nail decoration generating system 1 may measure the nails and generate the nail decorations, and at this time, the nail decorations may be individually created for each nail. In addition, it will be understood that the nail decoration generating system 1 can also be applied to measurement of toenails and creation of toenail decorations. The nail decorations generated by the system for creating nail decorations 1 may be in the form of stickers attached to nails, but are not limited thereto.

On the other hand, a human fingernail is not a flat cross section but a curved shape forming a curve. At this time, the bends may be largely formed in the horizontal direction and the vertical direction (longitudinal direction). Therefore, the nail decoration production system 1 of the present invention is characterized by measuring the shape of the nail in three dimensions in consideration of the curved surface of the nail. Hereinafter, with reference to the fingernail of FIG. 4A, a horizontal curvature is referred to as a transverse curvature, and a vertical curvature is referred to as a longitudinal curvature, and will be described below.

The nail decoration generating system 1 may include an image receiving unit 10 , an analyzing unit 30 and a nail image generating unit 50 .

The image receiving unit 10 may receive a bird's eye view, a side view, or a front view image as a nail image of the user's nail photographed from the ground, side, or front. The nail image can be measured from multiple angles to determine the three-dimensional shape of the nail.

A bird's-eye view image of the nail is an image of a nail body (nail plate) connected to the back of the hand in a state where the back of the hand is placed facing upward, as shown in FIG. 3A below. It can be understood that the bird's eye view image is a photograph of a surface to which a nail decoration created in the nail decoration generating system 1 is attached. The bird's eye view image may be used to measure the horizontal or vertical size of the nail in the size measurement unit 340 of the analysis unit 30 .

As shown in FIG. 4C , the side view image of the nail may be an image captured from both sides of the nail. Accordingly, the side view images may be two for each nail since both sides are captured. The nail may form a curved surface that is curved on both sides with the central portion of the large area as the center. However, at this time, the degree of curvature of both sides is not symmetrical and may be different from each other. As the degree of curvature is different on both sides of the nail, the height from the lateral end of the nail in contact with the skin (nail wall) fixing both sides of the nail to the central portion of the nail body may be different. More specifically, if the nail has no transverse flexion, the nail is in a flat shape. On the other hand, if the nail has a large degree of transverse curvature, both sides of the nail become more curled into the inside of the nail than in a flat nail, which creates a height difference between the side and center of the nail when viewed from the side. Therefore, in measuring the curvature of the curved surface of the nail in the analyzer 30, all of the side view images taken from both sides of the nail may be used.

In addition, the nail is bent vertically to form a vertical bend. That is, from the nail root (nail root) or the cuticle position where the nail and the finger are connected to the nail body (free edge), a curved line may be formed instead of a flat straight line. Accordingly, the side view image may include a shape in which the nail body is convex upward by being photographed from the side of the nail, and this curve may be used by the curvature calculation unit 30 to calculate the three-dimensional shape of the nail.

As shown in FIG. 4B , the front view image of the nail may be an image taken from a frontal angle of the tip of the nail. The front view image can be used to measure the degree of curvature of the transverse curvature of the curved surface of the nail. The side view image and the front view image may be used as complementary data for measuring the curvature of the nail transverse curvature in the curvature calculator 3503. That is, since the front view image can measure the degree of curvature of the nail to both sides from the front of the nail, and the side view image measures the height between the side of the nail and the central part of the nail body, the width of the nail measured in the front view image A more accurate curvature can be calculated by reflecting the height information in the curvature of the curve.

The analyzer 30 may generate a 3D nail image of the user's nails through a bird's eye view, side view, or front view image. The analysis unit 30 may measure the size of the nail body with a bird's eye view image, calculate the curved curvature of the nail, and analyze the three-dimensional shape of the nail. Here, the dimension is the size of the nail and may include the horizontal length or vertical length of the nail body. The analyzer 30 may perform a function similar to that of the nail measuring system 30 in FIG. 2 . A detailed description of the analyzer 30 will be described later with reference to FIG. 2 .

The nail image generating unit 50 may generate a 3D nail image by combining a decoration image previously selected by the user with the 3D nail image. Although not shown in FIG. 1 , the nail decoration creation system 1 may provide a plurality of decorative images to be applied to the nail decoration to the user. The user may select a decoration image to be applied to his or her nail decoration from among a plurality of decoration images. Information on the decorative image previously selected by the user may be transmitted to the nail image generator 50 and reflected in the 3D nail image generated by the analyzer 30 . Therefore, the nail decoration creation system 1 generates a three-dimensional shape of the nail in the analysis unit 30 through the multi-angle nail image received by the image receiving unit 10, and generates a decorative image selected in the nail image creation unit 50. By applying it, it is possible to create a customized nail decoration suitable for each user's individual nails.

2 shows a configuration diagram of a nail measurement system 30 according to an embodiment of the present invention.

The nail measurement system 30 may perform a function similar to that of the analyzer 30 of the nail decoration generating system 1 in FIG. 1 . Therefore, the nail measuring system 30 of the present invention is characterized in that it can accurately measure the user's individual nails in a three-dimensional shape, so that the nail measuring system 30 can be used to create a user-customized nail decoration can be understood

The nail measurement system 30 includes a receiving unit 310, an object recognition unit 320, a photographing angle analysis unit 330, a size measurement unit 340, a curvature calculation unit 350, a length correction unit 360, and an image generation unit. A unit 370 and a storage unit 380 may be included.

The receiving unit 310 may receive a bird's eye view, side view, or front view image of the nail. The receiving unit 310 may receive a bird's eye view, side view, or front view image received by the image receiving unit 10, and may use it to generate a 3D nail image.

The bird's eye view, side view, or front view image received by the receiving unit 310 is an image of a hand including nails, and may be an image of each nail individually or a plurality of nails together. The bird's eye view, side view, or front view image may be captured against a background that can be distinguished from nails or hands in different colors.

In addition, a background card with nails may be photographed in a bird's eye view, side view, or front view image. The background card may display a reference length for measuring the size of a nail. The standard length displayed on the background card is not fixed and may be set differently according to a user's setting. Referring to FIGS. 3A to 3C , the background card may have a rectangular shape, and the nail may be clearly distinguished from other backgrounds outside the background card by being photographed together with the nail under the fingernail or fingernail. The background card may be used to measure the horizontal width or vertical length of the nail when measuring the size of the nail in the size measuring unit 340 .

The object recognition unit 320 may recognize individual nails from a bird's eye view, side view, or front view image. The object recognizing unit 320 may firstly recognize a background card in a bird's eye view, side view, or front view image captured with the background card, and narrow the recognition range. After that, the object recognizing unit 320 may secondarily recognize individual nails within the boundary range of the background card. At this time, the object recognition unit 320 may perform deep learning object recognition learning for the nail shape in advance and store the learning result. The object recognition unit 320 may recognize a nail area by applying the pre-learned object recognition technology to nail recognition.

The capturing angle analyzer 330 may analyze the capturing angle at which the nail image is captured. The nail image may be photographed differently depending on the shooting direction, and in particular, the present invention calculates the curvature of the nail surface to determine the three-dimensional shape of the nail. In particular, the curved surface of the nail may have a different curvature depending on the viewing direction. More specifically, when the nail is rotated left or right in the longitudinal direction of the finger in the bird's eye view image of the nail, the length of the horizontal width of the nail can be measured shorter than when the nail touches the ground and is positioned horizontally with the ground. . Accordingly, the photographing angle analyzer 330 may analyze the photographing angle at which the bird's eye view image is photographed based on the vertical direction of the ground where the nail is located.

In addition, in the side view image of the nail, it may be assumed that the nail is rotated up or down in the longitudinal direction of the finger. Fingernails or fingers including fingernails may rotate only in the longitudinal direction of the fingers as an axis, but may be understood to be rotated left and right (bird's eye view or front view) or up and down (side view) according to the viewing direction. When the nail is rotated upward in the lateral direction, the height on the side of the nail may be measured shorter than when the nail is rotated downward. Accordingly, the photographing angle analyzer 330 may analyze the photographing angle at which the side view image is photographed with respect to the side view image, based on the central portion of the nail body.

The photographing angle analyzer 330 analyzes the photographing angle at which the nail image is photographed, and corrects the bird's eye view, side view, or front view image to the original photographing reference line, or the size measurement unit 340 or the curvature calculator 350 calculates the analysis result. ), so that the size measurement unit 340 or the curvature calculation unit 350 can measure the size or use it as correction data when calculating the curvature.

The size measuring unit 340 may measure the dimensions of the cross section of the nail in the bird's eye view image, and more specifically, measure the width or length (height) of the cross section of the two-dimensional nail. Considering that the nail has a three-dimensional shape, the size measurement unit 340 first measures the dimensions of the two-dimensional cross-section of the nail, and then the curvature calculation unit 350 measures the curvature of the nail to correct the cross-section of the nail, thereby providing more accurate results. A three-dimensional shape can be grasped.

Since the cross-sectional bird's-eye view image is an image of the entire nail body, it can be used to determine the overall shape and size of the nail. However, at this time, the width or vertical (height) length measured by the size measuring unit 340 may be a straight line distance on a bird's eye view image. That is, since the bird's eye view image does not reflect the fact that the nail is bent left and right or up and down, the size measuring unit 340 measures only the straight line distance in the cross section of the nail without considering the shortened length due to the bending. Here, in order to distinguish the straight line distance and the horizontal length considering curvature in the cross section of the nail in the transverse direction, the length measured by the size measuring unit 340 is named 'width', and the calculated curvature is then reflected. Thus, the length calculated by the length correction unit 360 is named 'arc length'.

On the other hand, nails generally have a narrow width at the root of the nail in the transverse direction, and widen from the root of the nail to the tip of the nail, so that the free edge is formed. ) is widest near Accordingly, the size measuring unit 340 may measure the width of the nail root and the boundary between the free edge in consideration of these characteristics of the nail.

In addition, the sonteo is generally in the form of a convex arc at the end, and the center is the longest in the vertical direction. Accordingly, the size measurement unit 340 may measure the center of the longest fingernail.

The size measurement unit 340 may measure the size of the nail using a background card photographed together with the nail in the bird's eye view image. The size measurement unit 340 may measure the arc length of the nail boundary line in the bird's eye view image. The nail boundary line determines the outline of the nail, and may refer to a boundary line dividing a finger skin and a connected nail area. The arc of the boundary line of the nail, the free edge at the tip of the nail, the root of the nail, or the corner where both sides of the nail root connect to each other may mean a round shape. A method of measuring the arc length of the nail boundary line will be described later in detail with reference to FIGS. 4A and 4D.

The curvature calculation unit 350 may calculate the curvature of the curved surface of the nail using the front view image and the side view image. The curvature calculator 350 may include a front measurement unit 3501 and a side measurement unit 3503 .

The front measurement unit 3501 may measure the curvature values of both side surfaces of the nail in the front view image. A method of measuring the curvature values of both sides by the front measuring unit 3501 will be described in detail with reference to FIGS. 4B and 4D. The side measuring part 3503 can measure the height between the central part and the side part of the nail body. The curvature calculation unit 350 may measure the degree of curvature of both sides of the nail using the front curvature measured by the front measurement unit 3501 and the nail height measured by the side measurement unit 3503 . In addition, the side measurement unit 3503 may measure the curvature value of the nail body in the longitudinal direction in the side view. A method of measuring the curvature value of the side measuring unit 3503 will be described later in detail with reference to FIGS. 4C and 4D.

The length correction unit 360 may calculate the length of the curved surface of the nail by correcting the size by reflecting the calculation result of the curvature calculation unit 350 to the size measured by the size measurement unit 340 . More specifically, the length correction unit 360 reflects the curvature values of both sides measured by the curvature calculation unit 350 with respect to the horizontal width measured by the size measurement unit 340 in the length of the nail in the horizontal direction. Thus, the width can be extended to compensate for the arc length in the horizontal direction. In addition, the length correction unit 360 is bent in the longitudinal direction of the nail body measured by the curvature calculation unit 350 with respect to the vertical (height) length measured by the size measurement unit 340 in the length of the nail in the longitudinal direction. Reflecting the curvature value, the vertical length may be expanded to correct the arc length in the vertical direction.

The image generator 370 may generate a 3D nail image of a curved nail by synthesizing calculation results of the size measurer 340 and the curvature calculator 350 . The image generator 370 may generate individual 3D nail images for each nail of the actual user, and the 3D nail image may reflect a curvature bent in a horizontal direction or a vertical direction.

The storage unit 380 may classify and store the 3D images generated by the image generator 370 according to the user or each nail. Since the storage unit 380 categorizes and stores 3D images of each nail of individual users, a user who previously measured nails using the nail measurement system 30 may not measure nails later. However, nails may become longer and deform over time. The nail measuring system 30 may additionally update and utilize information on each nail shape of the user by re-measuring according to changes in the shape of the nail of the user.

3 shows a state in which a fingernail is recognized by the object recognizing unit 320 according to an embodiment of the present invention. 3A is a state in which nail images of a plurality of user nails are captured. For more accurate nail recognition by the object recognizing unit 320, it may be recommended that the nail image be captured while the hand is placed on the background card as shown in FIG. 3A. 3B is a state in which the object recognizing unit 320 recognizes a background card from a nail image. A background card according to an embodiment of the present invention may have a rectangular shape, and by recognizing the background card, other backgrounds other than the nail and the background card may be removed to narrow the recognition target range. 3C is a state in which the object recognizing unit 320 recognizes a plurality of fingernails. The object recognizing unit 320 may extract a nail area distinguished from a finger within the range of the background card narrowed in FIG. 3B. At this time, the object recognizing unit 320 can recognize individual nails and recognize a plurality of nails at once.

4 shows a state in which the curvature of a nail is calculated by the curvature calculation unit 350 according to an embodiment of the present invention. 4A shows the size measurement unit 340 in a bird's eye view image of the width (w ₁ , w ₂ ), length (height) (h ₁ , h ₂ , h ₃ ) or arc length (l _{1 )} of the nail boundary line of the two-dimensional nail section. to l ₅ ) is measured. As described above, the width of the nail is narrowest at the base of the nail, and the width is widest at the boundary between the nail body and the free edge. Accordingly, the size measuring unit 340 may measure the width of the nail by measuring the width of the nail root (w ₂ ) and the width of the boundary between the nail body and the free edge (w ₁ ).

The size measuring unit 340 is in the vertical direction, and can distinguish the vertical length of the nail based on the width (w ₁ ) of the boundary between the nail body and the free edge. Referring to FIG. 4A , the total vertical length (h 1 ) of the nail may be measured by dividing the free edge length (h ₂ ) and the nail body portion ( _{h 3} ). The reason why the total vertical length (h ₁ ) of the nail is divided into the free edge length (h ₂ ) and the nail body part (h ₃ ) is that the length of the nail body part (h ₃ ) is constant, while the free edge length (h ₂ ) is because the length variation is possible. In addition, since the curvature bent in the vertical direction may be different from the nail body portion and the free edge portion, it may be measured separately.

Also, the size measuring unit 340 may measure the arc lengths (l ₁ to l ₅ ) of the nail boundary line. The arc of the nail boundary line may include a free edge (l ₁ ), a nail root portion (l ₂ ), or a round shape (l ₃ ) of a corner portion connecting both sides of the nail root portion. The length of the arc of the nail boundary line can be calculated by assuming that the curved part is a part of the entire circle, and by expanding the arc part to create a circle having the same curvature as the arc. That is, the length of the arc formed by the boundary line of the nail can be calculated by measuring the radius of the generated circle and measuring the angle (θ _n ) between both ends of the arc.

More specifically, the length (l ₁ ) of the arc of the free loop creates a circle having the same curvature as the arc of the free loop so that the arc formed by the free loop becomes part of the circle, and the radius (r _! ) of the circle is measured. And, by measuring the angles (θ) of both ends formed by the free edge, the length (l ₁ ) occupied by the arc of the free edge in the entire circle is measured. That is, l _n can be calculated as in Equation 1 below.

[Equation 1]

(l _n is the length of the arc, r _n is the length of the radius, and θ _n is the angle formed by both ends of the arc.)

로 표현될 수 있다.At this time, the angle (θ ₁ ) of both ends of the arc (l ₁ ) formed by the free edge can be calculated as follows through FIG. 4d. 4D shows how _θn is calculated using three points of a circle (the center of the circle (C) and two points (P, Q) on the circle). If the circle of FIG. 4D is more generalized, it can be expressed as x ² +y ² +Ax+By+c=0. At this time, the center (C) of the circle is (-A/2, -B/2), and the radius (r) is

can be expressed as

Here, the center (C(-A/2, -B/2)) of the circle of FIG. 4D may be the center of the circle created in FIG. 4A. The two points P(x ₁ , y ₁ ) and Q(x ₂ , y ₂ ) on the circle of FIG. 4D may be both end points of the free edge of FIG. 4A . Therefore, since the center (C) of the circle and the two points (P, Q) on the circle are already known, θ _n can be calculated using the three points.

의 기울기(m₁)를 산출할 수 있다. m₁은

표현될 수 있다. 마찬가지로, C(-A/2, -B/2))와 원 위의 점(Q(x₂, y₂))를 통해 직선

의 기울기(m₂ =

)를 산출할 수 있다. m₁과 m₂가 이루는 사잇각에 대하여 다음과 같은 수학식 2를 통해 θ_n을 산출할 수 있다.First, the straight line formed by the center of the circle (C(-A/2, -B/2)) and the point on the circle (P(x ₁ , y ₁ ))

The slope (m ₁ ) of can be calculated. m ₁ is

can be expressed Similarly, a straight line through C(-A/2, -B/2)) and a point on the circle (Q(x ₂ , y ₂ ))

slope of (m ₂ =

) can be calculated. With respect to the angle formed by m ₁ and m ₂ , θ _n can be calculated through Equation 2 below.

[Equation 2]

The length of the arc of the nail root (l ₂ ), the corner portion (l ₃ ) where the nail root and both sides are connected, and the above-mentioned θ _n and It can be calculated in the same way that l ₁ was calculated.

In addition, the size measuring unit 340 may learn a relational expression for the relationship between an arc and a circle and calculate a result for _ln through a pre-learned learning result. Accordingly, the size measurement unit 340 may measure the dimensions of the cross-section of the nail captured in the bird's eye view image.

4B is a state in which the front measurement unit 3501 of the curvature calculation unit 350 measures the length l ₄ of an arc in the horizontal direction by reflecting the curved shape of both side surfaces of the nail through the front view image. l ₄ may be calculated in the same way as described above with reference to FIG. 4a. That is, r ₄ can be measured by creating a circle with l ₄ as a part of the circle, and l ₄ can be calculated through this. Referring to FIG. 4B , it can be seen that l ₄ is longer than w ₁ . That is, l ₄ may be w ₁ +α, and α may vary depending on the degree of curvature of the nail.

4C is a state in which the side measurement unit 3503 of the curvature calculator 350 measures the length l ₅ of the vertical arc by reflecting the curved shape of the nail body through the side view image. The method for measuring l ₅ is the same as the method described above. In addition, through the side view image of the nail, the vertical length of the nail can be more clearly distinguished.

5 is a state in which a 3D nail image suitable for the user's nail is generated and applied to the user's nail through the results measured and calculated by the size measurer 340 and the curvature calculator 350.

Although the present invention has been described in detail through representative embodiments, those skilled in the art will understand that various modifications are possible to the above-described embodiments without departing from the scope of the present invention. will be. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by all changes or modifications derived from the claims and equivalent concepts as well as the claims to be described later.

1: Nail decoration creation system
10: image receiver
30: analysis unit (nail measuring system)
310: receiver
320: object recognition unit
330: shooting angle analysis unit
340: size measuring unit
350: curvature calculation unit
3501: front measurement part
3503: side measuring part
360: length correction unit
370: image generator
380: storage unit
50: nail image generator

Claims (8)

a receiving unit for receiving a bird's eye view, side view, or front view image as a nail image captured for a nail;
an object recognizing unit recognizing individual nails from the plurality of nail images;
a size measuring unit measuring a size of a cross-section of a nail in the bird's eye view image;
a curvature calculation unit calculating a curvature of a curved surface of the nail using the front view image and the side view image; and
Including an image generator for generating a 3D nail image for a curved nail by synthesizing the calculation results of the size measurer and the curvature calculator,
A nail measurement system capable of measuring the curvature of the nail surface.
According to claim 1,
In the nail image,
A background card showing the standard length for nail size measurement and the nail are photographed together,
The nail measuring system, characterized in that the background card is used when measuring the size of the nail in the size measuring unit.
According to claim 1,
The nail measurement system further comprising a capturing angle analyzer for analyzing a capturing angle at which the nail image is photographed.
According to claim 3,
The shooting angle analysis unit,
For the bird's eye view image, a photographing angle at which the bird's eye view image was taken is analyzed based on the vertical direction of the ground where the nail is located,
The nail measurement system characterized in that for analyzing the side view image, a photographing angle at which the side view image is captured based on the central portion of the nail body (nail body).
According to claim 1,
The curvature calculator,
a frontal measuring unit for measuring a curvature value of both side surfaces of the nail in the frontal view image; and
In the side view, a curvature of the nail body in the longitudinal direction or a side measurement unit for measuring a height between the central portion and the side portion of the nail body, characterized in that for calculating the curvature of the curved surface of the nail nail measuring system.
According to claim 1,
The size measuring unit,
Measure the width, length (height) or arc length of the nail boundary line of the two-dimensional nail section in the bird's eye view image,
The nail measurement system of claim 1, further comprising a length correcting unit for calculating a length of a curved surface of the nail by correcting the size by reflecting the calculation result of the curvature calculating unit to the size measured by the size measuring unit.
According to claim 1,
The nail measuring system further comprises a storage unit for storing the 3D image generated by the image generation unit by classifying it according to the user or each nail.
An image receiving unit for receiving a bird's eye view, side view, or front view image as a nail image of a user's nail photographed from the ground, side, or front;
an analysis unit generating a 3D nail image of a user's nail through the nail image; and
a nail image generating unit generating a 3D nail image by combining a decoration image previously selected by a user with the 3D nail image;
The analysis unit,
an object recognizing unit recognizing individual nails in the bird's eye view, side view, or front view image;
a size measuring unit measuring a size of a cross section of a nail in the bird's eye view image;
a curvature calculation unit that calculates a curvature of a curved surface of a nail using the front view image and the side view image; and
Including an image generator for generating a 3D nail image for a curved nail by synthesizing the calculation results of the size measurer and the curvature calculator,
Nail decoration creation system capable of creating user-customized nail images.

Images