JP2017055933A - Nail shape detection device, drawing device, and nail shape detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nail shape detection device capable of accurately detecting a curved shape of a nail with a simple configuration without involving a special mechanism, and a drawing device and a nail shape detection method.SOLUTION: A nail shape detection device comprises: a photographing unit 50 for photographing a nail T of a finger; a luminance detection unit 812 for detecting an area having higher luminance than a prescribed value in a photographed image taken by the photographing unit 50 as a high luminance part Wp; an angle detection unit 813 for detecting an inclination angle of a portion corresponding to the high luminance part Wp in the nail T on the basis of the position of the photographing unit 50 and the position of the high luminance part Wp in the photographed image; and a nail shape detection unit 814 for detecting a curved shape of the nail T on the basis of the inclination angle detected by the angle detection unit 813.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a nail shape detection device, a drawing device, and a nail shape detection method in the nail shape detection device.

2. Description of the Related Art Conventionally, a drawing apparatus that draws a nail design on a nail is known (see, for example, Patent Document 1).
If such an apparatus is used, a nail design can be easily enjoyed without using a nail salon or the like.

Special table 2003-534083 gazette

However, the nail that is the drawing target of the drawing device for nail printing has a curved shape in which the height decreases and the inclination increases toward both ends in the width direction.
For this reason, if a design image is drawn on the nail without considering this curved shape, the design is distorted, and a beautiful finish is not obtained.

In order to draw an image without distortion on the nail, it is necessary to perform curved surface correction on the drawing data so as to match the curved shape of the nail, but the curved shape of the nail varies depending on the person.
For this reason, if the correction value is uniformly determined and corrected, the result is not beautiful, and it is desired to perform correction according to the curved shape of each nail of the user.

  The method for obtaining the curved shape of the object is to irradiate the surface of the object with line laser light, photograph the line formed on the surface of the object with the line laser light from an oblique direction, and based on this image An optical cutting method for acquiring a three-dimensional shape (a change in shape in the height direction or a curved shape) is known.

  However, when such a light cutting method is used, it is necessary to mount an irradiation unit for irradiating a line laser beam in the drawing apparatus, which increases the size of the apparatus and increases the weight. Further, since this irradiation unit is a mechanism that has not been conventionally provided in a drawing apparatus, an increase in cost due to the mounting of the irradiation unit is inevitable.

  An object of the present invention is to provide a nail shape detection device, a drawing device, and a nail shape detection method capable of accurately detecting the curved shape of the nail with a simple configuration without providing a special mechanism. .

In order to solve the above-described problem, the nail shape detection device of the present invention includes:
A shooting unit for acquiring a shot image of a fingernail;
A luminance detection unit for detecting a region where the luminance in the captured image is higher than a predetermined value as a high luminance unit;
An angle detection unit that detects an inclination angle of a location corresponding to the high luminance part in the nail based on the position of the photographing unit and the position of the high luminance part in the photographed image;
A nail shape detector for detecting the curved shape of the nail based on the tilt angle;
It is characterized by having.

  According to the present invention, it is possible to accurately detect the curved shape of the nail with a simple configuration without providing a special mechanism.

(A) is a front view of the drawing apparatus in this embodiment, (b) is a side view which shows the internal structure of the drawing apparatus shown by (a). (A) is a top view of the drawing head in the present embodiment, and (b) is a side view of the drawing head in the present embodiment. It is a principal part block diagram which showed the control structure of the drawing apparatus which concerns on this embodiment. (A) is explanatory drawing which shows the position of the imaging | photography part and high-intensity part when image | photographing a nail | claw from right above, (b) is an imaging | photography part and image | photographing part in the case of image | photographing a nail | claw from a side part. It is explanatory drawing which shows a position. It is the 1st explanatory view showing the position of a photography part and a high-intensity part at the time of photographing several times, moving a photography part. It is the 2nd explanatory view showing the position of an image pick-up part and a high-intensity part at the time of photographing several times, moving an image pick-up part. (A)-(d) is explanatory drawing which shows the position of the high-intensity part which appears in a picked-up image at the time of imaging | photography several times, moving an imaging | photography part. It is explanatory drawing which shows the classification example of the curved shape pattern of a nail | claw. It is a flowchart which shows the nail | claw shape detection process and drawing process of the drawing apparatus which concerns on this embodiment. It is explanatory drawing for demonstrating the modification of the method of classifying the curved shape of a nail | claw. It is explanatory drawing which shows an example of the table for detecting the inclination angle of the nail | claw corresponding to a high-intensity part.

1 to 8, an embodiment of a nail print device (nail shape detection device, drawing device) and a nail shape detection method in a nail print device (nail shape detection device, drawing device) according to the present invention will be described. To do.
The embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.
Further, in the following embodiment, the nail print apparatus 1 will be described assuming that the fingernail of the hand is drawn on this, but the drawing target of the present invention is not limited to the fingernail of the hand, For example, the toenails may be drawn.

FIG. 1A is a front view of the nail printing apparatus showing the internal configuration of the nail printing apparatus, and FIG. 1B is a side view showing the internal configuration of the nail printing apparatus shown in FIG. It is. FIG. 2 is a cross-sectional view taken along line II-II in FIG.
As shown in FIGS. 1A and 1B, the nail print apparatus 1 according to the present embodiment includes a pen 41, which is a drawing tool, and an ink jet drawing unit 71, and a plotter method and an ink jet method. Is a drawing device for drawing on the nail T of the printing finger U1.
The nail printing apparatus 1 includes a case main body 2 and an apparatus main body 10 accommodated in the case main body 2.

  A lid 23 configured to be openable and closable is provided at one upper end of the side surface of the case main body 2 in order to replace a pen 41 and an ink jet drawing unit 71 of the drawing unit 40 which will be described later. The lid 23 is rotatable from a closed state to an open state as shown in FIG. 1 via, for example, a hinge.

An operation unit 25 (see FIG. 3) is installed on the upper surface (top plate) of the case body 2.
The operation unit 25 is an input unit on which a user performs various inputs.
The operation unit 25 includes, for example, a power switch button for turning on the power of the nail printing apparatus 1, a stop switch button for stopping the operation, a design selection button for selecting a design image to be drawn on the nail T, and a drawing start for instructing a drawing start. Operation buttons (not shown) for performing various inputs such as buttons are arranged.

In addition, a display unit 26 is installed at a substantially central portion of the upper surface (top plate) of the case body 2.
The display unit 26 includes, for example, a liquid crystal display (LCD), an organic electroluminescence display, or other flat displays.
In the present embodiment, the display unit 26 includes, for example, a nail image obtained by photographing the printing finger U1 (a finger image including an image of the nail T), a contour line of the nail T included in the nail image, and the like. An image, a design selection screen for selecting a design image to be drawn on the nail T, a thumbnail image for design confirmation, an instruction screen for displaying various instructions, and the like are appropriately displayed.
Note that a touch panel for performing various inputs may be integrally formed on the surface of the display unit 26.

  The apparatus main body 10 is formed in a substantially box shape, and a lower machine casing 11 installed below the inside of the case main body 2 and an upper machine installed above the lower machine casing 11 and above the inside of the case main body 2. And a frame 12.

First, the lower machine casing 11 will be described.
The lower machine casing 11 includes a back plate 111, a bottom plate 112, a pair of left and right side plates 113 a and 113 b, an X-direction moving stage accommodating portion 114, a Y-direction moving stage accommodating portion 115 and a partition wall 116.
The lower ends of the side plates 113a and 113b are connected to the left and right ends of the bottom plate 112, respectively, and the side plates 113a and 113b are provided in a state where they stand up against the bottom plate 112.
The lower part of the back plate 111 is formed to be recessed in two steps toward the front (front side in the finger insertion direction). A lower end portion of the back plate 111 is connected to a front end portion of the bottom plate 112, and the back plate 111 divides a region surrounded by the bottom plate 112 and the side plates 113a and 113b back and forth.
A space formed on the back side of the recessed back plate 111 is an X-direction moving stage accommodating portion 114 and a Y-direction moving stage accommodating portion 115 (see FIG. 1B). In the X-direction moving stage accommodating portion 114, the X-direction moving stage 45 of the drawing portion 40 is accommodated when the drawing portion 40 moves forward (front side in the finger insertion direction). A Y-direction moving stage 47 of the drawing unit 40 is disposed in the Y-direction moving stage accommodating unit 115.
Further, the partition wall 116 divides the space on the front side inside the lower machine casing 11 (the space on the front side in the finger insertion direction surrounded by the back plate 111, the bottom plate 112, and the side plates 113a and 113b) vertically. Is provided inside. The partition wall 116 is provided substantially horizontally, the left and right ends of the partition wall 116 are connected to the side plates 113 a and 113 b, respectively, and the rear end portion of the partition wall 116 is connected to the back plate 111.

The lower machine casing 11 is integrally provided with a finger fixing unit 30 (see FIG. 1B).
The finger fixing unit 30 includes a finger receiving unit 31 that receives a finger (hereinafter referred to as “printing finger U1”) corresponding to a nail T (that is, a drawing target) to be drawn, and a finger other than the printing finger U1 (hereinafter referred to as “printing finger U1”). , Which is referred to as “non-printing finger U2”).
The finger receiving portion 31 is disposed on the upper side of the partition wall 116, for example, slightly to the right of the center in the width direction of the lower machine casing 11. In addition, a space partitioned by the partition wall 116 on the lower side of the lower machine casing 11 constitutes the finger retracting portion 32.
For example, when drawing on the nail T of the ring finger, the ring finger as the printing finger U1 is inserted into the finger receiving unit 31, and the other four fingers (thumb, forefinger, middle finger, little finger) as the non-printing finger U2 are pointed. Insert into the retracting portion 32.
The finger receiving portion 31 is open on the front side of the lower machine casing 11 (the front side in the printing finger insertion direction), and the lower side is a finger placement portion that constitutes a part of the partition wall 116. The finger placement unit places a finger (printing finger U1) of the nail T to be drawn on the XY plane.
Moreover, the upper side of the finger receiving part 31 is opened, and the surface of the nail T of the printing finger U1 inserted into the finger receiving part 31 (that is, the drawing target surface) is exposed.

Further, front walls 31 f (see FIG. 1A) that stand up the front side of the lower machine casing 11 are erected on both sides of the front surface of the lower machine casing 11 on the upper surface of the partition wall 116. In addition, a pair of guide walls 31g (which narrows from the end near the center of the front wall 31f toward the finger receiving portion 31 and guides the printing finger U1 into the finger receiving portion 31 on the upper surface of the partition wall 116f. 1 (a)) is erected.
The user can sandwich the partition wall 116 between the printing finger U1 inserted into the finger receiving unit 31 and the non-printing finger U2 inserted into the finger retracting unit 32. Therefore, the printing finger U1 inserted into the finger receiving part 31 is stably fixed.

It will be described later on the upper surface of the lower machine casing 11 and next to the finger receiving portion 31 (a position corresponding to the medium insertion / exit 24 of the case main body 2 and on the left side in FIG. 1A). Within the range that can be drawn by the drawing head 43, there is provided a custom writing section 61 for performing break-in writing to eliminate blurring at the time of writing a pen tip (tip portion) 413 of the pen 41, which will be described later.
The custom writing portion 61 is a flat plate portion on which a drawing medium (not shown) inserted from the medium insertion port 24 of the case body 2 is placed.
The drawing medium placed on the custom writing unit 61 may be any medium that can perform the writing-in of the pen tip (tip portion) 413, for example, a piece of paper.

On the upper surface of the lower machine casing 11, on the opposite side of the custom writing unit 61 across the finger receiving unit 31 (in this embodiment, on the right side in FIG. 1A), the movable range of the drawing head 43 described later is movable. A number of pen caps 62 (one in the present embodiment) corresponding to pen holders 42 described later are installed therein.
The pen cap 62 is formed of rubber, for example, and when drawing is not performed with the pen 41 attached to the drawing unit 40 (when not drawing), the pen 41 is lowered and the pen tip 413 is lowered. Is housed in the pen cap 62, so that the pen tip 413 is prevented from drying.
In addition, an ink jet maintenance unit 63 is provided at a position corresponding to a position where the ink jet drawing unit 71 is disposed when the pen tip 413 is accommodated in the pen cap 62. The ink jet maintenance unit 63 includes, for example, a cleaning mechanism for cleaning an ink discharge unit (nozzle surface) of an ink jet drawing unit 71 described later, a cap mechanism for maintaining a moisturized state of the ink discharge unit (nozzle surface), etc. (Not shown).
In addition, arrangement | positioning of the pen cap 62, the inkjet maintenance part 63, etc. is not limited to what was illustrated here.

  The drawing unit 40 includes a drawing head 43, a unit support member 44 that supports the drawing head 43, and an X direction for moving the drawing head 43 in the X direction (the X direction in FIG. 1A and the left and right directions of the drawing apparatus 1). A moving stage 45, an X-direction moving motor 46, a Y-direction moving stage 47 for moving the drawing head 43 in the Y direction (Y direction in FIG. 1B, the front-rear direction of the drawing apparatus 1), a Y-direction moving motor 48, etc. It is configured with.

FIG. 2A is a top view of the drawing head in the present embodiment, and FIG. 2B is a side view of the drawing head.
As shown in FIGS. 2A and 2B, the drawing head 43 according to this embodiment includes a pen holder 42 that holds the pen 41 and an inkjet holder 72 that holds the inkjet drawing unit 71 adjacent to each other. Has been.
The ink jet drawing unit 71 faces, for example, an ink cartridge (not shown) corresponding to yellow (Y; YELLOW), magenta (M; MAGENTA), and cyan (C; CYAN) ink and a drawing target (nail T) in each ink cartridge. This is an ink cartridge integrated head in which an ink discharge portion (not shown) provided on the surface to be formed (in this embodiment, the lower surface in FIG. 1A and the like) is integrally formed. The ink discharge unit includes a nozzle array including a plurality of nozzles that eject ink of each color, and the ink jet drawing unit 71 atomizes the ink and draws a drawing target (nail T) from the ink discharge unit. Drawing is performed by spraying ink directly on the surface. The ink jet drawing unit 71 is not limited to the one that ejects the three colors of ink. You may provide the ink cartridge and ink discharge part which store another ink.

One pen 41 can be attached to the pen holder 42 of the present embodiment.
The pen 41 is a writing instrument that uses the surface of the nail T as a drawing target surface and draws the tip part in contact with the surface of the nail T that is the drawing target surface.
As shown in FIG. 2B and the like, the pen 41 is provided with a pen tip 413 on the tip end side (lower side in FIG. 2B) of the rod-shaped pen shaft portion 411.
The interior of the pen shaft portion 411 is an ink storage portion that stores various inks.
Various types of ink can be applied as the ink stored in the pen shaft portion 411. The viscosity of the ink and the particle size (particle size) of the color material are not particularly limited. For example, gold-silver glitter ink, white ink, UV curable ink, gel nail, undercoat ink, top A coating ink, a nail polish, or the like can also be used.

In the present embodiment, the pen 41 is a ballpoint pen type in which, for example, the pen tip 413 is pressed against the surface of the nail T so that the ink contained in the pen shaft portion 411 oozes out and is drawn. It is a pen.
The pen 41 is not limited to a ballpoint pen type. For example, a sign pen type in which ink is soaked in a felt-shaped pen tip or a brush pen type in which ink is soaked into a bundled hair and drawn may be used.
Various types of pen tip 413 can be prepared.
The pens 41 held by the pen holder 42 may all be pens having the same type of pen tip 413 or may be pens having different types of pen tip 413.
The pen 41 is held only by being inserted into the pen holder 42 from above. For this reason, the cover part 23 provided in the case main body 2 can be easily exchanged by opening the lid part 23 and picking up and pulling out the upper end part of the pen shaft part 411 with a hand or tweezers.
Thereby, a user implement | achieves a wide nail design by replacing suitably the pen 41 with which the pen holder 42 is mounted | worn with the pen 41 from which the color, the kind of pen tip 413, and the kind of ink differ according to the nail design to draw. Can do.

The pen holder 42 has a tubular member 421 that is opened up and down and into which the pen 41 is inserted, and a pen unit that is disposed so as to close the opening on the lower side (lower side in FIG. 2B) of the tubular member 421. A stop member 422 and an auxiliary shaft member 423 that moves up and down together with the pen 41 are provided.
The pen locking member 422 is formed with a locking hole 422 a that locks the tip end side of the pen shaft 411 of the pen 41. The pen 41 is locked in the pen holder 42 by fitting the tip end side of the pen shaft portion 411 into the locking hole 422 a of the pen locking member 422. A screw groove (not shown) is formed on the outer peripheral surface of the pen shaft portion 411 on the tip side, and a screw groove (not shown) that can be screwed with the screw groove of the shaft portion is formed on the inner peripheral surface of the locking hole 422a. The pen 41 may be locked to the locking hole 422a by screwing the screw groove on the pen shaft portion 411 side into the screw groove on the hole 422a side.
In the present embodiment, two auxiliary shaft members 423 are arranged so as to sandwich the pen 41. The lower end portion of each auxiliary shaft member 423 is fitted into the pen locking member 422, whereby the auxiliary shaft member 423 is fixed to be parallel to the pen shaft portion 411 of the pen 41.
The auxiliary shaft member 423 is provided with a locking projection 424 that protrudes away from the axis center of the pen 41.
A coil spring 425 is wound around the axis of the auxiliary shaft member 423. The coil spring 425 urges the auxiliary shaft member 423 upward in a state where no external force is applied, and holds the position of the pen 41 at a position where the pen tip 413 does not contact the nail T in the non-drawing state.

In the vicinity of the pen holder 42, a pen up / down motor 426 formed of a stepping motor, a gear 428 meshed with a gear 427 attached to a rotation shaft of the pen up / down motor 426, and a rotation following the rotation of the gear 428. A moving plate spring 429 is provided. In the present embodiment, the pen 41 up / down motor 426, the gear 427, the gear 428, the leaf spring 429, and the like constitute an elevation mechanism for the pen 41.
Here, the leaf spring 429 engages with a locking projection 424 provided on the auxiliary shaft member 423 and pushes down the locking projection 424 so that the pen 41 can be pushed down. Yes.
That is, when the leaf spring 429 rotates with the rotation of the pen up / down motor 426, the leaf spring 429 engages with the locking projection 424, and the locking projection 424 is pushed down, the pen 41 is moved to the coil spring 425. It is pushed down against the urging force.
As described above, in this embodiment, the pen 41 is not pushed down directly by the leaf spring 429, but the locking protrusion 424 is pushed down, and the leaf spring 429 does not cover the upper side of the pen 41, so that the pen 41 can be easily replaced. In addition, the height of the lifting mechanism of the pen 41 can be kept relatively low, and space saving can be achieved.

Here, the operation of the lifting mechanism of the pen 41 will be specifically described.
First, when not drawing, the leaf spring 429 does not apply an external force to the locking protrusion 424. In such a state where no external force (pressing force by the leaf spring 429) is applied, the pen 41 is pushed upward (upward in FIGS. 1A and 2B) by the biasing force of the coil spring 425. The pen tip 413 that is the tip of the pen 41 is separated from the surface of the nail T that is the drawing target surface, and is held at a height that does not contact the surface.
On the other hand, at the time of drawing, the pen up / down motor 426 is rotated by a predetermined number of steps, and the locking projection 424 is pushed down by the leaf spring 429. Thereby, the pen 41 is pushed down.
The predetermined number of steps when driving the pen up / down motor 426 is appropriately set according to the height of the nail T of the printing finger U1 inserted into the finger receiving unit 31 or the like.
That is, the nail print apparatus 1 according to the present embodiment acquires nail information described later in advance. Then, based on the nail information, the height of the nail T at the abutting position where the pen tip 413 which is the tip of the pen 41 abuts on the nail T is recognized, and the pen up / down motor 426 is detected according to the height. Determine the number of steps. The pen up / down motor 426 is driven with the number of steps determined in this manner, and the pen 41 is pushed down by the leaf spring 429 so that the pen tip 413 of the pen 41 is brought into contact with the surface of the nail T and an appropriate writing pressure is applied. To do.
When drawing, when the height of the portion where the nail T is drawn changes with the change in the drawing position, the number of steps of the pen up / down motor 426 is increased or decreased each time. Drawing is performed while adjusting the pressure so that the writing pressure is substantially constant. Here, the adjustment of the writing pressure by increasing / decreasing the number of steps of the pen up / down motor 426 is performed every time the height of the nail T changes by a predetermined amount (for example, 0.5 mm). When the change is less than the predetermined amount, the pen pressure is not adjusted. At this time, the pen spring 41 is automatically moved up and down as the leaf spring 429 is bent and deformed (elastically deformed) according to the shape of the nail T. The pen pressure can be kept in contact with the nail T and at the same time the writing pressure can be kept at an appropriate value.
Note that the spring constant of the leaf spring 429 is not so large, and this spring constant is set to such a value that the nail T does not feel pain when the pressing force (external force) by the leaf spring 429 is applied to the nail T. Has been. Further, when drawing, the leaf spring 429 is appropriately bent to absorb the impact caused by the vertical movement of the pen 41, and the pen tip 413 is maintained in a state where a substantially constant appropriate writing pressure is applied. The pen 41 can move up and down following the height of the nail T, and a desired nail design can be clearly drawn on the surface of the nail T to be drawn.

Further, the unit support member 44 is fixed to an X direction moving unit 451 attached to the X direction moving stage 45. The X-direction moving unit 451 moves in the X direction along a guide (not shown) on the X-direction moving stage 45 by driving the X-direction moving motor 46, and is thereby attached to the unit support member 44. The drawing head 43 is moved in the X direction (X direction in FIG. 1A, left and right direction of the nail printing apparatus 1).
The X direction moving stage 45 is fixed to the Y direction moving portion 471 of the Y direction moving stage 47. The Y-direction moving unit 471 is moved in the Y-direction along a guide (not shown) on the Y-direction moving stage 47 by driving the Y-direction moving motor 48, and is thereby attached to the unit support member 44. The drawing head 43 is moved in the Y direction (Y direction in FIG. 1B, the front-rear direction of the nail printing apparatus 1).
In this embodiment, the X direction moving stage 45 and the Y direction moving stage 47 are configured by combining an X direction moving motor 46 and a Y direction moving motor 48 with a ball screw and a guide (not shown).
In the present embodiment, a head moving unit 49 as an XY driving unit that drives the drawing head 43 including the pen 41 in the X direction and the Y direction is configured by the X direction moving motor 46, the Y direction moving motor 48, and the like.

  The pen up / down motor 426, the ink jet drawing unit 71, the X direction moving motor 46, and the Y direction moving motor 48 in the drawing unit 40 are connected to a drawing control unit 817 (see FIG. 3) of the control device 80 to be described later. It is controlled by the unit 817.

The photographing unit 50 includes an imaging device 51 and an illumination device 52.
The photographing unit 50 illuminates the nail T of the printing finger U1 inserted into the finger receiving unit 31 and visible from the upper opening by the illumination device 52. The imaging device 51 captures the printing finger U1 to obtain a nail image (an image of the finger including the nail image) that is an image of the nail T of the printing finger U1.
In the present embodiment, the imaging device 51 and the illumination device 52 are fixedly disposed on the side of the drawing head 43 of the drawing unit 40 (on the left side of the drawing head 43 in FIG. 1A).
That is, as shown in FIG. 2A, the drawing head 43 of the drawing unit 40 has a protruding portion 401 that protrudes laterally on one end side of the upper surface (left side in FIG. 2A). The substrate 53 is attached to the overhang portion 401. The imaging device 51 and the illumination device 52 constituting the imaging unit 50 are provided on the lower surface of the substrate 53 so as to face the partition wall 116.
The size of the substrate 53 and the positions of the imaging device 51 and the illumination device 52 attached to the substrate 53 are not particularly limited.

The imaging device 51 is a small camera configured to include, for example, a solid-state imaging device having about 2 million pixels or more, a lens, and the like.
The imaging device 51 is configured to photograph the nail T from a plurality of positions and angles by movement by the head moving unit 49 in order to detect the curved shape of the nail T of the printing finger U1.
Thereby, a plurality of photographed images (nail images) are acquired, and based on these photographed images (nail images), a luminance detection unit 812 (see FIG. 3) described later has a luminance in the photographed image higher than a predetermined value. A portion, that is, a high luminance portion Wp (see FIG. 6A to FIG. 6D, etc.) that is the highest luminance portion is detected, and an angle detection unit 813 (see FIG. 3) corresponds to the high luminance portion Wp. The inclination angle of the nail T is detected, and the nail shape detector 814 (see FIG. 3) detects the curved shape of the nail T based on the detection result. The nail shape detection unit 814 detects other nail information such as the contour of the nail T (shape of the nail T) and the vertical position of the nail T based on the captured image (nail image) acquired by the imaging device 51. To do.

The illumination device 52 is a light source such as a white LED.
In the present embodiment, one illumination device 52 is disposed on the side of the imaging device 51 (on the left side of the imaging device 51 in FIGS. 1A and 2A). The illumination device 52 irradiates light downward and illuminates at least a photographing range below the imaging device 51. The position of the illumination device 52 with respect to the imaging device 51 is constant. The number of the lighting devices 52 provided, the arrangement thereof, and the like are not limited to the illustrated example.
The illumination device 52 according to the present embodiment performs illumination for performing imaging for recognizing the contour shape of the nail T and illumination for performing imaging for detecting the curved shape of the nail T (inclination angle of the nail T). And both are supposed to do.

  In other words, the illumination device 52 of the present embodiment can irradiate light over a wider range than the imageable range of the imaging device 51, and the light emitted from the illumination device 52 is applied to the entire surface including the end of the nail T. Incident light is reflected on the surface of the nail T and the like, and a part of the reflected light (that is, light entering the light receiving range of a lens (not shown) of the imaging device 51) is reflected by the imaging device 51 (the lens of the imaging device 51). ). Accordingly, the imaging device 51 can capture an image of the entire nail T, and the nail shape detection unit 814 recognizes the contour shape of the nail T from the captured image (nail image) obtained by the imaging.

Further, the surface of the nail T is a non-uniform diffuse reflection surface, and the intensity of the reflected light is the highest in the regular reflection direction, and the luminous intensity decreases as it deviates from the regular reflection direction. Thereby, in the captured image captured by the imaging device 51, the portion corresponding to the reflected light in the regular reflection direction is the portion with the highest luminance (hereinafter referred to as “high luminance portion Wp”. FIG. 6A to FIG. 6. (See (d) etc.). In the photographed image, this high luminance portion Wp usually appears as a so-called “whiteout” having the highest luminance value. Note that the high-luminance portion Wp is not necessarily “out-of-white”, and may have relatively high luminance in the captured image.
In the present embodiment, the brightness detection unit 812, which will be described later, detects this overexposed portion or a portion with relatively high brightness as the high brightness portion Wp, and the angle detection unit 813 detects the high brightness portion. The inclination angle θ of the nail T corresponding to Wp (see FIGS. 4A and 4B) is detected.

The photographing unit 50 is connected to a photographing control unit 811 (see FIG. 3) of the control device 80 described later, and is controlled by the photographing control unit 811.
Note that image data of an image photographed by the photographing unit 50 is stored in a nail image storage area 821 of the storage unit 82 described later.

The control device 80 is installed on, for example, the substrate 13 disposed on the upper machine casing 12.
FIG. 3 is a principal block diagram showing a control configuration in the present embodiment.
As shown in FIG. 3, the control device 80 includes a control unit 81 configured by a CPU (Central Processing Unit) (not shown), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like (both not shown). And a storage unit 82 constituted by the computer.

The storage unit 82 stores various programs and various data for operating the nail printing apparatus 1.
Specifically, the ROM of the storage unit 82 has a luminance detection program for detecting the high luminance portion Wp from the nail image (captured image), and angle detection for detecting the inclination angle of the nail T from the nail image (captured image). Nail information detection program for detecting various nail information such as a planar shape of the nail T (that is, the contour of the nail T), a curved shape in the width direction of the nail T, a nail width, and a nail area from the nail image Various programs such as a drawing data generation program for generating drawing data and a drawing program for performing drawing processing are stored, and when these programs are executed by the control device 80, Each part is controlled centrally.
Further, in the present embodiment, the storage unit 82 is detected by the nail image storage area 821 for storing the nail image (captured image) of the nail T of the user's printing finger U1 acquired by the imaging unit 50, and the nail shape detection unit 814. The nail information storage area 822 for storing the nail information (the outline of the nail T, the curved shape of the nail T, etc.) and the nail design storage area 823 for storing the image data of the nail design drawn on the nail T are provided. It has been.

  When functionally viewed, the control unit 81 includes a photographing control unit 811, a luminance detection unit 812, an angle detection unit 813, a nail shape detection unit 814, a drawing data generation unit 815, a display control unit 816, a drawing control unit 817, and the like. I have. The functions of the imaging control unit 811, the luminance detection unit 812, the angle detection unit 813, the nail shape detection unit 814, the drawing data generation unit 815, the display control unit 816, the drawing control unit 817, and the like are stored in the CPU of the control unit 81. This is realized by cooperation with a program stored in the ROM of the unit 82.

The imaging control unit 811 controls the imaging device 51 and the illumination device 52 of the imaging unit 50, and the nail that is an image of a finger including the image of the nail T of the printing finger U1 inserted into the finger receiving unit 31 by the imaging device 51. An image (captured image) is captured.
In the present embodiment, the imaging control unit 811 moves the imaging unit 50 in the width direction of the nail T by the drawing control unit 817 that controls the head moving unit 49, and the imaging control unit 811 uses the imaging device 51 to perform a plurality of positions in the width direction of the nail T. The nail T is photographed from an angle (for example, directly above the nail T and obliquely above the nail T), and a plurality of nail images (captured images) are acquired.
The number of captured images to be acquired for one nail T is not particularly limited, but it is preferable to acquire as many captured images as possible in order to detect the curved shape of the nail T, and at least in the width direction of the nail T. It is preferable to perform photographing three or more times at different positions.
The photographing may be performed a plurality of times while moving the photographing unit 50 from the end on one end side of the nail T to the end on the other end. For example, the photographing may be performed on the one end side from the central portion in the width direction of the nail T. You may image | photograph several times, moving the imaging | photography part 50 to an edge part. Even in this case, since the nail T is generally symmetric in many cases, if the left or right shape of the nail T is known, it can be estimated that the shape on the other side is the same.
The image data of the nail image acquired by the imaging unit 50 is stored in the nail image storage area 821 of the storage unit 82.

The luminance detection unit 812 detects the high luminance part Wp, which is the highest luminance part, from the captured image (nail image) captured by the imaging unit 50. In the present embodiment, the luminance detection unit 812 detects the position where the regular reflection light is captured by the imaging device 51 of the imaging unit 50 as the high luminance unit Wp. Since the portion appears as a whiteout portion or a portion with relatively high luminance in the captured image, the luminance detection unit 812 displays an area where the luminance in the captured image is higher than a predetermined value as high luminance. Let it be a part Wp. Here, the predetermined value is usually set in the vicinity of the maximum luminance.
Note that the high-luminance portion Wp detected by the luminance detection unit 812 is not necessarily a point, but may be a region (an assembly of pixels) having a certain extent (for example, FIG. 6A to FIG. d)). In this case, the angle detection unit 813 described later obtains the center position of the region of the high luminance portion Wp and detects the inclination angle θ for this.

  In the present embodiment, the high luminance part Wp is a position where the specular reflection light is captured by the photographing unit 50, that is, a position where the light emitted from the illumination device 52 is specularly reflected.

The angle detection unit 813 uses the inclination angle θ of the nail T corresponding to the portion where the high luminance part Wp appears based on the position of the photographing unit 50 and the position where the high luminance part Wp appears in the photographed image (nail image) (FIG. 4). (A) and FIG. 4 (b)) are detected.
The positions of the imaging device 51 and the like of the imaging unit 50 are measured, for example, from the amount of movement of the imaging device 51 and the like in the X direction by the head moving unit 49 grasped on the device side. Note that the method of detecting the position of the imaging device 51 and the like of the imaging unit 50 is not limited to this, and for example, by comparing a plurality of acquired captured images (nail images), the imaging device 51 is displayed on the captured image. The amount of movement may be measured.
In the present embodiment, the angle detection unit 813 detects the inclination angle in the width direction of the nail T corresponding to the portion where the high-luminance portion Wp appears, for a plurality of captured images (nail images).
When the high brightness portion Wp is a region having a certain extent, the angle detection unit 813 extracts the center position of the region and detects the inclination angle of the nail T corresponding to the center position. .

4A and 4B are explanatory diagrams for explaining the positions of the imaging device 51 and the illumination device 52 and the inclination angle θ of the nail T corresponding to the high brightness portion Wp of the nail T. FIG.
4A and 4B, the imaging device 51 in the width direction of the nail T, that is, the position in the width direction of the nail T corresponding to the high luminance portion Wp, that is, the center position of the image in the width direction of the nail T. The difference (shift amount) from the center position (the center position C in FIGS. 4A and 4B) of the lens (not shown of the imaging device 51) corresponds to “x” and corresponds to the high brightness portion Wp. The difference (shift amount) between the position in the width direction of the nail T and the center position of the irradiation device 52 in the width direction of the nail T is “x + d”, and the distance from the nail T to the imaging device 51 (the lens of the imaging device 51) Is “z”.
Strictly speaking, the distance from the nail T to the image pickup device 51 (the lens of the image pickup device 51) is set so that the height of the nail T is the same as when the nail T has the highest height. Although this differs depending on when the vicinity of the end of the low nail T is photographed, in this embodiment, this is not considered as an error, and “z” is treated as a fixed value.
In the above case, the incident angle of the light incident on the nail T from the irradiation device 51 at the position corresponding to the high luminance part Wp is “arctan ((x + d) / z)”, and is reflected at the position corresponding to the high luminance part Wp. Thus, the angle of the light incident on the imaging device 51 (the lens of the imaging device 51) is “arctan (x / z)”.
And the inclination | tilt angle (theta) with respect to the horizontal direction H of the position of the nail | claw T corresponding to the high-intensity part Wp is computable by the following formula | equation 1. FIG.

That is, as illustrated in FIG. 4A, when the imaging device 51 and the illumination device 52 are arranged right above the nail T and the nail T is photographed, the height that appears as overexposure in the photographed image (nail image). The position on the nail T corresponding to the luminance part Wp is substantially the center in the width direction of the nail T. When the substantially central portion in the width direction of the nail T is substantially flat (that is, the inclination angle θ is 0 degree), the position in the width direction of the nail T corresponding to the high luminance portion Wp and the imaging device 51 (in the width direction of the nail T) ( The deviation x from the center position of the imaging device 51 (ie, the image center position when taking an image) C, the position in the width direction of the nail T corresponding to the high brightness portion Wp, and the width direction of the nail T The amount of deviation x + d from the center position of the irradiation device 51 is substantially equal, and the inclination angle θ with respect to the horizontal direction H of the high luminance portion Wp obtained by Expression 1 is approximately 0 degrees.
On the other hand, as shown in FIG. 4B, when shooting is performed by moving the imaging device 51 and the illumination device 52 to the vicinity of the end in the width direction of the nail T, whiteout occurs in the captured image (nail image). The position of the nail T corresponding to the high-intensity part Wp that appears as is a portion with an inclination near the end in the width direction of the nail T.
In this case, the inclination angle θ with respect to the horizontal direction H of the position of the nail T corresponding to the high luminance part Wp calculated by Expression 1 is the position in the width direction of the nail T corresponding to the high luminance part Wp and the width direction of the nail T. Changes in accordance with the amount of deviation x from the center position C of the imaging device 51 (the lens of the imaging device 51).
Thus, the inclination angle θ of the position of the nail T corresponding to the high luminance part Wp with respect to the horizontal direction H is determined by the position of the high luminance part Wp in the width direction of the nail T and the imaging device 51 (imaging in the width direction of the nail T). Since it is proportional to the amount of deviation from the center position C of the lens of the device 51, it is possible to detect the inclination angles θ at a plurality of positions in the width direction of the nail T by performing photographing at a plurality of positions in the width direction of the nail T. it can.

5 and 6 show the imaging device 51 and the illumination device 52 from the substantially central portion in the width direction of the nail T toward one end portion in the width direction of the nail T (the left end portion in FIGS. 5 and 6). It is explanatory drawing illustrated about the case where it image | photographed 4 times, moving sequentially. In FIG. 5 and FIG. 6, two types of nails having different curved shapes (a nail Ta indicated by a solid line and a nail Tb indicated by a broken line) are respectively high-intensity portions Wp (in the nail Ta) that appear as whiteout in a photographed image (nail image). It shows how the high luminance part Wpa and the high luminance part Wpb) of the nail Tb move.
5 and 6, the high-intensity portion Wpa corresponding to the nail Ta having a relatively small inclination angle is indicated by a white circle, and corresponds to the nail Tb having a larger inclination angle at the end in the width direction of the nail T than the nail Ta. The high luminance part Wpb to be shown is indicated by a black circle.
FIGS. 7A to 7D show examples of captured images (nail images) captured at the respective positions in FIGS. 5 and 6.
As shown in FIGS. 5 and 6, when shooting is performed while gradually moving the shooting position from directly above the nail T toward the end, as shown in FIGS. 7A to 7D. The positions of the high-intensity portions Wpa and Wpb that are overexposed also move from the substantially central portion in the width direction of the nail T toward the end of the nail T.

The nail shape detection unit 814 detects nail information about the nail T of the printing finger U1 based on the image of the nail T of the printing finger U1 inserted into the finger receiving unit 31 photographed by the imaging device 51. .
Here, the nail information includes, for example, the contour of the nail T (nail shape, XY coordinates of the horizontal position of the nail T, etc.), the height of the nail T (the vertical position of the nail T, hereinafter “the vertical position of the nail T”). Or simply the “position of the nail T”), the shape in the width direction of the nail T, that is, the inclination angle of the surface of the nail T with respect to the XY plane (the curved shape of the nail T, the inclination angle of the nail T), etc. is there.
The nail shape detection unit 814 detects nail information using a plurality of nail images photographed from a plurality of different positions and angles (for example, directly above the nail T and obliquely above the nail T).
In particular, in the present embodiment, the nail shape detection unit 814 detects the curved shape in the width direction of the nail T based on the inclination angles θ of the nail T at a plurality of positions in the width direction of the nail T detected by the angle detection unit 813. To do.
In the present embodiment, a plurality of curved shape patterns of the nail T are stored in advance in the storage unit 82, and the nail shape detection unit 814 has the inclination of the nail T in the width direction of the nail T detected by the angle detection unit 813. Based on the angle, the curved shape of the nail T is classified into one of a plurality of preset curved shape patterns.

FIG. 8 shows an example of the curved shape pattern of the nail T in the present embodiment.
FIG. 8 illustrates a case where five types of curved shape patterns from level 1 (L1 in FIG. 8) to level 5 (L5 in FIG. 8) are prepared.
As shown in FIG. 8, the curved shape patterns L1 to L5 classify the curved shape of the nail T in the width direction (width direction W in FIG. 8) into five patterns. They are divided by positions P1 to P5 at which the inclination angle in the width direction is 45 degrees.
That is, the curved shape pattern L1 is the flattened nail T, and has an inclination angle of 45 degrees at the position P1 near the end of the nail T. The curved shape pattern L5 is the claw T having the largest curvature, and has an inclination angle of 45 degrees at a position P5 that is near the middle between the center portion and the end portion of the claw T. The curved shape patterns L2 to L4 are the intermediate shape of the nail T. In the curved shape pattern L2, the inclination angle is 45 degrees at the position P2, and in the curved shape pattern L3, the inclination angle is 45 degrees at the position P3. In the pattern L4, the inclination angle is 45 degrees at the position P4.
Based on the inclination angle θ of the nail T at a plurality of positions in the width direction of the nail T detected by the angle detection unit 813, the nail shape detection unit 814 determines at which position P1 to P5 the inclination angle is 45 degrees. And the closest one of the five curved shape patterns L1 to L5 is selected as the curved shape of the nail T accordingly.

The drawing data generation unit 815 generates drawing data for drawing applied to the nail T of the printing finger U1 by the drawing head 43 based on the nail information detected by the nail shape detection unit 814.
Specifically, the drawing data generation unit 815 matches the shape of the nail T by enlarging, reducing, or cutting out nail design image data based on the shape of the nail T detected by the nail shape detection unit 814. Align processing is performed.
In addition, the drawing data generation unit 815 appropriately performs curved surface correction or the like on the image data of the nail design designated to be drawn on the nail T according to the curved shape of the nail T detected by the nail shape detection unit 814. It also functions as a data correction unit. For example, the curved surface correction value for each of the curved shape patterns L1 to L5 is stored in the storage unit 82 or the like, and the drawing data generation unit 815 stores the curved surface correction value corresponding to the curved shape pattern selected by the nail shape detection unit 814. The image data is subjected to curved surface correction to generate drawing data.
Thereby, data for drawing a nail design drawn by the pen 41 or the ink jet drawing unit 71 is generated.

  The display control unit 816 controls the display unit 26 to display various display screens on the display unit 26. In the present embodiment, the display control unit 816 displays, for example, a nail design selection screen, a thumbnail image for design confirmation, a nail image obtained by photographing the printing finger U1, various instruction screens, an operation screen, and the like on the display unit 26. It is supposed to be displayed.

The drawing control unit 817 outputs a control signal to the drawing unit 40 based on the drawing data generated by the drawing data generation unit 815, and the drawing unit 40 performs drawing according to the drawing data on the nail T. The control unit controls the X-direction movement motor 46, the Y-direction movement motor 48, the pen up / down motor 426, the ink jet drawing unit 71, and the like.
Specifically, the drawing control unit 817 controls the pen up / down motor 426 when the pen 41 is not drawing to maintain the state in which the locking projection 424 is not pushed down by the leaf spring 429, and at the time of drawing the pen up / down motor. 426 is operated, the locking projection 424 is pushed down by the leaf spring 429, and the operation of the pen up / down motor 426 is controlled so that the tip end portion (pen tip 413) of the pen 41 is in contact with the surface of the nail T.
It should be noted that the drawing control unit 817 appropriately increases or decreases the number of steps of the pen up / down motor 426 where the height of the claw T greatly changes and the leaf spring 429 is not deformed (elastically deformed). It is preferable to adjust the writing pressure so that the writing pressure is substantially constant.

  Next, a nail shape detection method and a drawing method by the nail print apparatus 1 according to the present embodiment will be described with reference to FIG.

When drawing with the nail printing apparatus 1, the user first turns on the power switch to activate the control apparatus 80.
The display control unit 816 displays a design selection screen on the display unit 26, and the user operates the operation button or the like of the operation unit 25 to select a desired nail design from a plurality of nail designs displayed on the design selection screen. select. As a result, a selection instruction signal is output from the operation unit 25 and a nail design to be drawn on the nail T is selected.
When the nail design is selected, the display control unit 816 causes the display unit 26 to display an instruction screen that prompts the user to set the pen 41 necessary for drawing the nail design in the predetermined pen holder 42 of the drawing head 43. The user sets a predetermined type of pen 41 in the predetermined pen holder 42 according to the instruction displayed on the display screen. At this time, the user may input information related to the pen 41 set in the pen holder 42 (such as the type of ink contained in the pen 41) from the operation unit 25 or the like. When information regarding the pen 41 is input, the input information is output to the control unit 81.
Next, as shown in FIG. 9, the display control unit 816 causes the display unit 26 to display an instruction screen that prompts the user to set the print finger U1 on the finger receiving unit 31 (step S1). The user inserts the printing finger U1 into the finger receiving unit 31, inserts the non-printing finger U2 into the finger retracting unit 32, fixes the printing finger U1, and then operates a drawing switch (not shown) of the operation unit 25.

When an instruction is input from the drawing switch, the drawing control unit 817 first controls the head moving unit 49 to move the shooting unit 50 to a predetermined shooting start position before starting the drawing operation (step S2). For example, when shooting is started from directly above the nail T, the head moving unit 49 is controlled so that the shooting unit 50 is positioned directly above the nail T.
Then, the photographing control unit 811 controls the photographing unit 50 to photograph the printing finger U1 by the imaging device 51 while illuminating the printing finger U1 by the illumination device 52. Thereby, the imaging control unit 811 acquires a captured image (nail image) of the nail T of the printing finger U1 inserted into the finger receiving unit 31 (step S3).
Next, the drawing control unit 817 controls the head moving unit 49 again to move the photographing unit 50 to the next photographing position (step S4). For example, when photographing while moving 2 mm from the photographing start position toward one end of the nail T, the nail T is moved by 2 mm along the width direction of the nail T from the position directly above the nail T. The head moving unit 49 is controlled so as to move to the end side.
Then, the imaging control unit 811 controls the imaging unit 50 again and causes the imaging device 51 to image the printing finger U1 while illuminating the printing finger U1 by the illumination device 52. Thereby, the imaging control unit 811 acquires a captured image (nail image) of the nail T of the printing finger U1 inserted into the finger receiving unit 31 (step S5).

The control unit 81 determines whether or not the predetermined number of times of shooting has been performed (step S6). When it is determined that the predetermined number of times of shooting has not been performed (step S6; NO), the control unit 81 returns to step 4. Then, the photographing unit 50 is moved to the next photographing position, and further photographing is performed.
Note that the determination by the control unit 81 is not limited to whether or not a predetermined number of times of shooting has been performed, and for example, from one end side to the other end side in the width direction of the nail T or the nail T It may be determined whether or not the photographing within a predetermined range, such as from the center in the width direction to one end side in the width direction of the nail T, has been completed.
On the other hand, when it is determined that the image has been shot a predetermined number of times (step S6; YES), the luminance detecting unit 812 detects the high luminance portion Wp that is the highest luminance portion for each acquired captured image (nail image). (Step S7).
Further, the angle detection unit 813 detects the inclination angle θ of the nail T corresponding to the high luminance part Wp detected by the luminance detection unit 812 (step S8).
Then, the nail shape detection unit 814 detects the curved shape of the nail T in the width direction based on the inclination angle θ of the nail T corresponding to the high luminance part Wp detected by the angle detection unit 813 (step S9). Specifically, for example, a curved shape pattern closest to the curved shape of the nail T is selected from the curved shape patterns prepared in advance (curved shape patterns L1 to L5 in FIG. 8).
In addition, the inclination angle θ of the nail T is detected at a plurality of positions from one end side to the other end side in the width direction of the nail T, and based on the result, it is determined that the user's nail T corresponds to different curved shape patterns on the left and right. In this case, different curved patterns may be selected with the central portion of the nail T as a boundary.

Further, the nail shape detection unit 814 detects other nail information such as the outline (nail shape) of the nail T based on the nail image (captured image) (step S10).
When the nail shape detection unit 814 detects nail information such as the curved shape of the nail T and the contour (nail shape) of the nail T, the drawing data generation unit 815 performs the nail design based on the nail information. The fitting of the image data to the nail T (the fitting process) and the curved surface correction of the image data according to the curved shape of the nail T are performed. Thereby, drawing data is generated (step S11). When the nail shape detection unit 814 selects different curved shape patterns with the central portion of the nail T as a boundary, the drawing data generation unit 815 converts each curved shape pattern with the central portion of the nail T as a boundary. The curved surface correction of the image data is performed by applying the corresponding curved surface correction value.

  When the drawing data is generated, the drawing control unit 817 outputs the drawing data to the drawing unit 40 and operates the head moving unit 49 to appropriately move the drawing head 43 while the pen 41 or the inkjet drawing unit is moved to the nail T. Drawing by 71 is performed (step S12).

As described above, according to the present embodiment, the high-luminance portion Wp that is the portion with the highest luminance is detected from the photographed image (nail image), and the position where the high-luminance portion Wp appears in the photographed image and the photographing unit 50 are detected. The inclination angle θ of the nail T corresponding to the portion where the high-luminance portion Wp appears is detected based on the position, and the curved shape of the nail T is detected based on the detection result.
Thereby, based on the nail image acquired by the existing imaging | photography part 50 provided in the apparatus in order to detect the shape and position of the nail | Tail, without using the optical cutting method using a laser, etc. A curved shape can be obtained. For this reason, the curved shape of the nail | Tail T can be obtained, it is not necessary to provide the special mechanism for detecting a curved shape, and an apparatus structure can be simplified.
In the present embodiment, the imaging unit 50 captures the nail T from a plurality of different positions in the width direction of the nail T to acquire a plurality of captured images (nail images), and the inclination of the nail T from each captured image. The angle θ is detected, and the curved shape of the nail T is detected based on the angle θ. For this reason, the curved shape of the claw T can be accurately detected.
In the present embodiment, since the position where the specularly reflected light is captured by the photographing unit 50 is the high luminance part Wp, the high luminance part Wp can be easily detected.
Further, the nail shape detection unit 814 classifies the nail T into one of a plurality of curved shape patterns based on the inclination angle of the nail T in the width direction of the nail T. As a result, an appropriate detection result can be obtained without accurately detecting the curved shape of the nail T.
Since the nail design image data drawn on the nail T is subjected to curved surface correction based on the detection result by the nail shape detecting unit 814, appropriate curved surface correction corresponding to the curved shape of the nail T can be performed. A beautifully finished nail print without distortion can be realized.

  Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, in the present embodiment, the case where five types of curved shape patterns of the nail T, L1 to L5, are prepared and the nail T is classified into any one of these is illustrated, but the curved shape pattern is not limited to five types. You may make it classify | categorize in any of fewer patterns, such as three types.
Further, more than five types of curved shape patterns may be prepared, and the user's nails T may be classified more finely. In this case, it is possible to perform more precise curved surface correction in accordance with the shape of the nail T.

In the present embodiment, the curved shape pattern of the nail T is shown as an example in which the pattern is divided on the basis of the position where the inclination angle θ of the nail T is 45 degrees. However, the angle serving as a reference when pattern classification is performed Is not limited to 45 degrees.
Furthermore, the curved shape pattern of the nail T is not limited to that classified by the position where the inclination angle θ of the nail T is a predetermined angle.
For example, a plurality of types of bending shape patterns having different bending methods are prepared, and pattern matching with each of the bending shape patterns with the inclination angles θ at a plurality of positions in the width direction of the nail T detected by the angle detection unit 813 is performed. By performing, the nail | Tail T may be classified into any curved shape pattern.

The nail T need not be continuously photographed from one end side to the other end side of the nail T. The nail T is photographed at several positions (points) at which features of the curved shape can be obtained. A captured image (nail image) may be acquired.
For example, as shown in FIG. 10, the central portion (50% in FIG. 10) in the width direction of the nail T from one end side (0% in FIG. 10) to the other end side (100% in FIG. 10). Then, photographing was performed at three positions 30% before and after that (namely, 20% position and 80% position in the width direction of the nail T in FIG. 10), and three nail images ( On the basis of the captured image), the detection of the high luminance part Wp and the inclination angle θ of the nail T corresponding to the high luminance part Wp may be performed, and the curved shape of the nail T may be detected based on this. Also in this case, by looking at the central portion (50% in FIG. 10) in the width direction of the nail T and the inclination angle θ at the position 30% before and after that, the nail T is made a relatively flat nail T1, It is possible to classify the nails T into a plurality of curved shape patterns, such as the largely curved nail T3 and the middle curved liquid nail T2.

Further, in the present embodiment, the angle detection unit 813 has exemplified the case where the inclination angle θ of the nail T corresponding to the high luminance part Wp is obtained using the formula (formula 1) prepared in advance. The method for obtaining the inclination angle θ of the nail T corresponding to the high luminance part Wp is not limited to this.
For example, a table for obtaining the tilt angle θ may be stored in advance in the storage unit 82 or the like, and the tilt angle θ may be obtained with reference to this table.
FIG. 11 shows an example of a table for obtaining the inclination angle θ of the nail T corresponding to the high luminance part Wp.
In this case, a table as shown in FIG. 11 is prepared for each position of the photographing unit 50. Then, for example, when the table corresponding to the position of the photographing unit 50 shows 0 degrees to 20 degrees as shown in FIG. The inclination angle (5 degrees in FIG. 11) can be obtained by applying this to the table using the number of pixels in the portion) as a variable.

In the present embodiment, the nail T is classified into a plurality of types of curved shape patterns (for example, five types of curved shape patterns L1 to L5 in FIG. 8), and a curved surface correction value corresponding to each curved shape pattern is applied. Thus, the curved surface correction of the image data is illustrated, but it is not essential to classify the nail T into a plurality of types of curved shape patterns in order to perform curved surface correction.
For example, a captured image (nail image) is continuously acquired along the width direction of the nail T, the high-intensity portion Wp is detected for all captured images (nail images) by the luminance detection unit 812, and the angle detection unit 813 If the inclination angle θ of the corresponding nail T is detected for all the high-luminance portions Wp and the inclination angle θ in the width direction of the nail T is continuously acquired, the nail T is classified into a plurality of types of curved shape patterns. It is also possible to perform more precise curved surface correction of each nail T without any problem.

  In this embodiment, the drawing head 43 includes one pen holder 42. However, the number of pen holders 42 provided in the drawing head 43 is not limited to one. For example, two or more pen holders 42 may be provided, and two or more drawing pens 41 may be held.

  Further, in the present embodiment, the case where the user manually replaces the pen 41 held by the pen holder 42 is illustrated as an example. However, for example, a standby space for waiting the pen 41 in the home area 60 is provided. The necessary pen 41 may be automatically acquired from the waiting space and replaced with the pen holder 42 by the pen replacement mechanism.

Moreover, although the case where the imaging device 51 and the illumination device 52 are mounted on the drawing head 43 is illustrated in the present embodiment, the position where the imaging device 51 and the illumination device 52 are provided is not limited thereto.
For example, a mechanism for moving the photographing unit 50 may be provided separately from the mechanism for moving the drawing head 43.

  Further, in this embodiment, the nail print apparatus 1 that performs drawing sequentially by inserting fingers one by one into the apparatus has been described as an example. However, a plurality of fingers can be continuously inserted without inserting or removing each finger. It is also possible to adopt a configuration that can perform drawing.

Although several embodiments of the present invention have been described above, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and equivalents thereof. .
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
A shooting unit for acquiring a shot image of a fingernail;
A luminance detection unit for detecting a region where the luminance in the captured image is higher than a predetermined value as a high luminance unit;
An angle detection unit that detects an inclination angle of a location corresponding to the high luminance part in the nail based on the position of the photographing unit and the position of the high luminance part in the photographed image;
A nail shape detector for detecting the curved shape of the nail based on the tilt angle;
A nail shape detection device comprising:
<Claim 2>
The imaging unit captures the nail at each of a plurality of different positions in the width direction of the nail to obtain a plurality of the captured images,
The angle detection unit detects the inclination angles at different positions in the width direction of the nail corresponding to each of the plurality of captured images;
The said nail shape detection part detects the curved shape of the said nail width direction based on the said inclination angle in the said several position in the width direction of the said nail detected by the said angle detection part. Item 2. The nail shape detection device according to Item 1.
<Claim 3>
The photographing unit includes a photographing device that photographs the nail, and a light source that illuminates the nail by irradiating the nail with light from a certain position shifted in the width direction of the nail with respect to the photographing device. A lighting device,
3. The high-luminance part corresponds to a position at which the light emitted from the light source is regularly reflected on the nail, and the reflected light is captured by the photographing part. The nail shape detection device according to 1.
<Claim 4>
The nail shape detecting unit classifies the curved shape of the nail into any one of a plurality of preset curved shape patterns based on the inclination angle detected by the angle detecting unit. The nail shape detection apparatus according to any one of claims 1 to 3.
<Claim 5>
The nail shape detection device according to any one of claims 1 to 4,
A drawing data generation unit that generates drawing data obtained by performing curved surface correction on image data of a nail design designated to be drawn on the nail based on the curved shape detected by the nail shape detection unit;
A drawing unit for drawing the nail based on the drawing data;
A drawing apparatus comprising:
<Claim 6>
A nail shape detection method in a nail shape detection device,
The nail shape detection device includes a photographing unit that obtains a photographed image of a fingernail,
An area where the luminance in the captured image is higher than a predetermined value is detected as a high luminance part,
Based on the position of the photographing unit and the position of the high-luminance part in the photographed image, the inclination angle of the portion corresponding to the high-luminance part in the nail is detected,
A nail shape detection method, comprising: detecting a curved shape of the nail based on the detected inclination angle.

DESCRIPTION OF SYMBOLS 1 Nail printing apparatus 31 Finger receiving part 40 Drawing part 41 Pen 43 Drawing head 49 Head moving part 50 Shooting part 71 Inkjet drawing part 81 Control part 82 Storage part 90 Drying part 426 Pen vertical motor 812 Brightness detection part 813 Angle detection part 814 Nail shape detection unit T Nail U1 Printing finger

Claims (6)

A shooting unit for acquiring a shot image of a fingernail;
A luminance detection unit for detecting a region where the luminance in the captured image is higher than a predetermined value as a high luminance unit;
An angle detection unit that detects an inclination angle of a location corresponding to the high luminance part in the nail based on the position of the photographing unit and the position of the high luminance part in the photographed image;
A nail shape detector for detecting the curved shape of the nail based on the tilt angle;
A nail shape detection device comprising: The imaging unit captures the nail at each of a plurality of different positions in the width direction of the nail to obtain a plurality of the captured images,
The angle detection unit detects the inclination angles at different positions in the width direction of the nail corresponding to each of the plurality of captured images;
The said nail shape detection part detects the curved shape of the said nail width direction based on the said inclination angle in the said several position in the width direction of the said nail detected by the said angle detection part. Item 2. The nail shape detection device according to Item 1. The photographing unit includes a photographing device that photographs the nail, and a light source that illuminates the nail by irradiating the nail with light from a certain position shifted in the width direction of the nail with respect to the photographing device. A lighting device,
3. The high-luminance part corresponds to a position at which the light emitted from the light source is regularly reflected on the nail, and the reflected light is captured by the photographing part. The nail shape detection device according to 1.   The nail shape detecting unit classifies the curved shape of the nail into any one of a plurality of preset curved shape patterns based on the inclination angle detected by the angle detecting unit. The nail shape detection apparatus according to any one of claims 1 to 3. The nail shape detection device according to any one of claims 1 to 4,
A drawing data generation unit that generates drawing data obtained by performing curved surface correction on image data of a nail design designated to be drawn on the nail based on the curved shape detected by the nail shape detection unit;
A drawing unit for drawing the nail based on the drawing data;
A drawing apparatus comprising: A nail shape detection method in a nail shape detection device,
The nail shape detection device includes a photographing unit that obtains a photographed image of a fingernail,
An area where the luminance in the captured image is higher than a predetermined value is detected as a high luminance part,
Based on the position of the photographing unit and the position of the high-luminance part in the photographed image, the inclination angle of the portion corresponding to the high-luminance part in the nail is detected,
A nail shape detection method, comprising: detecting a curved shape of the nail based on the detected inclination angle.

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