Method for measuring head shape

Abstract

To provide a measuring method of a head shape, which can easily obtain three-dimensional shape information of a head of a wearer wearing a wig and can correct the three-dimensional shape information in accordance with a state of the head of the wearer.SOLUTION: A measuring method of a head shape for manufacturing a wig includes covering a head of a wearer wearing the wig by a head measuring cap 1, and acquiring three-dimensional shape information on the head of the wearer, which is covered by the head measuring cap 1 by using a portable three-dimensional scanner 2. The head measuring cap 1 is transparent or translucent, a hair region boundary line indicating a range of the wig is drawn in the head measuring cap 1 before acquiring the three-dimensional shape information, and the hair region boundary line is included in the three-dimensional shape information. The portable three-dimensional scanner 2 transmits three-dimensional shape information to a shape information correction device 3, and the shape information correction device 3 performs prescribed correction on the three-dimensional shape information.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to wig manufacturing technology, and particularly to a method for measuring the head shape of a wig wearer.

Background Art

[0002] In order to manufacture a wig that is optimal for the wearer, it is necessary to measure the head shape of the wig wearer. However, in the measurement of the human body, there has been a problem that it is not easy to photograph fine details.

[0003] In particular, when measuring the head shape, it is necessary to measure including the shape of the periphery of the ear, but there has been a problem that the measurement is not easy because the ear becomes an obstacle. Further, when the subject to be photographed is a person, there has also been a problem that the subject inevitably moves during photographing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of Invention

Problems to be Solved by the Invention

[0005] Under such circumstances, as a means for measuring the head shape, the head shape measuring apparatus described in Patent Document 1 can be cited. According to this apparatus, it is possible to measure the head shape without giving a sense of pressure or intimidation to the person to be measured, simplify the positioning of the head in the measuring apparatus and shorten the photographing time, and it is possible to acquire three-dimensional image data that more accurately represents the three-dimensional shape near the hairline of the hair-bearing part on the head. However, even with this apparatus, there are problems that the measurement of the shape of the periphery of the ear is not easy, and the apparatus becomes large in size.

[0006] Furthermore, as a means of measuring head shape, the three-dimensional head model creation system described in Patent Document 2 can be cited. According to this system, a three-dimensional model can be created inexpensively and easily without requiring expensive equipment, the burden on the subject can be significantly reduced compared to conventional methods, and a three-dimensional model can be created with higher accuracy than conventional methods. However, this system requires the use of image acquisition devices such as tablets to capture images of the head from multiple angles at predetermined positions, making it a system that requires skill to use and not something that everyone can easily operate.

[0007] Therefore, the inventors diligently conducted research and discovered that it is possible to more easily obtain three-dimensional shape information of the head of a wig wearer by measuring the head shape using a portable three-dimensional scanner, thus completing the present invention. By the way, even when using a portable 3D scanner, if the subject being scanned is a person, the subject may move during the scan. Also, the portable 3D scanner may move due to the photographer's own hand tremors, which may prevent the acquisition of 3D shape information properly.

[0008] Furthermore, if the head is covered with a head measurement cap to accurately measure the head shape, errors may occur in the three-dimensional shape information due to the thickness of remaining natural hair and wig attachment pins. Therefore, in order to solve these problems, the inventors have made it possible to correct the three-dimensional shape information according to the condition of the wearer's head, such as the amount of remaining natural hair.

[0009] This invention has been made in view of the above circumstances, and aims to provide a method for measuring the shape of a head that can easily acquire three-dimensional shape information of the head of a wig wearer and correct the three-dimensional shape information according to the condition of the wearer's head. [Means for solving the problem]

[0010] To achieve the above objective, the present invention provides a method for measuring the shape of a head for manufacturing a wig, wherein the head of the wig wearer is covered with a head measurement cap, and a portable three-dimensional scanner is used to acquire three-dimensional shape information of the wearer's head covered with the head measurement cap.

[0011] Furthermore, the method for measuring the shape of the head according to the present invention preferably involves a head measurement cap that is transparent or semi-transparent, and prior to acquiring the three-dimensional shape information, a hair area boundary line indicating the wig area is drawn on the head measurement cap, and the three-dimensional shape information includes the hair area boundary line.

[0012] Furthermore, the method for measuring the head shape of the present invention preferably involves the portable three-dimensional scanner transmitting the three-dimensional shape information to a shape information correction device, and the shape information correction device performing a predetermined correction on the three-dimensional shape information. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a method for measuring head shape that can easily acquire three-dimensional shape information of the wearer's head and correct the three-dimensional shape information according to the wearer's head condition. [Brief explanation of the drawing]

[0014] [Figure 1] This is an explanatory diagram showing the measurement process according to the head shape measurement method according to an embodiment of the present invention. [Figure 2] This is an explanatory diagram showing how the head measurement cap is attached in the head shape measurement method according to an embodiment of the present invention. [Figure 3] This is a block diagram showing the configuration of a head shape correction device used in a head shape measurement method according to an embodiment of the present invention. [Figure 4] This is an explanatory diagram showing the details of the correction performed by the head shape correction device used in the head shape measurement method according to an embodiment of the present invention. [Figure 5]This is an explanatory diagram showing a wig shape correction screen displayed by the head shape correction device used in the head shape measurement method according to the embodiment of the present invention. [Figure 6] This is an explanatory diagram showing how the head measurement cap and the ear covering bag are worn in the head shape measurement method according to the embodiment of the present invention. [Figure 7] This is an explanatory diagram showing an ear portion cutout formed in the head measurement cap in the head shape measurement method according to the embodiment of the present invention. [Modes for Carrying Out the Invention]

[0015] Hereinafter, embodiments of the head shape measurement method of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the specific contents of the following embodiments. The head shape measurement method of the present embodiment is a head shape measurement method for manufacturing wigs, and as shown in Figure 1, the head of a wig wearer (hereinafter sometimes simply referred to as the wearer) is covered with a head measurement cap 1, and a portable three-dimensional scanner 2 is used to acquire three-dimensional shape information of the wearer's head covered with the head measurement cap 1.

[0016] The head measurement cap 1 is preferably transparent or translucent. Thereby, a measurer who measures the head shape of the wearer (hereinafter sometimes simply referred to as the measurer) can visually recognize the state of the hair on the wearer's head through the head measurement cap 1, and can distinguish the scalp portion and the hair portion.

[0017] In addition, by making the head measurement cap 1 transparent or translucent, the measurer can draw a hair region boundary line 11 indicating the range of the wig on the head measurement cap 1 as shown in Figure 2, prior to acquiring three-dimensional shape information by the portable three-dimensional scanner 2. The hair region boundary line 11 indicating the range of the wig indicates, for example, the range of a thinned hair portion on the wearer's head, the range with no hair, etc. (hereinafter may be collectively referred to as the thinned hair region), and the region surrounded by this hair region boundary line 11 corresponds to the shape of the wig base of the wig to be manufactured.

[0018] The material of the head measurement cap 1 is not particularly limited, but it is preferable to use stretchable natural fibers or chemical fibers so that the head measurement cap 1 can be in close contact with the wearer's head to accurately represent the shape of the head, and for example, semi-synthetic fibers such as triacetate, and synthetic fibers such as nylon and polyurethane are preferably used.

[0019] The measurer adjusts the depth to which the head measurement cap 1 is placed over the wearer's head according to the hair condition of the wearer. For example, when the thinned hair region is only at the crown of the head, the head measurement cap 1 is placed shallowly, and when the thinned hair region covers a wide range of the head, the head measurement cap 1 is placed deeply. Then, the measurer visually recognizes the thinned hair region of the wearer through the head measurement cap 1, and draws the hair region boundary line 11 on the surface of the head measurement cap 1 along the thinned hair region using a marker. At this time, the measurer selects the marker and its density according to the material of the head measurement cap 1, and adjusts the drawing strength so that the marker does not transfer to the wearer's head.

[0020] Then, as shown in FIG. 1, the measurer uses the portable three-dimensional scanner 2 to acquire three-dimensional shape information of the wearer's head covered by the head measurement cap 1. This three-dimensional shape information includes the hair region boundary line 11 drawn on the surface of the head measurement cap 1. At this time, the measurer can move the portable three-dimensional scanner 2 so as to go around the wearer's head once to acquire the three-dimensional shape information.

[0021] Further, when the thinned hair region is only at the crown of the head, the measurer can acquire the three-dimensional shape information by moving the portable three-dimensional scanner 2 so as to image the crown of the wearer's head. Furthermore, when photographing areas such as around the ears, it is possible to acquire three-dimensional shape information more accurately by moving the portable three-dimensional scanner 2 along the irregularities that appear on the surface of the head measurement cap 1.

[0022] Three-dimensional shape information is created by combining multiple scanned data. Various methods can be used for aligning the scanned data. For example, the marker alignment method uses a marker fixed to the subject as a reference, allowing for relatively accurate scanning. However, it has the characteristic of being difficult to measure accurately if the subject is moving.

[0023] Furthermore, the shape alignment method identifies and combines common parts from the scanned data, and has the advantage of not requiring the application of markers. For this reason, it is suitable for situations where the subject is moving, and can therefore be suitably used in the head shape measurement method of this embodiment.

[0024] Furthermore, the portable 3D scanner 2 transmits the three-dimensional shape information obtained in this manner to the shape information correction device 3. As this shape information correction device 3, for example, an information processing device such as a personal computer, tablet terminal, or smartphone can be used. The shape information correction device 3 can perform predetermined corrections on the three-dimensional shape information transmitted from the portable three-dimensional scanner 2.

[0025] Specifically, depending on the amount of hair on the wearer's head, the shape of the head measurement cap 1 placed over the head and the shape of the wearer's head will differ by the thickness of the hair, so the three-dimensional shape information is often larger than the actual shape of the head. In that case, the shape information correction device 3 can perform a correction process on the three-dimensional shape information to adjust for errors based on the thickness of the hair, for example, by making it smaller by about 1 to 2 mm, and create corrected three-dimensional shape information.

[0026] Furthermore, when using pins to attach a wig, the pins are sewn to the underside of the wig. As a result, the three-dimensional shape information may be relatively smaller than the wig's shape due to the thickness of the pins. In that case, the shape information correction device 3 can perform a correction process on the three-dimensional shape information to make it larger, for example by about 1 to 2 mm (a correction process to smooth the radius), in order to adjust for errors based on the thickness of the wig attachment pin, and create corrected three-dimensional shape information.

[0027] The shape information correction device 3 used in the head shape measurement method of this embodiment includes an input unit 31, a storage unit 32, a correction unit 33, and a display unit 34, as shown in Figure 3. The input unit 31 receives three-dimensional shape information of the wearer's head, captured by the portable three-dimensional scanner 2, from the portable three-dimensional scanner 2. The memory unit 32 stores the three-dimensional shape information input from the portable three-dimensional scanner 2 to the shape information correction device 3 via the input unit 31. The memory unit 32 also stores the corrected three-dimensional shape information.

[0028] The correction unit 33 performs a correction process on the three-dimensional shape information and creates corrected three-dimensional shape information. Specifically, as shown in Figure 4, for example, there are three types of corrections that can be performed on three-dimensional shape information: depth correction, front-to-back correction, and left-to-right correction.

[0029] Depth correction is a correction that adjusts the size of the wig in the depth direction (Z-axis direction). In the example in Figure 4, setting 1 mm in the "Top" column as the correction value executes a correction process that reduces the three-dimensional shape information by 1 mm in the Z direction. Front-to-back correction is a correction that adjusts the size of the wig in the front-to-back direction (Y-axis direction). In the example in Figure 4, by setting the correction value to 1 mm in the "front" and "back" columns, a correction process is performed that reduces the three-dimensional shape information by 1 mm in both the front and back directions along the Y-axis. Left-right correction is a correction that adjusts the size of the wig in the left-right direction (X-axis direction). In the example in Figure 4, by setting the correction value to 1 mm in the "Right" column and "Left" column, a correction process is performed that reduces the three-dimensional shape information by 1 mm on each side in the X-axis direction.

[0030] Furthermore, it goes without saying that values ​​other than 1 mm can be set as correction values ​​for depth correction, front-to-back correction, and left-to-right correction, and it is also possible to combine these correction values ​​and execute the correction process. Furthermore, by setting negative values ​​as the correction values ​​for these adjustments, it is also possible to perform a correction process that increases the three-dimensional shape information.

[0031] The display unit 34 displays a wig shape correction screen for executing the correction process performed by the correction unit 33. For example, as shown in Figure 5, an area for displaying the wig shape and an area for entering correction values ​​are displayed. Then, by pressing the execute button, the correction unit 33 corrects the three-dimensional shape information based on the input correction value and stores the corrected three-dimensional shape information in the storage unit 32.

[0032] Furthermore, in this embodiment, the method for measuring the head shape may also involve the portable three-dimensional scanner 2 transmitting three-dimensional head shape information to the shape information correction device 3, and the shape information correction device 3 performing smoothing processing on the three-dimensional shape information. In other words, although not shown in the diagram, it is also preferable to equip the shape information correction device 3 with a smoothing unit and perform smoothing processing on the three-dimensional shape information. Smoothing processing is a function that automatically fills in missing areas in the three-dimensional shape information that were missed by the portable three-dimensional scanner 2. By configuring the shape information correction device 3 used in the head shape measurement method of this embodiment in this way, it is possible to make the obtained three-dimensional shape information more easily usable in wig manufacturing.

[0033] The shape information correction device 3 can be implemented using a computer controlled by a program. The computer's CPU sends commands to each component of the computer based on the program, causing them to perform predetermined processes necessary for the operation of the shape information correction device 3, such as input processing of three-dimensional shape information, correction processing of three-dimensional shape information, and display processing of the correction screen. In this way, each process and operation in the shape information correction device 3 of the present invention can be implemented by specific means in which the program and the computer cooperate.

[0034] Programs are pre-stored on recording media such as ROM and RAM, and are loaded into a computer from these recording media and executed by the computer. However, they can also be loaded into a computer via a communication line, for example. Furthermore, the recording medium for storing the program can consist of, for example, semiconductor memory, magnetic disks, optical disks, or any other recording means that can be read by any computer.

[0035] Furthermore, the method for measuring the head shape in this embodiment may also involve attaching ear covering bags to the wearer's ears and then acquiring three-dimensional head shape information. In other words, as shown in Figure 6, in the head shape measurement method of this embodiment, it is also preferable to attach the ear covering bag 4 to the wearer's ears and then acquire three-dimensional head shape information using the portable three-dimensional scanner 2.

[0036] The ear covering bag 4 only needs to be able to cover the wearer's ear so that its shape is not captured as three-dimensional shape information by the portable three-dimensional scanner 2. The material is not particularly limited, but it is preferable to use an elastic natural fiber or chemical fiber, for example, a semi-synthetic fiber such as triacetate or a synthetic fiber such as nylon or polyurethane.

[0037] Furthermore, while the color of the ear covering bag 4 is not particularly limited, it is possible to make it black, for example, so that it is not captured as three-dimensional shape information by the portable three-dimensional scanner 2. By using this method to measure the head shape in this embodiment, it becomes possible to more efficiently remove extraneous ear information from the three-dimensional shape information.

[0038] Furthermore, the method for measuring the head shape in this embodiment may also involve forming an ear-removal section in the head measurement cap at a position corresponding to the wearer's ear, and then acquiring three-dimensional head shape information. In other words, as shown in Figure 7, in the head shape measurement method of this embodiment, it is also preferable to form an ear portion cutout 12 at a position corresponding to the wearer's ear on the head measurement cap 1, and then acquire three-dimensional head shape information using a portable three-dimensional scanner 2.

[0039] The ear portion excision area 12 can be formed by placing the head measurement cap 1 on the wearer and then using scissors or the like to excise the area of ​​the head measurement cap 1 corresponding to the wearer's ear. By using this method to measure the head shape in this embodiment, it becomes possible to acquire three-dimensional shape information for the entire head more efficiently.

[0040] As described above, according to the head shape measurement method of this embodiment, the wearer's head is covered with a head measurement cap 1, and three-dimensional shape information including the hair area boundary line 11, which indicates the thinning hair area with a marker, can be acquired by a portable three-dimensional scanner 2. Therefore, it is possible to acquire three-dimensional shape information that is easy to use in the manufacture of wigs with greater accuracy.

[0041] Furthermore, the shape information correction device 3 performs a correction process on the obtained three-dimensional shape information to adjust for errors based on hair thickness and the thickness of wig attachment pins, thereby creating corrected three-dimensional shape information. This makes it possible to obtain three-dimensional shape information that is even easier to use in wig manufacturing.

[0042] Furthermore, by covering the wearer's ears with ear covering bags and acquiring three-dimensional shape information, extraneous ear information can be more efficiently removed from the three-dimensional shape information. In addition, by forming ear area excision sections in the head measurement cap at positions corresponding to the wearer's ears and acquiring three-dimensional shape information, it is also possible to acquire three-dimensional shape information for the entire head more efficiently.

[0043] The present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made within the scope of the present invention. For example, it is possible to add other steps to the head shape measurement method of this embodiment, or to change the layout of the correction screen shown in Figure 5, or make other changes as appropriate. [Industrial applicability]

[0044] This invention can be suitably used to more efficiently manufacture wigs that are suitable for the wearer. [Explanation of Symbols]

[0045] 1 Head measurement cap 11 Hair area boundary 12 Ear section resection part 2. Portable 3D scanner 3 Shape information correction device 4 Ear covering bag

Claims

1. A method for measuring the shape of the head for manufacturing a wig, The head of the person wearing the wig is covered with a head measurement cap. After attaching the ear covering bag to the wearer's ear, or after placing the head measurement cap over the wearer, cutting it to form an ear area cutout at a position corresponding to the wearer's ear, a portable three-dimensional scanner is used to acquire three-dimensional shape information of the wearer's head covered by the head measurement cap. The portable three-dimensional scanner transmits the three-dimensional shape information to the shape information correction device. The shape information correction device performs a correction process on the three-dimensional shape information to make it smaller or larger in order to adjust for errors based on the thickness of the hair on the wearer's head or the thickness of the wig attachment pins. A method for measuring the shape of the head, characterized by the features described above.

2. The head measurement cap is transparent or translucent. Prior to acquiring the aforementioned three-dimensional shape information, A hair area boundary line indicating the wig area is drawn on the head measurement cap, The three-dimensional shape information includes the hair region boundary line. The method for measuring the shape of the head according to claim 1, characterized in that it is a method for measuring the shape of the head.

3. The method for measuring the shape of the head according to claim 1 or 2, characterized in that the ear covering bag has a color that is not captured as three-dimensional shape information by the portable three-dimensional scanner.

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