Method, program, computer, and hair evaluation system

Abstract

The present invention enhances the accuracy of hair evaluation. A method according to an embodiment of the present invention comprises: scanning an image of a prescribed range in a certain direction, the image being obtained by imaging the head of a user, and measuring a hair portion; detecting, by the scanning in the certain direction, an area in which the ratio of the hair portion to the image is the minimum; and determining, as the hair parting, the area in which the ratio of the hair portion to the image is the minimum.

Description

Technical Field

[0001] The present invention relates to a hair evaluation method, a program, a computer, and a hair evaluation system.

Background Art

[0002] Conventionally, in the confirmation of the effects of hair growth agents and hair tonics, it has been known to evaluate hair based on the number of hairs, the diameter of the hairs, etc. When evaluating hair, an image of the head being photographed may be used (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional method, a person visually determines the area for evaluating hair in the photographed image. Therefore, there may be a deviation between the area that should be originally evaluated and the area that is actually evaluated. As a result, it becomes impossible to accurately evaluate the hair.

[0005] Therefore, an object of the present invention is to improve the accuracy of hair evaluation.

Means for Solving the Problems

[0006] A method according to an embodiment of the present invention includes scanning an image of a predetermined range in which a user's head is photographed in a certain direction to measure a hair portion, detecting, by the scanning in the certain direction, an area in which the ratio of the hair portion in the image is the smallest, and determining the area in which the ratio of the hair portion is the smallest as a hair parting.

Effects of the Invention

[0007] According to the present invention, the accuracy of hair evaluation can be improved.

Brief Description of Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0010] <Explanation of Terms> · In this specification, the "hair part line" refers to the part where the hair is parted or the part where the hair is separated, and usually refers to the area that becomes the boundary when the hair is separated in opposite directions from each other. That is, the hair is separated in opposite directions from each other with the hair part line as the boundary. Note that "separated in opposite directions from each other" includes the case where the hair flow (the direction from the root of the hair to the tip of the hair) intersects the hair part line perpendicularly, and also includes the case where the hair flow intersects the hair part line obliquely. Later, an example of the hair part line will be described with reference to FIG. 9. Note that the hair part line may be a line created for the evaluation of the hair, or may be a naturally occurring line. · In this specification, the "hair coverage rate" refers to the ratio of the area occupied by the hair portion in the image. For example, if the diameters of the hairs are the same, it is estimated that the higher the number of hairs of the user, the larger the hair coverage rate. Also, for example, if the number of hairs is the same, it is estimated that the larger the diameter of the hairs of the user, the larger the hair coverage rate.

[0011] <Overall Configuration> The overall configuration will be described separately for Example 1 and Example 2.

[0012] <<Example 1>> FIG. 1 is an overall configuration diagram (Example 1) according to an embodiment of the present invention. The hair evaluation terminal 10 can acquire an image captured by the imaging device 20. Hereinafter, each will be described.

[0013] The hair evaluation terminal 10 is a computer for evaluating hair. The hair evaluation terminal 10 determines the hair part line in the image captured by the imaging device 20. Further, the hair evaluation terminal 10 can evaluate the hair using the hair part line. For example, the hair evaluation terminal 10 is a personal computer, a tablet terminal, a smartphone, or the like.

[0014] The imaging device 20 is a device for photographing hair. Specifically, the imaging device 20 photographs the user's head. For example, the imaging device 20 is a digital camera or the like.

[0015] <<Example 2>> FIG. 2 is an overall configuration diagram (Example 2) according to an embodiment of the present invention. The hair evaluation system 1 includes a hair evaluation terminal 10, an imaging device 20, and a hair evaluation server 30. The hair evaluation terminal 10 can acquire an image photographed by the imaging device 20. The hair evaluation terminal 10 and the hair evaluation server 30 can transmit and receive data to and from each other via an arbitrary network. Hereinafter, each will be described.

[0016] The hair evaluation terminal 10 transmits the image photographed by the imaging device 20 to the hair evaluation server 30. Also, the hair evaluation terminal 10 receives information on the hair parting from the hair evaluation server 30. Further, the hair evaluation terminal 10 can receive information on hair evaluation (for example, hair coverage rate) from the hair evaluation server 30. For example, the hair evaluation terminal 10 is a personal computer, a tablet terminal, a smartphone, or the like.

[0017] The imaging device 20 is a device for photographing hair. Specifically, the imaging device 20 photographs the user's head. For example, the imaging device 20 is a digital camera or the like.

[0018] The hair evaluation server 30 is a computer for evaluating hair. The hair evaluation server 30 receives, from the hair evaluation terminal 10, an image captured by the imaging device 20. Further, the hair evaluation server 30 determines a hair part in the image captured by the imaging device 20. Also, the hair evaluation server 30 transmits information on the hair part to the hair evaluation terminal 10. Furthermore, the hair evaluation server 30 can evaluate the hair using the hair part. In addition, the hair evaluation server 30 can transmit information on the hair evaluation (for example, hair coverage rate) to the hair evaluation terminal 10. For example, the hair evaluation server 30 is a server composed of one or more computers.

[0019] In FIGS. 1 and 2, the hair evaluation terminal 10 and the imaging device 20 have been described as separate devices, but the hair evaluation terminal 10 and the imaging device 20 may be implemented as one device (for example, a tablet terminal with a camera, etc.).

[0020] <Functional block> FIG. 3 is a functional block diagram of the hair evaluation terminal 10 (in the case of Example 1 in FIG. 1) and the hair evaluation server 30 (in the case of Example 2 in FIG. 2) according to an embodiment of the present invention. As shown in FIG. 3, the hair evaluation terminal 10 and the hair evaluation server 30 can include an image acquisition unit 101, an angle correction unit 102, a hair identification unit 103, a measurement unit 104, a detection unit 105, a part determination unit 106, a range setting unit 107, and a hair evaluation unit 108. Also, the hair evaluation terminal 10 and the hair evaluation server 30 can function as the image acquisition unit 101, the angle correction unit 102, the hair identification unit 103, the measurement unit 104, the detection unit 105, the part determination unit 106, the range setting unit 107, and the hair evaluation unit 108 by executing a program.

[0021] The image acquisition unit 101 acquires an image captured by the imaging device 20. The image is an image in which the head of the user whose hair is to be evaluated is captured. The photographer captures a predetermined range of the user's head. For example, the predetermined range is a range visually determined by the photographer based on a mark on the user's scalp.

[0022] The angle correction unit 102 corrects the angle of a region (hereinafter also referred to as a "frame") of a predetermined shape and size in the image acquired by the image acquisition unit 101 and the angle of the image acquired by the image acquisition unit 101. Specifically, the angle correction unit 102 designates the angle (direction) of the hair part in the image captured by the imaging device 20. Note that the angle correction unit 102 can designate the angle of the hair part according to an instruction from an operator of the hair evaluation terminal 10 or the hair evaluation server 30 (an instruction based on the position of hair follicles, etc.), or can analyze the image to designate the angle of the hair part. Further, the angle correction unit 102 rotates the frame or the image so that the angle of the frame coincides with the angle of the hair part.

[0023] The hair identification unit 103 identifies the hair part in the image acquired by the image acquisition unit 101. The hair identification unit 103 can identify the hair part by binarizing the image acquired by the image acquisition unit 101.

[0024] The measurement unit 104 scans the image acquired by the image acquisition unit 101 in a certain direction to measure the hair part. Specifically, the measurement unit 104 measures the hair coverage rate within a region (frame) of a predetermined shape and size in the image.

[0025] The detection unit 105 detects a region in the image where the ratio of the hair part is the smallest (that is, the frame with the smallest hair coverage rate) by scanning in a certain direction by the measurement unit 104.

[0026] The parting determination unit 106 determines the region where the ratio of the hair part detected by the detection unit 105 is the smallest as the hair parting.

[0027] The range setting unit 107 sets the region including the hair parting as the region for evaluating the hair. The range setting unit 107 can set, as the region for evaluating the hair, a region obtained by adding an arbitrary region to the region determined as the hair parting.

[0028] The hair evaluation unit 108 evaluates the hair. For example, the hair evaluation unit 108 can display the evaluation result on the display device of the hair evaluation terminal 10.

[0029] Specifically, the hair evaluation unit 108 can evaluate the user's hair based on the hair portion in the area including the hair part. For example, the hair evaluation unit 108 can calculate the hair coverage rate of the user.

[0030] Specifically, the hair evaluation unit 108 can evaluate the change of the user's hair based on the time-series data of the hair portion in the area including the hair part. For example, the hair evaluation unit 108 can evaluate that the hair coverage rate of the user has increased, the hair coverage rate of the user has decreased, the hair coverage rate of the user has not changed, etc.

[0031] <Method> Hereinafter, the hair evaluation process will be described with reference to FIG. 4, and the angle correction process will be described with reference to FIG. 5.

[0032] <<Hair Evaluation Process>> FIG. 4 is a flowchart of the hair evaluation process according to an embodiment of the present invention.

[0033] In step 1 (S1), the image acquisition unit 101 acquires the image captured by the imaging device 20.

[0034] In step 2 (S2), the angle correction unit 102 corrects the angle of the region (frame) of a predetermined shape and a predetermined size in the image acquired in S1 and the angle of the image acquired in S1. Note that S2 may be omitted.

[0035] In step 3 (S3), the hair identification unit 103 identifies the hair portion in the image acquired in S1.

[0036] Note that the order of S2 and S3 may be reversed.

[0037] In step 4 (S4), the measurement unit 104 scans the image whose angle has been corrected in S2 in a certain direction to measure the hair portion.

[0038] In step 5 (S5), the detection unit 105 detects, by scanning in a certain direction in S4, the region where the ratio of the hair portion in the image is the smallest.

[0039] In step 6 (S6), the parting determination unit 106 determines, as the hair parting, the region where the ratio of the hair portion detected in S5 is the smallest.

[0040] In step 7 (S7), the range setting unit 107 sets, as the region for evaluating the hair, the region including the hair parting determined in S6.

[0041] In step 8 (S8), the hair evaluation unit 108 evaluates the user's hair based on the hair portion in the region set in S7.

[0042] <<Angle correction process>> FIG. 5 is a flowchart of the angle correction process (S2 in FIG. 4) according to an embodiment of the present invention.

[0043] In step 11 (S11), the angle correction unit 102 designates the angle of the hair parting in the image captured by the imaging device 20. Note that the angle correction unit 102 can designate the angle of the hair parting according to an instruction from the operator of the hair evaluation terminal 10 or the hair evaluation server 30 (an instruction based on the position of the hair follicles or the like), or can designate the angle of the hair parting by analyzing the image.

[0044] In step 12 (S12), the angle correction unit 102 rotates the frame or the image so that the angle of the region (frame) having a predetermined shape and a predetermined size in the image matches the angle of the hair parting designated in S11.

[0045] FIG. 6 is a transition diagram of the image according to an embodiment of the present invention.

[0046] First, the image acquisition unit 101 acquires the image captured by the imaging device 20. The image of [Shooting] in the upper left of FIG. 6 is the image acquired by the image acquisition unit 101.

[0047] Next, the image acquisition unit 101 converts the acquired image into a 32-bit black-and-white image. The image of [Converted to 32-bit Black-and-White] in the upper right of FIG. 6 is the image obtained by the image acquisition unit 101 converting the [Shooting] image into a 32-bit black-and-white image.

[0048] Next, the angle correction unit 102 specifies the angle of the hair part and corrects the angle. The image of [Specifying the Angle of the Parting] in the lower left of FIG. 6 is the image in which the angle correction unit 102 specifies the angle of the hair part. Note that the angle correction unit 102 can specify the angle of the hair part according to an instruction from the operator of the hair evaluation terminal 10 or the hair evaluation server 30 (an instruction based on the position of pores, etc.), or can specify the angle of the hair part by analyzing the image.

[0049] Note that the order of [Converted to 32-bit Black-and-White] and [Specifying the Angle of the Parting] may be reversed.

[0050] Next, the hair identification unit 103 identifies the hair part by binarization. The image of [Binarization] in the lower right of FIG. 6 is the image binarized by the hair identification unit 103.

[0051] FIG. 7 is a diagram for explaining the scanning according to an embodiment of the present invention. As shown in FIG. 7, the measurement unit 104 can move a rectangular frame having a long side along the hair part in the direction in which the hair is parted.

[0052] Here, the region for evaluating the hair will be described in detail. The range setting unit 107 can set, as the region for evaluating the hair, a region obtained by expanding the region determined as the hair part in a direction perpendicular to the hair part (in the example of FIG. 7, the region with additional regions on both long side sides).

[0053] Here, the angle correction will be described in detail. The angle correction unit 102 designates the angle of the hair part in the image captured by the imaging device 20 ([Designation of the angle of the part in FIG. 6]). Then, the angle correction unit 102 rotates the frame or the image so that the angle of the frame matches the angle of the hair part (in the example of FIG. 7, so that the long side of the frame is parallel to the hair part).

[0054] FIG. 8 is a diagram for explaining the designation of the angle of the part according to an embodiment of the present invention. The angle correction unit 102 can analyze the image to designate the angle of the hair part. Specifically, the angle correction unit 102 scans each of a plurality of ranges in a certain direction (in the example of FIG. 8, each of the three vertically long rectangular ranges is scanned in the vertical direction) for image analysis, and detects a region assumed to be the hair part (for example, a region determined based on a 32-bit black-and-white image. In the example of FIG. 8, the three regions indicated by arrows). The angle correction unit 102 sets the line connecting the detected regions (the solid line connecting the three regions in the example of FIG. 8) as the line indicating the angle of the hair part.

[0055] FIG. 9 is a diagram for explaining the hair part according to an embodiment of the present invention. The hair part may be the boundary when the hair flow (the direction from the root of the hair to the tip of the hair) intersects the hair part perpendicularly (in the case of (A) in FIG. 9), or when the hair flow intersects the hair part obliquely (greater than 0 degrees and less than 90 degrees) (when the hair flow is symmetric about the part as in (B) in FIG. 9, and when the hair flow is asymmetric about the part as in (C) in FIG. 9).

[0056] FIG. 10 is a diagram for explaining the hair coverage rate according to an embodiment of the present invention. As shown in FIG. 10, the region with the lowest hair coverage rate is determined as the hair part. The hair coverage rate increases as the distance from the region determined as the hair part increases (as moving in the "upper part of the image" direction in FIG. 10, or as moving in the "lower part of the image" direction in FIG. 10).

[0057] Figure 11 is a diagram for explaining the deviation in the direction perpendicular to the hair part. The three images of the head in Figure 11 are the same image. At the [reference position] on the right side of Figure 11, the frame is arranged at the reference position. At [-75 pixels] in the center of Figure 11, the frame is arranged at a position 75 pixels (0.5 mm) moved in the vertical direction (the Y-axis direction in Figure 11) on the scalp with respect to the hair part from the reference position. At [-150 pixels] on the left side of Figure 11, the frame is arranged at a position 150 pixels (1 mm) moved in the vertical direction (the Y-axis direction in Figure 11) on the scalp with respect to the hair part from the reference position.

[0058] At the [reference position], the hair coverage rate within the frame was 10.872 percent. At [-75 pixels], the hair coverage rate within the frame was 11.057 percent, and the ratio to the hair coverage rate at the [reference position] was 1.017. At [-150 pixels], the hair coverage rate within the frame was 11.655 percent, and the ratio to the hair coverage rate at the [reference position] was 1.072. Thus, even for the same image, when the frame was away from the hair part, the hair coverage rate increased.

[0059] Figure 12 is a diagram for explaining the diagonal deviation with respect to the hair part. At the [reference angle] in Figure 12, the frame is arranged at the reference angle. At [-10°] in Figure 12, the frame is arranged rotated diagonally (the Y-axis direction in Figure 12) by 10° on the scalp with respect to the hair part from the reference angle.

[0060] At the [reference angle], the hair coverage rate within the frame was 10.821 percent. At [-10°], the hair coverage rate within the frame was 11.543 percent, and the ratio to the hair coverage rate at the [reference angle] was 1.067. Thus, even for the same image, when the frame was diagonally displaced with respect to the hair part, the hair coverage rate increased.

[0061] <<Binarization>> FIG. 13 is a diagram for explaining binarization according to an embodiment of the present invention. In one embodiment of the present invention, when binarizing an image in which a user's head is photographed, the hair specifying unit 103 divides the image into a plurality of regions (for example, binarization region 1, binarization region 2, binarization region 3, etc. in FIG. 13; hereinafter referred to as binarization regions), and can perform binarization for each binarization region using a threshold value set for each binarization region. Details will be described below.

[0062] In the binarization process, pixels with a pixel value equal to or greater than the threshold value (locations assumed to be the scalp) are converted to white, and pixels with a pixel value less than the threshold value (locations assumed to be hair) are converted to black. However, in an image in which a user's head is photographed, depending on the amount of hair, the shadow caused by the overlapping of the hair may change the brightness of the scalp portion, resulting in false detection (that is, the scalp portion is falsely detected as the hair portion. Also, due to the influence of the darkened portion, the threshold value is set low (towards the black side), and light-colored hair in the bright portion may not be detected). Therefore, when binarizing the entire image at once (that is, with a single threshold value), there is a region where false detection occurs, so it is desirable to binarize each region using a threshold value suitable for each region.

[0063] In one embodiment of the present invention, the process of specifying the hair portion by binarization (step 3 in FIG. 4) can be performed for each binarization region in the image (note that by using the scanning frame (the frame in FIG. 7) as the binarization region, the process of measuring the hair coverage rate (step 4 in FIG. 4) may also be performed for each binarization region). Each binarization region and each threshold value may be specified and set by an operator of the hair evaluation terminal 10 or the hair evaluation server 30, or may be set by the hair evaluation terminal 10 or the hair evaluation server 30.

[0064] In this embodiment, in steps 5 and 6 of FIG. 4, the detection unit 105 and the parting determination unit 106 determine, from the results of measuring the hair coverage rate of each binarized region, the binarized region with the minimum hair coverage rate as the hair parting. Also, in steps 7 and 8 of FIG. 4, the range setting unit 107 and the hair evaluation unit 108 set, as the region for evaluating hair, a region obtained by adding an arbitrary region to the binarized region determined as the hair parting, and then evaluate the hair (calculate the hair coverage rate of the region for evaluating hair).

[0065] Note that in the image of FIG. 13 (image size (6000 pixels × 4000 pixels = 4.5 cm × 3.0 cm)), when the size of the binarized region is set to 2 / 3 of the number of vertical pixels of the image (2.0 cm), 1 / 2 of the number of vertical pixels of the image (1.5 cm), and 1 / 4 of the number of vertical pixels of the image (0.75 cm), it was found that there were many misdetected parts in the binarized region. On the other hand, when the size of the binarized region is set to 1 / 6 (0.5 cm) of the number of vertical pixels of the image and 1 / 20 (0.15 cm) of the number of vertical pixels of the image, it was found that the misdetected parts in the binarized region decreased. Thus, although the accuracy increases as the binarized region is made smaller, if it is made extremely small (for example, 10 pixels = 0.0075 cm, etc.), it is necessary to increase the number of times of performing binarization, and it is assumed that the operability deteriorates.

[0066] <Effect> As described above, in one embodiment of the present invention, the region with the minimum ratio occupied by the hair part is determined as the hair parting, and the hair is evaluated based on the hair part of the region including the hair parting. Therefore, there is no deviation caused by a person visually determining the region for evaluating the hair, and the hair can be correctly evaluated. Also, since the hair in the same region can always be evaluated, when evaluating the hair over time, the change in the hair can be correctly evaluated.

[0067] Note that while gradually changing the position where the hair is divided in opposite directions, an area where the ratio occupied by the hair portion is minimized is detected for each position, and an area where the ratio occupied by the hair portion is minimized among these areas may be determined as the hair parting. By using the smallest hair coverage rate among the minimum hair coverage rates for each position of a plurality of positions, it is possible to suppress the error of the hair coverage rate due to the deviation of the position where the hair is divided in opposite directions.

[0068] In one embodiment of the present invention, by providing a method for evaluating the treatment effect that can be implemented by external treatment (no need for hair cutting or special equipment), it is possible to contribute to the popularization of hair regeneration medicine.

[0069] <Hardware Configuration> FIG. 14 is a block diagram showing an example of the hardware configuration of a hair evaluation terminal 10 and a hair evaluation server 30 according to an embodiment of the present invention.

[0070] The hair evaluation terminal 10 and the hair evaluation server 30 include a CPU (Central Processing Unit) 1001, a ROM (Read Only Memory) 1002, and a RAM (Random Access Memory) 1003. The CPU 1001, the ROM 1002, and the RAM 1003 form a so-called computer.

[0071] Further, the hair evaluation terminal 10 and the hair evaluation server 30 may include an auxiliary storage device 1004, a display device 1005, an operation device 1006, an I / F (Interface) device 1007, and a drive device 1008. Note that each hardware of the hair evaluation terminal 10 and the hair evaluation server 30 is interconnected via a bus B.

[0072] The CPU 1001 is an arithmetic device that executes various programs installed in the auxiliary storage device 1004.

[0073] The ROM 1002 is a non-volatile memory. The ROM 1002 functions as a main memory device that stores various programs, data, etc. necessary for the CPU 1001 to execute various programs installed in the auxiliary storage device 1004. Specifically, the ROM 1002 functions as a main memory device that stores boot programs such as BIOS (Basic Input / Output System) and EFI (Extensible Firmware Interface).

[0074] The RAM 1003 is a volatile memory such as DRAM (Dynamic Random Access Memory) or SRAM (Static Random Access Memory). The RAM 1003 functions as a main memory device that provides a working area where various programs installed in the auxiliary storage device 1004 are expanded when executed by the CPU 1001.

[0075] The auxiliary storage device 1004 is an auxiliary storage device that stores various programs and information used when various programs are executed.

[0076] The display device 1005 is a display device that displays the internal states of the hair evaluation terminal 10 and the hair evaluation server 30.

[0077] The operation device 1006 is an input device through which an administrator of the hair evaluation terminal 10 and the hair evaluation server 30 inputs various instructions to the hair evaluation terminal 10 and the hair evaluation server 30.

[0078] The I / F device 1007 is a communication device that connects to a network and communicates with the hair evaluation terminal 10 and the hair evaluation server 30.

[0079] The drive device 1008 is a device for setting the storage medium 1009. The storage medium 1009 here includes media that optically, electrically, or magnetically record information, such as CD-ROMs, flexible disks, magneto-optical disks, etc. Further, the storage medium 1009 may include semiconductor memories that electrically record information, such as EPROM (Erasable Programmable Read Only Memory), flash memories, etc.

[0080] Note that various programs installed in the auxiliary storage device 1004 are installed, for example, when the distributed storage medium 1009 is set in the drive device 1008 and the various programs recorded on the storage medium 1009 are read by the drive device 1008. Alternatively, various programs installed in the auxiliary storage device 1004 may be installed by being downloaded from a network via the I / F device 1007.

[0081] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments described above, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

[0082] This international application claims priority based on Japanese Patent Application No. 2020-201190 filed on December 3, 2020, and the entire contents of No. 2020-201190 are incorporated herein by reference into this international application.

Explanation of Signs

[0083] 1 Hair evaluation system 10 Hair evaluation terminal 20 Imaging device 30 Hair evaluation server 101 Image acquisition unit 102 Angle correction unit 103 Hair identification unit 104 Measurement unit 105 Detection unit 106 Parting determination unit 107 Range setting unit 108 Hair evaluation unit 1001 CPU 1002 ROM 1003 RAM 1004 Auxiliary storage device 1005 Display device 1006 Operating device 1007 I / F device 1008 Drive device 1009 Storage medium

Claims

1. Scanning an image of a predetermined range in which the user's head is photographed in a certain direction to measure the hair portion, Detecting, by the scanning in the certain direction, a region in the image where the ratio of the hair portion is the smallest, Determining the region where the ratio of the hair portion is the smallest as the hair parting, A method comprising:

2. The method according to claim 1, wherein the hair is divided in opposite directions with the hair parting as a boundary.

3. The method according to claim 1 or 2, further comprising evaluating (excluding medical acts) the user's hair based on the hair portion in the region including the hair parting.

4. The method according to claim 3, further comprising evaluating (excluding medical acts) the change in the user's hair based on the time-series data of the hair portion in the region including the hair parting.

5. The measurement is performed by measuring the hair portion within a region of a predetermined shape and size in the image, The detection is performed by detecting a region in which the ratio of the hair portion is the smallest among regions of a predetermined shape and size in the image. The method according to any one of claims 1 to 4.

6. The method according to claim 5, further comprising correcting the angle of the region of the predetermined shape and size and the angle of the image.

7. The method according to any one of claims 1 to 6, further comprising specifying the hair portion in the image of the predetermined range in which the user's head is photographed by binarization.

8. The binarization is performed for each of the binarization regions by dividing the image of the predetermined range in which the user's head is photographed into a plurality of binarization regions and using a threshold value set for each binarization region. The method according to claim 7.

9. A computer A measurement unit that scans an image of a predetermined range in which the user's head is photographed in a certain direction to measure the hair portion, A detection unit that detects, by the scanning in the certain direction, a region in the image where the ratio of the hair portion is the smallest, A determination unit that determines the region where the ratio of the hair portion is the smallest as the hair parting A program for functioning as.

10. A measurement unit that scans an image of a predetermined range in which the user's head is photographed in a certain direction to measure the hair portion, A detection unit that detects, by the scanning in the certain direction, a region in the image where the ratio of the hair portion is the smallest, A determination unit that determines, as the hair part parting, an area where the ratio occupied by the hair part is minimized A computer comprising the same. **Claim 11** A hair evaluation system including a hair evaluation server and a hair evaluation terminal, wherein the hair evaluation server includes a measurement unit that scans an image of a predetermined range in which the user's head is photographed in a certain direction to measure the hair part, a detection unit that detects, by the scanning in the certain direction, an area where the ratio occupied by the hair part in the image is minimized, and a determination unit that determines, as the hair part parting, an area where the ratio occupied by the hair part is minimized, and the hair evaluation terminal transmits an image of a predetermined range in which the user's head is photographed to the hair evaluation server and receives information on the hair part parting from the hair evaluation server.

Images