JP2015049378A - Measurement assist device and measurement assist method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and highly accurately calibrate a captured image for measuring parameters for spectacles.SOLUTION: A measurement assist device 1 used when measuring parameters for spectacles of a subject wearing a spectacle frame includes: a first member 10 that is disposed at a place having a prescribed relationship with at least one of the spectacle frame and the face of the subject; a second member 20 that has an imaging object surface 21 imaged along with the face of the subject in a state of wearing the spectacle frame, for measuring the parameters for spectacles, and that is formed by forming a measurement reference scale 22 having a prescribed size, on the imaging object surface 21; and a connection part 30 that connects the first member 10 and the second member 20 such that the position of the second member 20 relative to the first member 10 can be moved.

Description

  The present invention relates to a measurement auxiliary tool and a measurement auxiliary method used when measuring spectacle wearing parameters.

  In general, the production of spectacle lenses requires spectacle wearing parameters measured by a spectacle wearer wearing a spectacle frame. The spectacle wearing parameters include a corneal vertex distance, a frame forward tilt angle, a fitting point position, a pupil distance, a frame warp angle, and the like.

  The measurement of the spectacle wearing parameters is performed using, for example, a dedicated spectacle wearing parameter measuring device. As the spectacle wearing parameter measuring device, after positioning the face of the spectacle wearer who is the subject, the face side surface and the face front of the subject are imaged, and various spectacle wearing parameters are based on the image as the imaging result. There is one that is configured to calculate and calculate (see, for example, Patent Document 1).

Japanese Patent No. 5013930

In the spectacle wearing parameter measurement device disclosed in Patent Document 1, it is necessary to position the subject's face in a state where the subject's chin is placed on the chin rest and the forehead is placed against the forehead support. Therefore, some subjects may feel cramped when measuring the spectacle wearing parameters.
In order to solve this, for example, it is conceivable that the subject's face side face and front face are imaged while the subject's face is in a natural posture without positioning the subject's face. However, in this case, since the distance between the position of the subject's face and the camera unit that performs imaging becomes uncertain, the size of the object on the captured image cannot be specified only by the magnification of the camera unit. . In other words, when positioning of the subject's face is unnecessary, any means for enabling calibration for associating the size of the object in the real space with the size of the object on the captured image. Is required.
However, even if calibration is performed for each of the image of the face side and the image of the face of the subject, the calibration means causes a complicated apparatus configuration and a complicated measurement process. It is not desirable to be.

  Accordingly, an object of the present invention is to provide a measurement assisting tool and a measurement assisting method that can easily and accurately perform calibration related to a captured image for measurement of spectacle wearing parameters. To do.

The present invention has been devised to achieve the above object.
A first aspect of the present invention is a measurement assisting tool used when measuring a spectacle wearing parameter of a subject wearing a spectacle frame, and having a predetermined relationship with at least one of the spectacle frame or the subject's face A first member disposed on the surface of the subject, and a surface to be imaged together with the face of the subject wearing the spectacle frame for the measurement of the spectacle wearing parameters, and measuring a predetermined size on the surface to be imaged A second member formed with a reference scale, and a connecting portion for connecting the first member and the second member so that the relative position of the second member with respect to the first member is movable. It is a measurement aid characterized by comprising.
According to a second aspect of the present invention, in the measurement assisting tool according to the first aspect, the imaging surface of the second member is imaged together with the face side surface of the subject at a position where the second member is moved. And a position where the imaged surface of the second member is imaged together with the front face of the subject's face.
According to a third aspect of the present invention, in the measurement auxiliary tool according to the first or second aspect, the spectacle wearing parameter includes a distance between corneal apexes when the subject wears the spectacle frame, and the state And at least one of a fitting point position and a pupillary distance.
According to a fourth aspect of the present invention, in the measurement aid according to any one of the first to third aspects, the first member and the second member are formed in a plate shape, and the connecting portion is The first member and the second member are configured by a hinge mechanism that enables rotation within a predetermined angle range.
A fifth aspect of the present invention is a measurement assisting method used when measuring spectacle wearing parameters of a subject wearing a spectacle frame, and the relative position of the second member with respect to the first member can be moved. And a measurement reference scale having a predetermined size on the surface to be imaged of the second member of the measurement auxiliary tool. The second member connected to the first member, the first member in the measurement auxiliary tool is disposed at a predetermined relationship with at least one of the spectacle frame or the face of the subject, The measurement reference scale on the image pickup surface included in the image pickup result obtained by positioning the image pickup surface together with either the face side or the face front of the subject. The relative position of the second member with respect to the first member while calibrating the size of the imaging result based on the image and maintaining the positional relationship between at least one of the eyeglass frame or the face of the subject and the first member And the second member is positioned so as to be imaged together with either the face side surface or the face front, and the measurement reference scale on the imaged surface included in the imaging result obtained in that state This is a measurement auxiliary method characterized by performing dimension calibration of the imaging result based on the above.

  According to the present invention, when measuring spectacle wearing parameters, it is possible to easily and accurately perform calibration relating to a captured image for the measurement.

It is explanatory drawing which shows the specific example of a spectacles wearing parameter. It is explanatory drawing which shows the structural example of the measurement auxiliary tool in one Embodiment of this invention. It is explanatory drawing which shows a specific example of the usage condition of the measurement auxiliary tool in one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Here, description will be made with the following categories.
1. 1. Outline of measuring aid 2. Specific examples of spectacle wearing parameters 3. Configuration example of measurement auxiliary tool 4. Procedure of measurement assisting method using measurement assisting tool Effects of the present embodiment 6. Modified example

<1. Overview of measurement aids>
First, an outline of the measurement aid will be described.
The measurement auxiliary tool described in the present embodiment is used when measuring spectacle wearing parameters of a subject wearing a spectacle frame. More specifically, in order to measure the spectacle wearing parameters, when photographing the face side and front of the subject wearing spectacle frames (glass wearer), the image is taken together with the face side and front of the face. Thus, it is used to enable calibration (calibration) that associates the size of an object in real space with the size of the object on a captured image.

<2. Specific examples of spectacle wearing parameters>
Here, the spectacle wearing parameters measured in the present embodiment will be described.
FIG. 1 is an explanatory diagram illustrating a specific example of spectacle wearing parameters.

  The spectacle wearing parameters measured in the present embodiment include the corneal apex distance, the forward frame tilt angle, the fitting point position, and the interpupillary distance when the subject wears the spectacle frame.

  As shown in FIG. 1 (a), the distance between the corneal vertices is the distance of the subject on the far visual axis A when the far visual axis A is the visual axis when the subject (glasses wearer) sees far away. This is the distance CVD from the corneal apex of the eyeball E to the inner surface of the spectacle lens L.

  The frame forward tilt angle generally refers to an angle formed by the temple and the rim of the spectacle frame. In the present embodiment, as shown in FIG. 1A, on the outer surface of the distance visual axis A and the spectacle lens L. This is the angle α formed by the orthogonal straight line L1 and the tangent L2 on the outer surface of the spectacle lens L on the far visual axis A.

  As shown in FIG. 1B, the fitting point position is a distance FP from the datum line (horizontal line located at the center of the lens vertical width) D to the fitting point (the position of the pupil of the subject).

  As shown in FIG. 1B, the interpupillary distance is a distance PD between the centers of the left and right eyes when the subject looks far away. In this embodiment, the inter-pupil distance PD includes a right-eye monocular pupil distance PDR that is a distance from the pupil center of the right eye to the center of the bridge of the spectacle frame, and a center from the pupil center of the left eye to the center of the bridge of the spectacle frame. It is assumed that the left eye monocular pupillary distance PDL, which is a distance, is included.

  These spectacle wearing parameters are only specific examples in the present embodiment. That is, the spectacle wearing parameters are not limited to these, as long as at least one of these parameters is included, and other parameters may be included. Other than these, for example, a frame warp angle, a distance between near vision cornea vertices, a distance between near vision pupils, an eyeball rotation angle, and the like can be given.

<3. Configuration example of measuring aid>
Next, a configuration example of a measurement auxiliary tool used when measuring spectacle wearing parameters will be described.
FIG. 2 is an explanatory view showing a configuration example of a measurement auxiliary tool in one embodiment of the present invention.

  As shown in FIG. 2, the measurement auxiliary tool 1 described in the present embodiment includes a first member 10, a second member 20, and a connecting portion 30.

(First member)
The first member 10 is formed of, for example, a plate-like material having a rectangular shape (for example, a rectangular shape), and is arranged at a predetermined relationship with at least one of the face of the subject or the spectacle frame worn by the subject. It is what is done. Here, “arranged at a position having a predetermined relationship” means being arranged so as to maintain the predetermined relationship at the position. The “predetermined relationship” refers to a positional relationship set in advance so as to be suitable for measurement of spectacle wearing parameters. As one specific example, a temple of a spectacle frame worn by the subject on the subject's dominant eye side. Or a relationship located in the vicinity of the temple. However, the example given here is only one specific example. If the positional relationship is set in advance so as to be suitable for measurement of spectacle wearing parameters, the positional relationship in contact with the rim of the spectacle frame or the face of the subject. Other examples such as a relationship located in the vicinity of can also fall under the “predetermined relationship”. Such arrangement at the “predetermined position” may be performed by configuring the first member 10 so as to be hooked on the temple of the spectacle frame, or the first member 10 may be attached with an attachment such as a clip. It may be performed by attaching to the temple of the spectacle frame by using, or may be performed by attaching the first member 10 to the temple of the spectacle frame. Further, instead of being attached to the temple of the spectacle frame, the measurer of spectacle wearing parameters may be performed by holding the first member 10 by hand. That is, the support fixing mode of the first member 10 is not particularly limited.
In such support and fixing, it is desirable that the first member 10 is formed to be lightweight using, for example, a resin material.

(Second member)
The second member 20 is formed of, for example, a plate-like material having a rectangular shape (for example, a rectangular shape) having a planar shape equivalent to that of the first member 10. And on one surface side of the plate-like material, there is an imaged surface 21 that is imaged together with the face of the subject wearing the spectacle frame for measuring spectacle wearing parameters. A measurement reference scale 22 having a predetermined size is formed on the imaging surface 21 as will be described in detail later.
Similarly to the first member 10, the second member 20 is preferably formed to be lightweight using, for example, a resin material.

(Connecting part)
The connecting part 30 connects the first member 10 and the second member 20. However, the connecting portion 30 allows the first member 10 and the second member 20 to move so that the relative position of the second member 20 with respect to the first member 10 can be moved and the relative position can be maintained at an arbitrary position. Link. As used herein, the “arbitrary position” includes a position where the imaged surface 21 of the second member 20 is imaged together with the face side of the subject and an imaged surface 21 of the second member 20 as will be described in detail later. The position imaged together with the front face of the subject is assumed to be included.
In order to realize such a connection mode with a simple configuration, the connection portion 30 is provided by a hinge mechanism that allows the first member 10 and the second member 20 to rotate within a predetermined angle range (see arrow R in the figure). It is configured. The hinge mechanism is arranged at one end edge of the rectangular plate-like first member 10 and second member 20. As a result, the first member 10 and the second member 20 are connected via the connecting portion 30 formed of a hinge mechanism, and the angle between the first member 10 and the second member 20 is changed around the connecting axis of the hinge mechanism. . Moreover, if it is a hinge mechanism, the relative position of the 1st member 10 and the 2nd member 20 can move by adjustment of the fitting dimension of the connecting shaft which comprises the said hinge mechanism, and its bearing part, and It is possible to easily realize a mechanism that can maintain the state after movement at an arbitrary position.
In addition, about the hinge mechanism which comprises the connection part 30, it is desirable to be lightly formed, for example using the resin material similarly to the 1st member 10 and the 2nd member 20, except a connection shaft.

(Measuring scale)
In the measurement auxiliary tool 1 having the above-described configuration, the measurement reference scale 22 is formed on the imaging target surface 21 of the second member 20. The measurement reference scale 22 is used as a reference for performing calibration at the time of spectacle wearing parameter measurement, and is configured by a figure of a predetermined size. If the figure has a predetermined size (that is, the figure on the imaged surface 21 is known), the measurement reference scale 22 may extend in a one-dimensional direction, for example. What consists of the combination of the figure extended on each direction of two dimensions on 21 is desirable. As shown in the figure, the measurement reference scale 22 according to the present embodiment includes a graphic portion in which four line segments are arranged in a rectangular shape on a surface to be imaged 21 having a rectangular planar shape, and three pieces so as to surround the graphic portion. It is configured by combining a graphic part in which line segments are arranged in a U-shape. Thereby, the measurement reference scale 22 in the present embodiment includes at least two L-shaped graphic portions having long sides and short sides extending in two-dimensional directions. Moreover, these graphic parts are in a positional relationship in which corresponding long sides and short sides are parallel to each other.

  The figure constituting the measurement reference scale 22 is given a color that can ensure the contrast with the ground color of the imaged surface 21 so that the figure can be recognized on the captured image. Specifically, for example, if the ground color of the imaging surface 21 is white, it is conceivable that the measurement reference scale 22 is configured by a figure such as black, blue, or red.

  It should be noted that the measurement reference scale 22 mentioned here is merely a specific example, and may be configured by other graphic patterns as long as it is configured by a graphic of a predetermined size (that is, the size is known). .

<4. Procedure of measurement assistance method using measurement aids>
Next, the procedure of the measurement assistance method performed using the measurement aid 1 having the above-described configuration will be described.
FIG. 3 is an explanatory diagram showing a specific example of how the measurement auxiliary tool is used in one embodiment of the present invention.

  The measurement auxiliary tool 1 is used as described below when measuring the spectacle wearing parameters of the subject wearing the spectacle frame F. Here, after imaging the face side surface SF of the subject wearing the spectacle frame F and determining the inter-corneal apex distance CVD and the frame forward tilt angle α among the spectacle wearing parameters, the face front FF of the subject is calculated. An example will be described in which imaging is performed to obtain the fitting point position PD and the inter-pupil distance PD among the spectacle wearing parameters.

(When imaging the subject's face)
For example, when imaging the face side surface SF of the subject wearing the spectacle frame F, first, the measurement auxiliary tool 1 is closed, that is, the second axis is centered on the connection axis of the hinge mechanism constituting the connection portion 30. The one member 10 and the second member 20 are folded so as to overlap (see, for example, FIG. 2A). Then, with the first member 10 and the second member 20 folded, the first member 10 on the subject's dominant eye side and at least one of the subject's face or the spectacle frame F worn by the subject It is placed at a predetermined position. More specifically, in a state in which the image capturing surface 21 of the second member 20 faces the outer side (opposite to the subject's face side) while the connecting portion 30 is positioned on the rim R side of the spectacle frame F, The first member 10 is disposed. These operations are performed by a measurer of spectacle wearing parameters (for example, a store clerk of a spectacle store).

As a result, as shown in FIG. 3A, the measurement auxiliary tool 1 has the imaging target surface 21 of the second member 20 extending in the direction along the temple T of the spectacle frame F and the short side thereof. Is positioned in a state in which it can be imaged on the side surface of the subject's face in a posture extending in a direction perpendicular to this.
At this time, it is conceivable that the imaging surface 21 is arranged so that one end edge thereof coincides with the position of the corneal apex of the eyeball E of the subject. One end edge of 21 may be separated from the position of the corneal apex. In the example shown in the figure, the surface to be imaged 21 is located in the vicinity of the temple T of the spectacle frame F and away from the temple T. However, the present invention is not limited to this. 21 may be arranged so as to contact the temple T of the spectacle frame F.

  After the imaged surface 21 is positioned on the side of the subject's face, the face of the subject wearing the spectacle frame F together with the measurement reference scale 22 formed on the imaged surface 21 of the measurement assisting tool 1 is then used. An image of the side surface SF is taken. Since the imaging at this time does not require positioning of the face of the subject, it has an imaging function and an information processing function instead of a conventional spectacle wearing parameter measurement device (see, for example, Patent Document 1) having a large-scale configuration. While using an imaging camera or the like that can transfer data to a portable terminal device (for example, a tablet-type terminal) or a computer device, it can be performed in a natural posture for the subject. Hereinafter, the imaging function, imaging camera, and the like of the portable terminal device used for imaging in this embodiment are simply referred to as “camera unit”. Note that imaging by the camera unit is performed by a measurer of spectacle wearing parameters (for example, a store clerk of a spectacle store).

When taking an image, it is not necessary to position the subject's face, so the face side surface SF may tilt without facing the camera unit. Therefore, in imaging, for example, a rectangular guide frame is displayed in the finder for imaging, and the rectangular portion of the measurement reference scale 22 formed on the imaging target surface 21 is aligned with the guide frame. It is conceivable to perform imaging when the rectangular portion is aligned with the guide frame. This is because the subject's face side surface SF and the imaging target surface 21 of the measurement auxiliary tool 1 can be imaged without tilting.
For example, when the imaged surface 21 is tilted without facing the camera unit, the rectangular portion of the measurement reference scale 22 on the imaged surface 21 is distorted in the viewfinder and is no longer rectangular. It will not match the guide frame in the viewfinder. That is, if the rectangular portion of the measurement reference scale 22 matches the guide frame in the finder, it can be said that the imaging target surface 21 is in a state of facing the camera unit. An imaging result of the subject's face side surface SF in a state where there is no inclination is obtained.
At this time, if the measurement reference scale 22 on the imaged surface 21 is composed of a combination of figures extending in the two-dimensional directions on the imaged surface 21, There can be no inclination.
In addition, if the two-dimensional figure extending in each direction includes at least two L-shaped figure parts, the guide frame in the finder should also correspond to this, so that it should be matched in the finder. Therefore, it is easy to align the measurement reference scale 22 with the guide frame, and as a result, it is possible to expect higher accuracy of inclination removal when imaging.

  Based on the imaging result obtained in this way, the information processing function in the portable terminal device or computer device that acquired the imaging result is the spectacle wearing parameter to be measured on the image that is the imaging result. The corneal apex distance CVD and the frame forward tilt angle α are determined. Regarding how to obtain the corneal apex distance CVD and the frame forward tilt angle α on the captured image, for example, specify the corneal apex position and the upper end position and the lower end position of the rim R of the spectacle frame F on the captured image. Although it is possible to calculate by recognizing the distance obtained by appropriately connecting the points as necessary, the present invention is not limited to this, and other known calculation methods may be used.

  At this time, however, at least the corneal apex distance CVD needs to be calibrated to associate the size in the real space with the size in the captured image in order to obtain it on the captured image. However, the obtained captured image includes an image of the measurement reference scale 22 formed on the imaging target surface 21 of the measurement auxiliary tool 1. The measurement reference scale 22 is configured by a graphic of a predetermined size, and the size of the graphic (that is, the size in real space) is known. Therefore, the information processing function that performs processing on the captured image performs calibration that associates the size in the real space with the size on the captured image using any of the graphic parts constituting the measurement reference scale 22. It is possible to perform scale conversion on the captured image.

  It is desirable that the graphic portion of the measurement reference scale 22 used for calibration has a certain size. This is to increase the accuracy of calibration. For example, when imaging the imaging target surface 21 with the imaging target surface 21 of the measurement auxiliary tool 1 facing the distance of about 400 mm from the camera unit using a camera unit having 12 million pixels, If the graphic portion of the measurement reference scale 22 used for calibration has a size (length) of 60 mm or more, the length measurement variation on the captured image of the graphic portion can be suppressed to within ± 0.3 mm. . However, it has been found that if it is smaller than that, the measurement variation becomes large. Therefore, it is desirable that the graphic portion of the measurement reference scale 22 has a certain size (for example, a size of 60 mm or more).

(When imaging the front of the subject's face)
Thereafter, when imaging the face front FF of the subject wearing the spectacle frame F, the position where the first member 10 of the measurement auxiliary tool 1 is disposed (that is, at least one of the face of the subject or the spectacle frame F). The second member 20 is moved around the connecting shaft of the hinge mechanism that constitutes the connecting portion 30 of the measurement assisting tool 1 while maintaining the predetermined position. Then, the measurement auxiliary tool 1 is in an open state, that is, a state in which the first member 10 and the second member 20 form an angle of, for example, about 90 ° ± 20 ° with the connecting portion 30 as a fulcrum (for example, FIG. 2B). Keep that state. The movement of the second member 20 is performed by, for example, a spectacle wearing parameter measurer (for example, a store clerk at a spectacle store).

Thereby, as shown in FIG. 3 (b), the measurement assisting tool 1 has the imaging target surface 21 of the second member 20 extending in the direction along the datum line D of the spectacle frame F and the short side thereof. In such a posture that the side extends in a direction perpendicular to the side, it is positioned in a state where imaging can be performed on the front side of the subject's face.
At this time, the imaged surface 21 is positioned on the one edge side of the imaged surface 21 when one end edge of the imaged surface 21 is aligned with the position of the corneal apex of the eyeball of the subject when the subject's face side surface SF is imaged. Since the 2nd member 20 moves centering | focusing on the connection part 30, after the movement, it will be located on the plane which can be seen on the same plane as this and the corneal vertex of a test subject's eyeball.

  After the imaged surface 21 is positioned on the front side of the subject's face, the face of the subject wearing the spectacle frame F together with the measurement reference scale 22 formed on the imaged surface 21 of the measurement auxiliary tool 1 is then used. An image of the front FF is taken. As for the imaging at this time, as in the case of the above-described face side surface SF, since it is not necessary to position the face of the subject, the spectacle wearing parameter measuring device (see, for example, Patent Document 1) having a large structure is not used. It is possible to perform the posture in a natural posture for the subject while using a camera unit operated by a wearer measuring person (for example, a store clerk at a spectacle store).

  When imaging, it is not necessary to position the subject's face, and the face front FF may tilt without facing the camera unit. Therefore, in imaging, similarly to the case of the face side surface SF described above, the imaging target surface 21 faces the camera unit using a rectangular guide frame displayed in the finder for imaging. It can be considered that the subject's front face FF and the imaging target surface 21 of the measurement auxiliary tool 1 are imaged in a state (that is, in a state where there is no inclination).

  Based on the imaging result obtained in this way, the information processing function in the portable terminal device or computer device that acquired the imaging result is the spectacle wearing parameter to be measured on the image that is the imaging result. The fitting point position FP and the inter-pupil distance PD are obtained. Regarding how to obtain the fitting point position FP and the inter-pupil distance PD on the captured image, for example, the pupil center position and the upper end position and the lower end position of the rim R of the spectacle frame F are specified on the captured image. However, the present invention is not limited to this, and other known calculation methods may be used.

  Also at this time, calibration (calibration) that associates the size in the real space with the size in the captured image is necessary. This calibration can be performed in the same manner as in the case of the face side surface SF described above, since the image of the measurement reference scale 22 on the surface to be imaged 21 is included in the captured image.

  In this embodiment, the case where the face front side FF is subsequently imaged after the subject's face side surface SF is imaged has been described as an example. However, the order may be reversed. Even if it is a case where it carries out conversely, the measurement auxiliary tool 1 keeps the position where the first member 10 is arranged, and moves the second member 20 with the connecting portion 30 as a fulcrum, so that the face side surface SF and It is possible to correspond to each imaging of the face front FF.

<5. Effects of this embodiment>
According to the measurement auxiliary tool 1 described in the present embodiment and the measurement auxiliary method performed using the same, the following effects can be obtained.

In the measurement auxiliary tool 1 of the present embodiment, the first member 10 is disposed at a predetermined relationship with the eyeglass frame F or at least one of the subject's face, and the second member 20 connected thereto is imaged together with the subject's face. A measurement reference scale 22 is formed on the imaged surface 21. Therefore, if the measurement reference scale 22 on the imaging target surface 21 is used, it is possible to perform calibration for associating the size of the object in the real space with the size of the object on the captured image. Become. In other words, even when spectacle wearing parameters are measured based on the imaging results of the subject's face, there is no need to position the subject's face, and the subject does not feel cramped and undergoes calibration. This makes it possible to accurately measure the spectacle wearing parameters. Thus, the measurement auxiliary tool 1 of this embodiment functions as a means for enabling calibration.
Moreover, the measurement auxiliary tool 1 of the present embodiment is the first member even when a plurality of imaging results (for example, an image of the face side surface SF and an image of the face front surface FF) are necessary for measuring the spectacle wearing parameters. The measurement reference scale 22 on the imaging target surface 21 is included in each of the plurality of imaging results simply by moving the relative position of the second member 20 with respect to the first member 10 while maintaining the position where the 10 is disposed. It becomes possible. That is, it is not necessary to prepare separate means for dealing with a plurality of imaging results, and if one measurement auxiliary tool 1 is prepared, it is possible to deal with a plurality of imaging results only by moving the position of the second member 20. Therefore, the means for calibration is simple, and the measurement process of the spectacle wearing parameters is not complicated, and the convenience in the measurement process can be improved. Furthermore, since it is possible to deal with a plurality of imaging results simply by moving the position of the second member 20, even when a plurality of imaging results are required, the measurement auxiliary tool 1 is replaced (reattached) for that purpose. It can be said that the convenience of the measurement process can be improved in this respect as well.
As described above, according to the measurement auxiliary tool 1 of the present embodiment, when measuring the spectacle wearing parameters, it is possible to easily and accurately perform calibration relating to a captured image for the measurement.

  In particular, as described in the present embodiment, the imaging surface 21 of the second member 20 of the measurement auxiliary tool 1 is at a position where it is imaged together with at least the face side surface SF of the subject and a position where it is imaged together with the front face FF of the subject. If it is arranged selectively at both positions, it is very suitable for measuring each of corneal apex distance CVD, frame forward tilt angle α, fitting point position FP and interpupillary distance PD as spectacle wearing parameters. Become. That is, each of these spectacle wearing parameters is indispensable for the design, manufacture and sale of the spectacle lens. However, according to the measurement aid 1 of the present embodiment, one item for each of these spectacle wearing parameters is used. If two measuring aids 1 are prepared, each measurement can be handled. Therefore, since only one measurement auxiliary tool 1 is prepared, each measurement can be simplified, and as a result, it is very suitable for performing each measurement.

  Moreover, as for the measurement auxiliary tool 1 of this embodiment, the connection part 30 which connects the 1st member 10 and the 2nd member 20 is comprised by the hinge mechanism. Therefore, even if it is a case where the relative position of the 1st member 10 and the 2nd member 20 is connected so that movement is possible, the connection mode can be realized by simple composition. Moreover, with the hinge mechanism, it is possible to easily realize a mechanism in which the relative position between the first member 10 and the second member 20 can be moved and the state after the movement can be maintained at an arbitrary position. It becomes.

  Moreover, the measurement auxiliary tool 1 of the present embodiment is used with the first member 10 disposed on the dominant side of the subject for the convenience of measuring the corneal apex distance CVD when measuring the spectacle wearing parameters. Whether the subject's dominant eye is the right eye or the left eye depends on the subject. On the other hand, in the measurement auxiliary tool 1 of the present embodiment, the connecting part 30 constituted by the hinge mechanism is arranged on one end edge of the rectangular plate-like first member 10 and the second member 20, so that the measurement By simply reversing the top-and-bottom direction when the assisting tool 1 is placed, it is possible to deal with both cases where the subject's dominant eye is the right eye and the left eye. Therefore, regardless of which side the subject's dominant eye is on, only one measurement auxiliary tool 1 needs to be prepared. Compared to the case where the subject is individually prepared for each case, the spectacle wearing parameter measurement is performed. This simplifies and is very suitable for measuring the spectacle wearing parameter.

<6. Modified example>
While embodiments of the present invention have been described above, the above disclosure is intended to illustrate exemplary embodiments of the present invention. That is, the technical scope of the present invention is not limited to the exemplary embodiments described above.

For example, in this embodiment, although the case where both the 1st member 10 and the 2nd member 20 which comprise the measurement auxiliary tool 1 were formed of the rectangular plate-shaped material was mentioned as an example, this invention is shown to this. It is not limited. That is, the first member 10 is formed in any shape or member as long as the first member 10 is arranged at a predetermined relationship with at least one of the face of the subject or the spectacle frame F worn by the subject. Also good. The second member 20 has an imaging surface 21 and any shape or shape as long as the second member 20 is connected to the first member 10 so that the relative position with respect to the first member 10 is movable. It may be formed of a member.
The same applies to the measurement reference scale 22 formed on the imaging surface 21 of the second member 20. That is, the measurement reference scale 22 is configured to include at least a graphic part of a predetermined size, and is preferably implemented as long as it is composed of a combination of figures extending in each direction in two dimensions on the imaged surface 21. It is not based on the rectangular figure pattern as exemplified in the form, but it may be, for example, a triangular figure pattern or a polygonal figure pattern of pentagon or more, or a figure pattern formed by combining separated line segment figures. .

  Further, for example, in the present embodiment, the case where the first member 10, the second member 20, and the connecting portion 30 constituting the measurement auxiliary tool 1 are mainly formed of a resin material has been described as an example. It is not limited to. If the measurement auxiliary tool 1 is made of a resin material and is light in weight, it is very preferable in that it can be easily and reliably supported and fixed at a predetermined relationship position, but a material other than resin (for example, a metal material) is preferable. Even if it is formed, it is feasible to perform support and fixation at a predetermined relationship position, and even in such a case, simplification of the spectacle wearing parameter measurement as described above can be achieved.

  For example, in this embodiment, although the case where the connection part 30 which connects the 1st member 10 and the 2nd member 20 was comprised by the hinge mechanism was mentioned as an example, this invention is limited to this. is not. That is, if the connection part 30 connects the 1st member 10 and the 2nd member 20 so that the relative position of the 2nd member 20 with respect to the 1st member 10 can move, mechanisms other than a hinge mechanism ( For example, a flexible joint mechanism) may be used.

  DESCRIPTION OF SYMBOLS 1 ... Measurement auxiliary tool, 10 ... 1st member, 20 ... 2nd member, 21 ... Imaging surface, 22 ... Measurement reference | standard scale, 30 ... Connection part

Claims (5)

A measurement aid used when measuring spectacle wearing parameters of a subject wearing a spectacle frame,
A first member disposed in a predetermined relationship with at least one of the eyeglass frame or the subject's face;
A second imaging surface having a surface to be imaged together with the face of the subject wearing the eyeglass frame for measuring the eyeglass wearing parameter, and a measurement reference scale having a predetermined size formed on the surface to be imaged; Members,
A connecting portion that connects the first member and the second member such that the relative position of the second member to the first member is movable;
A measuring aid characterized by comprising. The position where the second member is moved includes the position where the imaged surface of the second member is imaged together with the face side of the subject, and the imaged surface of the second member together with the face front of the subject. The measurement auxiliary tool according to claim 1, further comprising: a position to be imaged. The spectacle wearing parameters include a corneal vertex distance in a state where the subject wears the spectacle frame and at least one of a fitting point position or a pupil distance in the state. The measuring aid according to 1 or 2. The first member and the second member are formed in a plate shape,
The said connection part is comprised by the hinge mechanism which enables rotation of said 1st member and said 2nd member within a predetermined angle range. The one of Claim 1 characterized by the above-mentioned. Measuring aid. A measurement assisting method used when measuring a spectacle wearing parameter of a subject wearing a spectacle frame,
Preparing a measurement auxiliary tool in which the first member and the second member are connected via a connecting portion so that the relative position of the second member with respect to the first member is movable; A measurement reference scale of a predetermined size is formed on the imaging surface of the second member,
The first member in the measurement aid is disposed at a predetermined position with at least one of the spectacle frame or the subject's face,
The second member connected to the first member is positioned such that the imaged surface is imaged together with either the face side surface or the face front of the subject, and is included in the imaging result obtained in that state Perform dimension calibration of the imaging result based on the measurement reference scale on the imaging surface,
The relative position of the second member relative to the first member is moved while maintaining the positional relationship between the first member and at least one of the eyeglass frame or the face of the subject, and the second member is moved to the side of the face or It is positioned so as to be imaged together with either one of the front faces of the face, and dimensional calibration of the imaging result is performed based on the measurement reference scale on the imaging target surface included in the imaging result obtained in that state. Characteristic measurement assisting method.

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