JP2014042806A - Gaze line measuring method, gaze line measuring device, eyeball turning point measuring method and eye point measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gaze line measuring method capable of measuring a gaze ine with high accuracy in simple constitution.SOLUTION: A gaze line measuring method includes: a process of causing an analysis computer 4 to emit light from a light source while making a subject 5 wearing measuring spectacles gaze at a predetermined gaze point using the measuring spectacles 2 having spectacles reference points at right and left bilateral symmetry points, a stereo photographing machine 31 installed at a predetermined position, the light source 32, and the analysis computer 4 to photograph the spectacles reference point and a corneal reflex point by the stereo photographing machine; a process of analyzing the spectacles reference point and the corneal reflex point from the photographed video; a process of calculating the pupil center position of the subject from the analyzed corneal reflex point; and a process of calculating a straight line passing through the calculated pupil center and the gaze point at which the subject is made to gaze, as a gaze line.

Description

  The present invention relates to an eye gaze measurement method, an eye gaze measurement device, an eyeball rotation point measurement method, and an eye point measurement for measuring a gaze line at a distance gaze and a gaze line at a near gaze when measuring an eye point of glasses, etc. Relates to the device.

  2. Description of the Related Art Conventionally, as a method for measuring an eye point of spectacles or the like, that is, a point of intersection between a gaze line of a spectacle wearer and a spectacle lens, for example, the method of Prior Art Document 1 is known. This method measures the gaze at the distance gaze (hereinafter referred to as the distance gaze) and the gaze at the distance gaze (hereinafter referred to as the near gaze), and determines the position where both gazes intersect the spectacle lens. The eye point is measured by calculation.

  The distance gaze measurement in the prior art as described above is to perform stereo shooting by having a subject gaze at a distant gaze point and disposing a camera at a position that does not block the subject's gaze. The black eye and white eye contours are extracted from the stereo image, and the center of the extracted black eye is used as the pupil center, and a horizontal straight line extending in parallel from the left and right pupil centers is used as the distant gaze line.

  In the measurement of the near gaze, the subject is gazes at the near, and stereo shooting is performed in the same manner as in the distance gaze, and the pupil center is measured from the center of the black eye. Next, after obtaining the eyeball rotation point from the distant gaze, a straight line passing through the pupil center and the eyeball rotation point is used as the near gaze.

JP 2003-45562 A

  In general, most of the eyeball is covered with eyelids or the like, and it cannot be photographed so that all the boundaries between black eyes and white eyes can be distinguished. Therefore, it is a very difficult task to extract the black eye part from the boundary line of the black eye and the white eye and to determine the pupil center. Furthermore, since the eyeball is a sphere and a cornea having a smaller radius exists in front of the pupil, there is a problem that it is difficult to measure the center of the pupil with high accuracy.

FIG. 1 is a diagram showing the cross-sectional view and gaze line of the left and right eyes and the relationship between the eyeball rotation point and the pupil center during conventional near gaze measurement.
C _L and C _R are virtual cycloduction point of the right and left eyes, but the line c represents the distance between the eyeball rotation point, which is equal to the pupillary distance between the centers of the distant-object gaze. A _L and A _R are the vertexes of the eyeball when the left and right eyes are closely gazing, and the line segment a is equal to the distance between the pupil centers at the time of near gazing. The extension e _{L of the} line connecting the two points C _L and A _L and the extension e _R of the line connecting the two points C _R and A _R are near gaze lines, and both intersect at the point T. At this time, the eye vertex A _L of the right and left _eyes, the distance from the center O of A _R to T is viewed distance.

64mm distance between pupil centers when viewing from a distance
Thus, when the distance between the pupil centers at the near gaze is 61.6 mm, the gaze distance is 333 mm. However, the measurement of the pupil center position at the near gaze has an error of 0.1 mm with one eye, and the pupil If the distance between the centers is 61.8 mm, the gaze distance changes to 365 mm. The measurement error of the pupil center position of 0.2 mm for both eyes is about 3 cm at the gaze distance. As described above, a slight error greatly affects the measurement of the gaze line, and a method for measuring the gaze line with higher accuracy has been demanded.

In the prior art, as described above, the center point in the rotational movement of the eyeball called the eyeball rotation point is used for the measurement of the near gaze line.
This eyeball rotation point is supposed to be located about 13 mm deep from the top of the eyeball in adults. However, since the actual eyeball rotation point varies depending on the person, the above eyeball rotation point is uniformly set to 13 mm. Is just a virtual eyeball rotation point.
As shown in FIG. 1, the eye vertex A _L, A _R and cycloduction point C _L, while the measurement error of the pupil center position The longer the distance C _R can be reduced the influence on the gaze distance, of the As described above, the eyeball rotation point is a short distance of 13 mm from the apex of the eyeball, and since the eyeball rotation point itself is a virtual center point, there is a problem that it is difficult to accurately measure the gaze line.

  Further, the conventional measuring method is to obtain the pupil center from the boundary between the black eye and the white eye, but the eyeball is a sphere, and a cornea having a smaller radius exists in front of the pupil. Therefore, in order to accurately measure the pupil center, it is desirable to dispose the photographing device on the gaze line at both the distance gaze and the near gaze. Inevitably, it is necessary to prepare a photographing device for distant gaze and a near gaze separately, or to move the photographing device, which causes an increase in the scale and cost of the apparatus.

The present invention pays attention to the above situation, and an object of the present invention is to provide a method for performing high-precision gaze measurement with a simple device and a device used for the method.
It is another object of the present invention to provide a method for measuring the actual eyeball rotation point of an individual subject, not a virtual one, and an apparatus for measuring an eyepoint at the time of eyeglass creation using the above method.

  The first configuration of the present invention, which has been made for the purpose of solving the above-described problems, is a pair of measuring spectacles provided with spectacle reference points at symmetrical positions, a stereo photographic device installed at a predetermined position, a light source, and an analysis. A gaze measurement method for measuring a gaze line of a subject using a computer for the computer, wherein the analysis computer causes a subject wearing measurement glasses to gaze a predetermined gaze point to emit the light source, Taking a point and a corneal reflection point with a stereo camera, an imaging step, and analyzing the position of the eyeglass reference point and the corneal reflection point from the taken image, a position information acquisition step, and the analyzed corneal reflection point, A pupil center acquisition step for calculating the pupil center position of the subject, and a gaze line acquisition step for calculating a straight line passing through the calculated pupil center and a gaze point that the subject gazes at as a gaze line. And it is characterized in Rukoto.

  In the first configuration of the present invention, when measuring the gaze line at the time of distant gaze, the imaging step causes the subject to gaze at the distance and photographs the eyeglass reference point and the corneal reflection point, and the gaze line acquisition step includes It is preferable to calculate a horizontal straight line extending in the front-rear direction from the calculated pupil center as a gaze line at the time of distant gaze. At this time, in the pupil center obtaining step, the corneal reflection point is P ′, the corneal center is C, the straight line connecting the light source and the corneal center C is s ′, and the straight line s ′ is the corneal surface. , Where Q is the intersection point and β is the angle between the straight line s ′ and the distant gaze line, the distance P′P from the pupil center to the corneal reflection point P ′ is expressed by the following equation P′P = (QC−QP ′) It is desirable to calculate the position of the pupil center by calculating by sin β and correcting the corneal reflection point P ′ by the P′P.

  Further, when measuring a gaze line during near gaze, the light source is marked with a near gaze index in a direction opposite to the light emitting surface of the light source, and the imaging step gazes the subject at the light emitting surface of the light source. In addition to the eyeglass reference point and the corneal reflection point, the near point of interest index is photographed. Analyzing, the pupil center acquiring step regards the position of the corneal reflection point as the pupil center position, and the gaze point acquiring step calculates a straight line passing through the pupil center and the near gaze point as a gaze line at the time of near gaze. Is preferred. At this time, it is desirable that a detachable dimming filter is provided on the light emitting surface of the light source, and a near gaze point to be observed by the subject is marked on the surface of the dimming filter.

  The second configuration of the present invention, which has been made for the purpose of solving the above-described problems, is a pair of measuring glasses provided with eyeglass reference points at symmetrical positions, a stereo camera installed at a predetermined position, and a rear side. A gaze gaze measuring apparatus that measures a gaze line of a subject using a light source on which a gaze point index is marked and an analysis computer, wherein the analysis computer gazes a subject wearing measurement glasses. And shooting the spectacle reference point and the corneal reflection point with a stereo camera, and analyzing the positions of the spectacle reference point and the corneal reflection point from the captured image, Calculating the pupil center position of the subject from the analyzed cornea reflection point, and calculating a horizontal straight line extending in the front-rear direction from the calculated pupil center as a gaze line at the time of distant gaze Measuring the distance gaze by performing the gaze line acquisition step, causing the subject wearing the measurement glasses to gaze at the light emitting surface of the light source, causing the light source to emit light, and the spectacle reference point and the corneal reflection point Shooting the near gaze index with a stereo camera, and analyzing the position of the near gaze point from the imaging process and the captured image from the spectacle reference point and the corneal reflection point, and the near gaze index. A position information acquisition step, a pupil center acquisition step using the analyzed corneal reflection point as a pupil center, and a straight line passing through the analyzed pupil center and a near gaze point is calculated as a gaze line at the time of near gaze. A near gaze is measured by performing a gaze acquisition process.

In the second configuration of the present invention, the position information acquisition step in the measurement of the near gaze line is configured so that the magnification of both images is the same from the position of the eyeglass reference point in the image during the distance gaze and the image during the near gaze. It is desirable to include an image magnification correction step.
Further, according to the second configuration of the present invention, the pupil center acquisition step in the measurement of the distant gaze line is such that the corneal reflection point is P ′, the corneal center is C, the light source and the corneal center C are the planar view and the side view. Is the distance P ′ from the center of the pupil to the corneal reflection point P ′, where s ′ is the straight line connecting the straight lines s ′, Q is the intersection of the straight line s ′ and the corneal surface, and β is the angle formed by the straight line s ′ and the distant gaze line. It is preferable to calculate P by the following formula P′P = (QC−QP ′) · sin β and calculate the position of the pupil center by correcting the corneal reflection point P ′ by the P′P.
Further, according to the second configuration of the present invention, the light emitting surface of the light source is provided with a detachable dimming filter, and a near gaze point to be observed by the subject is marked on the surface of the dimming filter. May be.

  The third configuration of the present invention, which has been made for the purpose of solving the above-mentioned problems, is a pair of measuring spectacles provided with spectacles reference points at symmetrical positions, a stereo camera installed at a predetermined position, and a rear side. A method of measuring an eyeball rotation point that measures the eyeball rotation point of a subject using a light source with a direction marker and an analysis computer, the analysis computer distant from the subject wearing measurement glasses Gaze and illuminate the light source, and shoot the eyeglass reference point and the corneal reflection point with a stereo camera. The imaging process and the position of the eyeglass reference point and the corneal reflection point are analyzed from the taken image. And a pupil center obtaining step of calculating a pupil center position of the subject from the analyzed corneal reflection point, and a gaze line at the time of distant gaze on a horizontal straight line extending in the front-rear direction from the calculated pupil center The distance gaze is measured by executing the gaze line acquisition step, and the subject wearing the measurement spectacles gazes at the light emitting surface of the light source to emit the light source, and the eyeglass reference point and the cornea The reflection point and the near-gaze index are photographed by a stereo camera, and the position of the near-gaze point is determined from the imaging process and the captured image from the eyeglass reference point, the corneal reflection point, and the near-gaze index. Analyzing position information acquisition step, pupil center acquisition step using the analyzed corneal reflection point as the pupil center, and calculating the straight line passing through the analyzed pupil center and near gaze point as a gaze line at the time of near gaze Performing a gaze line acquisition step, measuring a near gaze line, and calculating an intersection of the measured far gaze line and the near gaze line as an eyeball rotation point.

In the third configuration of the present invention, the position information acquisition step in the measurement of the near gaze is configured so that the magnification of both images is the same from the position of the eyeglass reference point in the image at the distance gaze and the image at the near gaze. It is desirable to include an image magnification correction step.
In the third configuration of the present invention, the pupil center acquisition step in the measurement of the distant gaze is such that the corneal reflection point is P ′, the corneal center is C, the light source and the corneal center C are each in plan view and side view. Is the distance P ′ from the center of the pupil to the corneal reflection point P ′, where s ′ is the straight line connecting the straight lines s ′, Q is the intersection of the straight line s ′ and the corneal surface, and β is the angle formed by the straight line s ′ and the distant gaze line. It is preferable to calculate P by the following formula P′P = (QC−QP ′) · sin β and calculate the position of the pupil center by correcting the corneal reflection point P ′ by the P′P.
Further, according to a third configuration of the present invention, a light-reducing filter that can be attached to and detached from the light-emitting surface of the light source is provided, and a near gaze point that causes a subject to gaze is marked on the surface of the light-reducing filter. May be.

  The fourth configuration of the present invention, which has been made for the purpose of solving the above-mentioned problem, is a pair of spectacles provided with spectacles reference points at left and right symmetrical positions, a stereo photographic machine, and a near gaze index marked on the back side. An eye point measuring apparatus for measuring an eye point composed of an intersection of a gaze line of a subject and a lens of a spectacle using a light source and an analysis computer, wherein the analysis computer applies to the subject wearing the spectacle. Gaze at a distant place, cause the light source to emit light, and take a spectacle reference point and a corneal reflection point with a stereo camera. An information acquisition step, a pupil center acquisition step of calculating the pupil center position of the subject from the analyzed corneal reflection point, and a horizontal straight line extending in the front-rear direction from the calculated pupil center. Calculating a gaze line at the time of gaze, performing a gaze line acquisition step, measuring a distant gaze line, causing a subject wearing the glasses to gaze at the light emitting surface of the light source, and causing the light source to emit light. A point, a corneal reflection point, and the near point of interest index are photographed by a stereo camera, and from the photographing process and the photographed image, the eyeglass reference point, the corneal reflection point, and the near point of interest index The position information acquisition step of analyzing the position of the pupil, the pupil center acquisition step using the analyzed corneal reflection point as the pupil center, and the straight line passing through the analyzed pupil center and the near gaze point during the near gaze. Calculating a gaze, measuring a near gaze by executing a gaze acquisition step, calculating a position of the spectacle lens from the analyzed spectacle reference point, and calculating the spectacle lens and the measured distance The intersection of the line of sight and proximal fixation line, is characterized in that calculated as the distance eye point and the near eye point, respectively.

According to a fourth configuration of the present invention, in the position information acquisition step in the measurement of the near gaze, the magnification of both images is made the same from the position of the eyeglass reference point in the image at the distance gaze and the image at the near gaze. It is desirable to include an image magnification correction step.
According to a fourth configuration of the present invention, the pupil center acquisition step in the measurement of the distant gaze line includes P ′ for the corneal reflection point, C for the corneal center, C for the light source and corneal center C for each of the planar view and the side view. Is the distance P ′ from the center of the pupil to the corneal reflection point P ′, where s ′ is the straight line connecting the straight lines s ′, Q is the intersection of the straight line s ′ and the corneal surface, and β is the angle formed by the straight line s ′ and the distant gaze line. It is preferable to calculate P by the following formula P′P = (QC−QP ′) · sin β and calculate the position of the pupil center by correcting the corneal reflection point P ′ by the P′P.
Further, according to a fourth configuration of the present invention, a light-reducing filter that can be attached to and detached from the light-emitting surface of the light source is provided, and a near gaze point that causes a subject to gaze is marked on the surface of the light-reducing filter. May be.
In the fourth configuration of the present invention, the analyzing computer further executes a near gaze reacquisition step, and the near gaze reacquisition step includes the measurement of the measured far gaze and the near gaze. It is preferable that the eyeball rotation point of the subject is calculated from the intersection point, and the near gaze point newly set by the operator and the straight line passing through the calculated eyeball rotation point can be calculated as a new near gaze line.

  According to the first and second configurations of the present invention, it is possible to perform highly accurate gaze measurement by obtaining the pupil center of the subject from the corneal reflection point instead of the contour of the black eye. Thereby, since it is not necessary to provide a photographing device on the gaze line when photographing the subject, it is possible to measure both a distant gaze and a near gaze using a single stereo photographing device, A simple configuration can be obtained.

  According to the third configuration of the present invention, the actual eyeball rotation point of the subject can be measured by calculating the position of the eyeball rotation point based on the distant gaze line and the near gaze line obtained from the actual measurement values.

  According to the fourth configuration of the present invention, since a highly accurate gaze line can be measured by a simple device having one stereo photographic machine, the eye point that is the intersection of the gaze line and the spectacle lens can be increased with a simple configuration. It can be measured with accuracy.

The conceptual diagram which shows the conventional near eye gaze measurement method. The conceptual diagram at the time of measuring the distant gaze line in 1st Example by this invention. The figure which shows the spectacles for measurement in the Example. It is a figure which shows the light source in the Example, (a) is a front view of the state which removed the filter, (b) is a front view of the state which mounted | wore the filter, (c) is a rear view, (d) is a side view. It is. The conceptual diagram of the flow of a gaze measurement in the Example. The front view which shows the positional relationship of the cornea reflection point at the time of the distant gaze in the Example, and a spectacles reference point. It is a figure which shows the positional relationship of the cornea reflection point at the time of a distant gaze in the Example, and a pupil center, (a) is a side view, (b) is a top view. The conceptual diagram at the time of measuring the near gaze in the Example. The front view which shows the positional relationship of the cornea reflection point at the time of near gaze in the Example, and a spectacles reference point. It is a figure which shows the positional relationship of the cornea reflection point at the time of near gaze in the Example, and a pupil center, (a) is a side view, (b) is a top view. It is a figure which shows the positional relationship of the pupil center at the time of near gaze in the Example, and a gaze point, (a) is a top view, (b) is a side view. The conceptual diagram of the flow of the eyeball rotation point measurement in 2nd Example by this invention. It is a figure which shows the relationship of a distant gaze line in a 2nd Example, a near gaze line, and an eyeball rotation point, (a) is a top view, (b) is a side view. The figure which shows the newly created spectacles in the 3rd Example by this invention. The conceptual diagram of the flow of the eyepoint measurement in a 3rd Example. It is a figure which shows the relationship of the test subject's eyeball in a 3rd Example, a distant gaze, and a spectacles reference plane, (a) is a side view, (b) is a top view. The front view which shows the relationship between the distance eye point and the near eye point in a 3rd Example. (A) is the figure which projected the three-dimensional data at the time of near gaze as gaze distance f on the yz plane, (b) is the figure which projected the figure of (a) on the xy plane. The distant gaze lines dL and dR are drawn on the xz plane projected from the state of gazing at the gazing point T ′ in FIG. 18B to obtain the eye rotation points C ′ _L and C ′ _R. Figure.

Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a diagram illustrating a configuration of the gaze measuring apparatus 1 according to the first embodiment of the present invention. As shown in FIG. 2, the gaze measuring device 1 includes measuring glasses 2, a stereo imaging device 3, and an analysis computer 4.

Measuring glasses 2, as shown in Figure 3, the spectacle frame 21, left and right dummy lens 22 is constructed spectacle reference point O _R, from O _L.

The spectacle frame 21 and the dummy lens 22 may be general spectacles that do not have a degree. The dummy lens 22 is a member necessary to provide spectacle reference point O _R, the O _L in the lens frame of the spectacle frame 21, the lens frame in the entire region is not required to be closed by the dummy lens 22 .

Glasses reference point O _R, O _L is a mark provided on each of the aforementioned dummy lens 22, by analyzing spectacle reference point O _R, the position of the O _L by the position information obtaining step described below, far gaze This is for detecting and correcting when the face or the like of the subject 5 is tilted at the time of close gaze.

  The stereo photographing device 3 photographs the subject 5 at the time of distant gaze and near gaze, and includes a stereo photographing device 31, a light source 32, and a photographing device frame 33 as shown in FIG. .

The stereo photographic machine 31 has two lenses arranged in parallel in the left-right direction of the subject 5 and is for specifying the three-dimensional position of the subject.
The stereo camera 31 in this embodiment is controlled by an analysis computer 4 to be described later, and is a camera that can transfer a captured image to the analysis computer 5 after shooting. If so, a stereo camera having a general configuration can be used. In addition, it may be configured such that after two identical photographing devices are arranged in parallel, the analysis computer 5 controls the two photographing devices so as to synchronize.

The light source 32 is a strobe that emits light in conjunction with the stereo camera 31. This is for photographing a state in which the light source 32 emits light during photographing and the emitted light is reflected on the eye of the subject 5.
Further, as shown in FIGS. 4A and 4B, the light source 32 is detachable from a filter 32b that also serves as a near-gaze point T on the strobe light emitting surface 32a. Further, as shown in FIGS. 4C and 4D, the near gaze point for analyzing the position of the near gaze point T1 is provided on the back side of the light source 32, that is, the side opposite to the strobe light emitting surface 32a. The indicator 32c is marked.

  The photographing device frame 33 is a frame for installing the stereo photographing device 31 and the light source 32. The stereo camera 31 is fixed to the frame 33, and the light source 32 is detachably installed on the frame 33.

  The analysis computer 4 is connected to the stereo photographing device 3 and controls the stereo photographing device 3 and calculates a gaze line from an image photographed by the stereo photographing device 3, and is a general computer, , A computer having a configuration in which a CPU, a memory, a storage device, an input / output device, and the like are connected by a bus. A position information acquisition process, a pupil center calculation process, and a gaze line calculation process, which will be described later, are executed by the analysis computer 4.

The above is the configuration of the gaze measurement apparatus 1 of the present embodiment. A method of gaze measurement using the gaze measurement apparatus 1 will be described below.
FIG. 5 is a diagram illustrating a flow of gaze measurement using the gaze measurement device 1 of the present embodiment. The gaze measuring device 1 is a device capable of measuring both a distant gaze and a near gaze, and measures any gaze according to the flow.

  When measuring the distant gaze, as shown in FIG. 2, with the stereo imaging device 3 placed on the desk 61, the subject 5 wears the measuring glasses 2 and sits on the chair 62 to distantly observe. Gaze at the viewpoint T2. The far gaze point T2 may be anything as long as it is a mark for the subject 5, or may be omitted if the subject 5 can gaze far away without using it.

  The photographing step S01 shown in FIG. 5 is performed in the above state. When the operator operates the analyzing computer 4, the light source 32 included in the stereo imaging device 3 is caused to emit light, the light of the light source 32 is reflected to the eyes of the subject 5, and both eyes in a state where the light is reflected are stereo-photographed. The image is taken by the machine 31 and the taken image is transferred to the analysis computer 4.

When the image is transferred to the analysis computer 4 in the photographing step S01, the computer 4 executes a position information acquisition step S02. Position information obtaining step S02, the spectacle reference point O _R from the captured image in the image taking step _S01, extracts the O _L and corneal reflection point P ', to synthesize the corresponding points of the right and left images, the object, i.e. the subject 5 It reproduces 3D information at a specific position. Glasses reference point O _R, analysis of O _L and corneal reflection point P 'is desirably can automatically analyzed software by analyzing computer 4 may also be analyzed without using the analyzing computer 4.

FIG. 6 is a schematic diagram showing a projection of image data reproduced three-dimensionally in a front view (xy plane). In the present embodiment, as shown in FIG. 2, the light source 32 is incorporated in a part of the stereo imaging device 3, illuminates the subject 5 with an elevation angle, and the cornea has a spherical shape. The reflection point P ′ is reflected in the lower part of the pupil.
The installation position of the light source 32 is not limited to the above. If the position of the light source 32 is provided above the subject 5, the corneal reflection point P ′ appears above the center of the pupil, and if it faces the subject 5, the corneal reflection point P ′ and the height of the pupil center coincide. If the light source 32 is provided separately from the stereo photographing device 3, a large facility is required. However, in this embodiment, the light source 32 can be incorporated as a part of the stereo photographing device 3 to make a simple configuration.

  In this embodiment, since the light source 32 illuminates the subject 5 with an elevation angle as described above, the corneal reflection point P ′ is reflected in the lower part of the pupil, and the pupil center is obtained from this corneal reflection point. The vertical direction (y direction) and the horizontal direction (x direction) are corrected according to the installation position of the light source 32.

Position information obtaining step S02 by the spectacle reference point O _R, O _L and corneal reflection point P 'the three-dimensional position of the analysis, the pupil center acquisition step S03 is performed by the analyzing computer, corneal reflection point P' Is corrected in the y direction and the x direction, and the position information of the pupil center is acquired.

  FIG. 7A is a schematic diagram in which the positional relationship between the corneal reflection point P ′ of the subject 5 and the pupil center P is projected in a side view (yz plane). The image point P ′ is a corneal reflection point, but since the shape of the front surface of the cornea is a spherical surface, the corneal reflection point is not the surface of the cornea but forms a virtual image at an image point P ′ inside thereof. Therefore, the y and z components of the coordinates obtained as the three-dimensional data of the corneal reflection point are not on the corneal surface, but are the y and z components of the image point P ′.

Let s denote a light ray incident on the apex of the eye from the light source 32, and let s ′ denote a light ray directed from the light source 32 toward the center of the cornea. S 'is not strictly parallel to s, but the distance (depth) from the stereo camera 31 including the light source 32 to the subject's eyes is set to about 70 to 80 cm and can be considered to be almost parallel. . The image point P ′ coincides with the intersection of a straight line including the light ray s ′ from the light source 32 and a straight line including the reflected light ray g from the cornea toward the stereo photographic device 31. 'When the angle of the far sight line d and beta _y, y coordinates of the pupil center P is the image point P' light s a plus correction value P'P the y component of the.

The correction value P′P can be calculated by (QC−QP ′) · sin β _y . Here, QP ′ is the distance from the corneal surface to the image point P ′ and can be obtained from the law of reflection. The calculation of the distance QP ′ requires the cornea radius QC, but the average value of the cornea radius of the human body is 7.8 mm, and the distribution range is 6.8 to 8.5 mm. Since the error range is about ± 0.1 mm, it can be considered that there is almost no influence on the correction value even if the distribution range is ignored.

  FIG. 7B is a schematic diagram in which the positional relationship between the corneal reflection point of the right eye of the subject 5 and the pupil center is projected in plan view (xz plane). As in FIG. 7A, the image point P ′ is a corneal reflection point, and the corneal reflection point forms a virtual image not on the corneal surface but on the inner image point P ′.

  The light source 32 and the stereo camera 31 are arranged on the same longitudinal axis (z axis) with a space therebetween, but the distance to the eye of the subject 5, that is, the depth is set to about 70 to 80 cm. The incident light from the light source 32 and the reflected light from the cornea toward the stereo camera 31 can be considered as the same straight line. That is, the incident rays s and s 'and the reflected ray g in FIG. 7A can be substituted by the straight line g, and the image point P' exists on the straight line g.

If the angle between the light ray g and the distant gaze line d is β _x , the x coordinate of the pupil center P is obtained by adding the correction value P′P to the x component of the image point P ′. This correction value P′P can be obtained by (QC-QP ′) · sin β _x , similarly to the correction value on the yz plane.

  In the pupil center acquisition step S03, the correction value in the y direction and the correction value in the x direction are obtained, and the pupil center position is obtained by adding the correction value to the y component and the x component of the corneal reflection point. By this step S03, the position of the light source 32 can be freely set regardless of the position of the distant gaze point. As a result, the light source 32 can be incorporated into the stereo photographing device 3, and it is not necessary to provide a device with a separate light source at the time of distant gaze and near gaze. With this configuration, the gaze measuring device 1 can be simplified.

When the position of the pupil center P is obtained by the pupil center obtaining step S03, the gaze line obtaining step S04 is executed by the analyzing computer 4.
When measuring a distant gaze, a straight line parallel to the front-rear direction (z-axis direction) is obtained from each of the left and right pupil centers P, and this straight line is used as a distant gaze.

  After the distance gaze measurement is completed, the near gaze measurement can be subsequently performed. In this embodiment, the order of gaze measurement is first the far gaze, and then the near gaze, but the order is not limited to this, and the near gaze may be measured first.

  When measuring the near gaze line, as shown in FIG. 8, the light source 32 is separated from the stereo imaging device 31, and the subject 5 is held by the subject 5 to gaze at the near gaze point. The photographing step S01 is executed in the above state, and it is necessary to include the near-gaze point index 32c on the back surface of the light source 32 in the image photographed at this time.

  When the imaging step S01 is completed, the position information acquisition step S02 is executed by the analysis computer 4 in the same manner as when measuring the distant gaze.

FIG. 9 is a schematic diagram showing a projection of the image data reproduced three-dimensionally in the position information acquisition step S02 in a front view (xy plane). Since the near gaze index 32c marked on the back of the light source 32 is included in the image in the near gaze image, it is necessary to analyze the near gaze index 32c.
Further, the light source 32 in this embodiment is provided with a dimming filter 32b having a near-focus point T drawn on the strobe light emitting surface 32a. As shown in FIGS. Since the viewpoint index 32c is provided on the back surface of the light source 32, strictly speaking, there is a difference between the position of the near gaze point index 32c and the position of the near gaze point T. In the position information acquisition step S02, the position of the near gaze point T is obtained from the position of the near gaze point index 32c by correcting the difference.

In addition, as described above, the gaze measuring apparatus 1 of the present embodiment can measure both the far gaze and the near gaze, but the subject 5 gazes at the light source 32 during the near gaze, so that the face is It is assumed that the distance between the subject 5 and the stereo photographic device 3 changes when the camera is tilted naturally and when the remote gaze is close and the close gaze. During proximal fixation, the spectacle reference point O _R in the captured image at the time of and proximal gaze far _gaze, from the position of the O _L detecting the change, it can be corrected to offset the magnification difference such as . Glasses reference point O _R, interval O _L may be arbitrary, but who are away comparing the size of the image, accuracy in correction will be improved. In the present embodiment this respect, spectacle reference point O _R, O _L is respectively provided outside the left and right dummy lens 22.

Further, Glasses reference point O _R, since exact distance O _L are known in advance, spectacle reference point O _R together with the corneal reflection point such _as, O _L also be reproduced as three-dimensional data, the spectacle reference point O _R, the distance O _L can be used to provide a precise exact location of each point of the cornea reflection point P 'or the like which is reproduced in three dimensions. Thereby, the pupil center position at the time of distant gaze, the pupil center position at the time of near gaze, and the near gaze point position can be reproduced three-dimensionally with an actual magnification within the same coordinate system. Thereby, the said gaze point measuring apparatus 1 and the gaze point measurement method are applicable to the below-mentioned eyeball rotation point measurement and eye point measurement.

Corneal reflection point by the position information obtaining step S02, spectacle reference point O _R, O _L, when analyzing the position of the near fixation point T1, the pupil center position acquisition step S03 is performed by the analyzing computer 4.

  FIGS. 10A and 10B are schematic diagrams showing the positional relationship between the corneal reflection point and the pupil center at the close gaze. In the near gaze, unlike the far gaze, the near gaze line and the light beam from the light source 32 toward the eye coincide. Therefore, since the image point P is obtained on the gaze line, the image point P obtained as three-dimensional data is not only a corneal reflection point but also a pupil center. Since the position in the real space coincides with the position of the three-dimensional data obtained by image analysis at the close gaze, the pupil center obtaining step S03 directly uses the position of the corneal reflection point obtained in the position information obtaining step S02 as the pupil. The center is P.

When the pupil center position step S03 is completed, the gaze line acquisition step S04 is executed by the analysis computer 4.
At the time of near gaze measurement, the near gaze point T1 has been acquired by the position information acquisition step S02, and the pupil center P has already been acquired as three-dimensional data by the pupil center position acquisition step S03. Accordingly, as shown in Figure 11 (a) (b), the pupil center P _L of the left and right _eyes, a straight line extending in the proximal fixation point T from the respective P _R a proximal fixation line. The gaze acquisition configuration S04 is a step of obtaining the straight line.

The above is the description of the first embodiment of the present invention. In this embodiment, the near gaze line can be analyzed by the pupil center P and the near gaze point T obtained as a result of the image analysis. At this time, since a virtual eyeball rotation point of 13 mm from the apex of the eyeball is not used, the near gaze point can be measured with high accuracy.
In addition, in the above-described conventional technology, the subject takes a picture with the photographing device in a state where the subject has an apparatus in which the photographing device and the near gaze point are integrated at the time of the near gaze. Therefore, it is necessary to provide a new three-dimensional measuring device outside in order to specify the position of the near gaze point. Inevitably, in this configuration, the entire apparatus is large, but in the configuration of the present embodiment, by acquiring the position of the near gaze point T from the near gaze point index 32 c provided in the light source 32. In addition, an external three-dimensional measuring device or the like is not necessary, and the gazing point measuring device 1 can have a simple configuration.

  Further, both the distant gaze and the near gaze can be measured by the gaze measuring device 1. Since it is not necessary to provide a separate photographing device or the like for the distant gaze and the near gaze, highly accurate gaze measurement can be realized with a simple device.

  In the first embodiment, the distant gaze and the near gaze can be obtained as three-dimensional data on the same coordinates by the gaze measuring device 1 and the gaze measuring method. In the second embodiment of the present invention, the actual eyeball rotation points of five subjects are measured, not virtual, using the distant gaze and the near gaze measured by the gaze measurement method.

FIG. 12 is a conceptual diagram showing a flow of an eyeball rotation point measuring method according to the second embodiment. The configuration of the first gaze measuring device 1 is used as it is in the eyeball rotation point measuring method according to the second embodiment.
The distant gaze measurement step S05 and the near gaze measurement step S06 are specifically the gaze measurement method described in the first embodiment, that is, steps S01 to S04. When the measurement of both the far gaze and the near gaze is completed, the eye rotation point acquisition step S07 is executed by the analysis computer 4.

FIGS. 13A and 13B are schematic diagrams in which a distant gaze and a near gaze are plotted on the same coordinates. Straight lines d _L and d _R are distant gaze lines for the left and right eyes, and straight lines e _L and e _R are near gaze lines for the left and right eyes. Intersection of the straight line d _L and e _L, and, by finding an intersection of the straight line d _R and e _R, actually cycloduction point C _L of the right and left eyes when gazing at the near vision fixation point _T, the C _R Can be obtained.

  In the second embodiment, since the eyeball rotation point is measured using the near gaze line obtained from the actual near gaze point, the actual eyeball rotation point of the subject 5 can be measured with a simple device.

  On the other hand, when the distant and near gaze lines are specified, it is possible to set the optimal position of the eye point, that is, the intersection of the gaze line and the spectacle lens when creating a spectacle lens such as a progressive lens. The third embodiment of the present invention is an eye point measurement apparatus and an eye point measurement method using the gaze measurement method in the first embodiment.

  The eyepoint measuring apparatus of the third embodiment is a pair of eyeglasses 2 ′ (hereinafter referred to as newly created eyeglasses 2) obtained by combining the measuring glasses 2 of the first embodiment with a dummy lens 22 in a frame 21 ′ of eyeglasses actually produced. ').

New glasses as shown in Figure 14, in which the marked glasses reference point New glasses _{2 'U R, U L,} L R, L L, O R, O L, I R, the _{I L.} The difference from the first embodiment is that a spectacle frame 21 ′ that is actually created is used and that four spectacle reference points are provided for each dummy lens 22.

  FIG. 15 is a conceptual diagram showing a flow of an eye point measurement method. In the second embodiment, an eyeball rotation point acquisition step S07 is provided after the distance gaze measurement step S05 and the near eye gaze measurement step S06. However, in the third embodiment, the eye rotation point acquisition step S07 is used instead of the eyeball rotation point acquisition step S07. A point acquisition step S08 is provided.

  In the third embodiment, in the position information acquisition step S02 included in the distant gaze measurement step S05 and the near gaze measurement step S06, in addition to the spectacle reference point, a plane based on the spectacle reference point ( Analyze eyeglass reference plane).

In FIG. 14, four eyeglass reference points are marked on the left and right dummy lenses, respectively. _{O R, I R, I L} , O L horizontal straight line, equidistant from the _center, U R, _{L R} and _U L, _{L L} is marked to be orthogonal to the reference point on the horizontal line.
FIGS. 16A and 16B are schematic diagrams showing the positional relationship between the distant gaze of the right eye of the subject and the spectacle reference plane. From Glasses reference point _{U R} and _{L R,} it is possible to obtain the inclination angle α in the vertical direction of the dummy lens as shown in FIG. 16 (a), the spectacle reference point _{I R} and _{O R,} in FIG. 16 (b) As shown, the tilt angle β in the left-right direction of the dummy lens can be obtained. Glasses reference surface comprises a spectacle reference point I _R, the tilt angle in the vertical direction alpha, obtained as three-dimensional plane having an inclination angle β in the lateral direction.

When the far gaze measurement step S05 and the near gaze measurement step S06 including the above steps are completed, the eye point measurement step S07 is executed by the analysis computer 4.
Since the spectacle reference plane is analyzed in the position information acquisition step S02, the distance eyepoint is calculated as the intersection of the spectacle reference plane and the distant gaze, and the near eyepoint is calculated as the intersection of the spectacle reference plane and the near gaze. Is required.

FIG. 17A is a schematic diagram in which a distance eye point and a near eye point are plotted in front view, FE _R and FE _L are distance eye points, and NE _R and NE _L are near eye points. It is.
FIG. 17 (b) is a partially enlarged view of FIG. 17 (a), and _ay corresponds to the amount of downward line of the eye from the distance gaze to the near gaze, and determines the progressive zone length of the progressive lens. Parameter. Similarly, a _x is equivalent to the amount of eye convergence (amount of crossing) from the time of distant gaze to the time of near gaze, and is a parameter that determines the inward amount of the progressive lens.

In the eye point measurement step S07, the eye point and the progressive zone length and the inward amount of the progressive lens are measured.
By measuring the above values using the near gaze analyzed using the gaze point obtained from the near gaze index without using the virtual eyeball rotation point, the optimal position of the eye point can be easily configured. Can be measured.

  Furthermore, by combining the configuration of the second embodiment, the actual eyeball rotation point of the subject can be obtained also in this embodiment. For example, when fine adjustment of the gaze position T such as the gaze distance is necessary, the near gaze line is recalculated from the new gaze position and the eyeball rotation point without re-imaging the subject at the near gaze, The eye point can be changed.

In addition, the structure of this invention is not restricted to the said Example.
For example, in the first embodiment, the stereo photographic device 31 is installed at a position where the subject 5 is photographed from the lower side with an elevation angle. However, the position where the stereo photographic device 31 is installed is not limited to this. The accompanying position may be used.
Further, the stereo photographing device 3 and the analysis computer 4 may be controlled by the analysis computer 4 as long as the stereo photographing device 3 can be controlled, may be controlled by wire, or may be controlled by radio.

In the above-described first to fourth configurations and embodiments of the present invention, the three-dimensional information of the near gaze point is obtained by photographing the index marked on the light source with a stereo photographing machine and processing the image with an analysis computer. It was obtained by.
In the present invention, for example, the distance from the subject's eye to the near gaze point (hereinafter referred to as the gaze distance) is measured in advance without photographing the index marked for the near gaze point data. By processing the measurement data together with other data, it is possible to specify the eyeball rotation point and the near gaze line during the near gaze. Therefore, this method does not require marking of an index.
For example, FIG. 18A is a diagram obtained by projecting three-dimensional data on the yz plane when the gaze distance is f and the near gaze is being performed. P _{L, P R} is the pupil center, T is a proximal fixation point distance f. FIG. 18 (a) also shows a symbol with a dash where the eye is rotated in the direction of the arrow so that the near gaze point T is parallel to the z-axis.
Here, when FIG. 18A is projected onto the xz plane, the diagram of FIG. 18B is obtained. In FIG. 18 (b), the Considering that the pupil center _P L, _{P R} and P _'L, P' is positioned at the x-coordinate of _R are matched, triangle _P L TP _R and a triangle P _'L T' , P ′ _R are congruent, FIG. 18B can be expressed as shown in FIG.
Then, as shown in FIG. 19, the straight line e ′ _L passing through the two points P ′ _L and T ′ and the intersection C ′ _L between the distant gaze line d _L and the straight line e ′ passing through the two points P ′ _R and T ′. 'can be obtained _R, these C' intersection C between _R and far sight line d _R time _L, C _R, which gazing actually watch point T described in FIG. 13 (a) above of eyeball rotation point _C L, consistent with _{C R.} Thus once the eyeball rotation point, FIG. 13 (a) are shown as two points _C L, the straight line _{e L} and passing through the _{P L,} the straight line _{e R} passing through the two points _C R _{P R} as near vision sight line Can be obtained.

On the other hand, use the illumination (light source) arranged at the time of remote gaze shooting to shoot near gaze and fix the near gaze point at that time at the same position as the illumination, or between the imaging device and the subject The three-dimensional information of the near gaze point is obtained by disposing it at an arbitrary fixed position, and the three-dimensional information of the corneal reflection point obtained by the photographing of the near gaze is processed by the computer to obtain the eyeball rotation point. A close gaze can be obtained. Note that the obtained near gaze point may be different from the actual gaze distance, but this may be corrected.
For example, when the shooting to proximal fixation light source and near vision fixation point to the same, as shown in FIG. _{13 (a), P L P} R is proximal pupil center of the left and right eyes during fixation, T is It becomes a close attention point. Accordingly, 2-point T, and the straight line _{e L} passing through the _{P L,} 2 points T, straight _{e R} passing through the _{P R} is proximal fixation line.
Further, the eyeball rotation points C _L and C _R of the left and right eyes when the intersection of the straight lines d _L and e _{L and} the intersection of the straight lines d _R and e _R in FIG. It becomes.
The above proximal fixation line e _L, e _R, since the gaze distance is fixed (the position of the light source), if different from the proximal fixation line at a near-work distance to be subject to actual work, It can be modified as necessary.
On the other hand, unlike the above, when the near gaze point is photographed at a fixed position different from the light source, the same as in the case of the analysis of the far gaze image described in paragraphs 0035 to 0048 with reference to FIGS. In addition, since the corneal reflection point and the pupil center do not coincide with each other, the y direction and the x direction are corrected in order to obtain the pupil center from the corneal reflection point. This correction may be performed in the same manner as in the analysis of the distant gaze image. After the correction, it is possible to obtain a near gaze line and an eyeball rotation point by executing the same processing as when the light source and the near gaze point are at the same position.
Other specific configurations are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Eye gaze measuring device 2 Glasses for measurement 3 Stereo imaging device 31 Stereo imaging device 32 Light source 33 Imaging device frame 4 Computer for analysis 5 Subject

Claims (22)

A gaze measurement method for measuring a gaze of a subject using a measurement spectacle having a spectacle reference point at a symmetrical position, a stereo photographic machine installed at a predetermined position, a light source, and an analysis computer,
The analysis computer is
An imaging process of causing a subject wearing measurement glasses to gaze at a predetermined gazing point, causing the light source to emit light, and photographing a glasses reference point and a corneal reflection point with a stereo photographic device,
A position information acquisition step of analyzing the positions of the spectacle reference point and the corneal reflection point from the captured image;
From the analyzed corneal reflection point, the pupil center acquisition step of calculating the pupil center position of the subject,
A gaze line acquisition step of calculating a straight line passing through the calculated pupil center and a gaze point that the subject gazes at;
A gaze measurement method, characterized in that The gaze measurement method is a gaze measurement method during distant gaze,
In the imaging step, the eyeglass reference point and the corneal reflection point are imaged by gazing at the distance of the subject,
The gaze line measurement method according to claim 1, wherein the gaze line acquisition step calculates a horizontal straight line extending in the front-rear direction from the calculated pupil center as a gaze line at the time of distant gaze. The pupil center acquisition step is performed for each of a plan view and a side view.
The cornea reflection point is P ′, the cornea center is C, the straight line connecting the light source and the cornea center C is s ′, the intersection of the straight line s ′ and the cornea surface is Q, and the angle formed by the straight line s ′ and the distant gaze is β Where P′P = (QC−QP ′) · sin β is a distance P′P from the pupil center to the corneal reflection point P ′.
3. The gaze measurement method according to claim 2, wherein the position of the center of the pupil is calculated by correcting the corneal reflection point P ′ with the P′P. The gaze measurement method is a gaze measurement method at the time of near gaze,
The light source is marked with a near gaze index in a direction opposite to the light emitting surface of the light source,
The photographing step is to cause the subject to gaze at the light emitting surface of the light source, and photograph a near-gaze index in addition to the spectacle reference point and the corneal reflection point,
In the position information acquisition step, in addition to the spectacle reference point and the corneal reflection point, the near gaze point is analyzed from the near gaze index,
The pupil center acquisition step regards the position of the corneal reflection point as the pupil center position,
The gaze point measurement method according to claim 1, wherein the gaze point acquisition step calculates a straight line passing through the pupil center and the near gaze point as a gaze line at the time of near gaze. The light emitting surface of the light source is provided with a detachable dimming filter,
The gaze line measuring method according to claim 4, wherein a near gaze point that causes the subject to gaze is marked on the surface of the dimming filter.   6. The note according to claim 4, wherein the near gaze point index is not provided, and the position information of the near gaze point is acquired and used as distance data to a preset point instead of the index. Gaze measurement method. Measurement glasses with eyeglass reference points at symmetrical positions, a stereo camera installed at a predetermined position, a light source with a near gaze index marked on the back side, and an analysis computer A gaze measuring device for measuring a gaze,
The analysis computer is
A photographing process of causing a subject wearing measurement glasses to gaze at a distance and causing the light source to emit light, and photographing a spectacle reference point and a corneal reflection point with a stereo photographing device,
A position information acquisition step of analyzing the positions of the spectacle reference point and the corneal reflection point from the captured image;
From the analyzed corneal reflection point, the pupil center acquisition step of calculating the pupil center position of the subject,
A gaze line acquisition step of calculating a horizontal straight line extending in the front-rear direction from the calculated pupil center as a gaze line during distant gaze,
Measure the distant gaze by performing
An imaging process of causing a subject wearing measurement glasses to gaze the light emitting surface of the light source to emit light, and photographing the eyeglass reference point, the corneal reflection point, and the near gaze point index with a stereo photographic machine,
From the captured image, a position information acquisition step of analyzing the position of the near gaze point from the eyeglass reference point and the corneal reflection point, and the near gaze index,
Pupil center acquisition step with the analyzed corneal reflection point as the pupil center,
A gaze line acquisition step of calculating a straight line passing through the analyzed pupil center and near gaze point as a gaze line at the time of near gaze,
Gaze gaze measuring device for measuring near gaze by executing The position information acquisition step in the measurement of the near gaze line includes an image magnification correction step in which the magnification of both images is made the same from the position of the eyeglass reference point in the image at the distance gaze and the image at the near gaze. The gaze measurement apparatus according to claim 7, wherein: In the measurement of the distant gaze, the pupil center acquisition step is performed for each of the planar view and the side view.
The cornea reflection point is P ′, the cornea center is C, the straight line connecting the light source and the cornea center C is s ′, the intersection of the straight line s ′ and the cornea surface is Q, and the angle formed by the straight line s ′ and the distant gaze is β Where P′P = (QC−QP ′) · sin β is a distance P′P from the pupil center to the corneal reflection point P ′.
The gaze measurement apparatus according to claim 7 or 8, wherein the position of the center of the pupil is calculated by correcting the corneal reflection point P 'with the P'P. The light emitting surface of the light source is provided with a detachable dimming filter,
The gaze line measuring device according to any one of claims 7 to 9, wherein a near gaze point that causes a subject to gaze is marked on a surface of the dimming filter.   The near gaze point index is not provided, and the position information of the near gaze point is acquired and used as distance data to a preset point instead of the index. Gaze measurement device. Eyeglasses of a subject using a spectacle reference point at a symmetrical position, a stereo camera installed at a predetermined position, a light source with a near gaze index marked on the back side, and an analysis computer An eyeball rotation point measurement method for measuring a rotation point,
The analysis computer is
A photographing process of causing a subject wearing measurement glasses to gaze at a distance and causing the light source to emit light, and photographing a spectacle reference point and a corneal reflection point with a stereo photographing device,
A position information acquisition step of analyzing the positions of the spectacle reference point and the corneal reflection point from the captured image;
From the analyzed corneal reflection point, the pupil center acquisition step of calculating the pupil center position of the subject,
A gaze line acquisition step of calculating a horizontal straight line extending in the front-rear direction from the calculated pupil center as a gaze line during distant gaze,
Measure the distant gaze by performing
An imaging process of causing a subject wearing measurement glasses to gaze the light emitting surface of the light source to emit light, and photographing the eyeglass reference point, the corneal reflection point, and the near gaze point index with a stereo photographic machine,
From the captured image, a position information acquisition step of analyzing the position of the near gaze point from the eyeglass reference point and the corneal reflection point, and the near gaze index,
Pupil center acquisition step with the analyzed corneal reflection point as the pupil center,
A gaze line acquisition step of calculating a straight line passing through the analyzed pupil center and near gaze point as a gaze line at the time of near gaze,
Measure the near gaze by running
A method of measuring an eyeball rotation point, wherein the measured intersection point of the distant gaze line and the near gaze line is calculated as an eyeball rotation point. The position information acquisition step in the measurement of the near gaze line includes an image magnification correction step in which the magnification of both images is made the same from the position of the eyeglass reference point in the image at the distance gaze and the image at the near gaze. The method of measuring an eyeball rotation point according to claim 12. In the measurement of the distant gaze, the pupil center acquisition step is performed for each of the planar view and the side view.
The cornea reflection point is P ′, the cornea center is C, the straight line connecting the light source and the cornea center C is s ′, the intersection of the straight line s ′ and the cornea surface is Q, and the angle formed by the straight line s ′ and the distant gaze is β Where P′P = (QC−QP ′) · sin β is a distance P′P from the pupil center to the corneal reflection point P ′.
14. The method of measuring an eyeball rotation point according to claim 12, wherein the position of the pupil center is calculated by correcting the corneal reflection point P ′ with the P′P. The light emitting surface of the light source is provided with a detachable dimming filter,
The eyeball rotation point measuring method according to any one of claims 12 to 14, wherein a near gaze point that causes the subject to gaze is marked on a surface of the light reduction filter.   The eyeball rotation according to any one of claims 12 to 14, wherein a near gaze point index is not provided, and the position information of the near gaze point is acquired and used as data of a distance to a preset point instead of the index. Measuring method. Using eyeglasses provided with eyeglass reference points at symmetrical positions, a stereo camera, a light source with a near gaze index marked on the back side, and a computer for analysis, the subject's gaze line and eyeglass lens An eye point measuring device for measuring an eye point composed of intersections,
The analysis computer is
An imaging process of causing a subject wearing the glasses to gaze at a distance and causing the light source to emit light, and shooting a glasses reference point and a corneal reflection point with a stereo camera,
A position information acquisition step of analyzing the positions of the spectacle reference point and the corneal reflection point from the captured image;
From the analyzed corneal reflection point, the pupil center acquisition step of calculating the pupil center position of the subject,
A gaze line acquisition step of calculating a horizontal straight line extending in the front-rear direction from the calculated pupil center as a gaze line during distant gaze,
Measure the distant gaze by performing
An imaging step of causing a subject wearing the glasses to gaze at a light emitting surface of the light source and causing the light source to emit light, and photographing an eyeglass reference point, a corneal reflection point, and the near gaze point index with a stereo photographic device,
From the captured image, a position information acquisition step of analyzing the position of the near gaze point from the eyeglass reference point and the corneal reflection point, and the near gaze index,
Pupil center acquisition step with the analyzed corneal reflection point as the pupil center,
A gaze line acquisition step of calculating a straight line passing through the analyzed pupil center and near gaze point as a gaze line at the time of near gaze,
Measure the near gaze by running
The position of the spectacle lens is calculated from the analyzed spectacle reference point, and the intersection of the calculated spectacle lens and the measured distance gaze and near gaze is calculated as a distance eye point and a near eye point, respectively. An eye point measuring device. The position information acquisition step in the measurement of the near gaze line includes an image magnification correction step in which the magnification of both images is made the same from the position of the eyeglass reference point in the image at the distance gaze and the image at the near gaze. The eye point measuring device according to claim 17, wherein: In the measurement of the distant gaze, the pupil center acquisition step is performed for each of the planar view and the side view.
The cornea reflection point is P ′, the cornea center is C, the straight line connecting the light source and the cornea center C is s ′, the intersection of the straight line s ′ and the cornea surface is Q, and the angle formed by the straight line s ′ and the distant gaze is β Where P′P = (QC−QP ′) · sin β is a distance P′P from the pupil center to the corneal reflection point P ′.
The eye point measurement device according to claim 17 or 18, wherein the eye point measurement device calculates the position of the pupil center by correcting the corneal reflection point P 'by P'P. The light emitting surface of the light source is provided with a detachable dimming filter,
The eye point measuring device according to any one of claims 16 to 19, wherein a near gaze point to be observed by a subject is marked on a surface of the dimming filter. The analysis computer further performs a near gaze reacquisition step,
The near gaze reacquisition step includes
The subject's eye rotation point is calculated from the intersection of the measured distance gaze and near eye gaze, and the near gaze point newly set by the operator and a straight line passing through the calculated eye rotation point are newly 21. The eyepoint measurement device according to claim 16, wherein the eyepoint measurement device calculates the gazing line.   The near gaze point index is not provided, and the position information of the near gaze point is acquired and used as data of a distance to a preset point instead of the index. Eye point measuring device.