US 10,175,507 B2Granted

Loupe mounting position determination method in binocular loupe device, and system

AssigneesShoichi Nakamura, Acp Japan Co., Ltd.

InventorShoichi Nakamura

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Abstract

In assembling a binocular loupe device, a loupe of the binocular loupe device is attached to an appropriate position at a correct angle according to a pupil position of a user in a near vision state. A rectangular, transparent measurement assisting plate fixed to a frame before attachment of a loupe is worn by a user, and the face of the user in a near vision state is photographed by a camera from a work object point P to obtain a first image. The first image is subjected to arithmetic processing by a computer to measure, on the first image, coordinate positions of respective four vertexes of the measurement assisting plate and coordinate positions of respective left and right pupils of the user in the near vision state, and determines the loupe attachment position and/or loupe attachment angle on a plane of the plate member from the measured coordinate positions.

Claims15

Dependent claims

A loupe attachment position determination method for determining an attachment position of a pair of left and right loupes to be attached to a holder worn on a head or face of a user so as to correspond to left and right eyes of the user, the method comprising:

a step of preparing the holder to which a transparent and flat plate member having a substantially rectangular shape is attached such that a plane of the plate member is orthogonal to a far line of sight of the user when the holder is worn;
a step of acquiring a first image including the whole plate member and left and right pupils of the user in a near vision state within the plane of the plate member by photographing the face of the user, in the near vision state and when the holder is worn at the head or face of the user, from a work object point on near lines of sight of the left and right eyes;
a step of measuring, on the first image, coordinate positions of respective vertexes of the plate member and coordinate positions of the respective left and right pupils in the near vision state;
and
a step of determining the loupe attachment position and/or a loupe attachment angle on the plane of the plate member by calculating coordinates of points at which the near lines of sight of the user directed toward the work object point pass through the plate member based on the measured coordinate positions of respective vertexes of the plate member and the coordinate positions of the respective left and right pupils,
wherein in the step of determining the loupe attachment position, coordinate positions of respective vertexes of a virtual plate member before being projected on a plane of the first image, which is obtained by rotating the plate member on the first image about a straight line passing through centers of the left and right pupils such that the plane of the plate member faces directly forward are calculated based on the measured coordinate positions of the respective vertexes of the plate member, and based on the calculated coordinate positions of the respective vertexes of the virtual plate member, the loupe attachment position on the plane of the plate member is determined.

3 more elements

A loupe attachment position determination system for determining an attachment position of a pair of left and right loupes to be attached to a holder adapted to be worn on a head or face of a user so as to correspond to left and right eyes of the user, the system comprising:

a transparent and flat plate member having a substantially rectangular shape and attached to the holder such that a plane of the plate member is orthogonal to a far line of sight of the user in which the holder is worn;
a camera;
and
an arithmetic processing device for processing an image photographed by the camera,
wherein when the holder with the plate member is adapted to be worn on the head or face of the user, the camera is operated to photograph the face of the user in a near vision state from a work object point on near lines of sight of the left and right eyes of the user, and
the arithmetic processing device
acquires a first image, including the whole plate member and left and right pupils of the user in the near vision state within the plane of the plate member, from the image photographed with the camera,
calculates coordinate positions of respective vertexes of a virtual plate member before being projected on a plane of the first image, which is obtained by rotating the plate member on the first image about a straight line passing through centers of the left and right pupils such that the plane of the plate member faces directly forward based on measured coordinate positions of the respective vertexes of the plate member;
and
determines a loupe attachment position on the plane of the plate member based on the calculated coordinate positions of the respective vertexes of the virtual plate member.

7 more elements

Dependencies are inferred from the claim text.