CABEZA-GUILLÈN, Jesús-Miguel,MANI, Subhashini,GAMPERLING, Michael
申请号：
HK18113131
公开号：
HK1254067B
申请日:
2018.10.15
申请国别(地区):
HK
年份:
2020
代理人:
摘要：
In a method for determining a distance visual point on a spectacle lens (12, 14) which is receivable in a spectacle frame (16) and which has a frame plane (69), an image, lying in an image plane (42), of at least one portion of a spectacle frame (16) worn by a subject (68) is captured by a camera (36) with an optical axis (50) while the subject (68) looks into the camera (36) with a viewing direction (17, 17') of at least one eye (60, 62) passing through the frame plane (69). In so doing, a pantoscopic angle (α') of the spectacle frame (16) related to the position of the image plane (42) is established. The pantoscopic angle (α') is corrected in accordance with the captured inclination angle (γ) of the image plane (42) in relation to the vertical direction (46) so as to form a pantoscopic angle (α) related to the vertical direction (46). A head rotation angle (β) of the head of the subject (68), formed by the optical axis (50) of the camera (36) with a plane perpendicular to the distance line (54) of the pupils (56, 58) of the eyes (60, 62) of the subject (68), is established and the head rotation angle (β) is corrected in accordance with the detected inclination angle (γ) of the image plane (42) in relation to the vertical direction (46) so as to form a corrected head rotation angle corresponding to a horizontal alignment of the optical axis (50) of the camera (36). The distance visual point (11') is then determined by analysing the image lying in the image plane (42), taking into account the corrected head rotation angle (β') corresponding to a horizontal alignment of the optical axis (50) of the camera (36).
