Image analysis – Applications
Patent
1997-01-02
1999-11-16
Chang, Jon
Image analysis
Applications
382199, 382288, 396 51, 351210, G06K 900
Patent
active
059871512
ABSTRACT:
A visual axis detecting apparatus includes a two-dimensional image sensor having a plurality of detecting lines for receiving light from an eye, a first calculator for (i) detecting a change of luminance for neighboring pixels on the detecting lines, for (ii) calculating a number of pixels whose luminance is changed and a position of a center of gravity of the change of luminance as coordinates of an edge of a pupil of the eye from an amount of the change of luminance, for (iii) obtaining a plurality of coordinates of the edge of the pupil from the plurality of detecting lines, and for (iv) performing a correcting calculation of the plurality of coordinates of the edge of the pupil on the basis of an aspect ratio of a pixel of the image sensor, a second calculator for calculating a position of a center of the pupil from the plurality of coordinates of the edge of the pupil corrected by the first calculator, and a visual axis calculator for calculating a position of a visual axis by using the position of the center of the pupil.
REFERENCES:
patent: 4595990 (1986-06-01), Garwin et al.
patent: 5016282 (1991-05-01), Tomono et al.
patent: 5070401 (1991-12-01), Salvati et al.
patent: 5231674 (1993-07-01), Cleveland et al.
patent: 5296888 (1994-03-01), Yamada
English Translation of Japanese Laid--Open Patent Application No. 4-347131, Aug. 1994.
Bani-Hashemi, "Finding the Aspect-Ratio of an Imaging System." Proceedings 1991 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, pp. 122-126, Jun. 1991.
Canon Kabushiki Kaisha
Chang Jon
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