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|United States Patent||5,481,622|
|Gerhardt , et al.||January 2, 1996|
An eye-tracking system determines the position of a user's pupil and maps this position into a point of regard of the user on an interface device, such as a display screen, or other real-world object by a system comprising a camera for acquiring a video image of the pupil; a frame grabber coupled to the camera for accepting and converting analog video data from the camera to digital pixel data; a computer coupled to the frame grabber for processing the digital pixel data to substantially determine the position of the pupil; a display screen coupled to the computer; and a support connected to the camera and display screen for fixing the relative physical positions thereof relative to the user's pupil. The processing performed by the computer may include the selection of a first pixel intensity threshold for the segmentation of the digital pixel data into first and second groups, where the total pixel area of the first group is selected to be substantially equal to a pre-determined value expected to correspond to the area of a user's pupil. The system may be calibrated by the user's following a cursor on the display screen while the system measures the pupil position for known locations of the cursor.
|Inventors:||Gerhardt; Lester A. (Clifton Park, NY), Sabolcik; Ross M. (Austin, TX)|
Rensselaer Polytechnic Institute
|Filed:||March 1, 1994|
|Current U.S. Class:||382/103 ; 345/158; 382/171; 382/291; 708/141|
|Current International Class:||A61B 3/113 (20060101); G06F 3/00 (20060101); G06T 7/00 (20060101); A61F 9/00 (20060101); G06K 009/00 ()|
|Field of Search:||382/1,9,48,100,103,117,171,173,291 348/78 345/8,157,158 364/709.1,709.11 351/206,209,210,245|
|3236578||February 1966||Mackworth et al.|
|3542457||November 1970||Balding et al.|
|4595990||June 1986||Garwin et al.|
|4625329||November 1986||Ishikawa et al.|
|4648052||March 1987||Friedman et al.|
|4748502||May 1988||Friedman et al.|
|4852988||August 1989||Velez et al.|
|4988183||January 1991||Kasahara et al.|
|5002385||March 1991||Kasahara et al.|
|5016282||May 1991||Tomono et al.|
|5034618||July 1991||Akeel et al.|
|5094521||March 1992||Jolson et al.|
|5189512||February 1993||Cameron et al.|
Cunningham, R., "Segmenting Binary Images", Robotic Age, Jul./Aug. 1981, pp. 4-19. .
Kitter, J., Illingworth, J., & Foglein, J., "Threshold Selection Based on a Simple Image Statistic", Computer Vision, Graphics, and Image Processing, 1985, vol. 30, pp. 125-147. .
Haralick, R. M. & Shapiro, L. G., "Survey: Image Segmentation Techniques", Computer Vision, Graphics and Image Processing, 1985, vol. 29, pp. 100-132. .
"The Eyegaze Computer System", LC Technologies, Inc., Product Brochure, Aug. 1991, (13 pages). .
Haralick, R. M., Sternberg, S. R. & Zhuang, X., "Image Analysis Using Mathematical Morphology", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-9, No. 4, Jul. 1987, pp. 532-550..