| 摘要 |
PROBLEM TO BE SOLVED: To prevent the imprecise detection of an pupil edge. SOLUTION: This device has differential arithmetic means (#03) for differencing an image signal, edge detecting means (#09) for determining the center-of- gravity position of the difference output to detect an edge position, and calculating range calculating means (#G03-#G06) for determining the range for calculating the center-of-gravity position from the difference output. The above calculating range is compared with a prescribed calculating range, and when the calculating range is wider than the prescribed calculating range, it shows that the rise of the eyelid is continued to the part of pupil edge, and the edge calculation by center of gravity is not performed at that time. |
