Patent ID: 8333475
Filing Date: 2012-12-18
Classification: A61B,G06K

Abstract:
1. An electro-oculography measuring device which outputs an electro-oculography signal indicating a gaze direction of a user, said electro-oculography measuring device comprising: an electro-oculography measuring unit configured to measure an electro-oculography original signal indicating an electro-oculogram resulting from eyeball movement of the user; a capturing unit configured to capture a picture in the gaze direction of the user; a drift estimation processing unit configured to estimate a drift signal indicating a temporal baseline drift of the electro-oculography original signal; and a subtraction unit configured to subtract the drift signal estimated by said drift estimation processing unit from the electro-oculography original signal measured by said electro-oculography measuring unit, so as to output an electro-oculography signal, wherein said drift estimation processing unit includes: an electro-oculography change amount calculating unit configured to calculate, based on a past electro-oculography signal output from said subtraction unit, an electro-oculography change amount indicating an amount of change in electro-oculogram over a predetermined time period in past; a motion vector estimating unit configured to estimate a motion vector of a moving object included in the picture captured by said capturing unit, the motion vector indicating a motion of the moving object in the predetermined time period in the past; a drift change amount estimating unit configured to estimate a drift change amount assuming that a change in the gaze direction indicated by the electro-oculography change amount follows the motion of the moving object indicated by the motion vector, the drift change amount being an amount of change in drift signal over the predetermined time period in the past; and a drift estimating unit configured to estimate the drift signal by adding the drift change amount estimated by said drift change amount estimating unit to a past drift signal.