Abstract: A method and a device for estimating a position of a device by using an optical signal through converting a linearly polarized optical signal to a plurality of electric signals using a plurality of photoelectric devices, estimating a moving distance of the device from a reference position by using the plurality of electric signals, and estimating an orientation angle of the device with respect to a reference direction by using the plurality of electric signals are provided.

Abstract: Provided is a finger vein authentication which recognizes, compares and distinguishes a user's finger vein at low capacity/high speed through a method for analyzing a level set curvature. In order to achieve the above object, there is provided a finger vein authentication system including a light source unit configured to emit near-infrared light; an optical filter unit configured to allow only light with a specific wavelength in light incident from the light source unit to penetrate therethrough; a CCD camera unit configured to capture an image including an user's finger and then to convert the captured image into an electrical signal; a memory unit configured to store a level set curvature program, the level set curvature program performing an operation for extracting a finger vein pattern from the image including the finger using a level set curvature; and a control unit configured to drive the level set curvature program.

Abstract: Provided is a finger vein authentication which recognizes, compares and distinguishes a user's finger vein at low capacity/high speed through a method for analyzing a level set curvature. In order to achieve the above object, there is provided a finger vein authentication system including a light source unit configured to emit near-infrared light; an optical filter unit configured to allow only light with a specific wavelength in light incident from the light source unit to penetrate therethrough; a CCD camera unit configured to capture an image including an user's finger and then to convert the captured image into an electrical signal; a memory unit configured to store a level set curvature program, the level set curvature program performing an operation for extracting a finger vein pattern from the image including the finger using a level set curvature; and a control unit configured to drive the level set curvature program.