摘要:
A compact image steering and focusing device has a generally rectangular frame containing a pan/tilt mirror and at least one lens. There is a tilt plane bisecting the frame. A mirror drive motor is attached to the frame on one side of the tilt plane and a lens motor is attached to the frame on the other side of the tilt plane. The frame is rotatably attached to a stand and connected to a frame drive motor mounted on the stand. The device can fit behind the cover plate of an automated teller machine. This system is preferably used with a narrow field of view camera and two wide field of view cameras. Images from the wide field of view cameras are used to focus the narrow field of view camera on one eye of the automated teller machine user to identify the user by iris analysis and comparison to an iris image on file.
摘要:
A reliable method and apparatus for illuminating and imaging eyes uses multiple light sources producing multiple images of a subject each created under illumination by different illuminators. A composite image of the subject is formed by selecting pixels based upon their gray scale values or using pyramid image processing. A composite image can be created which is free of bright spots commonly caused by reflection of illumination from eyeglasses that may be worn by a subject or for which is free of dark shadows or which is free of both bright spots and dark shadows.
摘要:
Iris recognition is achieved by iris acquisition that permits a user to self-position his or her eye (216) into an imager's (200) field of view without the need for any physical contact, spatially locating the data defining that portion of a digitised video image of the user's eye that defines solely the iris thereof without any initial spatial condition of the iris being provided , and pattern matching the spatially located data defining the iris of the user's eye with stored data defining a model iris by employing normalised spatial correlation for first comparing, at each of a plurality of spatial scales, each of distinctive spatial characteristics of the respective irises that are spatially registered with one another to quantitatively determine, at each of the plurality of spatial scales, a goodness value of match at that spatial scale, and then judging whether or not the pattern which manifests solely the iris of the user's eye matches the digital data which manifests solely the model iris in accordance with a certain combination of the quantitatively-determined goodness values of match at each of said plurality of spatial scales.
摘要:
At least one wide field of view camera (3) and with an associated illuminator (6, 10) obtains sufficient images of a person to be identified so that x, y, z coordinates can be established for the expected position of that person's eye. The coordinates are used to direct a narrow field of view camera (16) and associated illuminators (21-23) to take an image of the eye (76, 78) that can be used for to identifying the person using iris verification and recognition algorithms. These illuminators are positioned and illuminated to eliminate or minimize specularities and reflections that obscure the iris (76).
摘要:
A reliable method of illuminating and imaging an eye through eyeglasses uses a carefully selected subset of multiple monochromatic light sources, a camera with an imager that exhibits minimal blooming, and a narrow-bandwidth optical bandpass filter to filter out most of the ambient illumination while passing most of the light from the system's own illuminator.
摘要:
A reliable method of illuminating and imaging an eye through eyeglasses uses a carefully selected subset of multiple monochromatic light sources, a camera with an imager that exhibits minimal blooming, and a narrow-bandwidth optical bandpass filter to filter out most of the ambient illumination while passing most of the light from the system's own illuminator.