Iris recognition camera module
2020-04-09
At present, most of the commercial iris recognition camera module systems use two user self-positioning technologies, one is to use the distance sensor to perceive the distance of the person, and the other is to use audio or indicator light or buzzer to remind the person to approach or stay away from the camera to obtain a clear iris image. The second is to use a mirror or LCD display to intuitively observe your position, so as to adjust your position to the appropriate acquisition area and collect clear images.
Iris recognition camera moduleImage acquisition first requires aligning the human eye to be identified with the iris camera, adjusting the position of the human eye so that it enters the acquisition area, so as to obtain high-quality, clear images. In order to facilitate the adjustment of the position of the human eye, a plane mirror feedback device for the positioning of the human eye will be placed in front of the ordinary camera. Although it is intuitive to locate the position of the human eye with a flat mirror, it is difficult for the user to find an effective area for image acquisition when the distance between the human eye and the lens is far away from the flat mirror. The adjustment of the position of the human eye takes a long time, and the user experience is not good enough. If you want to feedback binocular images, you need a flat mirror with a large area, so that the size of the iris recognition camera module acquisition device will become larger, and it will be difficult to miniaturize the device.
In order to determine the position of the human eye and facilitate the acquisition of high-quality images, the prior art arranges a convex mirror in front of the camera, the relative position of the convex mirror and the iris camera is fixed, the convex mirror is provided with an iris camera viewfinder, the relative position of the convex mirror is adjusted by the iris camera and the subject according to the size and position of the optical image of the subject formed in the convex mirror, and after this position or distance, the iris camera shoots. However, since the iris recognition camera module camera captures objects through the viewfinder, the angle of view of the iris camera is limited. At the same time, the position of the iris camera is also limited.
In the prior art, due to the auxiliary positioning of the human eye device, no effective solution has been proposed to limit the field of view when the iris image is collected by the iris recognition camera module camera.
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