Iris identification device capable of preventing glasses reflect light interference

Abstract

The invention belongs to the field of biological identification and discloses an iris identification device capable of preventing glasses reflect light interference. The iris identification device capable of preventing glasses reflect light interference comprises a lens, an image sensor and a fill-in light source. The image sensor is positioned behind the lens, and an included angle g between an incident light of the fill-in light source and the central axis of a glasses lens is accordant with a formula that 2arctan (Ltan theta / R) +theta<=g<90 degrees, wherein L refers to a distance between the lens surface and the glasses lens, R refers to a curvature radius of the glasses lens, and theta refers to a field angle of the lens. Compared with the prior art, the iris identification device capable of preventing glasses reflect light interference has the advantages that influences of glasses reflection on iris imaging can be avoided by adoption of the fixed fill-in light source, structural simplicity is achieved, and identification efficiency and user experience are improved.

Description

Technical field [0001] The invention relates to the field of biological recognition, in particular to an iris recognition device that prevents interference from reflection of glasses. Background technique [0002] Iris recognition is a biometric technology based on the detailed features of the iris area of ​​the human eye. It has attracted more and more attention in the information security field because of its high accuracy and uniqueness. Since the first available iris recognition system appeared in the 1990s, the iris recognition device has developed rapidly and has been widely used in the fields of finance, national defense, justice, and daily life. People's attention to the iris recognition device on the market has also changed from the function and Performance index requirements shift to user experience requirements, requiring the iris device to recognize farther and farther, faster and faster, and adapt to a wider range of users. When the iris device recognizes, the user n...

AI Technical Summary

Problems solved by technology

Since the first available iris recognition system appeared in the 1990s, iris recognition devices have developed rapidly and have been widely used in fields such as finance, national defense, justice, and daily life. Performance index requirements are shifted to user experience requirements, requiring iris devices to recognize farther and farther, faster and faster recognition speeds, and adapt to a wider range of users, among which iris device recognition requires users to cooperate to take off their glasses and wear glasses for recognition Poor experience that largely inconveniences and displeases users

[0003] The main reason why most iris recognition devices require users to take off their glasses is because the glasses lens will reflect the light emitted by the supplementary light source, and the reflected light will be converged and imaged into the iris recognition device, resulting in a large number of iris area images acquired. Light spots, these light spots are very likely to block the texture information of the iris area, making it impossible to get enough iris information from the acquired iris image for identification

[0004] In order to solve the experiential problems caused by the reflection of glasses, the relevant iris device system patent mentioned the use of multi-angle and multiple supplementary light sources. By controlling multiple supplementary light sources at different angles, the supplementary light sources are turned on in a certain order and quantity. , take images of the user under the light source at different angles and record the reflection information of the glasses, so as to determine which angles of the supplementary light source are turned on to ensure the best iris image for recognition, but this method is not only complicated and requires multiple supplementary lights Light source, the recognition speed is slow and the recognition success rate is also low

For the solution of multiple supplementary light sources, follow-up studies have registered as many iris feature images as the number of supplementary light sources during iris registration, and performed recognition by changing the supplementary light source during recognition to improve the recognition speed and success rate. Therefore, iris registration will be cumbersome, the amount of stored data will be large, and the entire recognition processing mechanism will be complicated.

[0005] There are also some iris recognition devices that use polarizers to filter out light from other directions and only keep light from a specific direction to enter the imaging device. However, this method greatly weakens the amount of incoming light and affects the overall light intensity. It must be passed Increasing the number of light sources and increasing the intensity of light sources will increase the overall power consumption of the device

[0006] In order to solve this problem, the current iris recognition devices on the market consider the design of the device structure. For example, the device is designed to be rotatable. When the user wears glasses for recognition, the device can be rotated by itself so that the device is at a certain angle to the human eye. Reduce the occlusion of the iris image by the reflective spot, but this method requires the cooperation of the user, and the angle is not easy to find

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