Iris recognition device improving iris image quality of mobile terminal

Abstract

The invention provides an iris recognition device improving the iris image quality of a mobile terminal. The iris recognition device comprises an infrared light transmitting unit, an image collecting unit, a feedback module, a power module and an image processing unit. The infrared light transmitting unit comprises one or more sets of infrared lamps and a concave lens in the infrared light transmitting direction, infrared light can be sent out with a first divergence angle, and the first divergence angle is larger than the field angle of the image collecting unit. The image collecting unit is used for collecting iris images of human eyes and can convert light signals into digital signals, digital images are formed, meanwhile, a synchronous control signal is provided for the infrared light transmitting unit, and the infrared light transmitting unit is controlled to work. The image processing unit is used for processing the shot human eye iris images and sending corresponding control signals to other modules according to a processing module. The feedback module is used for providing human-machine interactive feedback signals. The power module is used for providing a power source for the infrared light transmitting unit. The distance between the infrared light transmitting unit and the image collecting unit is at least 5 mm.

Description

technical field [0001] The invention relates to an iris recognition device and a control method thereof, in particular to an iris recognition device for a mobile terminal and a mobile terminal including the iris recognition device. Background technique [0002] The personal information security and network interaction information security issues of mobile devices (such as mobile phones, tablet computers, laptops, etc.) are becoming more and more prominent. In order to ensure information security, many manufacturers have integrated various identification devices on mobile devices. For example, mobile devices have successfully integrated face recognition or fingerprint recognition devices for identification. [0003] The iris is an integral part of the eye, the ring of tissue between the pupil and the sclera, and the pattern of the iris varies from eye to eye and stays the same throughout life. Therefore, compared with face recognition and fingerprint recognition technologie...

AI Technical Summary

Problems solved by technology

[0004] However, the current front-end image acquisition unit configured on mobile terminals is mainly used for Selfie functions, and only supports visible light imaging, and infrared light is removed by filters; and iris recognition requires near-infrared imaging, and infrared light must be able to reach image sensor chip

Therefore, the existing front-end image acquisition unit of the mobile terminal cannot directly support iris recognition, and it is necessary to add an infrared light emitting unit light, such as a high-brightness infrared LED light, and modify the existing front-end image acquisition unit module to support iris recognition

[0005] After adding the infrared light emitting unit lamp, if the user wears glasses and uses the iris recognition function, from the captured image, the illuminating light will form a light spot on the glasses lens. When the light spot happens to be in the iris area, it will block the iris itself. texture, which affects the quality of the iris image

Due to the limited battery capacity of mobile phones, the infrared light emitting unit lamps generally installed on mobile phones use low-power LEDs. When shooting the iris of a user wearing glasses, due to the scattering, reflection and absorption of infrared light by the glasses lens, It will reduce the infrared light energy reaching the sensor chip, reduce the signal-to-noise ratio, and cause the iris texture to be unclear, thus affecting the quality of the iris image

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