Automatic focusing iris image imaging device for iris recognition and control method thereof

Abstract

The invention relates to an automatic focusing iris image imaging device for iris recognition, which comprises an automatic focusing imaging light path system, a lighting system, a distance measuring system and a control system, wherein the automatic focusing imaging light path system comprises an optical bandpass filter, a liquid state optical lens, a fixed focus optical imaging lens and a CMOS image sensor with megapixel resolution ratio; the lighting system comprises at least two groups of LED light sources with the centre wavelength of 750 to 850nm; the distance measuring system comprises an infrared distance measurement sensor or a ultrasonic distance measurement sensor; and the control system comprises a drive plate and an image processing mainboard. The invention also discloses a control method for the automatic focusing iris image imaging device for iris recognition. The invention can fast acquire the iris texture image with high quality within 0.1 second.

Description

technical field [0001] The invention relates to an automatic focusing iris image imaging device for iris recognition and a control method thereof. Background technique [0002] The "Apparatus and Method for Combined Face / Iris Optical Imaging" with the application number 200610087604.X is the applicant's earlier patent application. In the actual use process, it is found that there are still the following shortcomings: the complexity of the optical system and the motor mechanical control system of the iris image imaging device, the manufacturing process requirements and the cost are very high, which reduces the reliability of the actual large-scale application , and the volume of the device is too large. Another important issue is the time required to obtain high-quality iris texture images, especially in actual large-scale applications, because users use it for a short time and cannot keep relatively still for more than 1 second, so some users (especially first-time users) ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an automatic focusing iris image imaging device and its control method for iris recognition. The present invention mainly improves the complexity of the optical system and motor mechanical control system of the iris image imaging device for iris recognition. , reliability, reduce manufacturing cost, and reduce device size; another important improvement issue is the time required to obtain high-quality iris texture images, especially in actual large-scale applications due to the short use time of users and the inability to keep relatively static for a long time , so the time required to obtain a high-quality iris texture image must be completed quickly within 0.1 seconds (100ms)

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