Double-eye iris image acquisition method and device based on single camera

Abstract

The invention relates to a double-eye iris image acquisition method and device based on a single camera, and the method employs the single camera to achieve the acquisition of double-eye region images, and employs a morphology and corner detection algorithm to detect the reflection bright spots of human eyes and the positions of canthus in real time, thereby achieving the real-time positioning of double pupils. The measured interpupillary distance is used for calculating the object distance between a person and the sensor in real time, the object distance serves as a feedback signal of a closed-loop control system and is sent to a stepping motor to drive an optical lens to move front and back so as to achieve self-adaptive focusing, clear binocular iris images are obtained, the binocular iris images are cut into left and right eye high-definition iris images in real time, and through subsequent algorithms such as preprocessing and the like, binocular iris recognition is completed in real time. According to the method and the equipment, the product hardware cost can be effectively reduced, the circuit design complexity of the equipment is reduced, the size of the terminal is reduced, and the iris registration and authentication speed is increased.

Description

[0001] This case is a divisional application, and the parent case is a Chinese application with application number 201110174198.1, whose invention name is "Single-camera binocular iris image acquisition method and device", and the filing date is June 27, 2011. technical field [0002] The present invention relates to the field of iris recognition and the field of optomechanical integration, in particular to a sensor for synchronous and self-adaptive recognition of binocular irises, a binocular positioning algorithm based on corner point detection, and automatic focus control for measuring interpupillary distance. The system is suitable for binocular iris images collection and identification equipment. Background technique [0003] Iris recognition is a high-precision, non-invasive, and easy-to-use biometric authentication technology. It is considered to be one of the most promising biometric authentication technologies and has a very broad market application prospect. [000...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to fundamentally solve the technical problems of high cost, large volume and complicated use process of binocular iris collection equipment currently on the market.

Based on this, the present invention adopts a single camera to collect binocular images at the same time, which solves the problem of automatic positioning and cropping of the human eye area of ​​interest in a large field of view, and realizes automatic focus control by measuring the interpupillary distance of the image and calculating the object distance. Cost, adaptive binocular iris recognition

Images