Integrated noncontact-type hand characteristic image acquisition system

Abstract

The invention provides an integrated noncontact-type hand characteristic image acquisition system, which is composed of a user interface module unit, an optical module unit, a light source and camera control circuit unit, an A / D (Analog / Digital) conversion module unit and a storage module unit, wherein the user interface module unit is connected with the optical module unit which is respectively connected with the light source and camera control circuit unit and the A / D conversion module unit, and the A / D conversion module unit is connected with the storage module unit; the system of the invention acquires the images of palm prints, palm veins and hand back veins simultaneously under the situation that the palm of an image acquiring target comes into no contact with the acquisition equipment and is used for the biological characteristic recognition of human body based on hand characteristics. The system acquires the images of human hand in a noncontact manner, has excellent user acceptability, high degree of integration and superior user interface, and further has the advantage that: the hand of the image acquiring target does not need to be put under restriction, and the placement of the hand is achieved under the guidance of an auxiliary device, which avoids inferior image quality caused by excessive freedom of the hand of the image acquiring target.

Description

(1) Technical field [0001] The invention relates to image processing technology, in particular to an integrated non-contact hand characteristic image acquisition system. (2) Background technology [0002] Hand image acquisition is a very important part of the human biometrics recognition system based on hand images. At present, the more popular method is to use a CCD camera, fix the camera in a relatively closed space, and set a specific light source in the space. Analog signals are converted into digital signals by A / D conversion equipment and stored in memory. In terms of user interface, the subject needs to place his hand on the device. Auxiliary positioning mechanisms such as panels and brackets are set on the device to help the subject place his palm, while blocking external light and ensuring the quality of image acquisition. This type of hand image acquisition equipment needs the palm of the subject to be in contact with the surface of the equipment, which constrains...

AI Technical Summary

Problems solved by technology

However, in the existing non-contact human hand image acquisition system, the human hand is usually completely suspended in the air, which leads to a large degree of freedom of the human hand, which makes the collected images show a large degree of inconsistency in terms of clarity, angle, and illumination. , it is difficult to complete high-precision human biometric recognition on such images with existing image processing technology

In addition, the existing hand image acquisition equipment usually can only collect one hand feature, even if it can collect multiple hand features at the same time, most of these devices are not highly integrated and inconvenient to use

These shortcomings limit the popularity of human biometric recognition systems based on hand features to a certain extent.

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