Finger vein image enhancement method based on image processing

Abstract

The invention discloses a finger vein image enhancement method based on image processing. The method comprises the following steps: 1) acquiring an originally acquired finger vein region-of-interest picture; 2) filtering image noise by using mean filtering and median filtering to obtain a denoised image; 3) enhancing the contrast of the denoised image by using homomorphic filtering to obtain a contrast-enhanced image; 4) enhancing texture details of the contrast-enhanced image by using directional texture filtering to obtain a texture-enhanced image; and 5) correcting the gray level distribution of the stretched image by using gamma, and enhancing the texture discrimination of the filtered image so as to further enhance the texture pixel value of the filtered image, thereby completing theenhancement of the finger vein image. The influence of equipment noise and finger dirt during collection is effectively avoided, meanwhile, the condition of poor contrast caused by background environment illumination is avoided, the response of vein lines is enhanced through the direction valley filter, and the problem of finger vein image enhancement under the condition of low contrast is effectively solved.

Description

technical field [0001] The invention relates to the field of finger vein biometrics, in particular to a method for enhancing finger vein images based on image processing. Background technique [0002] Finger vein recognition is a biometric technology for identification based on human finger vein feature information. The feature of finger vein recognition comes from the hemoglobin in the blood flowing in the finger veins, which is stealthy and alive. The image of the finger vein is obtained through a device based on near-infrared light collection, and the vein area is reflected in the darker lines on the image. That is, the venous blood vessel area collected by the device. However, it is limited by the quality of the acquisition equipment and environmental factors such as background light and ambient temperature, which cause finger capillary constriction to affect the image. As a result, in the collected finger vein images, the vein area information is not obvious, and it i...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and propose a finger vein image enhancement method based on image processing, which breaks through the problem that the traditional image enhancement method is not targeted at enhancing finger vein images. The main purpose is to enhance finger vein image enhancement. The texture information of the vein in the vein ROI is to enhance the part that truly reflects the difference between the finger veins

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