Hardware circuit for implementing image smoothing process in fingerprint identification system

Abstract

The invention relates to a hardware circuit of achieving the slid process in the image processing field of the fingerprint identification system. The slid processing part of the background technique as the software form has the disadvantages that: the speed of the software processing is slow in the same clock frequency. The invention completes the image slid processing with the hardware circuit, which comprise the following steps: acquiring the collected fingerprint image data from the collecting part of the fingerprint image; dealing with the fingerprint image data according to I(I, j)=1/4( sigma I( i + k, j) + sigma I( i, j + h)) I (wherein k=-1,1, h=-1,1); getting the new data; saving the new data in the reservoir for the Gabor filtration parts. The invention provides the rapid processing speed and the strong transplantation.

Description

technical field The invention relates to a hardware circuit for realizing image smoothing processing in a fingerprint identification system, and belongs to the field of image processing in a fingerprint identification system. The purpose of image smoothing is to reduce the influence of the gray scale deviation between fingerprint ridges and valleys and the contrast of different fingerprint images. Background technique With the development of fingerprint identification technology, the requirements for fingerprint identification algorithm are getting higher and higher, not only require better true rejection rate (FRR) and false recognition rate (FAR), but also higher speed. Among them, the result of image smoothing has a great influence on the extraction of fingerprint feature points. A typical embedded fingerprint identification system is composed of a fingerprint sensor and a processor as the core. The fingerprint sensor collects the fingerprint imag...

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