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Hardware circuit for implementing image smoothing process in fingerprint identification system

A technology of image smoothing and hardware circuit, applied in the direction of character and pattern recognition, computer components, instruments, etc., can solve the problems of slow speed and slow software processing speed, and achieve the effect of strong portability

Inactive Publication Date: 2007-11-28
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Using software to achieve image smoothing processing has the advantage of strong portability; the disadvantage is that the processing speed of the software is relatively slow

Method used

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  • Hardware circuit for implementing image smoothing process in fingerprint identification system
  • Hardware circuit for implementing image smoothing process in fingerprint identification system
  • Hardware circuit for implementing image smoothing process in fingerprint identification system

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Example

The technical solution of the present invention is an example, and for the sake of brevity, it will not be repeated here. The present embodiment, namely the technical solution of the present invention and its working principle will be described below in conjunction with FIG. 1. This embodiment uses the hardware circuit shown in Figure 1 to complete the image smoothing process in the fingerprint identification system.

Address generator module 1, acquiring required data module 2, average calculator module 3, SRAM address arbiter module 4, image smoothing controller module 5.

Input a pulse signal start from the address generator module 1, the image smoothing process begins, output the first address to be processed and the address valid signal, and transmit to the required data module 2; the required data module 2 obtains according to the input address The required four addresses, the obtained address and read signal are transmitted to the SRAM address arbiter module 4; the ...

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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...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 王洪陈文斌崔建明徐婷婷赖宗声
Owner EAST CHINA NORMAL UNIVERSITY
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