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In this paper, we implemented a practical digital security system that combines digital correlation, wavelet compression with digital images preprocessing. The system has a biometric sensor; it is charge to capture the images and to digitize them. These images are preprocessed using wavelet based image compression and are skeleting for to stand out elements of the image that are considered of greater importance, eliminating the undesired signals, that because of the method of acquisition, or the conditions under which it was captured they appear in the same one. These images are stored in the data base, which to the being passed through different algorithms makes a compound filter, that serves as reference or pattern fingerprint for making the comparisons. These comparisons are showing in a graph where are observed amplitude different for each one from fingerprint, this make with help Fourier transformed and the correlation operations that allows quantifying the degree of similarity between two images. Depending on the results thrown by the system at the time of comparing a new fingerprint with the compound filter the access will be allowed or not the user.

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