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Based on NTFS file system, this paper proposed an algorithm of reconstructing directory tree above deleted files. Further more , On the basis of detailedly analyzing the theory of internal structure of the NTFS file system, this paper clarified the storage principle of Data Runs in attribute 80 of MFT. Finally, this paper analyzed some exceptions occurred during deleting files, and compared the self-researched data recovery software named SmoothRecovery with EasyReocvery appeared in the market. The result shows SmoothRecovery is more excellent than EasyReocvery on the efficiency of implementation.

The paper introduces the application of filtering and enhancement based upon morphological wavelet transformation in fingerprint image preprocessing. For this method, a group of flat structuring elements is formed based upon the morphological wavelet transformation and used for correcting high frequency coefficient. Thus, the filtering and enhancement of image are achieved, without changing the overall pattern of fingerprint. The experiment result also shows a good effect of this algorithm for image filtering and enhancement in fingerprint image preprocessing.

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