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In the late 80ths we constructed a light fibre interferometer, which could measure the voltage-induced thickness variations of piezoelectric samples down to some few picometres. The principle of the interferometer is explained and four methods to minimize noise. With this sensor, we started a home-made PFM in February 1993. The very first pictures are shown together with locally measured polarization...
We report on novel approaches using scanning force methods [i.e. piezoresponse force microscopy (PFM), Kelvin probe force microscopy (KPFM) and pull-off force spectroscopy (PFS)] in order to deduce the local dielectric and polarization properties of PZT thin films both at outer and inner interfaces with < 50 nm lateral resolution. We show that the polarization profile into the depth of the PZT...
Arbitrary orientation and sparse data content are common characteristics of torn document. To ensure accuracy and reliability in computer-based analysis, content-zone segmentation is required. In our previous work, we studied segmentation of handwritten and printed text. A questioned document-piece in the form of an office note, however, might also contain non-text data like logos, graphics, and pictures...
Performance of a pattern recognition system depends strongly on the employed feature-selection method. We perform an in-depth analysis of two main measures used in the filter model: the correlation-feature-selection (CFS) measure and the minimal-redundancy-maximal-relevance (mRMR) measure. We show that these measures can be fused and generalized into a generic feature-selection (GeFS) measure. Further...
The quality of the feature selection algorithm is one of the most important factors that affects the effectiveness of an intrusion detection system (IDS). Achieving reduction of the number of relevant traffic features without negative effect on classification accuracy is a goal that greatly improves the overall effectiveness of the IDS. Obtaining a good feature set automatically without involving...
The forensic investigation of a questioned signature written on a piece of paper is a challenging task. Electronic pen-tablets for recording writing movements are considered valuable tools to assist in this effort. However, little is known about the precision and reliability of such electronic devices that are not intended as forensic equipment originally. Moreover, very few studies are conducted...
A two-stage approach for word-wise identification of English (Roman), Devnagari and Bengali (Bangla) scripts is proposed. This approach balances the tradeoff between recognition accuracy and processing speed. The 1st stage allows identifying scripts with high speed, yet less accuracy when dealing with noisy data. The advanced 2nd stage processes only those samples that yield low recognition confidence...
A new two-stage indexless search procedure is presented that makes use of the constrained edit distance in IDS misuse detection attack database search. The procedure consists of a preselection phase, in which the original dataset is reduced and the exhaustive search phase for the database records selected in the first phase. The maximum number of consecutive deletions represents the constraint. Besides...
In this paper, an alternative approach to the non-linear filtering of mathematical morphology for color and multi-spectral images based on the Pareto-dominated hypervolume measure is presented. Parteo-set theory is studied in this context, and among others, successfully implemented in the morphological filtering of color images. The demand to assess the quality of a multi-objective optimization algorithms,...
A new search procedure is presented that makes use of the constrained edit distance in the preselection of the areas of the digital forensic search space that are interesting for the investigation. The constraints regard the maximum numbers of consecutive deletions and insertions. The original algorithm for computing the constrained edit distance is modified in order to be used in forensic search...
In recent years, mathematical, statistical and computer science methods have found extensive application in developing new procedures for crime investigation, prosecution and the enforcement of law. Computer-based methods have also become important tools for performing certain forensic functions. Yet, knowledge and intuition of the human expert plays a central role. This paper gives a brief overview...
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