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This paper presents a new design of irregular LDPC codes that supports arbitrary block length. We propose the efficient construction method when nonprime size sub-matrices are used. The problem where GCD (L1,L2) ≠ 1 that left unsolved has been tackled. We also consider the case GCD (L1,L2) = 1 but L1 or L2 is a nonprime number. The results show that our designed codes have superior performance compared...
In this paper we demonstrate the use of second derivative of Gaussian filters (SDG) together with pyramid technique for fingerprint image enhancement. The quality of enhanced image is measured by the success in core point detection employing poincare method. DB1-A of FVC-2004 database is used as an input in our experiment. It is found that the SDG works well and can offer the similar filtering performance...
This paper outlines the work on another design of a parity check matrix for Irregular LDPC codes. The design is based on the pattern of Modified Array and Interleaved Modified Array LDPC codes. The application of matrix transposition Quasi-cyclic shifting has resulted in the reduction of 1's. The designed matrix is suitable for codes with short and medium block lengths. The code rate of 0.56 at the...
This paper outlines a work on a design of parity check matrix for irregular LDPC codes. The design is based on the adjustment of the modified array LDPC codes and interleave-modified array LDPC codes. The code rate of 0.930 is obtained. LDPC codes based on this design suits the short and medium block length.
Based on the refinement of two existing techniques, this paper describes the work that introduced region of interest for more accurate fingerprint core point detection. Direction of curvature technique (DC) has been used in coarse core point detection whilst geometry of region (GR) technique is used in the fine finding of the core point. According to the experiment applied to FVC-2002 database, it...
Reed-Solomon decoders can be designed using time or frequency domain algorithms. The main advantage of the time domain method is its regular computational structure, an attractive feature for a flexible VLSI implementation. The main disadvantage of this is the relatively high computation count, hence it is important to find a means of reducing the computational complexity of the time domain method...
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