Carrier evolution equation (continuity equation) of semi-conductor plays an essential role in simulation of laser interference and electrical damage induced by laser irradiation on charge coupled device (CCD). Solving the Poisson equation, which is coupled with the carrier evolution equation, is a necessary step to obtain the stable electronic field caused by doped atoms and the dynamic one caused by free carriers. In terms of carrier evolution simulation in high resolution-CCD, it is important to solve the Poisson equation promptly and efficiently. For this purpose, we adopt a boundary element method with convolution core combined with Gauss integral algorithm. In this method, we propose the pixel element model in which fast Fourier transform (FFT) is introduced so that the amount of calculation is greatly decreased compared with the finite difference method. In this approach, it is possible to simulate carrier evolution in high-resolution-CCD even on a common personal computer.
Artificial intelligence (AI) and its application are developed explosively not only in control field but also in signal and information processing field. Fuzzy theory is an important branch of AI. In fuzzy enhancement theory of image processing, Pal function is often employed as the membership function. Although this function possesses good filtering effect, the fuzzy factors of the function are often empirical values, which results to different image enhancement effects when the input images are different, and details of the enhancement image are not clear, then bad enhancement effect always appears. In this paper, the fuzzy factors are considered as variables. At the same time, an evaluation function is constructed to evaluate the enhancement performance, and a suitable optimization algorithm is used to obtain the most optimum values of the fuzzy factors automatically. Simulation results show good performance of the improved method.
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