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The selectivity of diffusion mechanism and parameters is the key in the field of image nonlinear diffusion filtering based on Perona-Malik model. The threshold estimation of the diffusion function depends mainly on the experience in the existing methods. In this paper, the relationship between the image features, the noise variance and the threshold are analyzed, and a new threshold estimation method...
How to determine the stopping mechanism and parameters is the key in the anisotropic diffusion filtering of images. This paper introduces image structures similarity (SSIM) to time scale estimation based on anisotropic diffusion. It proposes a novel estimation method of the optimal diffusion time scale by SSIM. The method correlates well with the judgment of human observers and needs not to estimate...
Donoho and Johnstone (1994) proposed a method for threshold shrink denoising based on wavelets coefficient estimation of each isolating scale get optimal results, but the correlation of contiguous coefficients is not considered. The detail of signal will be dismissed if its coefficient is similar to noisy coefficients. a novel algorithm for ground penetrating radar (GPR) image denoising based on scale...
The history of ACM Turing Award presentation, from one perspective, presents the development of computer science and technology. Moreover, the winners of ACM Turing Award enlighten us greatly. This paper performs statistics and analysis for the nationality, education background, universities, specialty and ages when they made contributions of the Turing Award winners between 1966 and 2006. From their...
Three main parts of generalized cell mapping are improved for global analysis. A simple method, which is not based on the theory of digraphs, is presented to locate complete self-cycling sets that correspond to attractors and unstable invariant sets involving saddle, unstable periodic orbit and chaotic saddle. Refinement for complete self-cycling sets is developed to locate attractors and unstable...
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