TAILIEUCHUNG - Thermodynamics Systems in Equilibrium and Non Equilibrium Part 10

Tham khảo tài liệu 'thermodynamics systems in equilibrium and non equilibrium part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 10 From Particle Mechanics to Pixel Dynamics Utilizing Stochastic Resonance Principle for Biomedical Image Enhancement . Subramanyam Rallabandi and Prasun Kumar Roy National Brain Research Centre Manesar Gurgaon India 1. Introduction There is a noteworthy analogy between the statistical mechanical systems and the digital image processing systems. We can make pixel gray levels of an image correspondence to a discrete particles under thermodynamic noise Brownian motion that transits between binary state transition from a weak- signal state to a strong-signal state whereas a noisy signal to the enhanced signal in digital imaging systems. One such phenomenon in the physical systems is stochastic resonance SR where the signal gets enhanced by adding a small amount of mean-zero Gaussian noise. A local change is made in the image based upon the current values of pixels and boundary elements in the immediate neighborhood. However this change is random and is generated by the sampling from a local conditional probability distribution. These local conditional distributions are dependent on the global control parameter called temperature in physical systems Geman Geman 1984 . At low temperature the coupling between the particles is tighter means that the images appear more regular and whereas at higher temperature induce a loose coupling between the neighboring pixels and the image appears noisy or blurred image. At particular optimum temperature these particles comes much closer fashion and similarly the pixels of an image got arranged in much closer and leads to noise degradation and further enhances the signal. In this chapter we discuss the application of the physical principle of stochastic resonance in biomedical imaging systems. Some of the applications of stochastic resonance are signal detection and signal transmission image restoration enhancement of noisy or blurred images and image segmentation. Stochastic resonance SR is a phenomenon of certain nonlinear .

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