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[IEEE 2018 International Conference on Communication and Signal Processing (ICCSP) - Chennai (2018.4.3-2018.4.5)] 2018 International Conference on Communication and Signal Processing (ICCSP) - Spatially Localized Implementation of SSR and DSR for Image Denoising
摘要： This paper presents an algorithm for noise removal from digital image, based on stochastic noise pattern. We propose spatially localized stochastic resonance for image denoising implemented using Suprathreshold Stochastic Resonance (SSR) and Dynamic Stochastic Resonance (DSR). The approach has been tested on 300 images. For SSR implementation, input noisy image is subjected to independent additive white Gaussian noise of different standard deviation, the output image corresponding to individual noise standard deviation, summed and averaged, to get the denoised image. For DSR implementation, singular values are used for noise suppression in digital images. Key issue of our work is the reconstruction of the input noisy image by stochastic noise pattern using SSR and DSR that reflect better features of the image. The results of these are quantified appropriately through PSNR (peak signal-to-noise ratio) and visualization of an output image. The localized implementation was tested on a dataset of 300 images and when compared with the conventional techniques, our approach is found to give marginally better noise reduction in most of the cases. The average PSNR improvement is considerably improved.
关键词： Image denoising,stochastic resonance,spatial localization
更新于2025-09-23 15:22:29
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Interference effect in optomechanical stochastic resonance
摘要： In this paper, we study the stochastic resonance (SR) effect in an optomechanical system driven by a strong coupling field and two weak signals in both semiclassical and quantum frameworks. In the semiclassical description, the SR phenomena are found at the cooperation of input signals and system noises. When two signals coact on our system, the interference effect between the optically induced SR and the mechanically induced SR can be generated. In particular, a unique beating effect, which makes the SR effect robust against the initial phase difference of two signals, appears in the SR synchronization process with unsynchronized signals. In addition, the quantum stochastic resonance effect is numerically observed in the full quantum framework induced by pure quantum fluctuations.
关键词： beating effect,quantum framework,semiclassical framework,interference effect,stochastic resonance,optomechanical system
更新于2025-09-23 15:21:01
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Velocity controlled pattern writing: An application of stochastic resonance
摘要： In the present work, the concept of stochastic resonance is employed for pattern fabrication. In particular, the interplay of noise amplitudes and intrinsic system time scales is investigated. This interplay enabled us to obtain preordained patterns. Experiments were performed galvanostatically in a two electrode electrochemical cell onto a n-type Si substrate using a coherent wavelength laser source of 5 mW intensity. A focused laser beam was swept along the silicon substrate unidirectionally by moving the electrochemical cell at different velocities. By systematic tuning of the velocity, we have observed a unimodal variation in the contrast of the pattern. This indicates the occurrence of the stochastic resonance phenomena. Corresponding numerical simulations, performed on a spatial array of diffusively coupled FitzHugh-Nagumo oscillators in the presence of external noise, reveal good agreement with the experimental observations.
关键词： FitzHugh-Nagumo oscillators,pattern fabrication,electrochemical cell,stochastic resonance
更新于2025-09-12 10:27:22
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Dynamical stochastic resonance for non-uniform illumination image enhancement
摘要： Images taken under poor illumination conditions have low contrast and dark tones. General dark image enhancement algorithms cannot effectively enhance these images without introducing over-enhancement, detail loss, and noise amplification. In this study, a simple and fast enhancement technique of non-uniform illumination images is proposed based on dynamical stochastic resonance (DSR). The low-contrast images are enhanced through the nonlinear iteration by solving monostable Langevin equation. Iteration parameters are dynamically adjusted according to the intensity distribution of the original images, which ensure the balance of visibility and naturalness in the entire areas. A threshold is defined to automatically confirm the optimal outputs. The enhanced image is obtained by fusing the DSR result, original component, and illumination compensation component. The computational time, no-reference perceptual quality assessment, and lightness order error are measured to evaluate the performance of experimental results. The subjective and objective comparison with state-of-the-art methods shows that our method performs well to enhance the non-uniform illumination images with a low-computational complexity.
关键词： non-uniform illumination,Langevin equation,nonlinear iteration,image enhancement,dynamical stochastic resonance
更新于2025-09-10 09:29:36
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Stochastic Resonance in Bioinspired Electronic Device Using Polymer Field Effect Transistors
摘要： Stochastic resonance (SR) phenomenon is emerged in organic field effect transistors (OFETs) using π-conjugated polymer, where application of external noise to the OFET system enhances signal/information processing performance which is often found in biological systems. The channel conductivity of the OFET is slightly increased by spin-coating using heated semiconductor polymer solution with heated glass substrate. In order to improve frequency responses of OFET, optimal width of the gate electrode is explored. Furthermore, it turns out that scratching and removing semiconductor film outside the source-drain electrodes and the channel enhances the On-Off current ratio of the device. These fabrication processes lead to steeper nonlinearity on the IDS vs. VGS curve, resulting in emergence of SR, which is fingerprinted in increase of correlation value between input and output signals with increase of intensity of external noise.
关键词： Stochastic resonance,Polymer thin films,Organic semiconductors,Bioinspiration,Field effect transistors
更新于2025-09-09 09:28:46