The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
IEEE 802.11g wireless LAN and IEEE 802.11n as its multiple-input multiple-output (MIMO) extension have become a de facto standard for recent indoor wireless communication technology. They adopt orthogonal frequency division multiplexing (OFDM) for its high bandwidth efficiency and robustness against multipath fading, but the OFDM signal generally bears high peak-to-average power ratio (PAPR). In IEEE...
In Bayesian multi-target filtering knowledge of parameters such as clutter intensity and sensor field-of-view are of critical importance. Significant mismatches in clutter and sensor field of view model parameters results in biased estimates. In this paper we propose a multi-target filtering solution that can accommodate non-linear target model and unknown non-homogeneous clutter intensity and sensor...
Linear filtering has been extensively studied under the assumption that the noise is Gaussian. The most commonly used least-mean-square-error (LMSE) solution is optimal when the noise is Gaussian. However, in many practical applications, the noise can be modeled more accurately using a non-Gaussian distribution. In this paper, we consider the linear filtering problem where the noise comes from a generalized...
Color image demosaicking aims to reconstruct the full-resolution RGB image from a mosaicked Color Filter Array (CFA) image. Instead of reconstructing the red, green, and blue color channels separately, most demosaicking approaches mutually recover them. However, CFA images tend to be distorted by the non-ideal response of the camera sensor, and possible motion or out-of-focus blurs during the acquisition...
In the field of image processing, it is inevitable to contain various noises in the image signals obtaining by the CCD camera. CCD noise model is a combination of a mixture of a fixed-pattern noise and multiplicative Gaussian noise and a mixture of signal-independent noise. Based on the model, this paper proposed a method to remove the noise from digital images corrupted by CCD device. The method...
Ultrasound imaging is a widely used and safe medical diagnostic technique, due to its noninvasive nature, low cost, real time imaging. However the usefulness of ultrasound imaging is degraded by the presence of signal depended noise known as speckle.. The speckle pattern depends on the structure of the image tissue and various imaging parameters. There are two main purposes for speckle reduction in...
Radiation exposure increases the risk of inducing cancer in a patient when Computed Tomography is performed. Radiologists reduce the radiation dose to minimize the risk of cancer, consequently, noise is introduced in the image, considerably penalizing its quality. To enhance the quality of the image, different noise filters are developed. The filtered noise can be discarded due to its insignificance...
Image processing is an important area in the information industry. A crucial research is how to filter noise caused by the nature, system and processing of transfers and so on. The noise mixed with the useful images or signals and brings the researchers lots of troubles. In many research areas related, such as target detecting and tracking, edge detecting and image registration, image denoising is...
This paper discusses the use of the 3-D Matched Filter to find the velocities of targets that are traveling through an image sequence. The 3-D Matched Filter is a Fast Fourier Transform-based filter that is especially effective at reducing the random noise relative to the energy of the moving target. By testing a number of velocity vectors, it is possible to determine the velocity of a target traveling...
In this paper, error passivation to filtering is considered for a general class of switched recurrent neural networks with noise disturbance. Based on Lyapunov-Krasovskii stability theory, and linear matrix inequality, a new sufficient criterion is established such that the filtering error system is globally asymptotically stable and passive from the noise disturbance to the output error, which can...
This paper describes a methodology for integrating confocal microscopy images acquired from two different illumination sources over time obtained from experiments of cell migration and vessel formation. The three-dimensional fluorescent images of stained cell nuclei and two dimensional bright field images of the extracellular matrix, supplement one another as the outline of the conduit formed by the...
In this paper we introduce a new algorithm for reconstruction of low-dose CT images. The approach, called multi-resolution feature fusion (MRFF), combines the textural qualities of conventional filtered-back projection images, with the noise suppression ability of non-quadratic regularized iterative reconstructions, to form a fast image reconstruction with good noise texture properties. Low-dose abdominal...
Many wireless sensor network datasets suffer from the effects of acquisition noise, channel noise, fading, and fusion of different nodes with huge amounts of data. At the fusion center, where decisions relevant to these data are taken, any deviation from real values could affect the decisions made. We have developed computationally low power, low bandwidth, and low cost filters that will remove the...
Fuzzy logic and fuzzy set theory can be interesting tools for engineers when solving image processing problems. They provide a mathematical model for approximate reasoning, which mimics human reasoning and therefore can be very powerfull. In this paper we review the basic concepts of fuzzy logic and fuzzy set theory, and use these tools for the construction of a filter for random impulse noise removal...
Conventional image restoration filters, such as Wiener filter, often exhibit either noise amplification or over-smoothing problem. On the other hand, advanced image restoration techniques, such as iterative regularization or combined Fourier and wavelet domain thresholding techniques, is not suitable for real-time application because of high computational overhead. For overcoming these problems, we...
Presented is a novel ECG heart beat detection algorithm combining Mathematical Morphology operations and Quadratic Spline wavelet transform for hard-wired realization. Experimentally demonstrated in FPGA under the MIT/BIH Arrhythmia database, the algorithm shows 98.16% sensitivity, 99.7% predictivity and 97.29% overall accuracy.
In this paper we evaluate a so-called “sweeping focus camera” of which the camera blur is insensitive to the actual distance to the objects and to the direction and magnitude of the velocities within a scene. This can be achieved by either moving the sensor linearly along the optical axis of the main lens or changing the focal length of the main lens while the shutter is open. A consistently sharp...
Because of wire rope conveyer belt with high load operating and complex conditions of coal mine, it is prone to cause conveyer belt horizontal rupture. It will bring tremendous hazards for coal mine safe production. Defects of wire rope and joints displacement are monitored by weak magnetic detection system. The algorithm of integration with wavelet transform and improved LMS adaptive filtering algorithm...
To solve the contradiction between the noise-reducing effect and the time complexity of the standard median filter algorithm, the paper proposed an improved median filter algorithm combined with average filtering. According to the correlation of the image, the algorithm adaptively resizes the filter mask according to noise levels of the mask. According to the sorting results of the selected pixel...
In this paper, we investigate the derivation of Cramer-Rao lower bounds on component-wise and vector filtering performance. For two state-of-the-art local (DCT) and non-local (BM3D) filters in both component-wise and vector realizations, filtering output MSEs are compared with their respectively derived CRLBs. The comparative analysis shows good correspondence for images with different content and...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.