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.
Bidirectional high data rate satellite links are needed in emergency conditions where other telecommunication infrastructures are not available. This paper focuses the design of Co-radiator transmit receive antenna suitable for satellite Ku-band emergency communications. The reported antenna consists of two elements in the same patch which is operated from 10.7 GHz to 12.5 GHz for reception and 14...
Recently low-rank matrix decomposition (LR) and sparse representation classification (SRC) have been successfully applied to address the problem of face recognition. Low-rank matrix decomposition is employed as the first step of robust principal component analysis (RPCA), it is robust to illumination-contaminated image data. In this paper, we propose a novel method based on low-rank decomposition...
In the paper a spectroscopic multi-wavelength non-invasive measurement of substances levels in human body is analyzed. It is assumed that measurements can be done in any part of body. Three different techniques are compared: one using single wavelength of light, and two multi-wavelength ones: using two wavelength with and without additional data for white light. Concentration levels of two compounds...
Video walls are useful to display large visualizations. The SAGE2 web-based system allows easy programming of scalable visualization applications. However, it is not easy to stream high resolution video to SAGE2 powered video walls. We proposed several methods of high resolution video streaming to LCD walls, evaluated their performance and discuss their scalability and properties.
This paper shows a review investigation the possibility of increasing the efficiency of existing line test solutions for troubleshooting IPTV over xDSL, by the results of experimental research on real system under commercial exploitation. At the beginning of this paper the main weaknesses of the existing troubleshooting testing are described. In the rest of the paper the parameters of the physical...
The possibility to monitor the cardio-respiratory activity in a non-invasive way, by measuring thoracic displacement using cost-effective microwave Doppler technology, has been studied. Several laboratory tests were performed in order to demonstrate the feasibility of the proposed electromagnetic measurement method. Time domain signal processing techniques have been used in order to evaluate the main...
The article proposes the use of a downsampling process, and a parametric spectral estimation method to determine the velocity of the liquid in the pipe. The estimation is based on measuring the Doppler shift amount derived by the reflection of the transmitted sine wave by moving air bubbles in the liquid. The simulation results for plastic and steel pipes show that it is possible to accurately measure...
This paper presents a categorization of Synthetic Aperture Radar (SAR) data patches. The categories of the SAR data were designed manually by cutting several spotlight SAR products into different categories. The supervised approach to the categorization was proposed, where an oriented dual tree wavelet transform was used to decompose energy of the original image. Subbands of wavelet transforms with...
This paper presents the temporal enhancement of the graph-based depth estimation method, designed for multiview systems with arbitrarily located cameras. The primary goal of the proposed enhancement is to increase the quality of estimated depth maps and simultaneously decrease the time of estimation. The method consists of two stages: the temporal enhancement of segmentation required in used depth...
A computationally efficient feature, called Minimum Energy Density (MED) was applied to discriminate audio signals between speech and music in the radio stations programs. The presented binary classifier is based on testing two features: energy distribution and differences between energy in channels. We analyzed 240 hours of signals, from 10 Polish radio stations. Our analysis enables us to provide...
In the paper we present a method for increasing the quality of views synthesized with typical Depth-Image-Based Rendering (DIBR) view synthesis algorithms. In the proposed idea the resolution of input real views and corresponding depth maps is doubled before the view synthesis. After the synthesis, the resolution of a synthesized view is downsampled back to the original resolution. This approach is...
Super-resolution reconstruction algorithms have been extensively studied for the last years. However, despite the progress made in this field, many issues remain to be solved. Some of them are basically omitted and their importance is trivialized. Routinely, for instance, researchers are willing to make the relative motion model simpler than it should be considered. The commonly applied non-rigid...
The vibroacoustic method of device diagnostics is most often based on spectrum analysis of digitally recorded vibration signal of their mechanical elements. In the steady-state, depending on the test object, the signal may contain only fundamental frequency and harmonics. Then, in case of poor mechanical condition, diagnostic signal contains also some foreign frequencies. Using signal of finite length...
In active learning for Automatic Speech Recognition (ASR), a portion of data is automatically selected for manual transcription. The objective is to improve ASR performance with retrained acoustic models. The standard approaches are based on confidence of individual sentences. In this study, we look into an alternative view on transcript label quality, in which Gaussian Supervector Distance (GSD)...
Recent studies have indicated that well-designed convolutional neural network (CNN) has achieved comparable performance to the spatial rich models with ensemble classifier (SRM-EC) in digital image steganalysis. In this paper, we discuss the difference and correlation between a CNN model and a SRM-EC model, and explore the classification error rate varying with texture complexity of an image for both...
This paper introduces a new information display system that can prevent the on-screen contents from being taken by cameras or camcorders without sacrificing visual qualities. The system is designed based on the idea of temporal psychovisual modulation (TPVM) with guidance from the concept of ‘window of visibility (WoV)’. TPVM utilizes the redundancy (in terms of spatiotemporal resolutions and etc...
IPsec is a suite of protocols that adds security to communications at the IP level. However, the high computing power required by the IPsec algorithms limits network connection performance. The paper presents the hardware implementation of IPsec gateway in FPGA. Efficiency of the proposed solution allows to use it in networks with data rates of several Gbit/s.
The paper presents application of the emerging HEVC Screen Content Coding for frame-compatible compression of stereoscopic video. Such a solution may be an alternative to the Multiview HEVC, which is the state-of-the-art dedicated technique for multiview video compression. The paper provides an extensive description of main differences between both compression techniques. Authors also present adaptation...
This article presents our recent study on multi colored text binarization. In the output image, we represented foreground content as black and background as white regardless the polarity of foreground and background in original image. Here we applied connected component analysis based approach to group the words or characters within bounding or edge box. The main novelty of this reported work includes...
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.