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Wyświetlanie 1-15 z 52
Tytuł:
Semi-PROPELLER Compressed Sensing Image Reconstruction with Enhanced Resolution in MRI
Autorzy:
Malczewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/226988.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MRI
super-resolution
compressed sensing
Opis:
Magnetic Resonance Imaging (MRI) reconstruction algorithm using semi-PROPELLER compressed sensing is presented in this paper. It is exhibited that introduced algorithm for estimating data shifts is feasible when super- resolution is applied. The offered approach utilizes compressively sensed MRI PROPELLER sequences and improves MR images spatial resolution in circumstances when highly undersampled k-space trajectories are applied. Compressed sensing (CS) aims at signal and images reconstructing from significantly fewer measurements than were traditionally thought necessary. It is shown that the presented approach improves MR spatial resolution in cases when Compressed Sensing (CS) sequences are used. The application of CS in medical modalities has the potential for significant scan time reductions, with visible benefits for patients and health care economics. These methods emphasize on maximizing image sparsity on known sparse transform domain and minimizing fidelity. This diagnostic modality struggles with an inherently slow data acquisition process. The use of CS to MRI leads to substantial scan time reductions [7] and visible benefits for patients and economic factors. In this report the objective is to combine Super-Resolution image enhancement algorithm with both PROPELLER sequence and CS framework. The motion estimation algorithm being a part of super resolution reconstruction (SRR) estimates shifts for all blades jointly, utilizing blade-pair correlations that are both strong and more robust to noise.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 2; 211-217
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ARPNetSteg : Network Steganography Using Address Resolution Protocol
Autorzy:
Bedi, Punam
Dua, Arti
Powiązania:
https://bibliotekanauki.pl/articles/1844471.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
network steganography
ARP steganography
covert channel
Address Resolution Protocol
protocol steganography
Opis:
Steganography is a technique that allows hidden transfer of data using some media such as Image, Audio, Video, Network Protocol or a Document, without its existence getting noticed. Over the past few years, a lot of research has been done in the field of Image, Video and Audio Steganography but very little work has been done in Network Steganography. A Network Steganography technique hides data in a Network Data Unit, i.e., a Network Protocol Packet. In this paper we present an algorithm ARPNetSteg that implements Network Steganography using the Address resolution protocol. Our technique is a robust technique that can transfer 44 bits of covert data per ARP reply packet.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 4; 671-677
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emotional intelligence and conflict resolution strategies in romantic heterosexual couples
Autorzy:
Stolarski, Maciej
Postek, Sławomir
Śmieja, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/419466.pdf
Data publikacji:
2011-11-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Emotional intelligence
couples
conflict resolution
dyadic design
Opis:
This study investigated the relationships between emotional intelligence (EI) and conflict resolution strategies in romantic heterosexual couples. 164 couples solved the Test of Emotional Intelligence (TIE), a Polish measure based on the ability model of EI, and the Problem-Solving Strategies Inventory (PSSI) in two versions: self-report and a report of partner’s behavior. We assumed that individuals high in EI should have superior confl ict resolution skills and engage in active and constructive strategies, avoiding those characterized as passive and destructive. These hypotheses were supported for women, but not for men. Females’ EI was consistently positively related to self-report measures of Voice, and negatively related to self-reports of Neglect. Emotionally intelligent men did not declare use of more constructive or positive confl ict resolution styles; however, their female partners judged them as more prone to use of those strategies. The results also revealed a positive assortative mating effect with regard to EI. Additionally, the study demonstrated an interesting disparity between male and female’s reports on relationship behaviors.
Źródło:
Studia Psychologiczne (Psychological Studies); 2011, 49, 5; 65-76
0081-685X
Pojawia się w:
Studia Psychologiczne (Psychological Studies)
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Cost Design Methods to Enhance Resolution and Dimensions for Printed Electrodes
Autorzy:
Marzęcki, Michał
Tarapata, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1844461.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
technology
inkjet printing
resolution
design method
interdigital electrodes
Opis:
In the paper, we demonstrate the feasibility of interdigital electrodes fabrication with the usage of inkjet printing technology. The emphasis was put to obtain better shape quality and lower spacing between electrodes with respect to typical printing process. The paper presents an analysis of the main factors that have an influence on the dimension and quality of printed structures and proposes two methods that allow eliminating the main problems. The first proposed method is based on controlling the time between patterning of successive drops. While the second method is based on changing the design methods considering printing orientation. Both methods do not require any additional technological processes or the use of any special surface preparation methods. Finally, the obtained results and conclusions were presented and discussed.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 4; 793-799
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Conflict Resolution Strategies on Perception of Agency, Communion and Power Roles Evaluation
Autorzy:
Cisłak, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/430646.pdf
Data publikacji:
2014-12-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
agency
communion
power
social perception
conflict
conflict resolution strategies
Opis:
Two experiments probed the role of strategies used in social conflicts on perception of agency and communion. In study 1, persons who revealed prosocial orientation were perceived as less agentic, but more communal than those who revealed competitive orientation. In study 2 these findings were replicated in the context of organizational conflict, those who decided to use confrontational strategies were also perceived as more agentic, although less communal than these who used cooperative strategies. In line with the theory of power effects on objectification of social targets, the perceived agency and communion were differently linked to superior’s and subordinate’s evaluation. While perceived agency predicted the subordinate’s evaluation, perceived communion predicted superior’s evaluation, but not the other way round. Moreover, perception of communion (but not agency) mediated the negative effect of confrontational strategies on supervisor’s evaluation. On the other hand, perceived agency suppressed the effect of strategies on subordinate’s evaluation.
Źródło:
Polish Psychological Bulletin; 2014, 45, 4; 426-433
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single Image Super-Resolution through Sparse Representation via Coupled Dictionary learning
Autorzy:
Patel, Rutul
Thakar, Vishvjit
Joshi, Rutvij
Powiązania:
https://bibliotekanauki.pl/articles/226607.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
single image super-resolution
Dictionary Learning
Sparse representation
Opis:
Single Image Super-Resolution (SISR) through sparse representation has received much attention in the past decade due to significant development in sparse coding algorithms. However, recovering high-frequency textures is a major bottleneck of existing SISR algorithms. Considering this, dictionary learning approaches are to be utilized to extract high-frequency textures which improve SISR performance significantly. In this paper, we have proposed the SISR algorithm through sparse representation which involves learning of Low Resolution (LR) and High Resolution (HR) dictionaries simultaneously from the training set. The idea of training coupled dictionaries preserves correlation between HR and LR patches to enhance the Super-resolved image. To demonstrate the effectiveness of the proposed algorithm, a visual comparison is made with popular SISR algorithms and also quantified through quality metrics. The proposed algorithm outperforms compared to existing SISR algorithms qualitatively and quantitatively as shown in experimental results. Furthermore, the performance of our algorithm is remarkable for a smaller training set which involves lesser computational complexity. Therefore, the proposed approach is proven to be superior based upon visual comparisons and quality metrics and have noticeable results at reduced computational complexity.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 2; 347-353
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Efficient Edge Preserving Interpolation Method for Underwater Acoustic Image Resolution Enhancement
Autorzy:
Priyadharsini, R.
Sree Sharmila, T.
Powiązania:
https://bibliotekanauki.pl/articles/2141674.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic images
edge preserving interpolation
resolution enhancement
sonar
underwater
Opis:
Underwater acoustic images are acquired using sonar instrument that uses sound propagation to navigate and map the sea floor. The sonar devices are effectively used to create images of large area of the seabed. However, the visual perception of the object in the acoustic image depends on refraction, which is a function of changes in the speed of sound in successive layers of water. And refraction depends mainly on temperature, slightly on salinity and hydrostatic pressure. The quality and resolution of sonar imaging of the bottom depends on many other factors such as pitch, yaw and heave of the side scan sonar, the presence of volume scatterers in the water body, the distance of the sonar from the bottom and orientation of the object. Generally, the objects in an acoustic image would be of small size compared to their normal size as the distance between the sonar and object is larger. To detect and recognize the objects in the images, the resolution should be enhanced. In this paper, we propose an efficient edge preserving interpolation method for underwater acoustic image resolution enhancement which preserves the edge sharpness. The method handles the diagonal pixels in the first pass, in turn fills the horizontal and vertical pixels in the second pass. The results obtained are compared with the state-of-the-art interpolation techniques and the performance measures such as Peak Signal to Noise Ratio (PSNR) and Structural Similarity Index Measurement (SSIM) shows an improved result.
Źródło:
Archives of Acoustics; 2022, 47, 2; 267-274
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New method to analyze resolution acquisition for intraoral scanners
Autorzy:
Desoutter, Alban
Subsol, Gérard
Fargier, Eric
Sorgius, Alexandre
Tassery, Hervé
Fages, Michel
Cuisinier, Frédéric
Powiązania:
https://bibliotekanauki.pl/articles/2106418.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resolution
intra oral scanner
mesh
MicroCT
Opis:
In dentistry, 3D intraoral scanners (IOSs) are gaining increasing popularity in the production of dental prostheses. However, the quality of an IOS in terms of resolution remains the determining factor of choice for the practitioner; a high resolution is a quality parameter that can reduce error in the production chain. To the best of our knowledge, the evaluation of IOS resolution is not clearly established in the literature. This study provides a simple assessment of resolution of an IOS by measuring a reference sample and highlights various factors that may influence the resolution. A ceramic tip was prepared to create a very thin object with an edge smaller than the current resolution stated by the company. The sample was scanned with microCT (micro-computed tomography) and an IOS. The resulting meshes were compared. In the mesh obtained with the IOS, the distance between two planes on the edge was approximately 100 micrometers, and that obtained with microtomography was 25 micrometers. The curvature values were 27.46 (standard deviation - SD) 14.71) μm-1 and 5.18 (SD 1.16) μm-1 for microCT and IOS, respectively. These results show a clear loss of information for objects that are smaller than 100 μm. As there is no normalized procedure to evaluate resolution of IOSs, the method that we have developed can provide a positive parameter for control of IOSs performance by practitioners.
Źródło:
Metrology and Measurement Systems; 2022, 29, 2; 391--404
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of high timing resolution pulse synthesis based on virtual sampling
Autorzy:
Liu, Hanglin
Fu, Zaiming
Kong, Dexuan
Wang, Houjun
Xiao, Yingdong
Powiązania:
https://bibliotekanauki.pl/articles/2106417.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pulse synthesis
high resolution
virtual sampling
digital-to-analogue conversion
downsampling
Opis:
Adjustable-width pulse signals are widely used in systems such as test equipment for hold time, response time and radar testing. In this study, we proposed a pulse generation method based on virtual sampling with ultra-high pulse width resolution. In the proposed method, the sampling rate of a digital-to-analogue converter (DAC) was adjusted to considerably improve pulse width resolution. First, the sampling rate was matched with the target pulse width resolution to digitally sample the ideal signal and generate digital waveform sampling points. Next, the signal bandwidth of the DAC was matched using a low-pass digital filter. Finally, the waveform sampling points were downsampled using an integer factor and output after digital-to-analogue conversion. The waveform pulse width information generated by high-frequency digital sampling was passed step by step and retained in the final output analogue signal. A DAC with a sampling rate of 1.25 GSa/s was used, and the pulse width resolution of the pulse signal was 0.1 ns. Theoretically, a sampling rate of 10 GSa/s is required to achieve 0.1 ns resolution. This method is simple, has a low cost, and exhibits excellent performance.
Źródło:
Metrology and Measurement Systems; 2022, 29, 2; 373--389
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Super-resolution reconstruction of face images based on pre-amplification non-negative restricted neighborhood embedding
Autorzy:
Yang, X.
Liu, D.
Zhou, D.
Fei, S.
Powiązania:
https://bibliotekanauki.pl/articles/201163.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
super-resolution
neighborhood embedding
nonnegative restriction
face reconstruction
superrozdzielczość
rozpoznawanie twarzy
rekonstrukcja twarzy
Opis:
The traditional super-resolution (SR) reconstruction algorithm based on neighborhood embedding preserves the local geometric structure of image block manifold to reconstruct high-resolution (HR) manifold. However, when the magnification is large, the low resolution (LR) image is seriously degraded and most of the information is lost after down-sampling. The neighborhood relation of the LR manifold can not reflect the inherent data structure. In order to solve the problem effectively, we propose a face image SR algorithm based on pre-amplification non-negative restricted neighborhood embedding. In the training phase, the LR image is pre-amplified so that there are more similar manifold structures between the HR and LR resolution images. The constraints of the reconstructed coefficients are loosened and the HR image blocks are iteratively updated to obtain the reconstructed weights. The experimental results show that the proposed method has a better reconstruction effect compared with some traditional learning algorithms.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 6; 899-905
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation and Results of New High Resolution SAR Modes for an Airborne Maritime Patrol Radar
Autorzy:
Gromek, D.
Jarzębska, A.
Samczyński, P.
Misiurewicz, J.
Malanowski, M.
Kulpa, K.
Gromek, A.
Gadoś, A.
Smolarczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/227113.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high resolution SAR
real-time SAR imaging
ISAR
surveillance radar
Opis:
The paper presents new high resolution SAR results of real-life measurements using an updated ARS-400/ARS-800 SAR sensor installed on the maritime patrol aircraft M-28. The main role for such radars is surveying the sea surface, and the imaging of selected targets (e.g. ships, roads, vehicles, buildings, etc.) to help the operator in classifying them. In the present day increasing computing power, improved algorithms and general technological progress has allowed the obtaining of better results in SAR imagery.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 3; 213-218
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep networks for image super-resolution using hierarchical features
Autorzy:
Yang, Xin
Zhang, Yifan
Zhou, Dake
Powiązania:
https://bibliotekanauki.pl/articles/2173634.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
super-resolution
convolutional neural network
sub-pixel convolutional neural network
densely connected neural networks
super rozdzielczość
splotowa sieć neuronowa
subpikselowa splotowa sieć neuronowa
gęsto połączone sieci neuronowe
Opis:
To better extract feature maps from low-resolution (LR) images and recover high-frequency information in the high-resolution (HR) images in image super-resolution (SR), we propose in this paper a new SR algorithm based on a deep convolutional neural network (CNN). The network structure is composed of the feature extraction part and the reconstruction part. The extraction network extracts the feature maps of LR images and uses the sub-pixel convolutional neural network as the up-sampling operator. Skip connection, densely connected neural networks and feature map fusion are used to extract information from hierarchical feature maps at the end of the network, which can effectively reduce the dimension of the feature maps. In the reconstruction network, we add a 3×3 convolution layer based on the original sub-pixel convolution layer, which can allow the reconstruction network to have better nonlinear mapping ability. The experiments show that the algorithm results in a significant improvement in PSNR, SSIM, and human visual effects as compared with some state-of-the-art algorithms based on deep learning.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; art. no. e139616
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of Achieving Good GPR Image Resolution Using Focused SAR Processing
Autorzy:
Zych, M.
Powiązania:
https://bibliotekanauki.pl/articles/226575.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
GRP
LFM
multilook
mismatch shift
Opis:
The paper describes the simulation and measurement results for a ground penetrating SAR radar. The main purpose of this paper is to present the complexity of the issues relating to GPR. Permittivity of the ground determination error causes the resolution deterioration of the resulting image therefore an important task of the digital signal processing is the correct estimation of the permittivity. The article presents several methods devoted to this subject. As a simulation model of SAR system the pulse radar with LFM (Linear Frequency Modulation) signal has been applied. The aim of the experiment is to test ability of the SAR system to obtain fully focused image of the underground targets. The real data measurements took place on the 6th floor at the Faculty of Electronics and Information – Warsaw University of Technology. During measurement campaign the GPR SAR demonstrator mounted on the rails wagon has been used to generate radar motion.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 1; 49-54
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of temperature on synthetic data-based calibration models for low resolution open-path FTIR spectroscopy
Autorzy:
Cięszczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/200526.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FTIR
calibration model
temperature influence
Opis:
This article presents the problem of determining the gas concentration under conditions of changing temperatures. The solution to this problem is based on spectral measurements using chemometric models. Such problems arise when measuring gases during various industrial processes, mainly the pyrolysis process. Chemometric models are built using synthetic calibration data. Line-by-line and statistical models were applied for spectra modelling. The effect of temperature on extracting the gas concentration from spectra of various resolutions was determined. Next, the global model was built and tested using calibration data for specific temperature ranges. The properties of the linear and nonlinear partial least-squares (PLS) models that were applied to the considered issues were demonstrated. CO and CH4 were used as example gases.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 33-42
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-resolution thermal face dataset for face and expression recognition
Autorzy:
Kowalski, M.
Grudzień, A.
Powiązania:
https://bibliotekanauki.pl/articles/221388.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
face database
biometrics
thermal face recognition
infrared
face re-identification
Opis:
Development of facial recognition or expression recognition algorithms requires input data to thoroughly test the performance of algorithms in various conditions. Researchers are developing various methods to face challenges like illumination, pose and expression changes, as well as facial disguises. In this paper, we propose and establish a dataset of thermal facial images, which contains a set of neutral images in various poses as well as a set of facial images with different posed expressions collected with a thermal infrared camera. Since the properties of face in the thermal domain strongly depend on time, in order to show the impact of aging, collection of the dataset has been repeated and a corresponding set of data is provided. The paper describes the measurement methodology and database structure. We present baseline results of processing using state-of-the-art facial descriptors combined with distance metrics for thermal face re-identification. Three selected local descriptors, a histogram of oriented gradients, local binary patterns and local derivative patterns are used for elementary assessment of the database. The dataset offers a wide range of capabilities - from thermal face recognition to thermal expression recognition.
Źródło:
Metrology and Measurement Systems; 2018, 25, 2; 403-415
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 52

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