Search results for "image"

Analysis of microtomographic images of porous heterogeneous materials

2015

In this work, we study the phases of image processing chain of microtomographic imag- ing in order to obtain reliable results while optimizing the time spent on denoising and segmentation. We consider that the decisions made at the early phases of the processing chain are most important and the selection made there essentially determine the overall quality of imaging process. We also compare here various denoising method qualita- tively, however, we think that the pure noise removal ability is not the only requirement for noise removal in microtomographic images. By proper denoising we can affect selec- tion of segmentation methods and, thus, also the quality of the analysis. Additionally, …

The Associations between Physical Activity and Body-Esteem in 15-Year-Old Adolescents : A Cross-Sectional Study from Finland

2021

Purpose: Physical activity promotes a positive physical self-image, but less is known about whether the positive effect covers the general self-evaluation of adolescent appearance. This study aimed to further explore the associations between physical activity and body-esteem in Finnish adolescents, via a country-representative cross-sectional study design. Methods: The data for the study were drawn from the Finnish component of the Health Behaviour in School-aged Children (HBSC) study (2014), using surveys from 15-year-old adolescents (n=1956, mean age 15.8 years) from 122 schools. Self-evaluations of body or appearance were measured by the Body-Esteem Scale for Adolescents and Adults (BESA…

Nuorten fyysinen minäkäsitys ja liikunnan harrastaminen

1997

Saistība starp pašcieņu, ķermeņa tēla uztveri un perfekcionismu vidusskolu izlaiduma klašu jauniešiem.

2019

Bakalaura darba mērķis ir izpētīt saistības starp pašcieņu, ķermeņa tēla uztveri un perfekcionismu vidusskolu izlaiduma klašu jauniešiem. Pētījumā tika izvirzīts jautājums: Kāda saistība pastāv starp pašcieņu, ķermeņa tēla uztveri un perfekcionismu vidusskolas izlaiduma klašu jauniešiem? Lai iegūtu atbildes uz pētījumā izvirzīto jautājumu, tika izmantotas tādas pētījuma metodes kā:  Perfekcionisma aptauja (Almost Perfect Scale- Revised Short Form; Slaney, Rice, Mobley, Trippi & Ashby, 2001). Latvijā šo metodi ir adaptējusi Renāte Buliņa, sava maģistra darba ietvaros (2009);  Rozenberga pašcieņas aptauja (Rosenberg Self-Esteem, Rosenberg, 1965). Latvijā šo metodi ir adaptējusi Anika Miltuz…

Automated Detection of Microaneurysms Using Scale-Adapted Blob Analysis and Semi-Supervised Learning

2014

International audience; Despite several attempts, automated detection of microaneurysm (MA) from digital fundus images still remains to be an open issue. This is due to the subtle nature of MAs against the surrounding tissues. In this paper, the microaneurysm detection problem is modeled as finding interest regions or blobs from an image and an automatic local-scale selection technique is presented. Several scale-adapted region descriptors are then introduced to characterize these blob regions. A semi-supervised based learning approach, which requires few manually annotated learning examples, is also proposed to train a classifier to detect true MAs. The developed system is built using only…

The Relationship between Auditory Imagery and Musical Synchronization Abilities in Musicians

2009

Musical ensemble performance requires precise action coordination. To maintain synchrony in the presence of expressive tempo variations, musicians presumably anticipate the sounds that will be produced by their co-performers and coordinate their own anticipated actions with these predictions. Anticipatory auditory images in pitch and time may facilitate such predictions. Two experiments were conducted to examine the contribution of different aspects of auditory imagery abilities to sensorimotor synchronization (SMS) in musicians. In Experiment 1, the acuity of single-tone pitch images was measured by an adjustment method and by adaptive threshold estimation. Different types of finger tappin…

Obraz v "Zapiskah ohotnika" Ivana Turgeneva i "Zerkale morej" Džozefa Konrada

2015

Predicted gamma-ray image of SN 1006 due to inverse Compton emission

2009

We propose a method to synthesize the inverse Compton (IC) gamma-ray image of a supernova remnant starting from the radio (or hard X-ray) map and using results of the spatially resolved X-ray spectral analysis. The method is successfully applied to SN 1006. We found that synthesized IC gamma-ray images of SN 1006 show morphology in nice agreement with that reported by the H.E.S.S. collaboration. The good correlation found between the observed very-high energy gamma-ray and X-ray/radio appearance can be considered as an evidence that the gamma-ray emission of SN 1006 observed by H.E.S.S. is leptonic in origin, though the hadronic origin may not be excluded.

Emulation of Sun-Induced Fluorescence from Radiance Data Recorded by the HyPlant Airborne Imaging Spectrometer

2021

The retrieval of sun-induced fluorescence (SIF) from hyperspectral radiance data grew to maturity with research activities around the FLuorescence EXplorer satellite mission FLEX, yet full-spectrum estimation methods such as the spectral fitting method (SFM) are computationally expensive. To bypass this computational load, this work aims to approximate the SFM-based SIF retrieval by means of statistical learning, i.e., emulation. While emulators emerged as fast surrogate models of simulators, the accuracy-speedup trade-offs are still to be analyzed when the emulation concept is applied to experimental data. We evaluated the possibility of approximating the SFM-like SIF output directly based…

Image inpainting using directional wavelet packets originating from polynomial splines

2020

The paper presents a new algorithm for the image inpainting problem. The algorithm is using a recently designed versatile library of quasi-analytic complex-valued wavelet packets (qWPs) which originate from polynomial splines of arbitrary orders. Tensor products of 1D qWPs provide a diversity of 2D qWPs oriented in multiple directions. For example, a set of the fourth-level qWPs comprises 62 different directions. The properties of the presented qWPs such as refined frequency resolution, directionality of waveforms with unlimited number of orientations, (anti-)symmetry of waveforms and windowed oscillating structure of waveforms with a variety of frequencies, make them efficient in image pro…