A5015294353- Computer Graphics and Visualization Techniques
- 3D Shape Modeling and Analysis
- Advanced Vision and Imaging
- Color Science and Applications
- Medical Image Segmentation Techniques
- Optical measurement and interference techniques
- Geological Formations and Processes Exploration
- Surface Roughness and Optical Measurements
- Hydrocarbon exploration and reservoir analysis
- Visual perception and processing mechanisms
- Aesthetic Perception and Analysis
- Color perception and design
- Geological and Geochemical Analysis
- Image Retrieval and Classification Techniques
- Paleontology and Stratigraphy of Fossils
- Generative Adversarial Networks and Image Synthesis
- Image and Video Quality Assessment
- Geological formations and processes
- Industrial Vision Systems and Defect Detection
- Image Processing and 3D Reconstruction
- Machine Learning and Data Classification
- Image Enhancement Techniques
- Material Properties and Processing
- Data Visualization and Analytics
- Visual Attention and Saliency Detection
Czech Academy of Sciences, Institute of Information Theory and Automation
2015-2024
Czech Academy of Sciences, Institute of Psychology
2023
Justus-Liebig-Universität Gießen
2023
Czech Academy of Sciences
2009-2022
Czech Academy of Sciences, Institute of Geology
2002-2022
Charles University
2019
Czech Academy of Sciences, Institute of Rock Structure and Mechanics
2019
Prague University of Economics and Business
2018
Heriot-Watt University
2008
An ever-growing number of real-world computer vision applications require classification, segmentation, retrieval, or realistic rendering genuine materials. However, the appearance real materials dramatically changes with illumination and viewing variations. Thus, only reliable representation material visual properties requires capturing its reflectance in as wide range light camera position combinations possible. This is a principle recent most advanced texture representation, Bidirectional...
Abstract BRDFs are commonly used to represent given materials’ appearance in computer graphics and related fields. Although, the recent past, have been extensively measured, compressed, fitted by a variety of analytical models, most research has primarily focused on simplified isotropic BRDFs. In this paper, we present unique database 150 representing wide range materials; majority exhibiting anisotropic behavior. Since time‐consuming BRDF measurement represents major obstacle digital...
Abstract A limestone cave filled with montmorillonite clay was found in a hill above the karst plateau on north‐eastern edge of Adriatic Sea. The fill shows no correlation sediments surrounding caves or other known Classical Karst, where content is negligible. In caves, primary deposited originate from weathered Eocene flysch and were transported into by sinking streams. Powder X‐ray diffraction analyses indicate pure composition few coarser quartz grains heavy minerals. Based these results...
Surface reflectance of real-world materials is now widely represented by the bidirectional distribution function (BRDF) and also spatially varying representations such as SVBRDF texture (BTF). The raw surface measurements are typically compressed or fitted analytical models, that always introduce a certain loss accuracy. For its evaluation we need distance between reference approximate version. Although some past techniques tried to reflect perceptual sensitivity human vision, they have...
In this paper we introduce unique publicly available dense an isotropic BRDF data measurements. We use as a reference for performance evaluation of the proposed sparse angular sampling and interpolation approach. The method is based on subspaces at fixed elevations by means several adaptively-represented, uniformly distributed, perpendicular slices. Although requires only material, provides very accurate reconstruction, visually computationally comparable to densely measured reference. Due...
The recent advanced representation for realistic real-world materials in virtual reality applications is the Bidirectional Texture Function (BTF) which describes rough texture appearance varying illumination and viewing conditions. Such a function can be represented by thousands of measurements (images) per material sample. resulting BTF size excludes its direct rendering graphical some compression these huge data spaces obviously inevitable. In this paper we present novel, fast...
Bidirectional Texture Functions (BTF) are commonly thought to provide the most realistic perceptual experience of materials from rendered images. The key providing efficient compression BTFs is decision as how much data should be preserved. We use psychophysical experiments show that this depends critically upon material concerned. Furthermore, we develop a BTF derived metric enables us automatically set material's parameters in such way users with predefined quality. investigate correlation...
Abstract The Bidirectional Texture Function (BTF) is becoming widely used for accurate representation of real‐world material appearance. In this paper a novel BTF compression model proposed. resamples input data into parametrization, allowing decomposition individual view and illumination dependent texels set multi‐dimensional conditional probability density functions. These functions are compressed in turn using multi‐level vector quantization algorithm. result algorithm index scale...
A photo-realistic representation of material appearance can be achieved by means bidirectional texture function (BTF) capturing a material’s for varying illumination, viewing directions, and spatial pixel coordinates. BTF captures many non-local effects in structure such as inter-reflections, occlusions, shadowing, or scattering. The acquisition data is usually time resource-intensive due to the high dimensionality data. This results expensive, complex measurement setups and/or excessively...
The development of novel analytical BRDF models, as well adaptive sampling approaches, rely on the appropriate measurement real materials. quality measurements is even more critical when it comes to accurately representing anisotropic materials where character anisotropy unknown (locations highlights, their width, shape, etc.). As currently there a lack dense yet noise-free datasets, we introduce such unique three fabric In this paper discuss method data acquisition, post processing, missing...
Abstract Metamorphic grade, palaeothermal history and the influence of tectonic strain on clay minerals organic matter transformation were studied in eastern part Teplá-Barrandian unit Czech Republic. The metamorphic grade pelitic sediments ranges from lower anchizone (IC ~0.30–0.36Δº2θ) to lowermost epizone ~0.24–0.26Δº2θ). Increase is paralleled by development anastomosing cleavage lenticular quartz grains which give way slaty dynamically recrystallized ribbon epizone. White mica highly...
Abstract BRDFs are commonly used for material appearance representation in applications ranging from gaming and the movie industry, to product design specification. Most rely on isotropic due their better availability as a result of easier acquisition process. On other hand, anisotropic BRDF structure‐dependent highlights, more challenging measure This paper thus leverages measurement process by representing such collection BRDFs. Our method relies an database decomposition into training...
The bidirectional texture function (BTF) describes appearance variations due to varying illumination and viewing conditions. This is acquired by large number of measurements for all possible combinations positions hence some compressed representation these huge BTF data spaces obviously inevitable. In this paper, we present a novel efficient probabilistic model-based method multispectral compression which simultaneously allows its modelling. model capable seamless space enlargement direct...
Abstract Zircon and apatite fission track (AFT) thermochronology was applied to the James Ross Basin sedimentary rocks from Seymour islands. The probable sources of these sediments were generated in Carboniferous Early Paleogene times (∼315 60 Ma). total depths individual formations are discussed. AFT data modelled, thermal history model reconstructed for samples Island. first stage after a period annealing (when above 120°C) involved Late Triassic cooling (∼230 200 Ma) is followed by steady...
Multidimensional visual texture is the appropriate paradigm for physically correct material properties representation. The course will present recent advances in modelling methodology as applied computer vision, pattern recognition, graphics, and virtual/augmented reality applications. Contrary to previous courses on appearance, we focus materials whose nature allows exploitation of modeling approaches. This topic introduced wider complete context recognition image processing. It comprehends...