Search results for: Jan Čech

Items from 1 to 20 out of 26 results

chapter

Learning CNNs for Face Recognition from Weakly Annotated Images

Vojtech Franc, Jan Cech

2017 12th IEEE International Conference on Automatic Face & Gesture Recognition (FG 2017) > 933 - 940

2017 12th IEEE International Conference on Automatic Face & Gesture Recognition (FG 2017)

Supervised learning of convolutional neural networks (CNNs) for face recognition requires a large set of facial images each annotated with a single attribute label to be predicted. In this paper we propose a method for learning CNNs from weakly annotated images. The weak annotation in our setting means that a pair of an attribute label and a person identity label is assigned to a set of faces automatically...

article

Mass spectrometry of diffuse coplanar surface barrier discharge: influence of discharge frequency and oxygen content in N₂/O₂ mixture*

Jan Čech, Antonín Brablec, Mirko Černák, Nevena Puač, more

The European Physical Journal D > 2017 > 71 > 2 > 1-8

Diffuse Coplanar Surface Barrier Discharge (DCSBD) has been studied extensively for industrial applications in recent decade. So far, limited information was available on the production of ozone or nitrogen oxides important for industrial deployment of DCSBD. In this paper results of mass spectrometry of DCSBD performed at atmospheric pressure are presented. DCSBD mass spectra were studied for different...

article

Atmospheric pressure plasma etching of silicon dioxide using diffuse coplanar surface barrier discharge generated in pure hydrogen

Richard Krumpolec, Jan Čech, Jana Jurmanová, Pavol Ďurina, more

Surface and Coatings Technology > 2017 > 309 > C > 301-308

We report on the method of dry etching of silicon dioxide (SiO₂) layers by cold plasma treatment at atmospheric pressure in pure hydrogen using Diffuse Coplanar Surface Barrier Discharge (DCSBD). The SiO₂ etching rate was estimated at ~1nm/min. The studied plasma process was found to be the composition of plasma induced reduction and etching. The changes in surface morphology of etched samples were...

article

Plasma treatment of detonation and HPHT nanodiamonds in diffuse coplanar surface barrier discharge in H₂/N₂ flow

Vít Jirásek, Jan Čech, Halyna Kozak, Anna Artemenko, more

physica status solidi (a) > 213 > 10 > 2680 - 2686

Due to extraordinary properties and biocompatibility, diamond nanoparticles – nanodiamonds (NDs) are considered for various biomedical applications. Amongst other functional groups which may be grafted on the NDs surface, the amines (NH_x) are highly demanded linkers for biomolecules and dyes. In this regard, a non‐destructive, non‐hazardous and low‐cost method of NDs amination would further accelerate...

article

On spatial stabilization of dielectric barrier discharge microfilaments by residual heat build-up in air

Jozef Ráhel, Zsolt Szalay, Jan Čech, Tomás Morávek

The European Physical Journal D > 2016 > 70 > 4 > 1-7

Microfilaments of dielectric barrier discharge are known for their multiple re-appearance at the same spot on dielectrics. This effect of localized re-appearance is driven by residual excited species and ions, surface charge deposited on the dielectric and the local temperature build-up resulting in the local increase of reduced electric field E/ΔN. To assess the magnitude of the latter, the breakdown...

chapter

Dense Stereomatching Algorithm Performance for View Prediction and Structure Reconstruction

Jana Kostková, Jan Čech, Radim Šára

Lecture Notes in Computer Science > Image Analysis > Depth and Surface I > 101-107

The knowledge of stereo matching algorithm properties and behaviour under varying conditions is crucial for the selection of a proper method for the desired application. In this paper we study the behaviour of four representative matching algorithms under varying signal-to-noise ratio in six types of error statistics. The errors are focused on basic matching failure mechanisms and their definition...

chapter

Complex Correlation Statistic for Dense Stereoscopic Matching

Jan Čech, Radim Šára

Lecture Notes in Computer Science > Image Analysis > Poster Presentations 1: Image Analysis, Computer Vision, Machine Vision, and Applications > 598-608

A traditional solution of area-based stereo uses some kind of windowed pixel intensity correlation. This approach suffers from discretization artifacts which corrupt the correlation value. We introduce a new correlation statistic, which is completely invariant to image sampling, moreover it naturally provides a position of the correlation maximum between pixels. Hereby we can obtain sub-pixel disparity...

article

Multi-view facial landmark detection by using a 3D shape model

Jan Čech, Vojtěch Franc, Michal Uřičář, Jiří Matas

Image and Vision Computing > 2016 > 47 > C > 60-70

An algorithm for accurate localization of facial landmarks coupled with a head pose estimation from a single monocular image is proposed. The algorithm is formulated as an optimization problem where the sum of individual landmark scoring functions is maximized with respect to the camera pose by fitting a parametric 3D shape model. The landmark scoring functions are trained by a structured output SVM...

article

Low‐Temperature hydrogenation of diamond nanoparticles using diffuse coplanar surface barrier discharge at atmospheric pressure

Alexander Kromka, Jan Čech, Halyna Kozak, Anna Artemenko, more

physica status solidi (b) > 252 > 11 > 2602 - 2607

Due to an extraordinary combination of intrinsic properties of diamond nanoparticles (DNPs), there is an increased demand for their usage in various areas. While a broad range of surface termination is often done by wet‐chemical, UV‐irradiation or plasma treatments, DNPs hydrogenation is still an open issue. Thermal annealing or microwave plasma treatment, both known as high‐temperature processes,...

article

Diffuse Coplanar Surface Barrier Discharge in Artificial Air: Statistical Behaviour of Microdischarges

Jan Čech, Jana Hanusová, Pavel Sťahel, Mirko Černák

Open Chemistry > 2015 > 13 > 1

Diffuse Coplanar Surface Barrier Discharge (DCSBD) is a novel type of atmospheric-pressure plasma source developed for high-speed large-area surface plasma treatments. The statistical behavior of microdischarges of DCSBD generated in artificial air atmosphere was studied using time-correlated optical and electrical measurements. Changes in behavior of microdischarges are shown for various electrode...

article

Erratum to: Continuous Action Recognition Based on Sequence Alignment

Kaustubh Kulkarni, Georgios Evangelidis, Jan Cech, Radu Horaud

International Journal of Computer Vision > 2015 > 112 > 1 > 130-130

article

Continuous Action Recognition Based on Sequence Alignment

Kaustubh Kulkarni, Georgios Evangelidis, Jan Cech, Radu Horaud

International Journal of Computer Vision > 2015 > 112 > 1 > 90-114

Continuous action recognition is more challenging than isolated recognition because classification and segmentation must be simultaneously carried out. We build on the well known dynamic time warping framework and devise a novel visual alignment technique, namely dynamic frame warping (DFW), which performs isolated recognition based on per-frame representation of videos, and on...

chapter

A 3D Approach to Facial Landmarks: Detection, Refinement, and Tracking

Jan Cech, Vojtech Franc, Jiri Matas

2014 22nd International Conference on Pattern Recognition > 2173 - 2178

2014 22nd International Conference on Pattern Recognition (ICPR)

A real-time algorithm for accurate localization of facial landmarks in a single monocular image is proposed. The algorithm is formulated as an optimization problem, in which the sum of responses of local classifiers is maximized with respect to the camera pose by fitting a generic (not a person-specific) 3D model. The algorithm simultaneously estimates a head position and orientation and detects the...

article

Diffuse Coplanar Surface Barrier Discharge in Artificial Air: Statistical Behaviour of Microdischarges

Jan Čech, Jana Hanusová, Pavel Sťahel, Mirko Černák

Open Chemistry > 2015 > 13 > 1

chapter

Active-speaker detection and localization with microphones and cameras embedded into a robotic head

Jan Cech, Ravi Mittal, Antoine Deleforge, Jordi Sanchez-Riera, more

2013 13th IEEE-RAS International Conference on Humanoid Robots (Humanoids) > 203 - 210

2013 13th IEEE-RAS International Conference on Humanoid Robots (Humanoids 2013)

In this paper we present a method for detecting and localizing an active speaker, i.e., a speaker that emits a sound, through the fusion between visual reconstruction with a stereoscopic camera pair and sound-source localization with several microphones. Both the cameras and the microphones are embedded into the head of a humanoid robot. The proposed statistical fusion model associates 3D faces of...

article

The study of rutile pigments Ti1−3x CrxM2x O2

Jan Večeřa, Jan Čech, Petr Mikulášek, Petra Šulcová

Open Chemistry > 2013 > 11 > 9 > 1447-1455

Abstract This study deals with rutile pigments of type Ti1−3x Crx M2x O2 (where M = Sb, W and x = 0, 0.05, 0.10, 0.20, 0.30, 0.50) prepared by solid state reaction. Chromium is the chromophore (coloring ion); antimony and tungsten are added for achieving electroneutrality. The effect of doping elements (M = Sb, W), calcination temperature (850, 950, 1050, 1150°C) and composition (x = 0, 0.05, 0.10,...

article

The study of rutile pigments Ti1−3x CrxM2x O2

Jan Večeřa, Jan Čech, Petr Mikulášek, Petra Šulcová

Open Chemistry > 2013 > 11 > 9 > 1447-1455

article

The study of rutile pigments Ti_1−3xCr_xM_2xO₂

Jan Večeřa, Jan Čech, Petr Mikulášek, Petra Šulcová

Central European Journal of Chemistry > 2013 > 11 > 9 > 1447-1455

This study deals with rutile pigments of type Ti_1−3xCr_xM_2xO₂ (where M = Sb, W and x = 0, 0.05, 0.10, 0.20, 0.30, 0.50) prepared by solid state reaction. Chromium is the chromophore (coloring ion); antimony and tungsten are added for achieving electroneutrality. The effect of doping elements (M = Sb, W), calcination temperature (850, 950, 1050, 1150°C) and composition (x = 0, 0.05, 0.10, 0.20,...

article

RAVEL: an annotated corpus for training robots with audiovisual abilities

Xavier Alameda-Pineda, Jordi Sanchez-Riera, Johannes Wienke, Vojtěch Franc, more

Journal on Multimodal User Interfaces > 2013 > 7 > 1-2 > 79-91

We introduce Ravel (Robots with Audiovisual Abilities), a publicly available data set which covers examples of Human Robot Interaction (HRI) scenarios. These scenarios are recorded using the audio-visual robot head POPEYE, equipped with two cameras and four microphones, two of which being plugged into the ears of a dummy head. All the recordings were performed in a standard room with no special equipment,...

chapter

Online multimodal speaker detection for humanoid robots

Jordi Sanchez-Riera, Xavier Alameda-Pineda, Johannes Wienke, Antoine Deleforge, more

2012 12th IEEE-RAS International Conference on Humanoid Robots (Humanoids 2012) > 126 - 133

2012 12th IEEE-RAS International Conference on Humanoid Robots (Humanoids 2012)

In this paper we address the problem of audio-visual speaker detection. We introduce an online system working on the humanoid robot NAO. The scene is perceived with two cameras and two microphones. A multimodal Gaussian mixture model (mGMM) fuses the information extracted from the auditory and visual sensors and detects the most probable audio-visual object, e.g., a person emitting a sound, in the...

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INFONA - science communication portal

Search results for: Jan Čech

Learning CNNs for Face Recognition from Weakly Annotated Images

Mass spectrometry of diffuse coplanar surface barrier discharge: influence of discharge frequency and oxygen content in N₂/O₂ mixture*

Atmospheric pressure plasma etching of silicon dioxide using diffuse coplanar surface barrier discharge generated in pure hydrogen

Plasma treatment of detonation and HPHT nanodiamonds in diffuse coplanar surface barrier discharge in H₂/N₂ flow

On spatial stabilization of dielectric barrier discharge microfilaments by residual heat build-up in air

Dense Stereomatching Algorithm Performance for View Prediction and Structure Reconstruction

Complex Correlation Statistic for Dense Stereoscopic Matching

Multi-view facial landmark detection by using a 3D shape model

Low‐Temperature hydrogenation of diamond nanoparticles using diffuse coplanar surface barrier discharge at atmospheric pressure

Diffuse Coplanar Surface Barrier Discharge in Artificial Air: Statistical Behaviour of Microdischarges

Erratum to: Continuous Action Recognition Based on Sequence Alignment

Continuous Action Recognition Based on Sequence Alignment

A 3D Approach to Facial Landmarks: Detection, Refinement, and Tracking

Diffuse Coplanar Surface Barrier Discharge in Artificial Air: Statistical Behaviour of Microdischarges

Active-speaker detection and localization with microphones and cameras embedded into a robotic head

The study of rutile pigments Ti1−3x CrxM2x O2

The study of rutile pigments Ti1−3x CrxM2x O2

The study of rutile pigments Ti_1−3xCr_xM_2xO₂

RAVEL: an annotated corpus for training robots with audiovisual abilities

Online multimodal speaker detection for humanoid robots

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