David Sedláček | Czech Technical University in Prague (original) (raw)
Papers by David Sedláček
IEEE Access, Dec 31, 2023
Muzeum Muzejní a vlastivedná práce, 2022
One of the challenges that museums often face is how to present their ‚treasures‘ in a form that ... more One of the challenges that museums often face is how to present their ‚treasures‘ in a form that is both comprehensive and relevant to today‘s audiences. Digital content alone is not enough in this context and 3D content is increasingly gaining importance. One of the most accessible and at the same time most effective 3D digitisation methods is photogrammetry. The result, if procedures are followed correctly, is not only high-quality content with a wide range of uses, but also potential stepping stones for effective business models. This can reduce acquisition costs quite significantly and make 3D digitisation accessible to a wider range of institutions.
International Journal of Heritage in the Digital Era, 2013
A large data set of input RAW photos for 3D reconstruction of historical paper model of Prague is... more A large data set of input RAW photos for 3D reconstruction of historical paper model of Prague is presented in this paper. The data acquisition process and its organisation are described in detail together with color and camera calibration algorithms used. Moreover, a complete reconstruction work-flow together with several cultural heritage applications are briefly presented. The subject of this 3D reconstruction has been the Langweil model of Prague, originally created in the first half of 19 th century. Three parts of this model with different characteristics are afforded for computer scientists through the internet.
The challenges for current state-of-the-art 3D reconstruction algorithms covered in the Langweil ... more The challenges for current state-of-the-art 3D reconstruction algorithms covered in the Langweil model of Prague data set are summarized in this poster. The model properties are presented together with problems which bring.
In this paper, we introduce a lightweight and robust tracking technique based on color balls. The... more In this paper, we introduce a lightweight and robust tracking technique based on color balls. The algorithm builds on a variant of randomized Hough transform and is optimized for a use in real-time applications like on low-cost Augmented Reality (AR) systems. With just one conventional color camera our approach provides the ability to determine the 3D position of several color balls at interactive frame rates on a common PC workstation. It is fast enough to be easily combined with another real-time tracking engine. In contrast to popular tracking techniques based on recognition of planar fiducial markers it offers robustness to partial occlusion, which eases handling and manipulation. Furthermore, while using balls as markers a proper haptic feedback and visual metaphor is provided. The exemplary use of our technique in the context of two AR applications indicates the effectiveness of the proposed approach.
2016 IEEE 14th International Conference on Industrial Informatics (INDIN), 2016
The role of human in the Industrie 4.0 vision is still considered as irreplaceable. Therefore, us... more The role of human in the Industrie 4.0 vision is still considered as irreplaceable. Therefore, user interfaces of cyberphysical systems involved in the production automation need to be well designed and taking into consideration the industrial application requirements. With the advances in augmented and virtual reality data visualization and novel interaction techniques like mid-air gestures, these approaches seem to be suitable for integration into the industry environment. This paper describes the implementation of an augmented reality application for smart glasses with mid-air gestures and smart phone with touch interaction to compare and evaluate the usage of such interfaces in a production cell comprising an industrial robot.
Computer Graphics Forum, 2010
2019 11th International Conference on Virtual Worlds and Games for Serious Applications (VS-Games), 2019
To increase the interest of young people in the technological and scientific aspects of space res... more To increase the interest of young people in the technological and scientific aspects of space research, the European Space Education Resources Office (ESERO) has decided to develop a set of games with space themes. Our group was selected to design and implement a game in virtual reality. In this paper, we describe the main design principles, interaction and navigation techniques, and technological details of the final game titled Moon Base.
This technical report summarize results of three-year project which dealt with research in the ar... more This technical report summarize results of three-year project which dealt with research in the area of reconstruction and generation of virtual cities. The project connects several fields of research like 3D reconstruction, procedural generation of cities and buildings, grammar extraction, agent technologies, cloud computing, user interaction and further. The unpublished results are presented together with references on published papers. All results and working data were collected at one place and references to this place are mentioned at appropriate parts.
Proceedings of the 14th International Conference on Software Technologies, 2019
This paper presents a review of various techniques for improving the performance of neural networ... more This paper presents a review of various techniques for improving the performance of neural networks on segmentation task using 3D convolutions and voxel gridswe provide comparison of network with and without max pooling, weighting, masking out the segmentation results, and oversampling results for imbalanced training dataset. We also present changes to 3D U-net architecture that give better results than the standard implementation. Although there are many out-performing architectures using different data input, we show, that although the voxel grids that serve as an input to the 3D U-net, have limits to what they can express, they do not reach their full potential.
Eurographics 2012-Posters, 2012
A tool for user driven 3D reconstruction is presented in this poster together with ideas of tool ... more A tool for user driven 3D reconstruction is presented in this poster together with ideas of tool extension for a work in immersive environment with multi-user editing possibility. The main purpose of the tool is cultural heritage and architecture ...
Lecture Notes in Computer Science, 2009
Lecture Notes in Computer Science, 2012
Lecture Notes in Computer Science, 2009
IEEE Access, Dec 31, 2023
Muzeum Muzejní a vlastivedná práce, 2022
One of the challenges that museums often face is how to present their ‚treasures‘ in a form that ... more One of the challenges that museums often face is how to present their ‚treasures‘ in a form that is both comprehensive and relevant to today‘s audiences. Digital content alone is not enough in this context and 3D content is increasingly gaining importance. One of the most accessible and at the same time most effective 3D digitisation methods is photogrammetry. The result, if procedures are followed correctly, is not only high-quality content with a wide range of uses, but also potential stepping stones for effective business models. This can reduce acquisition costs quite significantly and make 3D digitisation accessible to a wider range of institutions.
International Journal of Heritage in the Digital Era, 2013
A large data set of input RAW photos for 3D reconstruction of historical paper model of Prague is... more A large data set of input RAW photos for 3D reconstruction of historical paper model of Prague is presented in this paper. The data acquisition process and its organisation are described in detail together with color and camera calibration algorithms used. Moreover, a complete reconstruction work-flow together with several cultural heritage applications are briefly presented. The subject of this 3D reconstruction has been the Langweil model of Prague, originally created in the first half of 19 th century. Three parts of this model with different characteristics are afforded for computer scientists through the internet.
The challenges for current state-of-the-art 3D reconstruction algorithms covered in the Langweil ... more The challenges for current state-of-the-art 3D reconstruction algorithms covered in the Langweil model of Prague data set are summarized in this poster. The model properties are presented together with problems which bring.
In this paper, we introduce a lightweight and robust tracking technique based on color balls. The... more In this paper, we introduce a lightweight and robust tracking technique based on color balls. The algorithm builds on a variant of randomized Hough transform and is optimized for a use in real-time applications like on low-cost Augmented Reality (AR) systems. With just one conventional color camera our approach provides the ability to determine the 3D position of several color balls at interactive frame rates on a common PC workstation. It is fast enough to be easily combined with another real-time tracking engine. In contrast to popular tracking techniques based on recognition of planar fiducial markers it offers robustness to partial occlusion, which eases handling and manipulation. Furthermore, while using balls as markers a proper haptic feedback and visual metaphor is provided. The exemplary use of our technique in the context of two AR applications indicates the effectiveness of the proposed approach.
2016 IEEE 14th International Conference on Industrial Informatics (INDIN), 2016
The role of human in the Industrie 4.0 vision is still considered as irreplaceable. Therefore, us... more The role of human in the Industrie 4.0 vision is still considered as irreplaceable. Therefore, user interfaces of cyberphysical systems involved in the production automation need to be well designed and taking into consideration the industrial application requirements. With the advances in augmented and virtual reality data visualization and novel interaction techniques like mid-air gestures, these approaches seem to be suitable for integration into the industry environment. This paper describes the implementation of an augmented reality application for smart glasses with mid-air gestures and smart phone with touch interaction to compare and evaluate the usage of such interfaces in a production cell comprising an industrial robot.
Computer Graphics Forum, 2010
2019 11th International Conference on Virtual Worlds and Games for Serious Applications (VS-Games), 2019
To increase the interest of young people in the technological and scientific aspects of space res... more To increase the interest of young people in the technological and scientific aspects of space research, the European Space Education Resources Office (ESERO) has decided to develop a set of games with space themes. Our group was selected to design and implement a game in virtual reality. In this paper, we describe the main design principles, interaction and navigation techniques, and technological details of the final game titled Moon Base.
This technical report summarize results of three-year project which dealt with research in the ar... more This technical report summarize results of three-year project which dealt with research in the area of reconstruction and generation of virtual cities. The project connects several fields of research like 3D reconstruction, procedural generation of cities and buildings, grammar extraction, agent technologies, cloud computing, user interaction and further. The unpublished results are presented together with references on published papers. All results and working data were collected at one place and references to this place are mentioned at appropriate parts.
Proceedings of the 14th International Conference on Software Technologies, 2019
This paper presents a review of various techniques for improving the performance of neural networ... more This paper presents a review of various techniques for improving the performance of neural networks on segmentation task using 3D convolutions and voxel gridswe provide comparison of network with and without max pooling, weighting, masking out the segmentation results, and oversampling results for imbalanced training dataset. We also present changes to 3D U-net architecture that give better results than the standard implementation. Although there are many out-performing architectures using different data input, we show, that although the voxel grids that serve as an input to the 3D U-net, have limits to what they can express, they do not reach their full potential.
Eurographics 2012-Posters, 2012
A tool for user driven 3D reconstruction is presented in this poster together with ideas of tool ... more A tool for user driven 3D reconstruction is presented in this poster together with ideas of tool extension for a work in immersive environment with multi-user editing possibility. The main purpose of the tool is cultural heritage and architecture ...
Lecture Notes in Computer Science, 2009
Lecture Notes in Computer Science, 2012
Lecture Notes in Computer Science, 2009