| 11. |
- Poikolainen Rosén, Anton, 1992-, et al.
(author)
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Relating to the Environment through Photography : the Smartphone Camera as a Tool in Urban Farming
- 2020
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In: OzCHI '20. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450389754 ; , s. 506-519
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Conference paper (peer-reviewed)abstract
- Research on environmental sustainability in HCI is investigating the opportunities and hindrances technologies pose on living sustainably, beyond direct material impact of production, use and disposal. With this background, we focus on the smartphone camera as a tool that allows users to quickly and relatively effortlessly depict, save, share, access, augment or amplify information about the environment. Based on two years of participant observation studies, we present examples of how urban farmers use the smartphone camera as a tool in their practice. We discuss how the smartphone camera mediates human experiences of the environment and how certain uses of the camera may contribute to environmental sustainability. We highlight how the smartphone camera used as a tool in gardening was experienced to support (a) feelings of closeness or bonds towards the local environment and (b) the creation and sharing of knowledge.
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| 12. |
- Qian, Kun, et al.
(author)
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An eye tracking based virtual reality system for use inside magnetic resonance imaging systems
- 2021
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322 .- 2045-2322. ; 11:1
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Journal article (peer-reviewed)abstract
- Patients undergoing Magnetic Resonance Imaging (MRI) often experience anxiety and sometimes distress prior to and during scanning. Here a full MRI compatible virtual reality (VR) system is described and tested with the aim of creating a radically different experience. Potential benefits could accrue from the strong sense of immersion that can be created with VR, which could create sense experiences designed to avoid the perception of being enclosed and could also provide new modes of diversion and interaction that could make even lengthy MRI examinations much less challenging. Most current VR systems rely on head mounted displays combined with head motion tracking to achieve and maintain a visceral sense of a tangible virtual world, but this technology and approach encourages physical motion, which would be unacceptable and could be physically incompatible for MRI. The proposed VR system uses gaze tracking to control and interact with a virtual world. MRI compatible cameras are used to allow real time eye tracking and robust gaze tracking is achieved through an adaptive calibration strategy in which each successive VR interaction initiated by the subject updates the gaze estimation model. A dedicated VR framework has been developed including a rich virtual world and gaze-controlled game content. To aid in achieving immersive experiences physical sensations, including noise, vibration and proprioception associated with patient table movements, have been made congruent with the presented virtual scene. A live video link allows subject-carer interaction, projecting a supportive presence into the virtual world.
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| 13. |
- Ranisch, Robert, et al.
(author)
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Digital contact tracing and exposure notification: ethical guidance for trustworthy pandemic management
- 2021
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In: Ethics and Information Technology. - : Springer Science and Business Media LLC. - 1388-1957 .- 1572-8439. ; 23, s. 285-294
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Journal article (peer-reviewed)abstract
- There is growing interest in contact tracing apps (CT apps) for pandemic management. It is crucial to consider ethical requirements before, while, and after implementing such apps. In this paper, we illustrate the complexity and multiplicity of the ethical considerations by presenting an ethical framework for a responsible design and implementation of CT apps. Using this framework as a starting point, we briefly highlight the interconnection of social and political contexts, available measures of pandemic management, and a multi-layer assessment of CT apps. We will discuss some trade-offs that arise from this perspective. We then suggest that public trust is of major importance for population uptake of contact tracing apps. Hasty, ill-prepared or badly communicated implementations of CT apps will likely undermine public trust, and as such, risk impeding general effectiveness.
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| 14. |
- Samuelsson, Robin, 1985-
(author)
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Cultural Heritage Through Educational Robots : Using a Ukrainian Folk Tale with a Programmable Robot in Early Childhood Education
- 2022
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In: HCI International 2022 – Late Breaking Posters. - Cham : Springer. - 9783031196782 - 9783031196799 ; , s. 336-343
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Conference paper (peer-reviewed)abstract
- Programmable robots are increasingly used to introduce computational thinking and programming to young children. However, how to practically introduce this is still being developed, where storytelling and project-based methods have been promoted as possible ways to achieve this. This paper presents a study from a preschool featuring 4–5 year-olds working with a Ukrainian folk tale, The Mitten, while introducing programming through a programmable floor robot, The Blue-Bot. The paper presents the iterative cycles during a design-based study of merging the folk tale with the Blue-Bot during the project. The paper further examines the educational affordances of a programming board created during the project, showing how the folk tale provided a fitting structure for the board and pedagogical scaffold during the activities. The paper discusses how older forms of cultural heritage can be merged with new technologies and the added importance of the particular case of Ukrainian cultural heritage following the outbreak of the war in Ukraine.
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| 15. |
- Wilhelmsson, Ulf, 1967-, et al.
(author)
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Everyone Is not a Gamer! : Developing Cultural Heritage Experiences for Diverse Audiences
- 2020
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In: Visual Computing for Cultural Heritage. - Cham : Springer. - 9783030371906 - 9783030371913 ; , s. 263-281
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Book chapter (peer-reviewed)abstract
- Serious games and gamification have been proposed as approaches to solve problems in various areas by utilizing game technologies, game design components and even fully fledged games. However, when games are applied in a context outside the gaming sphere where users are not used to game interfaces and game culture, this may cause problems. In the case of cultural heritage applications this may create confusion or even put people off if they don’t understand what to do to take part in the experience. This chapter contributes a synthesized retrospective overview of three successive research and development projects conducted at the University of Skövde since 2007 and will present theoretical frameworks, conceptual studies, and production models for cultural heritage experiences for diverse audiences. In particular, we present a detailed case of a cultural heritage site which has been enhanced by game design concepts and visualizations to provide a richer experience for visitors. The chapter will also show the importance of user experience testing as an integral part of the production cycle in order to ensure a pleasant and understandable visit for visitors with different backgrounds and experiences of video games.
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| 16. |
- Abedini, Fereshteh, 1989-
(author)
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2D and 3D Halftoning for Appearance Reproduction
- 2023
-
Doctoral thesis (other academic/artistic)abstract
- The appearance of an object is determined by its chromatic and geometric qualities in its surrounding environment using four optical parameters: color, gloss, translucency, and surface texture. Reconstructing the appearance of objects is of great importance in many applications, including creative industries, packaging, fine-art reproduction, medical simulation, and prosthesis-making. Printers are reproduction devices capable of replicating objects’ appearance in 2D and 3D forms. With the introduction of new printing technologies, new inks and materials, and demands for innovative applications, creating accurate reproduction of the desired visual appearance has become challenging. Thus, the appearance reproduction workflow requires improvements and adaptations. Accurate color reproduction is a critical quality measure in reproducing the desired appearance in any printing process. However, printers are devices with a limited number of inks that can either print a dot or leave it blank at a specific position on a substrate; hence, to reproduce different colors, optimal placement of the available inks is needed. Halftoning is a technique that deals with this challenge by generating a spatial distribution of the available inks that creates an illusion of the target color when viewed from a sufficiently large distance. Halftoning is a fundamental part of the color reproduction task in any full-color printing pipeline, and it is an effective technique to increase the potential of printing realistic and complex appearances. Although halftoning has been used in 2D printing for many decades, it still requires improvements in reproducing fine details and structures of images. Moreover, the emergence of new technologies in 3D printing introduces a higher degree of freedom and more parameters to the field of appearance reproduction. Therefore, there is a critical need for extensive studies to revisit existing halftoning algorithms and develop novel approaches to produce high quality prints that match the target appearance faithfully. This thesis aims at developing halftoning algorithms to improve appearance reproduction in 2D and 3D printing. Contributions of this thesis in the 2D domain is a dynamic sharpness-enhancing halftoning approach, which adaptively varies the local sharpness of the halftone image based on different textures in the original image for realistic appearance printing. The results show improvements in halftone quality in terms of sharpness, preserving structural similarity, and decreasing color reproduction error. The main contribution of this thesis in 3D printing is extending a high quality 2D halftoning algorithm to the 3D domain. The proposed method is then integrated with a multi-layer printing approach, where ink is deposited at variable depths to improve the reproduction of tones and fine details. Results demonstrate that the proposed method accurately reproduces tones and details of the target appearance. Another contribution of this thesis is studying the effect of halftoning on the perceived appearance of 3D printed surfaces. According to the results, changing the dot placement based on the elevation variation of the underlying geometry can potentially control the perception of the 3D printed appearance. It implies that the choice of halftone may prove helpful in eliminating unwanted artifacts, enhancing the object’s geometric features, and producing a more accurate 3D appearance. The proposed methods in this thesis have been evaluated using different printing techniques.
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| 17. |
- Abedini, Fereshteh, et al.
(author)
-
3D Halftoning based on Iterative Method Controlling Dot Placement
- 2020
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Conference paper (peer-reviewed)abstract
- Realistic appearance reproduction is of great importance in 3D printing’s applications. Halftoning as a necessary process in printing has a great impact on creating visually pleasant appearance. In this article, we study the aspects of adapting and applying Iterative Method Controlling Dot Placement (IMCDP) to halftone three-dimensional surfaces. Our main goal is to extend the 2D algorithm to a 3D halftoning approach with minor modifications. The results show high-quality reproduction for all gray tones. The 3D halftoning algorithm is not only free of undesirable artifacts, it also produces fully symmetric and wellformed halftone structures even in highlight and shadow regions.
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| 18. |
- Abedini, Fereshteh
(author)
-
Effect of halftones on printing iridescent colors
- 2023
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In: <em>IS&T Electronic Imaging</em>. - : The Society for Imaging Science and Technology. ; , s. 1-6
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Conference paper (peer-reviewed)abstract
- The iridescent effect produced by structural color is difficult (if not impossible) to capture and print using traditional CMYK pigments. The so called RGB reflective pigments, nonetheless, generate angle-dependent colors by light interference. A layered surface structure generated by the pigments’ particles on a substrate reflects light waves of different wavelengths at different viewing angles according to the optical principle known as the Bragg Law. In this work, we have studied the influence of different halftone structures on printed images, produced with RGB reflective inks via screen printing. The main goal was to enhance the iridescence of a printed reproduction by studying the performance of different halftone algorithms on a screen printing process. We investigated the influence of different halftone structures in creating different spatial combinations of inks on a print to reproduce the image of an iridescent feathered headdress. We applied first-order, second-order, and structure-aware FM halftones to compare how they influence the reproduction of the material appearance of the object represented in the original image. The results show that the structure-ware halftones improve the representation of the image structures and details. Therefore, it could better convey the 3D surface features that produce iridescence in real feathers.
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| 19. |
- Abedini, Fereshteh, et al.
(author)
-
Structure-Aware Color Halftoning with Adaptive Sharpness Control
- 2022
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In: Journal of Imaging Science and Technology. - : I S & T-SOC IMAGING SCIENCE TECHNOLOGY. - 1062-3701 .- 1943-3522. ; 66:6
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Journal article (peer-reviewed)abstract
- Structure-aware halftoning algorithms aim at improving their non-structure-aware version by preserving high-frequency details, structures, and tones and by employing additional information from the input image content. The recently proposed achromatic structure-aware Iterative Method Controlling the Dot Placement (IMCDP) halftoning algorithm uses the angle of the dominant line in each pixels neighborhood as supplementary information to align halftone structures with the dominant orientation in each region and results in sharper halftones, gives a more three-dimensional impression, and improves the structural similarity and tone preservation. However, this method is developed only for monochrome halftoning, the degree of sharpness enhancement is constant for the entire image, and the algorithm is prohibitively expensive for large images. In this paper, we present a faster and more flexible approach for representing the image structure using a Gabor-based orientation extraction technique which improves the computational performance of the structure-aware IMCDP by an order of magnitude while improving the visual qualities. In addition, we extended the method to color halftoning and studied the impact of orientation information in different color channels on improving sharpness enhancement, preserving structural similarity, and decreasing color reproduction error. Furthermore, we propose a dynamic sharpness enhancement approach, which adaptively varies the local sharpness of the halftone image based on different textures across the image. Our contributions in the present work enable the algorithm to adaptively work on large images with multiple regions and different textures. (C) 2022 Society for Imaging Science and Technology.
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| 20. |
- Abedini, Fereshteh, et al.
(author)
-
Structure-Aware Halftoning Using the Iterative Method Controlling the Dot Placement
- 2021
-
In: Journal of Imaging Science and Technology. - : I S & T-SOC IMAGING SCIENCE TECHNOLOGY. - 1062-3701 .- 1943-3522. ; 65:6
-
Journal article (peer-reviewed)abstract
- Many image reproduction devices, such as printers, are limited to only a few numbers of printing inks. Halftoning, which is the process to convert a continuous-tone image into a binary one, is, therefore, an essential part of printing. An iterative halftoning method, called Iterative Halftoning Method Controlling the Dot Placement (IMCDP), which has already been studied by research scholars, generally results in halftones of good quality. In this paper, we propose a structure-based alternative to this algorithm that improves the halftone image quality in terms of sharpness, structural similarity, and tone preservation. By employing appropriate symmetrical and non-symmetrical Gaussian filters inside the proposed halftoning method, it is possible to adaptively change the degree of sharpening in different parts of the continuous-tone image. This is done by identifying a dominant line in the neighborhood of each pixel in the original image, utilizing the Hough Transform, and aligning the dots along the dominant line. The objective and subjective quality assessments verify that the proposed structure-based method not only results in sharper halftones, giving more three-dimensional impression, but also improves the structural similarity and tone preservation. The adaptive nature of the proposed halftoning method makes it an appropriate algorithm to be further developed to a 3D halftoning method, which could be adapted to different parts of a 3D object by exploiting both the structure of the images being mapped and the 3D geometrical structure of the underlying printed surface.
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