| 1. |
- Khan, Muhammad Sikandar Lal, 1988-, et al.
(författare)
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Face-off : A face reconstruction technique for virtual reality (VR) scenarios
- 2016
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Ingår i: 14th European Conference on Computer Vision, ECCV 2016. - Cham : Springer. - 9783319466033 - 9783319466040 ; , s. 490-503
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Konferensbidrag (refereegranskat)abstract
- Virtual Reality (VR) headsets occlude a significant portion of human face. The real human face is required in many VR applications, for example, video teleconferencing. This paper proposes a wearable camera setup-based solution to reconstruct the real face of a person wearing VR headset. Our solution lies in the core of asymmetrical principal component analysis (aPCA). A user-specific training model is built using aPCA with full face, lips and eye region information. During testing phase, lower face region and partial eye information is used to reconstruct the wearer face. Online testing session consists of two phases, (i) calibration phase and (ii) reconstruction phase. In former, a small calibration step is performed to align test information with training data, while the later uses half face information to reconstruct the full face using aPCAbased trained-data. The proposed approach is validated with qualitative and quantitative analysis.
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| 2. |
- Li, Bo, 1982-, et al.
(författare)
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Distinctive curve features
- 2016
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Ingår i: Electronics Letters. - : John Wiley & Sons. - 0013-5194 .- 1350-911X. ; 52:3, s. 197-198
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Tidskriftsartikel (refereegranskat)abstract
- Curves and lines are geometrical, abstract features of an image. Whereas interest points are more limited, curves and lines provide much more information of the image structure. However, the research done in curve and line detection is very fragmented. The concept of scale space is not yet fused very well into curve and line detection. Keypoint (e.g. SIFT, SURF, ORB) is a successful concept which represent features (e.g. blob, corner etc.) in scale space. Stimulated by the keypoint concept, a method which extracts distinctive curves (DICU) in scale space, including lines as a special form of curve features is proposed. A curve feature can be represented by three keypoints (two end points, and one middle point). A good way to test the quality of detected curves is to analyse the repeatability under various image transformations. DICU using the standard Oxford benchmark is evaluated. The overlap error is calculated by averaging the overlap error of three keypoints on the curve. Experiment results show that DICU achieves good repeatability comparing with other state-of-the-art methods. To match curve features, a relatively uncomplicated way is to combine local descriptors of three keypoints on each curve.
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| 3. |
- Söderström, Ulrik, 1978-, et al.
(författare)
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Toward emotional recognition during HCI using marker-based automated video tracking
- 2019
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Ingår i: Proceedings of the 31st european conference on cognitive ergonomics. - New York, NY, USA : Association for Computing Machinery (ACM). ; , s. 49-52, s. 49-52
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Konferensbidrag (refereegranskat)abstract
- Postural movement of a seated person, as determined by lateral aspect video analysis, can be used to estimate learning-relevant emotions. In this article the motion of a person interacting with a computer is automatically extracted from a video by detecting the position of motion-tracking markers on the person’s body. The detection is done by detecting candidate areas for marker with a Convolutional Neural Network and the correct candidate areas are found by template matching. Several markers are detected in more than 99 % of the video frames while one is detected in only approximate to 80,2 % of the frames. The template matching can also detect the correct template in approximate to 80 of the frames. This means that almost always when the correct candidates are extracted, the template matching is successful. Suggestions for how the performance can be improved are given along with possible use of the marker positions for estimating sagittal plane motion.
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| 4. |
- Malhotra, Aman, et al.
(författare)
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Fixed camera drone based photogrammetry for indoor mapping
- 2022
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Ingår i: 9th IEEE Uttar Pradesh Section International Conference on Electrical, Electronics and Computer Engineering, UPCON 2022. - : Institute of Electrical and Electronics Engineers (IEEE). - 9798350332506
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Konferensbidrag (refereegranskat)abstract
- Point cloud data is a way of implementing and recreating the surrounding with the help of 3D imaging and rendering. These point clouds can be further converted into mesh and then 3d models that can be used for localisation and mapping. LIDAR (Light Detection and Ranging) is a common device that is used when we want to reconstruct a space(room or building) in a software 3D Mesh however LIDAR based systems are expensive and can be tricky to stitch and reconstruct, the proposed system uses a single camera, this single camera is going to capture the frame in a continuous manner. This frame capturing will be followed by feature extraction which is essentially going to help in comparing the motion of the camera by comparing the transformation of the frames relative to the previous frame. This process when implemented over a continuous frame path is going to help us build a 3D Space with the help of a process called photogrammetry. This can then be used in spatial planning or areas where the possibility of using lidar is not possible or the cost is too high for implementation. The estimated size from the sensor usually only differs a few centimeters from manually measured sizes. From 24 images the drone can generate more than 12000 feature points for photogrammetry and a point cloud with almost 10000 points for a room with a lot of features.
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| 5. |
- Mejtoft, Thomas, Universitetslektor, 1976-, et al.
(författare)
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Cookies and Trust : Trust in organizations and the design of cookie consent prompts
- 2023
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Ingår i: ECCE '23. - New York, NY : ACM Digital Library. - 9798400708756
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Konferensbidrag (refereegranskat)abstract
- The General Data Protection Regulation (GDPR) was passed in 2016 to regulate companies’ use and storage of personal data, such as cookies, which are a common feature of the modern internet used to track user’s activity and preferences. This paper aims to examine people’s perspectives on cookie consent prompts and the effects of using deceptive design in cookie consent prompts.The results suggest that the design, rather than trust in the website’s organization, is crucial for users’ decisions to accept, decline, or manage cookies. Honest design is emphasized, and the dangers of deceptive design in cookie consent prompts are highlighted. Prompts that require full attention from the user and cover the content of the page are more likely to result in reflective and active decisions, but design friction that forces users to make a reflective choice causes irritation. The study also reveals a discrepancy between self-reported and observed behavior regarding cookie acceptance, as users tend to accept more cookies than they say they do.
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| 6. |
- Mejtoft, Thomas, Universitetslektor, 1976-, et al.
(författare)
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Creative Capabilities of Machine Learning : Evaluating music created by algorithms
- 2021
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Ingår i: ACM International Conference Proceeding Series. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450387576
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Konferensbidrag (refereegranskat)abstract
- The concept of creativity is an important part of human society and the continuous evolution of artificial minds has raised questions on creativity among machines. This aim of the this study is to explore machine learning algorithms' ability to be creative. The study reported in this paper uses short samples of music generated by IBM Watson beats that are evaluated using expert assessment of 51 music teachers together with samples generated by humans as control samples. The results show that one of the machine learning generated samples showed the same level of creativity as the human generated samples. Hence, there are indications that today machine learning algorithms can create music that is hard to distinguish from human created music and can be considered creative.
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| 7. |
- Mejtoft, Thomas, Universitetslektor, 1976-, et al.
(författare)
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Deceptive design : cookie consent and manipulative patterns
- 2021
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Ingår i: 34th Bled eConference: Digital Support from Crisis to Progressive Change. - Maribor, Slovenia : University of Maribor Press. - 9789612864859 ; , s. 397-408
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Konferensbidrag (refereegranskat)abstract
- As a larger proportion of our lives moves onto the web, so does important and valuable information. This has led to an increase in different kinds of manipulative patterns (dark patterns) in web design with the sole purpose of being deceptiveand tricking users. This paper discusses the comprehensive suite of deceptive design patterns on Internet services where the users are expected to comply with the use of cookies. This was done by analyzing 50 different home cooking recipe websites, regarding their appliance to GDPR and how they use different dark patterns in their design. Even though legislation tries tomove the choices from the website to the user, it is clear that by using deceptive design patterns it is possible to “bypass” the legislation and trick the user into making a favorable choice for the owners behind the website. The results show that out of the websites that were GDPR approved, a majority still use two types of deceptive design patterns - misdirection and sneak into basket.
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| 8. |
- Mejtoft, Thomas, Universitetslektor, et al.
(författare)
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Design Friction : How intentionally added friction affect users level of satisfaction
- 2019
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Ingår i: ECCE 2019. - New York, NY : ACM Press. - 9781450371667 ; , s. 41-44
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Konferensbidrag (refereegranskat)abstract
- This study evaluates if intentionally added design friction affects users level of satisfaction when using a mobile application. Today most applications are designed to have as little friction as possible. An interesting question is if a more mindful interaction will lead to more satisfied users. In this study two prototypes inspired by the Headspace application where tested. One prototype had added design friction and the other had none. The participants were asked to rate their experience and to choose which prototype they preferred. The result shows that most participants of the test would choose the mobile application with added design friction and that they felt more satisfied when they had a clear understanding of the goal of the task.
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| 9. |
- Mejtoft, Thomas, Universitetslektor, 1976-, et al.
(författare)
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Design friction and digital nudging : impact on the human decision-making process
- 2023
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Ingår i: IVSP '23. - New York : Association for Computing Machinery (ACM). - 9781450398381 ; , s. 183-190
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Konferensbidrag (refereegranskat)abstract
- People make a vast number of decisions every day and these decisions invoke either a reflective or automatic behavior. Using e.g., nudging to influence a person’s behavior in a positive direction can have beneficial sustainable effects. This study aims to illustrate how digital nudging and design friction can be used to induce a reflective behavior in users of digital services during their decision-making. The field of study is the user’s reflection regarding sustainable choices when ordering meals online. The results provided from this initial case study showed that the participants preferred prototypes with implemented design approaches of digital nudging and design friction over a neutral prototype. Nudging had great impact on the decision-making process and provided feelings such as guilt if the participants did not select the option with the lowest carbon footprint. The design approach also induced a reflective behavior among the participants. Introducing so-called design friction provided a reflective behavior but had no impact on the participants decisions. Results also showed that even detailed information in the neutral prototype provided an informative and reflective behavior, which in some of the cases had an impact on the participants’ decisions.
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| 10. |
- Mejtoft, Thomas, Universitetslektor, 1976-, et al.
(författare)
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Designing call to action : Users’ perception of different characteristics
- 2021
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Ingår i: 34th Bled eConference: Digital Support from Crisis to Progressive Change. - : University of Maribor University Press. - 9789612864859 ; , s. 405-416
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Konferensbidrag (refereegranskat)abstract
- This paper aims to provide guidance when designing acall to action in a digital system with the purpose to create anintended feeling and user engagement. The paper is based on a test of four different simple call to action constructions. The users clearly prefer constructions that have a high explainability and feels intuitive. Hence, the design should have a high level of transparency and show the user straight away what it demands from the user and what the result of the action is. Furthermore, the design should have a high usability to make it clear how touse the call to action.
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