| 1. |
- Li, Liu, 1965-, et al.
(författare)
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Vibrotactile chair : A social interface for blind
- 2006
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Ingår i: Proceedings SSBA 2006. - Umeå : Umeå universitet. Institutionen för datavetenskap. ; , s. 117-120
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this paper we present our vibrotactile chair, a social interface for the blind. With this chair the blind can get on-line emotion information from the person he / she is heading to. This greatly enhances communication ability and improve the quality of social life of the blind. In the paper we are discussing technical challenges and design principles behind the chair, and introduce the experimental platform: tactile facial expression appearance recognition system (TEARS)TM".
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| 2. |
- ur Réhman, Shafiq, 1978-, et al.
(författare)
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Facial expression appearance for tactile perception of emotions
- 2007
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Ingår i: Proceedings of Swedish symposium on image analysis, 2007. ; , s. 157-160
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Konferensbidrag (refereegranskat)abstract
- To enhance the daily life experience for visually challengedpersons, the Facial Expression Appearance for Tactile systemis proposed. The manifold of facial expressions is used fortactile perception. Locally Linear Embedding (LLE) codingalgorithm is implemented for tactile display. LLE algorithmis extended to handle the real time video coding. The vibrotactilechair as a social interface for the blind is used to displaythe facial expression. The chair provides the visuallyimpaired with on-line emotion information about the personhe/she is approaching. The preliminary results are encouragingand show that it greatly enhances communication abilityof the visually impaired person.
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| 3. |
- ur Réhman, Shafiq, 1978-, et al.
(författare)
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How to use manual labelers in evaluation of lip analysis systems?
- 2009
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Ingår i: Visual speech recognition. - USA : IGI Global. - 9781605661865 ; , s. 239-259
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The purpose of this chapter is not to describe any lip analysis algorithms but rather to discuss some of the issues involved in evaluating and calibrating labeled lip features from human operators. In the chapter we question the common practice in the field: using manual lip labels directly as the ground truth for the evaluation of lip analysis algorithms. Our empirical results using an Expectation-Maximization procedure show that subjective noise in manual labelers can be quite significant in terms of quantifying both human and algorithm extraction performance. To train and evaluate a lip analysis system one can measure the performance of human operators and infer the “ground truth” from the manual labelers, simultaneously.
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| 4. |
- ur Réhman, Shafiq, 1978-, et al.
(författare)
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Lip segmentation : performance evaluation criteria
- 2006
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In this work, we determined the measure to compare and evaluate the performance of lip detection techniques.Despite of a number of methods used for lip-detecction/localization, a reliable method for comparing and determining the quality of the result is still missing. The proposed criterion ensures the clear and fair way to report the results so that mentioned results can be comparable and measurable to enhance the quality of lip detection and/or error rate. After applying the EM-like algorithm it is showed that performance of the specific technique can be evaluated.
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| 5. |
- ur Réhman, Shafiq, 1978-, et al.
(författare)
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Lipless tracking and emotion estimation
- 2007
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Ingår i: <em>Proceedings of IEEE 3rd International Conference on Signal ImageTechnology & Internet based Systems </em>. - Shanghai, China : IEEE. - 9780769531229 ; , s. 768-774
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Konferensbidrag (refereegranskat)abstract
- Automatic human lip tracking is one of the key components to many facial image analysis tasks, such as, lip-reading and emotion from lips. It has been a classical hard image analysis problem over decades. In this paper, we propose an indirect lip tracking strategy: ‘lipless tracking’. It is based on the observation that many of us don’t have clear lips and some even don’t have visible lips. The strategy is to select and localize stable lip features around the mouth for tracking. For this purpose deformable contour-segments are modelled based on lip features and tracking is done using dynamic programming and viterbi algorithm. The strength of proposed algorithm is demonstrated in emotion estimation domain. Finally, real-time video experiments performed on private and publicly available data sets (MMI face database) have shown the robustness of our proposed lipless tracking technique.
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| 6. |
- ur Réhman, Shafiq, 1978-, et al.
(författare)
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Tactile car warning system
- 2005
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Ingår i: Proceedings of first joint Euro Haptics conference and symposium on haptic interfaces for virtual environment and teleoperator systems. - Pisa, Italy : IEEE.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Driving on the busy road is a critical job. Drivers need to combine all senses to solve to handle upcoming events and situations. According to recent survey pedestrian based accidents represent a huge portion of traffic accidents in EU, it is stated that more than 200,000 pedestrians are injured and about 9,000 are killed in accidents yearly. Enormous amounts of research have been on the detectionDriving on the busy road is a critical job. Drivers need to combine all senses to solve to handle upcoming events and situations. According to recent survey pedestrian based accidents represent a huge portion of traffic accidents in EU, it is stated that more than 200,000 pedestrians are injured and about 9,000 are killed in accidents yearly. Enormous amounts of research have been on the detection of pedestrian from moving platform using different image processing techniques like shape/texture-based method. Currently, Guilloux and his colleague pointed out the advantages of using infrared cameras. A few pedestrian detection systems using infrared video sequences have been experimented as well. The possibilities of using the human hands as tactile sensory input are explored by the researchers in order to obtain precise knowledge for building tactual display. Recently a number of vibrotactile devices have been accessible for experimental as well as commercial reason. We present a driver assistant system which will provide tactual alert on detection of the pedestrians. The Different issues regarding the development of driver assistant program are considered. Here the Template matching based pedestrian detection in infrared videos is performed. Finally, ‘Driver assistant system’ experiment is presented.
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| 7. |
- ur Réhman, Shafiq, 1978-, et al.
(författare)
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Turn your mobile into the football : rendering live football game by vibration
- 2008
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Ingår i: IEEE transactions on multimedia. - 1520-9210 .- 1941-0077. ; 10:6, s. 1022-1033
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Tidskriftsartikel (refereegranskat)abstract
- Vibration offers many potential benefits for the use of mobile phones. In this paper, we propose a new method of rendering live football game on mobile phones using vibration. A mobile phone is “synchronized” with the ball in the real field. By holding the phone, users are able to experience dynamic movements of the ball, to know attacking directions and which team is leading the attack. The usability test of our system shows that vibrotactile display is suitable for rendering live football information on mobile phones by adopting designed coding schemes with a right training process.
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| 8. |
- Karlsson, Johannes, 1977-, et al.
(författare)
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Demonstration of Wyner-Ziv video compression in a wireless camera sensor network
- 2009
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Ingår i: The 9th Scandinavian Workshop on Wireless Ad-hoc & Sensor Networks (ADHOC'09 ). 4-5 May 2009, Uppsala, Sweden.. - Uppsala.
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Konferensbidrag (refereegranskat)abstract
- Sending video over wireless sensor networks is a challenging task. The encoding and transmission of video is very resource hungry and the sensor nodes have very limited resources in terms of communication bandwidth,memory, computation and typically 5-10 times. In this paper we will present a practical implementation of a Wyner-Ziv video codec where the reversed asymmetry in complexity between encoder and decoder can be achieved. We will also present our sensor network platform used in this demonstration known as Fleck TM-3 as well as two different co-processor daughterboards for image processing. The different daughterboards are then compared in terms of speed and energy consumption.
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| 9. |
- Karlsson, Johannes, 1977-, et al.
(författare)
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Efficient P2P mobile service for live media streaming
- 2006
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Ingår i: Proceedings of the Australian Telecommunication Networks and Applications Conference (ATNAC 2006). 4-6 December 2006, Melbourne, Australia..
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Konferensbidrag (refereegranskat)abstract
- Mobile TV is a new interesting area in the telecommunication industry. The technology for sending live video to mobile clients is characterized by relatively low CPU processing power, low network resources, and low display resolution. In this paper we discuss a solution to all of these problems by using application layer multicasting. This can significantly reduce the needed bitrate and required computing resources for each client. At the same time the received video quality is increased. Several different methods for splitting the video into substreams are discussed. Simulations for the local wireless ad-hoc network are performed. A system for application layer multicasting using layered H.264 is also presented.
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| 10. |
- Karlsson, Johannes, 1977-, et al.
(författare)
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Enabling real-time video services over ad-hoc networks opens the gates for e-learning in areas lacking infrastructure
- 2009
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Ingår i: International Journal of Interactive Mobile Technologies (iJIM). - Wien, Austria : International Association of Online Engineering. - 1865-7923. ; 3:4, s. 17-23
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we suggest a promising solution to come over the problems of delivering e-learning to areas with lack or deficiencies in infrastructure for Internet and mobile communication. We present a simple, reasonably priced and efficient communication platform for providing e-learning. This platform is based on wireless ad-hoc networks. We also present a preemptive routing protocol suitable for real-time video communication over wireless ad-hoc networks. Our results show that this routing protocol can significantly improve the quality of the received video. This makes our suggested system not only good to overcome the infrastructure barrier but even capable of delivering a high quality e-learning material.
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