Pub Date : 2011-12-01DOI: 10.1109/ANTS.2011.6163625
M. Zarki, Brigitte Jaumard, Venkatesh Krishnaswamy
Pico projectors are expected to become increasingly popular in the near future, in particular when embedded in mobile devices such as smart phones, portable media players and digital cameras. The average consumer, seeking more features and attracted to all in one portable devices, will find such integrated devices very appealing. However the resolution and the brightness provided by integrated mobile projectors are much lower than what standard projectors commonly offer. Our collaborative scheme based on our synchronization technique provides a means of increasing resolution and brightness for the video projected by such mobile devices, significantly enhancing the viewing experience for the user. In this talk, I will present a collaborative video playback on mobile projectors, set out and managed only through visual feedback. More specifically I will introduce a camera-based video synchronization algorithm that allows a federation of projection-enabled mobile devices to collaboratively present a full video stream that consists of multiple sub streams, each streamed to a different mobile device constituting the ensemble. Since the synchronization does not use any wireless network infrastructure, it is independent of network congestion and connectivity. For this project we combined our synchronization method with existing distributed registration techniques to demonstrate a synchronized video stream for a collaborative federation of four projectors arranged in a 2×2 array.
{"title":"Invited talks: Collaborative video playback on a federation of tiled mobile projectors enabled by visual feedback","authors":"M. Zarki, Brigitte Jaumard, Venkatesh Krishnaswamy","doi":"10.1109/ANTS.2011.6163625","DOIUrl":"https://doi.org/10.1109/ANTS.2011.6163625","url":null,"abstract":"Pico projectors are expected to become increasingly popular in the near future, in particular when embedded in mobile devices such as smart phones, portable media players and digital cameras. The average consumer, seeking more features and attracted to all in one portable devices, will find such integrated devices very appealing. However the resolution and the brightness provided by integrated mobile projectors are much lower than what standard projectors commonly offer. Our collaborative scheme based on our synchronization technique provides a means of increasing resolution and brightness for the video projected by such mobile devices, significantly enhancing the viewing experience for the user. In this talk, I will present a collaborative video playback on mobile projectors, set out and managed only through visual feedback. More specifically I will introduce a camera-based video synchronization algorithm that allows a federation of projection-enabled mobile devices to collaboratively present a full video stream that consists of multiple sub streams, each streamed to a different mobile device constituting the ensemble. Since the synchronization does not use any wireless network infrastructure, it is independent of network congestion and connectivity. For this project we combined our synchronization method with existing distributed registration techniques to demonstrate a synchronized video stream for a collaborative federation of four projectors arranged in a 2×2 array.","PeriodicalId":116048,"journal":{"name":"IEEE ANTS","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124894470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/ANTS.2014.7057266
Raja Vara Prasad Yerra, P. Rajalakshmi
Design of energy efficient wireless networks is the primary research goal for evolving billion device applications like Internet of Things (IoT), smart grids and Cyber Physical Systems (CPS). Energy efficient models can reduce megawatts of power through out globe thereby reducing carbon foot print by improving overall network lifetime of large scale networks. Recent advances in physical layer have optimized energy consumption of IEEE 802.15.4 Physical layer, but energy efficiency of MAC and network layers is also essential to realise Green wireless networks. Though anycast multi-hop communication is initiated by many recent researchers by obtaining reliability, delay and energy expressions, still there is no model that captures relay nodes state wise behaviour effectively. In this paper a new energy model with 3-dimensional Markov MAC model with generalized any cast routing and state behaviour is proposed and developed for asynchronous wireless ad hoc networks. Proposed state behaviour of node model has consideration of MAC and network parameters like minimum backoff exponent, maximum backoff stages and retries along with network parameters like packet length, wake up rate, Sleep, Idle-Listen, Active-Tx and Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) states. Results show that total energy of derived model depends on many network and MAC parameters. Affect of most of the considered parameters are analysed with simulation results. Total energy of the multi-hop network reduced to 25% with variation in minimum backoff exponent and increased by 45% with increase in packet length. It is observed that derived analytical energy model better fits with most of the parameters that affects energy.
{"title":"Novel energy model to analyze the effect of MAC and network parameters on asynchronous IEEE 802.15.4 multi-hop wireless networks lifetime","authors":"Raja Vara Prasad Yerra, P. Rajalakshmi","doi":"10.1109/ANTS.2014.7057266","DOIUrl":"https://doi.org/10.1109/ANTS.2014.7057266","url":null,"abstract":"Design of energy efficient wireless networks is the primary research goal for evolving billion device applications like Internet of Things (IoT), smart grids and Cyber Physical Systems (CPS). Energy efficient models can reduce megawatts of power through out globe thereby reducing carbon foot print by improving overall network lifetime of large scale networks. Recent advances in physical layer have optimized energy consumption of IEEE 802.15.4 Physical layer, but energy efficiency of MAC and network layers is also essential to realise Green wireless networks. Though anycast multi-hop communication is initiated by many recent researchers by obtaining reliability, delay and energy expressions, still there is no model that captures relay nodes state wise behaviour effectively. In this paper a new energy model with 3-dimensional Markov MAC model with generalized any cast routing and state behaviour is proposed and developed for asynchronous wireless ad hoc networks. Proposed state behaviour of node model has consideration of MAC and network parameters like minimum backoff exponent, maximum backoff stages and retries along with network parameters like packet length, wake up rate, Sleep, Idle-Listen, Active-Tx and Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) states. Results show that total energy of derived model depends on many network and MAC parameters. Affect of most of the considered parameters are analysed with simulation results. Total energy of the multi-hop network reduced to 25% with variation in minimum backoff exponent and increased by 45% with increase in packet length. It is observed that derived analytical energy model better fits with most of the parameters that affects energy.","PeriodicalId":116048,"journal":{"name":"IEEE ANTS","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124581187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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