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Scalable Visual Cod...
Scalable Visual Codes for Embedding Digital Data in the Physical World
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- Hermans, Frederik (författare)
- Uppsala universitet,Datorarkitektur och datorkommunikation,Uppsala Networked Objects,Uppsala University, Sweden
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- McNamara, Liam (författare)
- RISE,SICS
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- Voigt, Thiemo (författare)
- RISE,Uppsala universitet,Datorarkitektur och datorkommunikation,SICS, Stockholm, Sweden,Computer Systems Laboratory,Uppsala University, Sweden
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(creator_code:org_t)
- 2015-11
- 2015
- Engelska.
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Ingår i: Proceedings of the 13th ACM Conference on Embedded Networked Sensor Systems. - ACM : ACM. - 9781450336314 ; , s. 457-458
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Abstract
Ämnesord
Stäng
- Visual codes, such as QR codes, offer a low-cost alternative to RF technology when digital data needs to be embedded in objects in the physical world. However, in order to support receivers with a poor visual channel, e.g. low-resolution cameras, most visual codes are designed for low data capacity and short reading distances. We present our work on Focus, a visual code that avoids earlier work's explicit trade-off between code capacity and channel quality. Rather than encoding the payload directly into individual pixels, Focus encodes the payload over a range of spatial frequencies. As a result, even a receiver with a very poor visual channel (e.g., a low-resolution camera, or a camera experiencing motion blur) can still partly decode a Focus code, because the code's low-frequency components are robust to common channel impairments. A receiver with a good channel can decode all data from the same code. In our demo, we will present a prototype of Focus for smartphones and showcase how it deals with common impairments of the visual channel.
Ämnesord
- NATURVETENSKAP -- Data- och informationsvetenskap -- Datorteknik (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Computer Engineering (hsv//eng)
- NATURVETENSKAP -- Data- och informationsvetenskap (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences (hsv//eng)
Nyckelord
- Datavetenskap med inriktning mot datorkommunikation
- Computer Science with specialization in Computer Communication
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)
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