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Proceedings Article

Graphics hardware accelerated panorama builder for mobile phones

[+] Author Affiliations
Miguel Bordallo López, Jari Hannuksela, Olli Silvén

Univ. of Oulu (Finland)

Markku Vehviläinen

Nokia Research Ctr. (Finland)

Proc. SPIE 7256, Multimedia on Mobile Devices 2009, 72560D (January 28, 2009); doi:10.1117/12.816511
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From Conference Volume 7256

  • Multimedia on Mobile Devices 2009
  • Reiner Creutzburg; David Akopian
  • San Jose, CA | January 18, 2009

abstract

Modern mobile communication devices frequently contain built-in cameras allowing users to capture highresolution still images, but at the same time the imaging applications are facing both usability and throughput bottlenecks. The difficulties in taking ad hoc pictures of printed paper documents with multi-megapixel cellular phone cameras on a common business use case, illustrate these problems for anyone. The result can be examined only after several seconds, and is often blurry, so a new picture is needed, although the view-finder image had looked good. The process can be a frustrating one with waits and the user not being able to predict the quality beforehand. The problems can be traced to the processor speed and camera resolution mismatch, and application interactivity demands. In this context we analyze building mosaic images of printed documents from frames selected from VGA resolution (640x480 pixel) video. High interactivity is achieved by providing real-time feedback on the quality, while simultaneously guiding the user actions. The graphics processing unit of the mobile device can be used to speed up the reconstruction computations. To demonstrate the viability of the concept, we present an interactive document scanning application implemented on a Nokia N95 mobile phone.

© (2009) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Miguel Bordallo López ; Jari Hannuksela ; Olli Silvén and Markku Vehviläinen
"Graphics hardware accelerated panorama builder for mobile phones", Proc. SPIE 7256, Multimedia on Mobile Devices 2009, 72560D (January 28, 2009); doi:10.1117/12.816511; http://dx.doi.org/10.1117/12.816511


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