Copyright © 2008 The Institute of Electronics, Information and Communication Engineers
Special Section on Selected Papers from the 20th Workshop on Circuits and Systems in Karuizawa -- Papers |
Functionally Layered Video Coding for Water Level Monitoring
1 The authors are with Nagaoka University of Technology, Nagaoka-shi, 940-2188 Japan. E-mail: iwahashi{at}vos.nagaokaut.ac.jp, 2 The author is with Niigata University, Niigata-shi, 950-2181 Japan.
This paper proposes a new type of layered video coding especially for the use of monitoring water level of a river. A sensor node of the system decomposes an input video signal into some kinds of component signals and produces a bit stream functionally separated into three layers. The first layer contains the minimum components effective for detecting the water level. It is transmitted at very low bit rate for regular monitoring. The second layer contains signals for thumb-nail video browsing. The third layer contains additional data for decoding the original video signal. These are transmitted in case of necessity. A video signal is decomposed into several bands with the three dimensional Haar transform. In this paper, optimum bands to be contained into the 1st layer are experimentally investigated considering both of water level detection and data size to be transmitted. As a result, bit rate for transmitting the first layer is reduced by 32.5% at the cost of negligible 3.7% decrease of recognition performance for one of video examples.
Key Words: water, recognition, video, coding, scalable
Manuscript received June 26, 2007. Manuscript revised October 15, 2007.
Reference
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