Design of FIR Filter for Water Level Detection

This paper proposes a new design of spatial FIR filter to automatically detect water level from a video signal of various river surroundings. A new approach in this report applies "addition" of frames and a "horizontal" edge detector to distinguish water region and land region. Variance of each line of a filtered video frame is used as a feature value. The water level is recognized as a boundary line between the land region and the water region. Edge detection filter essentially demarcates between two distinctly different regions. However, the conventional filters are not automatically adaptive to detect water level in various lighting conditions of river scenery. An optimized filter is purposed so that the system becomes robust to changes of lighting condition. More reliability of the proposed system with the optimized filter is confirmed by accuracy of water level detection.

Authors:

• Sakol Udomsiri
• Masahiro Iwahashi

Keywords:

• water level
• video
• filter
• detection.

References:

[1] Ministry of international affairs and communications, Japan,
http://www.soumu.go.jp/english/index.html
[2] Ministry of Land, Infrastructure and Transport Government of Japan,
http://www.river.go.jp/
[3] Y. Takagi, A. Tsujikawa, M. Takato, T. Saito, M. Kaida,
"Development of a non-contact liquid level measuring system using
image processing", Water science and technology, vol. 37, no.12,
pp.381-387, 1998.
[4] Y. Takagi, T. Yoneoka, H. Mori, M. Yoda, A. Tsujikawa, T. Saito,
"Development of a water level measuring system using image
processing", The 1st IWA conference on instrumentation, control and
automation, pp.309-316, 2001.
[5] S. Kobayashi, S. Muramatsu, H. Kikuchi, M. Iwahashi, "Water Level
Tracking with Condensation Algorithm", International Workshop on
Advanced Image Technology (IWAIT), no.P7-43, pp.750-755,
Jan.2007.
[6] N. Tsunashima, M. Shiohara, S. Sasaki, J. Tanahashi, "Water level
measurement using image processing", Information processing society
of Japan, Research report, Computer vision and image media, vol.121,
no.15, pp.111-117, 2000.
[7] Y.Imai, M.Iwahashi, "Water level detection based on wavelet
transform of JPEG2000", IEICE circuits and systems "Karuizawa"
workshop, pp.531-534, 2006.4.
[8] M. Iwahashi, S. Udomsiri, Y. Imai, S. Fukuma, "Water Level Detection
for River Surveillance utilizing JP2K Wavelet Transform" APCCAS
2006
[9] D. Dunn, W. E. Higgins, "Optimal Gabor filter for texture
segmentation", IEEE Trans. image processing, vol.4, no.7, pp.947-964,
1995.
[10] H. Tanaka, Y. Yoshida, K. Fukami, H. Nakano, "Texture segmentation
using amplitude and phase information of Gabor filters", IEICE Trans.
D-II, vol.J84 -DII, no.12, pp.2565-2576, 2001. 12.
[11] M. Iwahashi, S. Udomsiri, Y. Imai, S. Tansuriyavong, "Functionally
Layered Coding For River Monitoring", IWAIT -07 , International
Workshop on Advanced Image Technology, no.P1-27, pp.918-923,
2007.
[12] M. Iwahashi, S. Udomsiri, Y. Imai, S. Muramatsu, "Water level
detection for functionally layered video coding", ICIP2007,
pp.321-324, 2007.
[13] A. Saito, M. Iwahashi, "Water Level Detection Algorithm based on
Synchronous Frame Addition and Filtering", IEICE circuits and
systems "Karuizawa" workshop, pp.525-530, 2006.
[14] M. Iwahashi, S. Udomsiri, "Water Level Detection From Video with
FIR Filtering", ICCCN2008, pp.826-831.
[15] Rafael C. Gonzalez, Richard E. Woods: "Digital Image
Processing",2nd.,Prentice-Hall Inc.,2002.
[16] Tinku A., Ajoy K. Ray, "Image Processing" , John Wiley & Sons, Inc.,
2005.