New Method for Ship Detection. Jian Yang Hongji Zhang Dept. of Electronic Eng., Tsinghua Univ. Yoshio Yamaguchi Dept. of Inform. Eng., Niigata Univ. Outline. Background Polarization Entropy and Similarity Parameter GOPCE based ship detection Experiment Results Summary. 1. Background.
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Jian Yang Hongji Zhang
Dept. of Electronic Eng., Tsinghua Univ.
Dept. of Inform. Eng., Niigata Univ.
Ioannidis Hammers Kostinski
Boerner Yamaguchi Yang
From the least square method and Vieta's Theorem
The average error:
The Formula has a good approximation to the theoretical value of the polarization entropy
Eigenvalues and logarithm are unnecessary!!!
Running Time by the proposed formula is only 5% of that by the traditional approach
J. Yang, Y. Chen, Y. Peng, Y. Yamaguchi, H. Yamada, “New formula of the polarization entropy”, IEICE Trans. Commun., 2006, E89-B(3), 1033-1035
J. Yang, et al., “Similarity between two scattering matrices,” Electronics Letters, vol.37, no. 3, pp. 193-194, 2001.
Similarity between a target and a diplane:
J. Yang, Y. Yamaguchi, W. -M. Boerner, S. M. Lin, “Numerical methods for solving the optimal problem of contrast enhancement,” IEEE Trans. Geosci. Remote Sensing, 2000, 38(2), pp. 965-971
J. Yang, et al., “Generalized optimization of polarimetric contrast enhancement”, IEEE GRSL., vol.1, no.3, pp.171-174, 2004
For a sea area
NASA/JPL AirSAR over Sydney coast, Australia.
Power Image by OPCE
GP Image by GOPCE
Filtered result by PWF
false alarm rate 1%
(1) OPCE has been developed
(2) GOPCE is effective for ship detection
Scattering from distributed scatterers
Coherent interferences of waves scattered from many randomly distributed scatterers in the resolution cell
These two objectives should
be achieved simultaneously
Pixel selected for averaging
8-direction edge detectors
Summary of Speckle Filtering : Two-Step Methodology
patch : pixel itself and its
non-local area :other than
pre-test : selecting homogenous
pixels in non-local area by patch
An example of pre-testing homogenous pixels in non-local area by patch
- For each pixel in non-local searching area
Calculate the similarity between 2 patches
searching area of
SAR-Convair 580 C-band
Image size : 340*220
Resolution : 6.4m*10m
(b) Refined Lee