Freeman/eigenvalue decomposition method of adaptive volume scattering model
A technology of eigenvalue decomposition and scattering model, which is applied in the field of image processing, can solve the problem of overestimation of volume scattering, achieve the effect of reducing the proportion of pixels, increasing the proportion, and suppressing the overestimation of volume scattering
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Embodiment 1
[0032] The present invention is a freeman / eigenvalue decomposition method of an adaptive volume scattering model, see figure 1 , including the following steps:
[0033] (1) Input the polarimetric SAR image data matrix:
[0034] Direct input of polarization SAR image coherence matrix T or covariance matrix C, when the input data is coherence matrix T, T contains six matrices T 11 , T 12 , T 13 , T 22 , T 23 , T 33 , represents the polarization information of each pixel in the polarimetric SAR image; when the input data is a covariance matrix C, C contains six matrices C 11 ,C 12 ,C 13 ,C 22 ,C 23 ,C 33, represents the polarization information of each pixel in the polarimetric SAR image; the covariance matrix C and the coherence matrix T can be converted to each other. This example uses the polarization coherence matrix T as input.
[0035] (2) Exquisite Lee filtering:
[0036] Using the refined Lee filtering method, the polarimetric SAR image is filtered to remove...
Embodiment 2
[0050] The freeman / eigenvalue decomposition method of the adaptive volume scattering model is the same as in embodiment 1, and the new phase difference NPD is obtained by the polarization azimuth angle θ in step (4), including the following steps:
[0051] 4a) Calculate the co-polarization phase difference CPD:
[0052]
[0053] The left side of the above formula represents the exponential form of the complex number, and the co-polarization phase difference CPD is equal to ρ HHVV denotes the co-polarization correlation coefficient. The middle of the above formula represents the general form of the relevant element items of the covariance matrix C of the input polarimetric SAR image, where:
[0054]
[0055]
[0056]
[0057] C 11 ,C 33 ,C 13 is the correlation item of the covariance matrix C.
[0058] 4b) Calculate the cross-polarization phase difference XPD:
[0059]
[0060] The left side of the above formula represents the exponential form of the comp...
Embodiment 3
[0074] The freeman / eigenvalue decomposition method of the self-adaptive volume scattering model is the same as embodiment 1-2, and the threshold value of the new phase difference NPD that is used for judging is determined in the step (6) of the present invention, judges the region where the target is located, and carries out corresponding break down.
[0075] The original hybrid freeman / eigenvalue decomposition algorithm form in the prior art:
[0076]
[0077] α represents the scattering angle, P s Indicates the surface scattered power, P d Indicates the even scattered power, P v Indicates the volume scattered power.
[0078] According to the original mixed freeman / eigenvalue decomposition:
[0079]
[0080]
[0081]
[0082] the t above ab , a,b∈(1,2,3) represent the corresponding items of the coherence matrix T of the polarimetric SAR image. The volume scattering power P of each pixel can be obtained from the above formula v , surface scattering power P s ...
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