초록 ▼

A system 10 for reducing clutter in passive radiometric images of the ocean surface, the system including: a first polarizer 12 for generating a vertically polarized image of a selected patch of the ocean surface, the vertically polarized image including a first set of radiance data; a second polari

A system 10 for reducing clutter in passive radiometric images of the ocean surface, the system including: a first polarizer 12 for generating a vertically polarized image of a selected patch of the ocean surface, the vertically polarized image including a first set of radiance data; a second polarizer 14 for generating a horizontally polarized image of the selected patch of the ocean surface, the horizontally polarized image including a second set of radiance data; a processor 16 for computing a clutter reduction weighting factor from the first and the second sets of radiance data; and means 18 for combining the first set of radiance data with the second set of radiance data utilizing the weighting factor to generate a combined image with reduced wave clutter. The processor 16 includes means for computing a weighting factor for minimizing clutter-associated variance in the weighted combination of the first and the second sets of radiance data.

대표청구항 ▼

[ What is claimed is:] [1.] A method of reducing clutter in passive radiometric images of the ocean surface, the method comprising the steps of:a. generating a vertically polarized image of a selected patch of the ocean surface, the vertically polarized image comprising a first set of radiance data;

[ What is claimed is:] [1.] A method of reducing clutter in passive radiometric images of the ocean surface, the method comprising the steps of:a. generating a vertically polarized image of a selected patch of the ocean surface, the vertically polarized image comprising a first set of radiance data;b. generating a horizontally polarized image of the selected patch of the ocean surface, the horizontally polarized image comprising a second set of radiance data;c. determining a clutter reduction weighting factor from the first and the second sets of radiance data;i. performing a Fourier-transform on the vertically polarized image, xv, into a transform domain image, kv;ii. dividing the kv image into a plurality of subimages, kv(i), corresponding to n bands spanning the wavenumber range, where i=1 . . . n;iii. performing an inverse transform of the kv(i) subimages into physical space images xv(i);iv. performing a Fourier-transform on the horizontally polarized image, xh, into a transform domain image, kh;v. dividing the kh image into a plurality of subimages, kh(i), corresponding to the n bands spanning the wavenumber range;vi. performing an inverse transform of the kh (i)subimages; into physical images xh(i); and(vii) computing weighting factors w(i) by minimizing the variance in the weighted-sums xw: where EQU xw(i)=w(i)*xv+*xh(i); and(d) combination in the first set of radiance data with the second set of radiance data utilizing the weighting factor to generate combined image written reduced wave clutter.