SAR ATR treeline extended operating condition
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Abstract
A synthetic aperture radar acquires an image of one or more objects and identifies them as targets. The objects are located in the proximity of clutter within the image such of trees, or a tree line. The radar acquires a SAR image having pixels descriptive of the clutter and the object(s). Regions having object pixels are identified within the synthetic aperture image using an object identification (algorithm), where the object identification (algorithm) utilizes one or more historically known target characteristics and one or more measured characteristic to obtain an output. Boundaries are identified for the one or more objects within the output using an object isolation, such as, for example, a Watershed transform. Clutter pixels are identified external to the one or more objects. The clutter pixels are suppressed from the synthetic aperture image thereby generating a clutter reduced image containing the one or more objects. The objects are compared with known images of a probable target until a match is found, the match representing the target identification.
20 Citations
35 Claims
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1-14. -14. (canceled)
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15. A system for processing an image comprising:
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first means for forming a density map of said image, wherein each pixel of said density map represents a density of bright pixels around a corresponding pixel in said image, and second means for applying a Watershed transform to said density map to identify boundaries of one or more objects in said image. - View Dependent Claims (16, 17, 18, 19, 20, 21, 29, 30, 31, 32, 33, 34)
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22. A method for processing an image for automatic target recognition comprising the steps of:
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forming a density map of said image, wherein each pixel of said density map represents a density of bright pixels around a corresponding pixel in said image, and applying a Watershed transform to said density map to identify boundaries of one or more objects in said image. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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35. A radar processing system comprising:
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an analog to digital converter for converting a plurality of radar returns into a digital stream; a computer for; converting said digital stream into a radar image; obtaining a density map of said image, wherein each pixel of said density map represents a density of bright pixels around a corresponding pixel in said image; applying a Watershed transform to said density map to identify a boundary of each object in said image; and replacing selected pixels in said image outside of the boundary of a selected object with noise to form a clutter reduced image; and an automatic target recognition system adapted to receive said clutter reduced image and identify said selected object.
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Specification