Reduced-bias multi-resolution coherent change detection
First Claim
Patent Images
1. A computing device comprising:
- a processor; and
memory that comprises instructions that, when executed by the processor, cause the processor to perform acts comprising;
receiving a first synthetic aperture radar (SAR) image and a second SAR image for a scene, the first SAR image registered with the second SAR image, the first SAR image corresponds to a first time, the second SAR image corresponds to a second time;
generating a coherence change detection (CCD) image, wherein generating the CCD image comprises computing a sample correlation of a product of the first SAR image with a complex-conjugate of the second SAR image, wherein each pixel of the CCD image has a value that is computed using a box filter of a first size;
responsive to generating the CCD image, segmenting the CCD image into a plurality of segments, wherein the CCD image is segmented into the plurality of segments based upon the values of the pixels of the CCD image,identifying a plurality of box filter sizes for the plurality of segments of the CCD image such that each pixel of the CCD image is assigned a respective box filter size, wherein the plurality of box filter sizes are identified based upon the values of the pixels of the CCD image, andgenerating, a reduced bias multi-resolution (RBMR) CCD image, wherein generating the RBMR CCD image comprises computing the sample correlation of the product of the first SAR image with the complex-conjugate of the second SAR image, wherein each pixel of the RBMR CCD image has a value that is computed using the respective box titter size assigned to the pixel.
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Abstract
Described herein are various technologies relating to generating a reduced bias multi-resolution (RBMR) coherent change detection (CCD) image product. A low bias, low resolution (LBLR) CCD image product is generated based upon a first SAR image of a scene and a second SAR image of the scene, where each pixel in the LBLR CCD image has a respective value that is computed using a large box-filter. The LBLR CCD image is segmented into a plurality of segments, and a box-filter size is determined for each segment based upon values of pixels in the segment. A RBMR CCD image product is then computed using box-filters of the determined sizes.
9 Citations
10 Claims
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1. A computing device comprising:
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a processor; and memory that comprises instructions that, when executed by the processor, cause the processor to perform acts comprising; receiving a first synthetic aperture radar (SAR) image and a second SAR image for a scene, the first SAR image registered with the second SAR image, the first SAR image corresponds to a first time, the second SAR image corresponds to a second time; generating a coherence change detection (CCD) image, wherein generating the CCD image comprises computing a sample correlation of a product of the first SAR image with a complex-conjugate of the second SAR image, wherein each pixel of the CCD image has a value that is computed using a box filter of a first size; responsive to generating the CCD image, segmenting the CCD image into a plurality of segments, wherein the CCD image is segmented into the plurality of segments based upon the values of the pixels of the CCD image, identifying a plurality of box filter sizes for the plurality of segments of the CCD image such that each pixel of the CCD image is assigned a respective box filter size, wherein the plurality of box filter sizes are identified based upon the values of the pixels of the CCD image, and generating, a reduced bias multi-resolution (RBMR) CCD image, wherein generating the RBMR CCD image comprises computing the sample correlation of the product of the first SAR image with the complex-conjugate of the second SAR image, wherein each pixel of the RBMR CCD image has a value that is computed using the respective box titter size assigned to the pixel. - View Dependent Claims (2, 3, 4, 5)
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6. A method executed by a processor of a computing device, the method comprising:
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receiving a first synthetic aperture radar (SAR) image and a second SAR image for a scene, the first SAR image registered with the second SAR image, the first SAR image corresponds to a first time, the second SAR image corresponds to a second time; generating a coherence change detection (CCD) image, wherein generating the CCD image comprises computing a sample correlation of a product of the first SAR image with a complex-conjugate of the second SAR image, wherein each pixel of the CCD image has a value that is computed using a box filter of a first size; responsive to generating the CCD image, segmenting the CCD image into a plurality of segments, wherein the CCD image is segmented into the plurality of segments based upon the values of the pixels of the CCD image; identifying a plurality of box filter sizes for the plurality of segments of the CCD image such that each pixel of the CCD image is assigned a respective box filter size, wherein the plurality of box filter sizes are identified based upon the values of the pixels of the CCD image; and generating a reduced bias multi-resolution (RBMR) CCD image, wherein generating the RBMR CCD image comprises computing the sample correlation of the product of the first SAR image with the complex-conjugate of the second SAR image, wherein each pixel of the RBMR CCD image has a value that is computed using the respective box filter size assigned to the pixel. - View Dependent Claims (7, 8, 9, 10)
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Specification