Technique for ship/wake detection
| DWPI Title: Computer-readable storage medium for performing automated daytime ship/wake detection in seas using satellite camera, has set of instructions to threshold spatial variability image to identify regions in image as ship detection regions |
| Abstract: An automated ship detection technique includes accessing data associated with an image of a portion of Earth. The data includes reflectance values. A first portion of pixels within the image are masked with a cloud and land mask based on spectral flatness of the reflectance values associated with the pixels. A given pixel selected from the first portion of pixels is unmasked when a threshold number of localized pixels surrounding the given pixel are not masked by the cloud and land mask. A spatial variability image is generated based on spatial derivatives of the reflectance values of the pixels which remain unmasked by the cloud and land mask. The spatial variability image is thresholded to identify one or more regions within the image as possible ship detection regions. |
| Use: Computer-readable storage medium for performing automated daytime ship/wake detection in water using an imager such as satellite camera, aerial camera, and high altitude land mounted camera. Uses include but are not limited to open-ocean, lakes, rivers and seas. |
| Advantage: The medium enables performing automated daytime ship/wake detection in water, so that the large swaths of water can be monitored in real-time and labor intensity is reduced. |
| Novelty: The medium has a set of instructions to access data related to a raw image (100) of a portion of Earth. A portion of pixels in the image is masked with a cloud and land mask based on spectral flatness of reflectance values of data. One of the pixels is unmasked when a threshold number of localized pixels surrounding the pixel are not masked by the cloud and land mask. A spatial variability image is generated based on spatial derivatives of reflectance values of the unmasked pixels. The spatial variability image is thresholded to identify regions in the image as possible ship detection regions. |
| Filed: 9/17/2009 |
| Application Number: US2009561282A |
| Tech ID: SD 10265.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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