METHOD OF BORESIGHT CORRELATION OF IMAGER VIDEO TO REFERENCE VIDEO
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Abstract
The present invention provides for simple and streamlined boresight correlation of FLIR-to-missile video. Boresight correlation is performed with un-NUCed missile video, which allows boresight correlation and NUC to be performed simultaneously thereby reducing the time required to acquire a target and fire the missile. The current approach uses the motion of the missile seeker for NUCing to produce spatial gradient filtering in the missile image by differencing images as the seeker moves. This compensates DC non-uniformities in the image. A FLIR image is processed with a matching displace and subtract spatial filter constructed based on the tracked scene motion. The FLIR image is resampled to match the missile image resolution, and the two images are preprocessed and correlated using conventional methods. Improved NUC is provided by cross-referencing multiple measurements of each area of the scene as viewed by different pixels in the imager. This approach is based on the simple yet novel premise that every pixel in the array that looks at the same thing should see the same thing. As a result, the NUC terms adapt to non-uniformities in the imager and not the scene.
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Citations
44 Claims
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1. -17. (canceled)
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18. A method of correlating video from an imager to reference video, comprising:
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using the temporal motion of the imager over a plurality of frames of video to form a first edge map; measuring scene motion of the video; spatially processing images in the reference video in accordance with the scene motion to locate at least some of the same edges to form a second edge map; and correlating the first and second edge maps to provide registration. - View Dependent Claims (19, 20, 21, 37, 38, 39, 40, 41)
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22. -36. (canceled)
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42. A method of correlating low-resolution video from an imager to high-resolution reference video, comprising:
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using the temporal motion of the imager over a plurality of frames of low-resolution video to delay and subtract successive frames to compensate the effects of DC non-uniformities in the frames and form a first edge map; estimating scene motion of the video; constructing a displace and subtract spatial filter based on the scene motion estimate; processing images in the high-resolution reference video with the displace and subtract filter to locate at least some of the same edges to form a second edge map; resampling the second edge map to match the resolution of the first edge map; correlating the first and second edge maps; and extracting registration information from the correlated first and second edge maps. - View Dependent Claims (43, 44)
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Specification