Image analysis – Image transformation or preprocessing – Changing the image coordinates
Patent
1996-11-15
2000-07-04
Bella, Matthew C.
Image analysis
Image transformation or preprocessing
Changing the image coordinates
382103, 382106, 382108, 382109, 382181, 382190, 382199, 382201, 382203, 382204, 382209, 382213, 382217, 382295, 382298, 382299, 348144, 364456, G06K 932
Patent
active
060849894
ABSTRACT:
A system and method for determining offset errors between line and pixel coordinates of landmarks in a digitized image generated by an imaging system disposed on a spacecraft and line and pixel coordinates predicted by a mathematical model of the imaging system using landmark geodetic coordinates on the Earth. The system and method use landmarks in symbolic form, such as perimeters of lakes and islands that are stored in a database. A digitized image generated by the satellite-based imaging system is processed to extract a patch of the image containing a landmark. The image patch is then upsampled (magnified). The landmark boundary is processed using a mathematical model of the imaging system to generate absolute coordinates of the boundary pixels, which are upsampled and rasterized to produce a landmark mask. The landmark mask and the upsampled image patch are then processed by one or more matching algorithms to generate line and pixel offset error values indicative of the offset between the predicted position of the landmark and the actual position of the landmark in the image. A match figure of merit is also generated that is indicative of the reliability and accuracy of the computed offset. Optionally, the upsampled image patch is processed using an image enhancement algorithm that increases the contrast and robustness of the images by converting pixel gray scale values into likelihood ratios.
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Bella Matthew C.
Chawan Sheela
Float Kenneth W.
Lockheed Martin Corporation
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