Image analysis – Image transformation or preprocessing – Changing the image coordinates
Patent
1993-09-07
1995-07-04
Couso, Jose L.
Image analysis
Image transformation or preprocessing
Changing the image coordinates
G06K 900
Patent
active
054308062
ABSTRACT:
A system for transforming a first 3-D image of a target scene obtained from reflected energy signals to create a second 3-D image from a different perspective. In an illustrative embodiment, the original image includes multiple data elements stored in addresses of a row-column array, where each data element comprises a range and an intensity value corresponding to a point in the target scene. Each data element may be addressed by selecting its row and column numbers. To create the new image, each data element's row-column address is first converted into a spherical coordinate. The spherical coordinate is then converted into a 3-D Cartesian coordinate, and the Cartesian coordinate is translated and rotated to achieve the new perspective. The translated, rotated, Cartesian coordinate is then converted back into a spherical coordinate, and then into row-column format. Then, the contents of each data element of the original array are stored in the new array, in the newly calculated address. A "hidden surface" algorithm may be employed to remove images corresponding to surfaces that are blocked or "hidden" when viewed from the new perspective. This is accomplished by filling unused addresses of the new array with range and intensity values calculated to match that of a background plane.
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Couso Jose L.
Loral Vought Systems Corporation
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