Imaging geometries for scanning optical detectors with overlapping fields of regard and methods for providing and utilizing same
Imaging devices and techniques that utilize multiple optical detectors are described and, in particular, imaging geometries for imaging devices that include three or more optical detectors with overlapping fields of regard. The imaging geometries are determined and provided in consideration of one or more performance criteria evaluated over multiple different operating conditions for a process of generating a reconstructed image from the captured images. Imaging systems and methods utilizing the imaging geometries are also described.
1. A method of improving the tolerance of an imaging device to scan rate and imaging geometry related errors, the method comprising:
for an imaging device that includes three or more imaging arrays configured to provide captured images, determining an imaging geometry for three or more imaging arrays in consideration of one or more performance criteria evaluated over a plurality of different operating conditions for a process of generating a reconstructed image from the captured images; and
arranging the three or more imaging arrays according to the imaging geometry;
wherein arranging the three or more imaging arrays includes one or more of establishing a geometrical placement of the imaging arrays and providing a virtual offset between the imaging arrays, the virtual offset including a virtual subpixel shift between the imaging arrays introduced by changes to the timing signals that control image capture.
2. The method of claim 1 , wherein the reconstructed image is higher in resolution than the captured images.
3. The method of claim 1 , wherein determining the imaging geometry includes determining a spacing of the imaging arrays.
4. The method of claim 1 , wherein the one or more performance criteria include the robustness of the process of generating a reconstructed image from the captured images.
5. The method of claim 1 , wherein the plurality of different operating conditions include a range of off-nominal operating conditions.
6. The method of claim 1 , wherein the plurality of different operating conditions include one or more conditions under which image drift tends to cause columns of the imaging arrays to overlap rather than interlace during collection.
7. The method of claim 1 , wherein the plurality of different operating conditions include one or more conditions under which image drift tends to cause a degradation of a resolution gain provided by a simple stagger pattern of arrays.
8. The method of claim 1 , wherein at least one of the operating conditions tends to cause cross-scan sub-pixel shift vectors of the imaging arrays to overlap.
9. An imaging method comprising:
for an imaging device that includes three or more imaging arrays configured to provide captured images, where overlap of the imaging arrays can be observed and controlled in real time in at least one dimension;
providing an imaging geometry for the three or more imaging arrays in consideration of one or more performance criteria;
generating a reconstructed image from the captured images;
selecting an order of observed sub-pixel cross-scan displacements;
adjusting the timing phase of the imaging arrays to adjust along-scan sub-pixel displacements; and
generating the reconstructed image by interlacing pixels in the order selected.
10. The imaging method of claim 9 , wherein generating the reconstructed image includes super-resolution processing in two dimensions.
11. The imaging method of claim 9 , wherein the imaging geometry is arranged in consideration of one or more performance criteria evaluated over a plurality of different operating conditions for the process of generating a reconstructed image from the captured images.
12. The imaging method of claim 11 , wherein the one or more performance criteria include the robustness of the process of generating a reconstructed image from the captured images.
13. The imaging method of claim 11 , wherein the plurality of different operating conditions include a range of off-nominal operating conditions.
14. The imaging method of claim 11 , wherein the plurality of different operating conditions include one or more conditions under which image drift tends to cause columns of the imaging arrays to overlap rather than interlace during collection.
15. The imaging method of claim 11 , wherein the plurality of different operating conditions include one or more conditions under which image drift tends to cause a degradation of a resolution gain provided by a simple stagger pattern of arrays.
16. The imaging method of claim 11 , wherein at least one of the operating conditions tends to cause cross-scan sub-pixel shift vectors of the imaging arrays to ove