Remote identification of non-lambertian materials

摘要

In one example of a method for remote identifying a non-Lambertian target material, a spectral signature for a target is determined from each of at least two different sets of imagery acquired at different angles, and compared to a predicted signature for a candidate material for each of the at least two different angles. The predicted signatures take into account the known anisotropy of reflectance, and thus also radiance, of the candidate material.

主权项

1. A method performed by processing circuitry and memory configured for determining if a physical target is formed from a candidate material, comprising:
receiving a first image of the physical target acquire first acquisition angle; delineating the physical target within the first image as a first area; extracting a first spectral radiance value from the first area; receiving a second image of the physical target acquired at a second acquisition angle different from the first acquisition angle; delineating the physical target within the second image as a second area; extracting a second spectral radiance value from the second area; evaluating an estimated target spectral signature for the physical target based at least in part on the first and second spectral radiance values; calculating a predicted candidate spectral signature for the candidate material based at least in part on the first and second acquisition angles; calculating a correlation statistic that correlates the predicted candidate spectral signature to the estimate target spectral signature; comparing the correlation statistic to a predetermined probability threshold; and determining from the comparison that the physical target is formed from the candidate material.