| CPC G06V 20/194 (2022.01) [G06N 3/08 (2013.01); G06V 10/58 (2022.01); G06V 10/60 (2022.01)] | 20 Claims |
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1. A method performed by a computing system for optically detecting a subject chemical species within an atmospheric environment, the method comprising:
obtaining image data representing multi spectral imagery of a geographic region captured through the atmospheric environment via an aeronautical vehicle,
the image data including an array of band-specific intensity values for each of a plurality of spectral bands, including a plurality of reference spectral bands and a sample spectral band having increased sensitivity to the subject chemical species as compared to the plurality of reference spectral bands;
removing albedo background from the image data for each of the plurality of spectral bands to obtain a normalized array of band-specific intensity values for each of the plurality of spectral bands;
generating a background reflectance map that includes an array of inter-band intensity values in which each inter-band intensity value represents a filtered combination of band-specific intensity values of the normalized arrays for a grouped subset of the plurality of reference spectral bands;
comparing the normalized array of band-specific intensity values for the sample spectral band to the background reflectance map to obtain an index array of intensity variance values; and
outputting the index array for the subject chemical species.
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