Estimating gas quantity in a pixel based on spectral matched filtering
AssigneeMaxar Technologies Holdings Inc.
InventorsJoseph Christy, Andreas Hayden
Life of this patent
Estimating the term…
Abstract
Gas quantity in a pixel may be estimated based on spectral matched filtering. Image data associated with a scene may be received. The scene may comprise a plurality of pixels. Next, a spectral matched filter may be constructed for a predetermined gas and based on the image data. A quantity of the predetermined gas may then be estimated in at least one of the plurality of pixels by applying the spectral matched filter to the image data.
Claims20
A method comprising:
- receiving image data associated with a scene, wherein the scene comprises a plurality of pixels;
- constructing a spectral matched filter for a predetermined gas based on a scene average spectrum L and a scene spectral covariance C from the image data;
- and
- estimating a quantity of the predetermined gas in at least one of the plurality of pixels by applying the spectral matched filter to the image data,
- wherein the spectral matched filter f comprises:
- f
- =
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
-
- C
- -
- 1
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
-
- C
- -
- 1
- [
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
- ]
- T
- ;
- and
- wherein α is a spectral absorption of the gas and L↑ is atmospheric scattered light in the scene.
A system comprising:
- a memory storage;
- and
- a processing unit coupled to the memory storage, wherein the processing unit is operative to:
- receive image data associated with a scene, wherein the scene comprises a plurality of pixels;
- construct a spectral matched filter for a predetermined gas based on a scene average spectrum L and a scene spectral covariance C from the image data;
- and
- estimate a quantity of the predetermined gas in at least one of the plurality of pixels by applying the spectral matched filter to the image data,
- wherein the spectral matched filter f comprises:
- f
- =
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
-
- C
- -
- 1
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
-
- C
- -
- 1
- [
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
- ]
- T
- ;
- and
- wherein α is a spectral absorption of the gas and L↑ is atmospheric scattered light in the scene.
A non-transitory computer-readable medium that stores a set of instructions which, when executed, perform a method comprising:
- receiving image data associated with a scene, wherein the scene comprises a plurality of pixels;
- constructing a spectral matched filter for a predetermined gas based on a scene average spectrum L and a scene spectral covariance C from the image data;
- and
- estimating a quantity of the predetermined gas in at least one of the plurality of pixels by applying the spectral matched filter to the image data,
- wherein the spectral matched filter f comprises:
- f
- =
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
-
- C
- -
- 1
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
-
- C
- -
- 1
- [
- α
-
- (
- L
- ¯
- -
- L
- ↑
- )
- ]
- T
- ;
- and
- wherein α is a spectral absorption of the gas and L↑ is atmospheric scattered light in the scene.
Dependencies are inferred from the claim text.