Generalized likelihood ratio test for dual band imagery
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorsBenjamin P. Wood, Jeffrey A. Wallace, Marc J. Fredette
Life of this patent
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Abstract
A passive sensor having a focal plane array with a plurality of pixels captures at least one dual band image. A generalized likelihood ratio test can be applied to the dual band imagery using intermediate images and image kernels or filters to approximate signal detections rather than performing a brute force approach. Further, the approach enables for the determination of detections in a plurality of sub-pixel locations.
Claims20
A method comprising:
- obtaining a dual band image from a passive image sensor having a focal plane array (FPA) carried by a platform, wherein the dual band image contains a detection;
- performing a generalize likelihood ratio test (GLRT) on the dual band image, wherein performing the GLRT is accomplished by defining a plurality of intermediate images and processing the intermediate images across the dual band image in parallel to obtain a signal intensity, wherein the signal intensity from the plurality of intermediate images are calculated in parallel and separate from each of the individual plurality of intermediate images such that the signal intensity values of the entire dual band image is calculated at one time;
- and
- determining whether the detection in the dual band image represents an object of interest based on the signal intensity that was obtained from performing operations for the intermediate images across the dual band image in parallel.
An object detection system comprising:
- a platform;
- a passive sensor having a focal plane array (FPA) comprising a plurality of pixels carried by the platform, wherein the passive sensor is configured to capture a dual band imager;
- GLRT logic configured to perform a generalize likelihood ratio test (GLRT) on the dual band image, wherein the GLRT logic is configured define a plurality of intermediate images, calculate a signal intensity from the plurality of intermediate images in parallel and separate from each of the individual plurality of intermediate images such that the signal intensity values of the entire dual band image is calculated at one time and execute operations for the intermediate images across the dual band image in parallel at one time;
- wherein the GLRT logic is responsive to executed operations for the intermediate images across the dual band image in parallel at one time to determine whether a detection that represents an object of interest is present in the dual band image.
A computer program product including at least one non-transitory computer readable storage medium having instructions encoded thereon that, when executed by one or more processors, implement a process determine whether a detection in a dual band image represents an object of interest, the process comprising:
- obtaining a dual band image from a passive image sensor having a focal plane array (FPA) carried by a platform;
- performing a generalize likelihood ratio test (GLRT) on the dual band image, wherein performing the GLRT is accomplished by defining a plurality of intermediate images and performing operations for the intermediate images across the dual band image in parallel at one time, said operations comprising calculating a signal intensity from the plurality of intermediate images in parallel and separate from each of the individual plurality of intermediate images such that the signal intensity values of the entire dual band image is calculated at one time;
- and
- determining whether the detection in the dual band image represents the object of interest in response to a result from performing operations for the intermediate images across the dual band image in parallel at one time.
Dependencies are inferred from the claim text.