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US 12,614,291 B2Granted
Coregistration of ground penetrating radar images
AssigneesLawrence Livermore National Security, LLC, Teres Technologies, Inc.
InventorsDavid Chambers, Jeffrey Edward Mast
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Abstract
A method of coregistering images is disclosed. Two dimensional images are first preprocessed, including clipping values in each image to a specified standard value range, and then applying a local equalization technique to the clipped images. Feature extraction is then performed to identify one or more features in the images. One or more of the extracted features are then matched between images to determine a degree of overlap between the images and a relationship between image coordinates of the images. The images are then transformed to a common coordinate system based on the degree of overlap and the relationship between their image coordinates. The images are then combined to form a single image.
Claims30
A method comprising:
- accessing a first plurality of images;
- and
- applying a coregistration process to a second plurality of images in the first plurality of images, the coregistration process including:
- converting the second plurality of images to a specified standard form, by:
- for each image of the second plurality of images, computing a mean and a variance of pixel values in the image;
- and
- for each pixel value in each image of the second plurality of images, subtracting the mean computed for that image from each pixel value in the image to produce an intermediate pixel value, and dividing each intermediate pixel value by a square root of the variance computed for that image to produce a standardized pixel value;
- preprocessing the second plurality of images, wherein the preprocessing includes clipping values in each image of the second plurality of images to a
- specified standard value range, to produce a plurality of clipped images;
- and applying a local equalization technique to the plurality of clipped images;
- performing a feature extraction to identify a feature in each image of the plurality of clipped images;
- matching the feature between each image of the plurality of clipped images, to determine a degree of overlap between the images in the second plurality of images and a relationship between image coordinates of the images in the second plurality of images;
- transforming the second plurality of images to a common coordinate system based on the degree of overlap and the relationship between the image coordinates of the second plurality of images;
- and
- combining the second plurality of images to form a single image.
12 more elements
A computer system comprising:
- one or more processor;
- and
- one or more memories coupled to the one or more processors and storing instructions, execution of which by the one or more processors causes the computer system to:
- access a first plurality of images acquired by a ground penetrating radar (GPR) system;
- and
- apply a coregistration process to a second plurality of images in the first plurality of images, the coregistration process including:
- preprocessing the second plurality of images, wherein the preprocessing includes
- converting the second plurality of images to a specified standard form, by:
- for each image of the second plurality of images, computing a mean and a variance of pixel values in the image;
- and
- for each pixel value in each image of the second plurality of images, subtracting the mean computed for that image from each pixel value in the image to produce an intermediate pixel value, and dividing each intermediate pixel value by a square root of the variance computed for that image to produce a standardized pixel value;
- clipping values in each image of the second plurality of images to a specified standard value range, to produce a plurality of clipped images;
- and
- applying a local equalization technique to the plurality of clipped images;
- performing a feature extraction to identify a feature in each image of the plurality of clipped images;
- matching the feature between each image of the plurality of clipped images, to determine a degree of overlap between the images in the second plurality of images and a relationship between image coordinates of the images in the second plurality of images;
- transforming the second plurality of images to a common coordinate system based on the degree of overlap and the relationship between the image coordinates of the second plurality of images;
- and
- combining the second plurality of images to form a single image.
16 more elements
A non-transitory machine-readable storage medium storing instructions, execution of which by one or more processors in a processing system causes the processing system to perform a process comprising:
- accessing a first plurality of images acquired by a ground penetrating radar (GPR) system;
- and
- applying a coregistration process to a second plurality of images in the first plurality of images, the coregistration process including:
- converting the second plurality of images to a specified standard form, by:
- for each image of the second plurality of images, computing a mean and a variance of pixel values in the image;
- and
- for each pixel value in each image of the second plurality of images, subtracting the mean computed for that image from each pixel value in the image to produce an intermediate pixel value, and dividing each intermediate pixel value by a square root of the variance computed for that image to produce a standardized pixel value;
- preprocessing the second plurality of images, wherein the preprocessing includes clipping values in each image of the second plurality of images to a
- specified standard value range, to produce a plurality of clipped images;
- and applying a local equalization technique to the plurality of clipped images;
- performing a feature extraction to identify a feature in each image of the plurality of clipped images;
- matching the feature between each image of the plurality of clipped images, to determine a degree of overlap between the images in the second plurality of images and a relationship between image coordinates of the images in the second plurality of images;
- transforming the second plurality of images to a common coordinate system based on the degree of overlap and the relationship between the image coordinates of the second plurality of images;
- and
- combining the second plurality of images to form a single image.
12 more elements
Dependencies are inferred from the claim text.