Enhanced bundle adjustment techniques
First Claim
Patent Images
1. A method, comprising:
- observing, with a position measurement device, a position of a first target point non-photographically, with respect to a local or global coordinate system;
observing, with the position measurement device, a position of a second target point non-photographically, with respect to the local or global coordinate system;
capturing, with an imaging device, the first and second target points in one or more images observed from one or more stations;
correlating, with a computer, the observed position of the first target point with a pixel coordinate location of the first target point in each of the one or more images;
correlating, with the computer, the observed position of the second target point with a pixel coordinate location of the second target point in each of the one or more images;
performing, with the computer, a bundle adjustment calculation to orient a mosaic of images comprising the one or more images, wherein performing the bundle adjustment calculation comprises performing a photo-observable backsight by constraining the pixel coordinate location of the first target point in the oriented mosaic of images to the observed position of the first target point with respect to the local or global coordinate system to within a specified precision; and
performing, with the computer, a photo-observable check shot by comparing a location of the second target point in the oriented mosaic of images with the observed position of the second target point with respect to the local or global coordinate system, to ensure that the oriented mosaic of images corresponds to the local or global coordinate system to within a specified precision.
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Abstract
Novel tools and techniques that can be used to enhance the effectiveness of photogrammetric tools, such as bundle adjustment. One set of techniques can include a photo-observable backsight operation, in which a position of target point can be observed non-photographically, and this observed position can be used to constrain a pixel coordinate location of the same target point in a bundle adjustment operation. Using another technique, a photo-observable check shot operation, the observed position of another target point can be used to verify the validity of a bundle adjustment calculation. Such techniques can be used together or separately.
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Citations
19 Claims
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1. A method, comprising:
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observing, with a position measurement device, a position of a first target point non-photographically, with respect to a local or global coordinate system; observing, with the position measurement device, a position of a second target point non-photographically, with respect to the local or global coordinate system; capturing, with an imaging device, the first and second target points in one or more images observed from one or more stations; correlating, with a computer, the observed position of the first target point with a pixel coordinate location of the first target point in each of the one or more images; correlating, with the computer, the observed position of the second target point with a pixel coordinate location of the second target point in each of the one or more images; performing, with the computer, a bundle adjustment calculation to orient a mosaic of images comprising the one or more images, wherein performing the bundle adjustment calculation comprises performing a photo-observable backsight by constraining the pixel coordinate location of the first target point in the oriented mosaic of images to the observed position of the first target point with respect to the local or global coordinate system to within a specified precision; and performing, with the computer, a photo-observable check shot by comparing a location of the second target point in the oriented mosaic of images with the observed position of the second target point with respect to the local or global coordinate system, to ensure that the oriented mosaic of images corresponds to the local or global coordinate system to within a specified precision.
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2. A system, comprising:
a computer comprising a processor and a non-transitory computer readable medium having stored thereon a set of instructions executable by the processor to perform one or more operations, the set of instructions comprising; instructions to receive data indicating an observed position of a target point, with respect to a local or global coordinate system; instructions to receive a plurality of images comprising one or more images that include the target point; instructions to correlate the observed position of the target point with a location of the target point in each of the one or more images; and instructions to use a correlation of the observed position of the target point with the location of the target point in each of the one or more images to perform a bundle adjustment calculation that orients a mosaic of images comprising the plurality of images, wherein using a correlation of the observed position of the target point with the location of the target point in each of the one or more images comprises performing a photo-observable backsight by constraining the location of the target point in the oriented mosaic of images to the observed position of the target point with respect to the local or global coordinate system to within a specified precision. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus, comprising:
a non-transitory computer readable medium having encoded thereon a set of instructions executable by one or more computers to perform one or more operations, the set of instructions comprising; instructions to receive, from a position measurement device, data indicating an observed position of a target point; instructions to receive a plurality of images comprising one or more images that include a photographic observation of the target point; instructions to correlate the observed position of the target point with a location of the target point in each of the one or more images; and instructions to use a correlation of the observed position of the target point with the location of the target point in each of the one or more images to perform a bundle adjustment calculation that orients a mosaic of images comprising the plurality of images, wherein using a correlation of the observed position of the target point with the location of the target point in each of the one or more images comprises performing a photo-observable backsight by constraining a pixel coordinate location of the target point in the oriented mosaic of images to the observed position of the target point with respect to the local or global coordinate system to within a specified precision.
Specification