Mosaic oblique images and methods of making and using same
First Claim
1. A method for creating an oblique-mosaic image from a plurality of source oblique images, comprising the steps of:
- identifying a desired geographical area to be imaged and collected into an oblique-mosaic image;
creating a mathematical model of a virtual camera having a sensor higher in elevation from which the source oblique images were captured and looking down at an oblique angle, the mathematical model having an oblique-mosaic pixel map for the sensor of the desired area encompassing multiple source images, wherein the virtual camera includes the parameters of a focal point, a focal length, and a size of a focal plane;
assigning a geographic coordinate to each pixel included in the oblique mosaic pixel map;
selecting source oblique images of the geographic coordinates captured at an oblique angle and compass direction similar to the oblique angle and compass direction of the virtual camera; and
reprojecting, using a mathematical elevation model to define a ground surface within the desired geographical area, at least one source oblique image pixel of selected source oblique images of the area to be imaged from the vantage point of the sensor of the virtual camera for each pixel included in the oblique-mosaic pixel map in a fan-like pattern from the focal point of the virtual camera to thereby create a geo-referenced oblique-mosaic image of the desired geographical area.
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Abstract
A method for creating an oblique-mosaic image from a plurality of source images is disclosed. Initially, a desired area to be imaged and collected into an oblique-mosaic image is identified and then a mathematical model of a sensor of a virtual camera is created, where the virtual camera has an elevation greater than an elevation of the area to be imaged. The mathematical model has an oblique-mosaic pixel map for the sensor of the desired area. A surface location is determined for each pixel included in the oblique mosaic pixel map, and at least one source oblique image pixel of the area to be imaged is reprojected for each pixel included in the oblique-mosaic pixel map to thereby create an oblique-mosaic image of the desired geographical area. The at least one single oblique-mosaic image is visually pleasing and geographically accurate. Further, techniques for compensating for building lean in oblique-mosaic images are disclosed.
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Citations
20 Claims
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1. A method for creating an oblique-mosaic image from a plurality of source oblique images, comprising the steps of:
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identifying a desired geographical area to be imaged and collected into an oblique-mosaic image; creating a mathematical model of a virtual camera having a sensor higher in elevation from which the source oblique images were captured and looking down at an oblique angle, the mathematical model having an oblique-mosaic pixel map for the sensor of the desired area encompassing multiple source images, wherein the virtual camera includes the parameters of a focal point, a focal length, and a size of a focal plane; assigning a geographic coordinate to each pixel included in the oblique mosaic pixel map; selecting source oblique images of the geographic coordinates captured at an oblique angle and compass direction similar to the oblique angle and compass direction of the virtual camera; and reprojecting, using a mathematical elevation model to define a ground surface within the desired geographical area, at least one source oblique image pixel of selected source oblique images of the area to be imaged from the vantage point of the sensor of the virtual camera for each pixel included in the oblique-mosaic pixel map in a fan-like pattern from the focal point of the virtual camera to thereby create a geo-referenced oblique-mosaic image of the desired geographical area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for creating an oblique-mosaic image from a plurality of source oblique images, comprising the steps of:
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identifying a desired geographical area to be imaged and collected into an oblique-mosaic image; creating a mathematical model of a virtual camera having a sensor, where the virtual camera has an elevation greater than an elevation from which the source oblique images were captured and looking down at an oblique angle, the mathematical model having an oblique-mosaic pixel map for the sensor of the desired area encompassing multiple source oblique images, wherein the virtual camera includes the parameters of a focal point, a focal length, and a size of a focal plane; determining a geographic coordinate for each pixel included in the oblique mosaic pixel map; selecting source oblique images of the geographic coordinates captured at an oblique angle and compass direction similar to the oblique angle and compass direction of the virtual camera; and reprojecting, using a mathematical elevation model to define a ground surface within the desired geographical area, at least one source oblique image pixel of selected source oblique images of the area to be imaged from the vantage point of the sensor of the virtual camera for each pixel included in the oblique-mosaic pixel map in a fan-like pattern from the focal point of the virtual camera to thereby create a geo-referenced oblique-mosaic image of the desired geographical area. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification