Intergraph Software Technologies Company

Intergraph Corporation

Integraph Software Technologies Company

Elaine S Acree

Gene Arthur Grindstaff

Sheila G Whitaker

A computer-implemented method for creating an image that depicts shadowing for a specified light source even though the input data is not three-dimensional and is limited to elevation data that associates an elevation value with each of a plurality of spatial coordinates. Plumb line walls are generated between elevation points of neighboring grid cells for each elevation point meeting a specified delta elevation criterion. A shadow map is accumulated based on visibility of each pixel to the light source position, and then, in a subsequent pass through the coordinate pixels of the data, an image is created in a tangible medium with each pixel correspondingly visible or shadowed, either totally or partially. Values along one dimension may be spread over a Z-buffer range to optimally resolve visibility features.

Method and apparatus for shadow estimation and spreading

A method of taking an aerial survey maps boundaries of a first image and a second image from a first plane to a second plane to determine boundaries of an output image in the second plane. For a plurality of pixels in the output image, the method determines a corresponding pixel of either the first image or second image in the first plane.

Method and apparatus of taking aerial surveys

A method of transforming an input image from a hemispherical source to an output image in rectilinear coordinates is disclosed. The method includes receiving data representative of an input image originating from a hemispherical camera and having a size defined by an input image height and an input image width. Once the data is received, an output image width and output image height representative of a size of a rectilinear output image is calculated based on the size of the input image. A rectilinear output image is then generated by mapping input image pixels to locations within the width and height of the output image, without reference to the optical characteristics of the hemispherical camera.

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Madison, AL, United States of America

Elaine S Acree