Image analysis – Histogram processing – For setting a threshold
Patent
1991-02-07
1993-11-02
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 45, 364456, 364458, 358103, G06K 900, G01C 2100
Patent
active
052590372
ABSTRACT:
A method for converting forward looking video or motion picture imagery into a downlooking database suitable for use in an image generation system to generate realtime perspective images for simulation purposes. A digital video camera photographs a sequence of forward looking frames along a course including several known ground control points. Digital data from the digital video camera is read into a computer. The initial position and the position of ground control points is read into the computer. A Kalman filter technique provides continuous estimates of exact camera location in x, y, z coordinates, and in roll, pitch and yaw orientation. A correlation filter determines corresponding pixels in adjacent frames. Range from the camera to the pixel surfaces is calculated to determine the x, y and z position thereof. A modified mathematical stereophotogrammetry technique is used. Radiometric data and elevation data is extracted from the lower portion of the frame for each pixel. After the radiometric and elevation data have been established for each pixel in each frame, the imagery is warped onto the elevation data to generate a top down view. The database is then ready for use in an image generation system.
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patent: 4695959 (1987-09-01), Lees et al.
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patent: 4984279 (1991-01-01), Kidney et al.
patent: 4988189 (1991-01-01), Kroupa et al.
Merchant, "Exact Area Registration of Different Views of a Common Object Scene," Optical Engineering, vol. 20, No. 3, May/Jun. 1981, pp. 424-436.
Boudreau Leo H.
Denson-Low Wanda K.
Hughes Training, Inc.
Johns Andrew W.
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