Communications – electrical: acoustic wave systems and devices – Acoustic image conversion
Patent
1991-10-10
1992-10-13
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Acoustic image conversion
367 88, 367 11, G01S 1500
Patent
active
051557061
ABSTRACT:
A method of locating objects in sonar images so that matching algorithms can be used to determine if the same objects appear in two images. Information from the matching algorithms can then be used to upgrade the position of the vehicle and objects recorded in the vehicle's navigation system. Images are improved by normalizing brightness and contrast and then convolving the image with at least one filter. The image is normalized by dividing the image into vertical strips, creating a histogram to represent the grayness values for columns of pixels in each strip and applying an algorithm to each strip to change its grayness value.
REFERENCES:
patent: 4868651 (1989-09-01), Chou et al.
patent: 4941164 (1990-07-01), Schuller et al.
Phillip F. Schweizer and Walter J. Petlevich, "Automatic Target Detection and Cuing System for an Autonomous Underwater Vehicle (AUV)", Proceeding of Sixth Symposium on Unmanned, Untethered Submersibles, Oct. 1989.
Sanjay Ranade and Azriel Rosenfeld, "Point Pattern Matching by Relaxation", Patten Recognition, vol. 12, pp. 269-275 (Rergamon Press Ltd. 1980).
Haley Paul H.
Oravec James J.
Pihulic Daniel T.
Schron D.
Westinghouse Electric Corp.
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