Image analysis – Histogram processing – For setting a threshold
Patent
1994-03-11
1996-02-20
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
367 88, 367131, 382 22, 382 54, G06K 900
Patent
active
054936195
ABSTRACT:
A method for eliminating false detections at the water column boundary in side scan sonar images is provided. Each image is filtered by computing the median greylevel value of a pixel and its four adjacent pixels to produce a median image. The median image is filtered with a first linear filter to produce an edge image. The edge image is then filtered with a second linear filter to produce an edge-smoothed image. The edge of the image is detected by searching each row of the edge-smoothed image for the maximum greylevel. A transition region is defined between the detected edge and a preselected right boundary and the average greylevels over the rows and columns in this transition region is computed. The sonar image is then normalized by computing the image mean grayness level of each pixel in the image.
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Gilmour John E.
Haley Paul H.
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