Image analysis – Histogram processing – For setting a threshold
Patent
1991-03-04
1992-04-28
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 50, 382 52, 358105, 358125, G06K 938, G06K 920, H04N 718, H04N 5225
Patent
active
051094355
ABSTRACT:
Three image frames containing an object of interest and background clutter are taken at successive time intervals and stored in memory. The background of images A, B and C are registered preferably using an area correlator 12. A median filter 16 is used to select a median value from the registered image frames. Then, subtractor 18 serves to subtract the median pixel values from one of the image frames. This difference output is then thresholded to provide a binary signal whose pixel values exceeding the threshold levels are generally associated with the position of the moving object.
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Banh Nam D.
Lo Thomas K.
Sacks Jack M.
Boudreau Leo H.
Brown C. D.
Cammarata Michael R.
Denson-Low W. K.
Heald R. M.
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