Signal processing for autonomous acquisition of objects in...

Details Signal processing for autonomous acquisition of objects in... Signal processing for autonomous acquisition of objects in...

G - Physics

01

S

350/32, 354/46

G01S 3/786 (2006.01) G06T 7/20 (2006.01)

Patent

CA 1313704

SIGNAL PROCESSING FOR AUTONOMOUS ACQUISITION OF OBJECTS IN CLUTTERED BACKGROUND ABSTRACT OF THE DISCLOSURE A method and apparatus are disclosed for detecting moving objects silhouetted against background clutter. A correlation subsystem 12 is used to register the background of a current image frame (framestore 1) with an image frame taken two time periods earlier (framestore 3). A first difference image is generated by subtracting the registered images, with the first difference image being filtered by low pass filter 34 and thresholded by a three level segmenter 36. A second difference image is likewise generated between the current image frame and another image frame taken at a different subsequent time period. This second difference image is likewise filtered and thresholded. The two difference images are logically ANDed together by gate 39 whose output is connected to a formatter, sorter and feature extractor 40. Track files are generated in CPU 16 for comparing subsequently extracted image features with previously stored extracted features.

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