Object extraction in images

Details Object extraction in images Object extraction in images

1996-05-23

1999-07-13

Chang, Jon

Image analysis

Image segmentation

382270, G06K 946

Patent

active

059237767

ABSTRACT:
A method and apparatus for extracting an object from an image, in which one locates a pixel within the image (the "central" pixel), and then sequentially compares the brightness of neighboring pixels, proceeding outward from the central pixel. In so doing, one determines the largest dropoffs in brightness between neighboring pixels, and uses these to determine a brightness threshold for extracting pixels belonging to the object. In a preferred embodiment, one determines the threshold by comparing the largest dropoffs, identifies overlapping regions of brightness level common to all the dropoffs, and sets the threshold at the midpoint of the common overlapping region.

REFERENCES:
patent: 5072384 (1991-12-01), Doi et al.
patent: 5109436 (1992-04-01), Machida et al.
patent: 5583659 (1996-12-01), Lee et al.
Gregson. "Using Gradient Orientation for Edgel Detection." Proceedings, I Pacific Rim Conference on Communications, Computers and Signal Processing, pp. 293-296, Jun. 1989.
B. Kamgar-Parsi, Automatic Target Extraction in Infrared Images, 1995 NRL Review, pp. 143-46.
Memorandum dated Jun. 2, 1995 from Pat Staffieri to NRL "Code 1005" re distribution of document AA.

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