Image analysis – Histogram processing – For setting a threshold
Patent
1992-06-05
1994-09-27
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 22, 382 54, 36441313, G06K 940
Patent
active
053513053
ABSTRACT:
A magnetic resonance imaging system (A) generates an image (16) of a slice or other region of an examined subject. A smoothing filter (B) smooths the generated image to create a smoothed or filtered image representation (30). The filtering of the image, unfortunately, tends to smooth or blur the edges. An edge detecting means (C.sub.1) views the region around each sampled pixel of the filtered image to determine an amount of deviation in the pixel values. A large deviation indicates an edge; whereas, substantial homogeneity indicates the lack of an edge. Analogously, the direction of the maximum deviation is orthogonal to the direction of the edge. A plurality of soft edge directional filters (54) operate on the filtered image data to create a plurality of soft edge directionally filtered image representations (62). A plurality of hard edge directional filters (56) operate on the filtered image data to create a plurality of hard edge directionally filtered image representations (64). Preferably, the directional filtering is done at regular angular increments, e.g. every ten degrees. An edge enhanced final image representation (72) is created in which filtered pixels not adjacent an edge are assembled directly from the filtered image (30). Pixels which are adjacent an edge with a smaller (larger) rate of deviation are replaced by the corresponding pixel of the soft (hard) edge filtered image representation that was directionally filtered along a direction most nearly parallel to the determined edge direction.
REFERENCES:
patent: 4499493 (1985-02-01), Nishimura
patent: 4503461 (1985-03-01), Nishimura
patent: 4691366 (1987-09-01), Fenster et al.
patent: 4761819 (1988-08-01), Denison et al.
patent: 4834964 (1989-05-01), Rosen
patent: 4851678 (1989-07-01), Adachi et al.
patent: 4972256 (1990-11-01), Hirosawa et al.
patent: 4991092 (1991-02-01), Greensite
patent: 5001429 (1991-03-01), Constable et al.
patent: 5031227 (1991-07-01), Raasch et al.
patent: 5050227 (1991-09-01), Furusawa et al.
patent: 5063607 (1991-11-01), FitzHenry et al.
patent: 5072314 (1991-12-01), Chang
patent: 5078141 (1992-01-01), Suzuki et al.
patent: 5081692 (1992-01-01), Kwon et al.
patent: 5115476 (1992-05-01), Ito
patent: 5157741 (1992-10-01), Katayama
patent: 5218649 (1993-06-01), Kundo et al.
Digital Picture Processing, Rosenfeld, et al. Second Edition, vol. 1, 1982 Academic Press, Inc. pp. 245-267.
Adaptive Smoothing: A General Tool for Early Vision, Saint-Marc, et al. IEEE vol. 13, No. 6, Jun. 1991, pp. 514-529.
Apicella Anthony
Hajjar Fares
Matthews Kevin E.
Wood Christopher H.
Boudreau Leo H.
Kelley Christopher S.
Picker International Inc.
LandOfFree
Concurrent smoothing and edge enhancement of medical diagnostic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Concurrent smoothing and edge enhancement of medical diagnostic , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Concurrent smoothing and edge enhancement of medical diagnostic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1270694