Apparatus which detects lines approximating an image by repeated

Details Apparatus which detects lines approximating an image by repeated Apparatus which detects lines approximating an image by repeated

1994-01-19

1996-09-10

Boudreau, Leo

Image analysis

Applications

Vehicle or traffic control

382291, G06K 900

Patent

active

055555551

ABSTRACT:
Each of feature points (Xs, Ys) in X and Y orthogonal coordinate system of an image taken by a television camera is converted into a group of points (.rho., .theta.) of polar coordinate system. Memory includes addresses allotted to each one of polar coordinates (.rho., .theta.) for storing frequency data. Each time the feature point is converted, the frequency data at addresses corresponding to the converted points (.rho., .theta.) is incremented. A particular point (.rho.m, .theta.m) where the stored frequency data is at maximum is picked out, and a rectilinear line corresponding to the particular point (.rho.m, .theta.m) is determined to be a rectilinear line which approxiates a succession of feature points (Xs, Ys). In this manner, a method of detecting a rectilinear line appearing on a photographed image is provided. This processing operation is repeated in a plurality of runs for the same succession of feature points. However, during the conversion into the polar coordinates of an earlier run, the conversion takes place at a low density and covers an increased range of values of .rho. and .theta. while during a later run, the conversion takes place at a higher density and in a narrowed range which is centered about the particular point (.rho.m, .theta.m) which was obtained during the conversion into the polar coordinates of the previous run.

REFERENCES:
patent: 4819169 (1989-04-01), Saitoh et al.
patent: 5087969 (1992-02-01), Kamada et al.
patent: 5220615 (1993-06-01), Ishii et al.
patent: 5247587 (1993-09-01), Hasegawa et al.
patent: 5341437 (1994-08-01), Nakayama
patent: 5359666 (1994-10-01), Nakayama et al.
patent: 5379353 (1995-01-01), Hasegawa et al.
Technical Research Report of the Association of Electronics and Communication, IE86-67, pp. 49-56, "A Fast Hough Transformation Using Pyramid Hieraarchy--Application to Extracton of Car Number Plates," Agui et al., (no date).

Affiliated with

Also associated with

Rating

Apparatus which detects lines approximating an image by repeated does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus which detects lines approximating an image by repeated, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus which detects lines approximating an image by repeated will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1330167