Image analysis – Image transformation or preprocessing – Walsh – hough – or hadamard transform
Patent
1998-01-13
2000-08-29
Couso, Yon J.
Image analysis
Image transformation or preprocessing
Walsh, hough, or hadamard transform
382199, 382103, G06K 936
Patent
active
061119938
ABSTRACT:
A straight-line detecting method for detecting a straight line in an image by using a combinatorial Hough transform at a high speed by restricting a voting area to assure detection of a short line segment without decreasing a processing rate, which method comprises the steps of: determining parameters of Hough transform of a straight line passing a remarkable edge point (x1, y1) and another edge point (x2, y2) in a X-Y plane according to the transform equations .theta.=-a tan{(x1-x2)/(y1-y2)} and .rho.=x1 cos .theta.+y1 sin .theta.; voting of pixels corresponding to parameters (.theta., .rho.); and detecting a straight line existing in the X-Y plane by the number of votes in a plane of .rho.-.theta. parameters and which is characterized in that another edge point (x2, y2) is a point existing in any of specified neighboring areas positioned at right and left and above and below from a center area where the remarkable edge point (x1, y1) is located.
REFERENCES:
patent: 5220621 (1993-06-01), Saitoh
patent: 5365600 (1994-11-01), Nagaishi
patent: 5430810 (1995-07-01), Saeki
patent: 5616905 (1997-04-01), Sugiyama
patent: 5629989 (1997-05-01), Osada
patent: 5638116 (1997-06-01), Shimoura et al.
patent: 5832138 (1998-11-01), Nakanishi et al.
Article entitled Navigation System Using Image Processing and Fuzzy Inference, pp. 407-416 (1991).
Couso Yon J.
Honda Giken Kogyo Kabushiki Kaisha
LandOfFree
Straight line detecting method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Straight line detecting method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Straight line detecting method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1257077