Method and apparatus for extracting line segments from an image

Details Method and apparatus for extracting line segments from an image Method and apparatus for extracting line segments from an image

1993-03-17

1995-06-06

Couso, Jose L.

Image analysis

Image transformation or preprocessing

Changing the image coordinates

382296, G06K 932, G06K 936

Patent

active

054229626

ABSTRACT:
A method of extracting a line segment contained in an original image includes the steps of clipping an image, which conforms to the size of a receptive field defining a small area, from the original image, projecting the clipped receptive-field image from a predetermined projection direction onto an axis (.rho. axis) that intersects the projection direction to obtain projection values at positions along the .rho. axis, subjecting the projection values to differentiation processing along the .rho. axis, similarly subjecting projection values, which are obtained by successively varying a projection-direction angle .theta. incrementally a predetermined amount, to differentiation processing along the .rho. axis to thereby obtain a differential value at each position on a .rho.-.theta. plane, and extracting a line segment contained in the receptive-field image based upon a peak position (.rho.,.theta.) of the differential values.

REFERENCES:
patent: 4189775 (1980-02-01), Inouye et al.
patent: 5220615 (1993-06-01), Ishii et al.

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