Method and apparatus for detection of parallel edges in image pr

Details Method and apparatus for detection of parallel edges in image pr Method and apparatus for detection of parallel edges in image pr

1990-12-17

1992-08-25

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 25, G06K 948

Patent

active

051425920

ABSTRACT:
A method and apparatus for detection of parallel edges in image processing systems is shown. A video source producing an image which is operated upon by Laplacian of Gaussian operator to produce an LOG image within which sign changes are detected to produce a zero crossing edge detected image. A vector gradient field of the LOG image is computed and subjected to a gradient field smoothing operation to produce a smoothed gradient field. The smoothed gradient field is examined to detect scaler minima within the field and the results thereof used to compute parallelism strength in accordance with preestablished criteria to generate a parallelism line image which is printed using a conventional printer.

REFERENCES:
patent: 4790026 (1988-12-01), Gennery et al.
patent: 4843630 (1989-06-01), Catros et al.
patent: 4958374 (1990-09-01), Tokita et al.
patent: 4987603 (1991-01-01), Ohnishi et al.
Mechanical Engineering, Ellen C. Hildreth, "Edge Detection for Computer Vision System", pp. 48-53, Aug. 1982.

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