Printed matter inspection method

Details Printed matter inspection method Printed matter inspection method

1992-09-03

1994-06-14

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 51, G06K 900

Patent

active

053217691

ABSTRACT:
It is possible to inspect a printed matter precisely because lines are surely and accurately extracted by the present invention. Extraction of lines are the important point for the judgment if a character is correctly printed or not. The printed matter inspection method according to the present invention comprises the following steps: i) an image of a predetermined area including a line is input; ii) a density projection is performed on said input image; iii) a start point and end point of change of density are emphasized in said density projection; iv) the center pixel in each predetermined convolution is substituted by the minimal density pixel in each said convolution; v) a density projection is performed; and vi) said printed matter defective or not is judged according to said density projection in v).

REFERENCES:
patent: 4251799 (1979-03-01), Jih
patent: 5204910 (1993-04-01), Lebeau
Rosenfeld et al., "Digital Picture Processing", Academic Press, Inc., Second Edition, vol. 2, pp. 215-217 (1982).

Affiliated with

Also associated with

Rating

Printed matter inspection 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 Printed matter inspection method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Printed matter inspection method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1255377