Freehand drawing containing invisible lines

Details Freehand drawing containing invisible lines Freehand drawing containing invisible lines

1985-12-12

1988-07-12

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 2, 382 13, 382 59, 178 18, 340706, G06K 900

Patent

active

047575492

ABSTRACT:
A computer based graphic editor has the capability of recognizing as a single graphic object a plurality of unconnected freehand strokes such as a signature. This makes possible editing a document with a signature, for example, without the various parts of the signature becoming separated and no longer being a viable entity. A cursor pointing device, such as a mouse with a button, is used to enter the plurality of unconnected strokes. Initially, the first point p.sub.1 at the beginning of a stroke which is the first stroke of a plurality of unconnected strokes is read and stored with the visible attribute. As long as the button is pressed, the position of the cursor is monitored and lines drawn from each successive point to the next point p.sub.2 with each point p.sub.2 being stored with the visible attribute. When the mouse button is released, the last read point position p.sub.2 is stored with the invisible attribute. When the mouse button is pressed again, the first point p.sub.1 of the next stroke is read and stored with the visible attribute, and the process repeated. When the mouse button is again pressed and released, the ending position of the previous stroke p.sub..0., the starting position of the current stroke p.sub.1 and the ending position of the current stroke p.sub.2 are compared and, if p.sub.1 and p.sub.2 are within a tolerance range and there exist no other points between p.sub.1 and p.sub.2 and if p.sub.1 and p.sub..0. are within the tolerance range, then the termination of the signature is detected.

REFERENCES:
patent: 4365235 (1982-12-01), Greanias et al.
patent: 4455451 (1984-06-01), Kriz
patent: 4495644 (1985-01-01), Parks et al.
patent: 4495646 (1985-01-01), Gharachorloo
patent: 4603231 (1986-07-01), Reiffel et al.
patent: 4628479 (1986-12-01), Borg et al.
Vocabulary of Data Processing, Telecommunications and Office Systems, Seventh Ed. IBM Co. 1981, pp. 26-27.
Personal Computer Hardware Reference Library, Rev. Edt., Jul. 1982, pp. 4-43 to 4-44.
Basis, IBM Co., Second Edt., May 1982, pp. 4-228 to 4-229 and 4-273 to 4-274.

Affiliated with

Also associated with

Rating

Freehand drawing containing invisible lines does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Freehand drawing containing invisible lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Freehand drawing containing invisible lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-669203