METHOD AND APPARATUS FOR VECTOR CONVERSION OF DOCUMENT AND RECOGNITION OF SYMBOL

Title:

METHOD AND APPARATUS FOR VECTOR CONVERSION OF DOCUMENT AND RECOGNITION OF SYMBOL

Document Type and Number:

Japanese Patent JPS60574

Kind Code:

A

Abstract:

An apparatus codes a scanned document locally representing each graphic element within a prescribed mesure of accuracy by a trapezoidal approximation. The invention also includes a method for similarly coding a scanned document. The apparatus determines whether each scanned run is indicative of a Y- or λ-junction, the termination of an old, or the commencement of a new graphic element, and whether a new linear approximation is necessary. The invention is preferred embodiment recognizes symbols by determining the center of mass and maximum extremity of a symbol candidate, and comparing it to a reference library after normalizing with respect to scale, orientation and center of mass. in a preferred embodiment, an adaptive threshold parameter governs coding so as to reject noise and optimize a pair of linear predicters in a small number of scans. In a further preferred embodiment the accuracy of the linear predicters is refined so that the error is exponentially bounded.

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Inventors:

DEEBITSUDO ENU GUROOBAA
YUUJIN EI KUREKA
KAACHISU EI RITSUPUKII

Application Number:

JP4896184A

Publication Date:

January 05, 1985

Filing Date:

March 14, 1984

Export Citation:

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Assignee:

ANA TECH CORP

International Classes:

G06T3/00; G06T9/20; G06V10/20; G06V10/32; G06V10/40; H04N1/028; H04N1/41; H04N1/411; H04N1/417; (IPC1-7): G06F15/62; G06K9/36; G06K9/62

Attorney, Agent or Firm:

Kyozo Yuasa (6 people outside)

Next Patent: MAGNETIC INK CHARACTER READING DEVICE