Optical character reading system

• US 4,355,301 A
• Filed: 05/27/1980
• Issued: 10/19/1982
• Est. Priority Date: 05/27/1980
• Status: Expired due to Term

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Sato, Koji, Tanaka, Masatoshi, Isshiki, Isao, Sakamoto, Fukuma, Ohoka, Akihiro
• Primary Examiner(s): Boudreau, Leo H.
• Application Number:
  US06/153,222
• Time in Patent Office: 875 Days
• Field of Search: 340/146.3 ED, 340/146.3 AC, 340/146.3 AQ, 340/146.3 Q, 340/146.3 D, 340/146.3 F, 340/146.3 MA, 340/146.3 SY, 235/462, 235/472, 358/285, 250/567
• US Class Current: 382/196
• CPC Class Codes: G06V 10/20 Image preprocessing
• CPC Class Codes: G06V 10/421 by analysing segments intersecting the pattern
• CPC Class Codes: G06V 10/75 Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video features; Coarse-fine approaches, e.g. multi-scale approaches; using context analysis; Selection of dictionaries

Abstract

An optical character reading system in which each character pattern is electronically scanned several times while a manually held scanner is moved over the character pattern. The recognition results from each scan are subjected to a selection process and a final signal recognition result is generated in which noise and inaccurate recognition results have been substantially eliminated. Data from a character scanner is classified into several different data types from which partial characteristics are determined. Signals representing the partial characteristics operate a memory circuit which produces the final recognition signal.

Claims

1. An optical character reading system comprising:

means for optically scanning a two-dimensional character pattern by a single sensor in a single sweep of said sensor past said character pattern for optically recognizing said character pattern at a plurality of different relative positions between said single sensor and said character pattern to provide a plurality of recognition results; and

means for subjecting said plurality of recognition results to selection to provide a final single recognition result of said character pattern.

2. The optical character reading system of claim 1 wherein said means for subjecting said plurality of recognition results to selection comprises means for providing said final single recognition result as the character most frequently recognized along a predetermined number of character output signals.

3. The optical character reading system of claim 1 wherein said means for subjecting said plurality of recognition results to selection comprises means for providing said final single recognition result in response to the recognition of a character more than a predetermined number of times.

4. An optical character reading system as defined in claim 1, wherein said plurality of recognitions are provided during a single movement of said sensor past said character pattern.

5. An optical character reading system in which a character pattern is scanned by a sensor composed of photoelectric elements to recognize said character pattern comprising:

scanner means for scanning said character pattern a plurality of times in a single sweep of said scanner past said character pattern, said scanner means including an optical system, a single sensor and a control and binary-coding circuit;

a line characteristics extracting circuit coupled to an output of said binary-coding circuit;

a partial characteristics extracting circuit coupled to an output of said line characteristics extracting circuit;

a recognition process circuit having an input coupled to an output of said partial characteristics extracting circuit;

a recognition results detecting circuit having an input coupled to an output of said recognition process circuit, a final single recognition result, upon each character being optically recognized a plurality of times at different relative positions of said sensor and character pattern in a single recognition operation, being produced at an output of said recognition results detecting circuit; and

a character area detecting circuit having an input coupled to said output of said control and binary-coding circuit, outputs of said character area detecting circuit being used to control operations of said line characteristics extracting circuit and said recognition results detecting circuit.

6. The optical character reading system of claim 5 wherein said line characteristics extracting circuit comprises a read-only memory.

7. The optical character reading system of claim 6 wherein said partial characteristics extracting circuit comprises a read-only memory having first address inputs coupled to outputs of said line characteristics extracting circuit and a register having inputs coupled to outputs of said read-only memory, outputs of said register being coupled to second address inputs of said read-only memory of said partial characteristics extracting circuit.

8. The optical character reading system of claim 7 wherein said recognition process circuit comprises a read-only memory having first address inputs coupled to outputs of said register of said partial characteristics extracting circuit and a register, said register having inputs coupled to outputs of said read-only memory of said recognition process circuit and having outputs coupled to second address inputs of said read-only memory of said recognition process circuit.

9. The optical character reading system of claim 8 wherein said recognition results detecting circuit comprises a microprocessor.

10. The optical character reading system of any one of claims 5-9 wherein said character area detector comprises a plurality of OR gates having one input of each gate coupled to receive a single line output signal from said control and binary-coding circuit, a register, and a read-only memory, each input of said register being coupled to a corresponding output of one of said OR gates and outputs of said register being coupled to address inputs of said read-only memory and to corresponding second inputs of each of said corresponding OR gates.