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 Title: |
US3761876:
RECOGNITION UNIT FOR OPTICAL CHARACTER READING SYSTEM
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| Country: |
US United States of America
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| Inventor: |
Flaherty, Larry Paul; Dallas, TX
Hale, William Alton; Dallas, TX
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| Assignee: |
Recognition Equipment Incorporated, Dallas, TX
other patents from RECOGNITION EQUIPMENT INCORPORATED (467235) (approx. 145)
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| Published / Filed: |
1973-09-25
/ 1971-07-28
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| Application Number: |
US1971000166802
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| IPC Code: |
Advanced:
G06K 9/36;
G06K 9/62;
G06K 9/80;
Core:
more...
IPC-7:
G06K 9/06;
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| U.S. Class: |
Current:
382/223;
382/272;
382/282;
Original:
340/146.3MA;
340/146.3AG;
340/146.3H;
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| Field of Search: |
340/146.3,146.3 MA,146.3 AG,146.3 H
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| Priority Number: |
| 1971-07-28 |
US1971000166802 |
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| Abstract: |
A recognition unit accepts normalized character data from a multicell, single columnar retina across which a character image is scanned and converts the serial stream of digital character data into a parallel format for each scan and then correlates the data by comparing each cell with a composite of the surrounding cells to establish a black or white digital signal for each cell position. The signals are stored in a matrix array which is vertically analyzed to locate the character dependent cells. The character data is then shifted into a storage matrix and applied to a plurality of digital character masks for selection of the character represented by the data.
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| Attorney, Agent or Firm: |
Richards, Harris & Hubbard ;
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| Primary / Asst. Examiners: |
Wilbur, Maynard R.; Boudreau, Leo H.
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 13 claims |
What is claimed is:
1. A method of correlating the comparative blackness of a data point cell within an array of cells which successively views each of a train of characters to generate a black/white decision signal for said cell comprising the steps of:
- summing signals from a set of cells surrounding the data point cell with the signal from the data point cell;
- biasing said sum in the black sense by a programmable quantity;
- multiplying the signal from the data point cell by the number of cells in said set;
- comparing the biased sum with the multiplied data point cell signal to generate a relative black signal if the cell value sum is the greater;
- generating a programmable absolute black threshold signal;
- comparing the data point cell signal with said absolute black threshold signal to generate an absolute black signal if the cell value signal is the greater;
- generating a black output signal for the data point cell in response to the presence of either a relative black signal or an absolute black signal; and
- generating a white output signal for the data point cell in response to the absence of both a relative black signal and an absolute black signal.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 40 U.S. patent(s) that reference this one
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