GB1345054A - - Google Patents
Info
- Publication number
- GB1345054A GB1345054A GB4239871A GB4239871A GB1345054A GB 1345054 A GB1345054 A GB 1345054A GB 4239871 A GB4239871 A GB 4239871A GB 4239871 A GB4239871 A GB 4239871A GB 1345054 A GB1345054 A GB 1345054A
- Authority
- GB
- United Kingdom
- Prior art keywords
- character
- signals
- fed
- background
- bridges
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/16—Image preprocessing
- G06V30/162—Quantising the image signal
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
Landscapes
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Character Input (AREA)
Abstract
1345054 Character recognition systems ARTHUR KLEMT KG 10 Sept 1971 [10 Sept 1970] 42398/71 Heading G4R To reduce the effects of changes in contrast and background brightness of a character field scanned by a character recognition system at least one photo-cell is employed to view an area of the background in which no part of characters to be recognized ever appears. The signal from this cell, representing the background, is subtracted from each of the output signals of a matrix of photo-cells which view the character field. The difference signals are fed to respective resistance bridges and to an adder which forms the sum of the difference signals. The sum signal is fed to the other arm of the bridges. The signals fed to the bridges are processed in a known way to provide signals indicative of the character. If the scanned character agrees with the characteristics of a standard character one of the character-indicating signals lies within certain limits. The signals are fed to a comparator for comparison with the sum signal, the comparator output indicating the character. Instead of a single cell viewing the background several cells may be used, the average of their outputs being subtracted from the matrix outputs.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702044795 DE2044795B2 (en) | 1970-09-10 | 1970-09-10 | PROCESS FOR REDUCING OR ELIMINATING THE INFLUENCE OF DIFFERENCES IN CONTRAST AND BACKGROUND BRIGHTNESS ON THE CLASSIFICATION OF CHARACTERS DURING SCREEN DRIVING AND DEVICE FOR PERFORMING THE PROCESS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1345054A true GB1345054A (en) | 1974-01-30 |
Family
ID=5782071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4239871A Expired GB1345054A (en) | 1970-09-10 | 1971-09-10 |
Country Status (8)
| Country | Link |
|---|---|
| CA (1) | CA941969A (en) |
| CH (1) | CH534395A (en) |
| DD (1) | DD95476A1 (en) |
| DE (1) | DE2044795B2 (en) |
| FR (1) | FR2107322A5 (en) |
| GB (1) | GB1345054A (en) |
| NL (1) | NL7112496A (en) |
| SE (1) | SE385160B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7604987A (en) * | 1976-05-11 | 1977-11-15 | Bell Telephone Mfg | SIGNAL VALUATION EQUIPMENT. |
| GB2054927B (en) * | 1979-07-20 | 1984-01-11 | Sumitomo Electric Industries | Binary coding circuit |
-
1970
- 1970-09-10 DE DE19702044795 patent/DE2044795B2/en active Pending
-
1971
- 1971-08-17 CH CH1203071A patent/CH534395A/en not_active IP Right Cessation
- 1971-09-06 FR FR7132152A patent/FR2107322A5/fr not_active Expired
- 1971-09-09 SE SE7111440A patent/SE385160B/en unknown
- 1971-09-09 DD DD157649A patent/DD95476A1/xx unknown
- 1971-09-09 CA CA122,480A patent/CA941969A/en not_active Expired
- 1971-09-10 GB GB4239871A patent/GB1345054A/en not_active Expired
- 1971-09-10 NL NL7112496A patent/NL7112496A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DD95476A1 (en) | 1973-02-12 |
| NL7112496A (en) | 1972-03-14 |
| DE2044795B2 (en) | 1972-02-03 |
| CA941969A (en) | 1974-02-12 |
| DE2044795A1 (en) | 1972-02-03 |
| FR2107322A5 (en) | 1972-05-05 |
| CH534395A (en) | 1973-02-28 |
| SE385160B (en) | 1976-06-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |