GB1324727A – Centre referenced character identification
– Google Patents
GB1324727A – Centre referenced character identification
– Google Patents
Centre referenced character identification
Info
Publication number
GB1324727A
GB1324727A
GB2722271*A
GB2722271A
GB1324727A
GB 1324727 A
GB1324727 A
GB 1324727A
GB 2722271 A
GB2722271 A
GB 2722271A
GB 1324727 A
GB1324727 A
GB 1324727A
Authority
GB
United Kingdom
Prior art keywords
bit
enclosed
signals
scan
white
Prior art date
1970-04-17
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
Application number
GB2722271*A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RECOGNITION TERMINALS Inc
Original Assignee
RECOGNITION TERMINALS Inc
Priority date (The priority date 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 date listed.)
1970-04-17
Filing date
1971-04-19
Publication date
1973-07-25
1971-04-19
Application filed by RECOGNITION TERMINALS Inc
filed
Critical
RECOGNITION TERMINALS Inc
1973-07-25
Publication of GB1324727A
publication
Critical
patent/GB1324727A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
G06V30/22—Character recognition characterised by the type of writing
G06V30/224—Character recognition characterised by the type of writing of printed characters having additional code marks or containing code marks
Abstract
1324727 Character recognition systems RECOGNITION TERMINALS Inc 19 April 1971 [17 April 1970] 27222/71 Heading G4R Printed or hand-written numerals which are to be read by a machine are each impressed on a field having a bar which intersects the character. Fig. 2 shows numeral 2 impressed on a rectangular field having a central bar 13. The field is scanned from left to right in successive vertical strips, the machine operating to determine whether a bit from the scanner is black, or is an enclosed white, i.e. is a white bit lying in an area bounded continuously by the centre bar and the character as are areas 14, 16 or is a non- enclosed white, e.g. as in areas 15, 17. This information, together with other data referred to below, allows the character to be identified. During the scan of a vertical strip of the field the black/white bits from the scanner 10, Fig. 1, are passed to a logic unit 21. As the scan proceeds from top to bottom of the strip this unit performs a first transformation in which each b/w bit in the strip (e.g. 48 bits) is converted to 2-bit form, each such pair indicating whether the b/w bit is (a) back, (b) white but possibly lying in an enclosed area, as indicated by the presence of a black bit above and to the left of the current bit, or (c) white and not enclosed, as indicated by the absence of a black bit above or to the left of the bit. Those bit-pairs are stored in register 24, and in the interval between the end of the scan just completed and the scan of the next strip of the field the bit-pairs are fed back to the logic unit 21. By inspection of the bit-pair lying below each b-type bit pair (possibly enclosed) it is determined whether the b-type pair shall be replaced by a c-type pair (non-enclosed white) or a d-type pair indicating that the bit is totally enclosed. The set of a, c, and d type signals developed following the scan occurring immediately prior to the detection of the centre bar is fed to a register 25. During the scan of the portion of the numeral to the right of the centre bar the signals from the scanner are stored in memory 23. When the end of the field is detected the scan strips are read out in reverse order to logic unit 21, and successive scans are processed as described above to provide a second set of a, c and d type signals to register 26. The two sets of signals represent the respective projections of the left and right portions of the numeral on to the centre bar 13 and indicate the vertical extent of the closed and non-enclosed parts. The registers are associated with circuitry Fig. 7 (not shown) which, for each numeral develops signals on lines LTW7, LTF7 &c. indicating the position of enclosed areas to left and right of the centre bar. These signals pass to recognition logic 41. To accommodate hand-written numerals the recognition logic 41 also receives a signal from unit 35 indicating the maximum number of intersections of the numeral with one of the scan strips to the right of the centre bar. It also receives a signal from unit 27 indicating the number of intersections with the centre bar, and from unit 34 it receives further signals. These signals depend upon the outputs of counters 30- 33 which, for left and right projections, determine the number of black bits above and below the lowest intersection with the centre bar. Unit 34 determines the magnitudes of the ratios of the counter output, and provides signals which eliminate ambiguity which may otherwise exist when scanning numerals 1, 4, 9, or 10.
GB2722271*A
1970-04-17
1971-04-19
Centre referenced character identification
Expired
GB1324727A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US2948570A
1970-04-17
1970-04-17
Publications (1)
Publication Number
Publication Date
GB1324727A
true
GB1324727A
(en)
1973-07-25
Family
ID=21849248
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2722271*A
Expired
GB1324727A
(en)
1970-04-17
1971-04-19
Centre referenced character identification
Country Status (6)
Country
Link
US
(1)
US3651461A
(en)
CA
(1)
CA942424A
(en)
DE
(1)
DE2118791A1
(en)
FR
(1)
FR2089860A5
(en)
GB
(1)
GB1324727A
(en)
NL
(1)
NL7105174A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2191359A
(en)
*
1981-11-27
1987-12-09
Thomson Csf
A recursive method for identifying isotropic zones in a video image; a device for detecting movement and noise in a sequence of images
Families Citing this family (9)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1350200A
(en)
*
1970-11-30
1974-04-18
Plessey Co Ltd
Optical character recognition arrangements
US3868636A
(en)
*
1973-06-18
1975-02-25
Isotec Inc
Optical character reader having feature recognition capability
US4679951A
(en)
*
1979-11-06
1987-07-14
Cornell Research Foundation, Inc.
Electronic keyboard system and method for reproducing selected symbolic language characters
FR2480007B1
(en)
*
1980-04-04
1986-05-30
Sumitomo Electric Industries
OPTICAL CHARACTER READING SYSTEM
US4544276A
(en)
*
1983-03-21
1985-10-01
Cornell Research Foundation, Inc.
Method and apparatus for typing Japanese text using multiple systems
US5097517A
(en)
*
1987-03-17
1992-03-17
Holt Arthur W
Method and apparatus for processing bank checks, drafts and like financial documents
US8620083B2
(en)
*
2004-12-03
2013-12-31
Google Inc.
Method and system for character recognition
CA2700135C
(en)
*
2007-09-18
2015-05-12
Vast Power Portfolio, Llc
Heavy oil recovery with fluid water and carbon dioxide
US9654308B2
(en)
*
2014-11-19
2017-05-16
Intel Corporation
Systems and methods for carrier frequency offset estimation for long training fields
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
NL124767C
(en)
*
1964-01-02
1900-01-01
US3346845A
(en)
*
1964-12-11
1967-10-10
Bunker Ramo
Character recognition method and apparatus
US3500323A
(en)
*
1965-12-06
1970-03-10
Ibm
Handwritten character recognition apparatus
1970
1970-04-17
US
US29485A
patent/US3651461A/en
not_active
Expired – Lifetime
1971
1971-04-14
CA
CA110,287A
patent/CA942424A/en
not_active
Expired
1971-04-16
NL
NL7105174A
patent/NL7105174A/xx
unknown
1971-04-17
DE
DE19712118791
patent/DE2118791A1/en
active
Pending
1971-04-19
GB
GB2722271*A
patent/GB1324727A/en
not_active
Expired
1971-04-19
FR
FR7113758A
patent/FR2089860A5/fr
not_active
Expired
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2191359A
(en)
*
1981-11-27
1987-12-09
Thomson Csf
A recursive method for identifying isotropic zones in a video image; a device for detecting movement and noise in a sequence of images
Also Published As
Publication number
Publication date
NL7105174A
(en)
1971-10-19
CA942424A
(en)
1974-02-19
DE2118791A1
(en)
1971-10-28
US3651461A
(en)
1972-03-21
FR2089860A5
(en)
1972-01-07
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Legal Events
Date
Code
Title
Description
1973-12-05
PS
Patent sealed [section 19, patents act 1949]
1976-11-17
PLNP
Patent lapsed through nonpayment of renewal fees
