| 摘要 |
1,194,585. Character recognition. COLUMBIA CONTROLS RESEARCH CORP. 11 Aug., 1967 [30 Aug., 1966], No. 36979/67. Heading G4R. A character recognition system for reading characters having either long or short intervals between vertical strokes, scans the character to set a two-state storage means into its two stages in response to strokes and intervals respectively, selected states of the storage means being stored in further storage means to provide a coded representation of the character. In Fig. 1, optical or magnetic sensing at 21 of a character in the CMC7 font (i.e. having a characteristic pattern of wide and narrow gaps between seven vertical strokes forming the character) produces pulses at 31, 32 in response to leading and trailing edges of the strokes respectively to set to 1 and 0 (respectively) a flip-flop 35. Setting of flip-flop 35 to 1 pulses one-shot 46 which after a delay equal to half a stroke width produces a shift pulse on line 45 to enter the flip-flop state into a shift register 41. One-shot 48 (having a delay equal to a stroke width plus half a narrow inter-stroke gap) is also pulsed and itself pulses one-shot 49 (having a delay equal to half a stroke width plus half a narrow inter-stroke gap). The output from one-shot 49 produces another shift pluse unless the flip-flop 35 is at 1 at the time. Thus for each narrow gap a 1 is stored in the shift register and for each wide gap 10 is stored. After the end of the character, a one-shot 90 permits a decoder 43 to decode the shift register contents to produce binary and/or decimal indications of the character identity. In the case of optical sensing the photo-cell may control a monostable via an amplifier (and optionally via a bi-stable also), the monostable replacing the flip-flop 35. Reference has been directed by the Comptroller to Specification 1,128,594. |
