| 摘要 |
<p>1,215,241. Character recognition; core matrix data-stores. INTERNATIONAL STANDARD ELECTRIC CORP. 7 May, 1968 [9 May, 1967], No. 21471/68. Headings G4C and G4R. [Also in Division H3] A character centreing arrangement comprises a plurality of character sensors feeding row wires of a matrix memory, diagonal wires of the matrix feeding a maximum value detector which can block a maximum value detector fed by other diagnonal wires, the detectors selecting a diagonal read-out wire of the matrix to read-out the stored signals on to column wires of the matrix. Referring to Fig. 3, a specially-shaped character having a short or long vertical stroke in a first column thereof is scanned horizontally by a column of 12 photo-diodes, this column being about 3 times the height of the character. The photo-diodes feed respective row wires Z1-Z12 of a magnetic core matrix, the signals from each of the five columns of the character being stored in turn in the whole matrix i.e. each photodiode signal is repeated in every core of its row. In response to the first column of the character, a maximum value detector 10 gives an output on one of 9 lines according to which of 9 diagonal sense wires L1-L9, each threading 4 cores as shown, carries the largest voltage, the voltage on the sense wire indicating the number of set cores threaded by it. If the maximum possible sense line voltage (4 cores set) appears at any input of maximum value detector 10, the latter inhibits a maximum value detector 11 which otherwise indicates which of diagonal sense lines K1-K11, each threading two cores as shown, carries the maximum voltage. Corresponding outputs of the detectors 10, 11 which detect the vertical position of long and short vertical strokes in the first character column respectively, are ORed to set one of flip-flop FF1-FF11 to select one of 11 diagonal read-out wires R1-R11 of the matrix. Each column of the character is read into the matrix in turn, as stated, and then read out using the read-out wire selected in response to the first column, on column wires Q1-Q6. Fig. 5 shows the treatment of the column wire outputs, but assuming 3n photo-diodes where say 3n = 60. The column outputs are stored in flip-flops at 16. The character is considered to be divided into 7 horizontally-extending zones, of which some viz. a, c, e, g, may or may not contain horizontal strokes and the rest viz. b, d, f may or may not contain vertical strokes. At 17, the outputs of the flip-flops in each of zones a, c, e, g are ORed together and those of the flip-flops in each of the other zones are added and then thresholded. -The resulting signals are stored in a 5 Î 7 matrix 18 which feeds diode logic to recognize the character. The outputs of the five matrix cells relating to each of zones a, c, e, g may alternatively be added and then thresholded to recognize a horizontal stroke before feeding the diode logic, or each of these sets of five matrix cells may be replaced by a binary counter, a count of at least 2 indicating a horizontal stroke.</p> |
