Communications: electrical – Digital comparator systems
Patent
1978-06-07
1979-01-16
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
G06K 912
Patent
active
041351487
ABSTRACT:
A character presence detector providing a decision on character presence at the data rate, that is the rate at which the character presence detector receives binary data bits. The binary data bits correspond to the output of a self-scanning photocell array and each data bit corresponds to the output of one of the cells of the array. The binary data bits comprise a binary stream which contains information representing characters on a written medium. The stream of binary data bits which is divided into scans corresponding to scans of the photocell array, is received by a memory within the character presence detector. Each binary bit has a unique position within its particular scan. The memory provides as outputs the data bits corresponding to a certain position within each of the scans within the memory simultaneously. Each position within the scans is sequentially selected as the output of the memory. A set of logic devices is connected to receive the data bits provided by the memory and to signal when the data bits having the same position within two adjacent scans contain character information. The output of all logic devices is summed and this sum is transferred to a storage device. The memory also provides outputs of a certain number of binary data bits adjacent within the binary stream to each of a plurality of sets of logic devices. Each set of logic devices of the plurality of logic devices signals when adjacent binary bits contain character information. The output of the plurality of logic devices and the storage device are connected to a column pattern generator and a row pattern generator, respectively. When both the row pattern generator and the column pattern generator indicate the presence of a character, the location of the character is provided to the remainder of the character recognition system.
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patent: 4034343 (1977-07-01), Wilmer
Rohland, "Dynamic Scan Centering", IBM Tech Disclosure Bulletin, vol. 9, No. 1, Jun. 1966, pp. 62-63.
Boudreau Leo H.
Demond Thomas W.
Recognition Equipment Incorporated
Vandigriff John E.
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