| 摘要 |
A system and method for character presence detection having the capability of locating characters within a line of characters represented by a binary stream of data bits. The stream of binary data bits is divided into scans which correspond to scans of a photocell array. The system for character presence detection receives the binary stream. Each data bit has a unique position within its particular scan, which corresponds to the selection of a particular photocell of the photocell array as the output thereof, and, therefore, the binary stream of data bits comprises an image corresponding to alphanumeric characters disposed upon a written medium. That is, the data bits comprise an image of characters which form a line disposed along a written medium. Within the binary stream, some data bits represent character information and the remainder represents background information. The system compares each scan to a plurality of criterion, each criterion being unique, and forms a series of character segments and spaces based on the results of the comparison of each scan to each of the criterion. The character segments and spaces of one series formed by one of the criterion is selected based on the average number of data bits which contain character information per scan. A recycle number is calculated based on the average number of data bits containing character information per scan, the average scans per character segment, and the standard deviation of the scans comprising the character segments. The recycle number is compared against the character segment which form combined character segments by combining adjacent character segments and the space there between if the combined character is comprised of a number of scans which is less than the recycle number. A new recycle number is calculated based on the combined character segments and this new recycle number is utilized to form new combined character segments from the original character segments. This process continues until the recycle number newly calculated is the same as the prior recycle number calculated. The final combined character segments formed by application of the recycle number are tested against certain limits to detect character segments which were improperly combined. The standard deviation calculated which is based on the combined character segments and the average number of scans per combined character segment is utilized to calculate a suspect character width and minimum and maximum natural break numbers.
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