Hitachi, Ltd.

Toshimi Mifune

Hiroshi Shojima

Junko Mori

Soshiro Kuzunuki

Yasushi Fukunaga

Masaki Miura

Toshihiko Matsuda

Toshio Takekoshi

Yasuo Morooka

A hand-written character recognition apparatus with a personal dictionary preparation function has a character recognition unit for comparing an input hand-written character data with a registered standard dictionary to recognize a most similar character pattern, and a display unit for selecting and displaying a display font corresponding to the recognized character pattern, so that a personal peculiar character or simplified character inputted can be recognized. When a personal dictionary is to be registered, the character to be registered is inputted by hand-writing, the character recognition unit compares the input hand-written character data with the standard dictionary to recognize a similar character pattern, and the recognized character code of the standard dictionary is selected as the character code to be registered. When the personal dictionary is to be prepared, a personal pattern input frame which permits simultaneous input of a plurality of personal hand-written character patterns is provided, and the input personal patterns are allotted to one character code to be registered. When the personal character pattern is to be prepared and registered, similarity between the input personal pattern and the registered dictionary pattern is checked, a stability index indicating a degree of stability of recognition of the personal pattern is calculated based on the similarity, and the stability index is displayed.

Hand-written character recognition apparatus with a personal dictionary

A pattern recognizing device is disclosed, in which the pattern recognition is effected by classifying all the parts of a stroke of an inputted pattern into three groups, those which are clearly arcs, those being clearly segments of line and those which are ambiguous, for which it is not possible to determine whether they are arcs or segments of line; forming a plurality of patterns of stroke structure, each of which is represented by data of a series of elements, which are arcs or segments of line, i.e. by a pattern consisting of those elements for each of the cases where it is supposed that each of the ambiguous parts is an arc or a segment of line, without interpreting it to be an arc or a segment of line; comparing each of the patterns of stroke structure thus obtained with a pluarlity of thesaurus patterns of stroke structure previously registered in a memory; checking the similarity of the structure or the similarity of every smoothly curved or straight part; and selecting a registered pattern having the greatest similarity.

Pattern recognizing device

A plurality of handwritten character input buffers are provided to form a circular buffer by connecting both end character input buffers. The circular buffer is provided with a cursor pointer for indicating the position of the buffer where a recognized character is loaded. Every time a character is recognized, its character code is loaded at the buffer indicated by the content of the cursor pointer and thereafter, the content of the cursor pointer is incremented by 1. At least an input buffer after the buffer indicated by the content of the cursor pointer, where a handwritten character is next written, is cleared. Then, the content of the character input buffer is displayed on a display.

Real time handwritten character input system

A handwritten pattern approximated to a series of polygonal lines consisting of segments is compared with a candidate pattern selected from dictionary patterns stored in the memory, basing on the angular variation between adjacent segments of both patterns. If the difference between angular variations of adjoining segments of both patterns is outside of a certain range, it is tested whether the difference between an angular variation across three or more consecutive segments and the above reference angular variation is within the range.

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Hitachi, Japan

Toshimi Mifune