Hitachi, Ltd.

Yoshiji Fujimoto

Shozo Kadota

Shigeru Kakumoto

Toshihiro Hananoi

Michio Yasuda

Shinichi Hayashi

Kunihiro Okada

Shunichi Yajima

Mitsunori Oka

Masao Yamamoto

In an apparatus for pattern recognition provided with convertion means for converting a two-dimensional image carried on a picture into pattern signals, memory means for temporally storing the pattern signals from said convertion means, and recognition means for recognizing the pattern signals read out from said memory means, disclosed is a method wherein said picture is divided into a plurality of partial pictures in a manner that adjacent ones of the partial pictures hold in common a partially overlapped region, said convertion means convert, on a one-by-one basis of the partial pictures, the two-dimentional image into pattern signals to be stored in said memory means, and the stored pattern signals are, on a one-by-one basis of the partial pictures, read out to be recognized by said recognition means.

Method of pattern recognition and apparatus thereof

Disclosed is a device for detecting a displacement between patterns comprising a picking-up device, first and second memory means for storing a first and a second patterns picked up by said picking up device, means for shifting said first and second patterns relative to each other thereby obtaining a correlation value for each shift between them, means for obtaining a maximum correlation value and deriving a displacement in terms of the number of shifts which gives said maximum correlation value.

Device for detecting displacement between patterns

A pattern processing system comprising a filtering processor which enhances the edge of a character signal picked up by an image pickup tube, a comparator which binary-codes the character signal on the basis of threshold values of two different levels, a circuit which provides the logical product between outputs from the filtering processor and the comparator, and a filtering processor which subjects the output of the circuit to a filtering processing by the use of a smoothing filter.

Pattern processing system

A pattern segmenting system for a pattern recognizing device, including a pattern memory for storing character information, means for reading out the character information from the pattern memory, means for detecting the start and end points of a subpattern in the character information and for calculating the center of the subpattern in accordance with the start and end points thereof, means for deciding whether or not the center thereof is within a selected character frame, and means for segmenting the subpattern when the center thereof is within the selected character frame and for regarding the frame as a blank when it is not within the selected character frame.

Pattern segmenting system for a pattern recognizing device

In order to recognize confusable characters exactly, a pattern recognition system is described wherein, when more than two reference patterns having a similarity to the input unknown pattern larger than a predetermined threshold level are detected by a first discriminating circuit, one or more suitable feature comparators are selected from a plurality of feature comparators by the control signals corresponding to the reference patterns or the category thereof detected by the first discriminating circuit and the selected one or more feature comparators determine the identity of the input unknown pattern by comparing selected features thereof to the corresponding portions of the plural reference patterns under consideration.

Pattern recognition system

Character recognition apparatus which converts two dimensional feature information derived from an unknown character into one dimensional feature information, such as a code train, and recognizes the unknown character by comparing the converted one dimensional feature information with corresponding information relating to selected reference characters. The starting point of the one dimensional feature information representing the unknown character is selected by scanning the terminal points of the unknown character in a direction predetermined for each particular reference character as indicated by a scan parameter stored with the one dimensional feature information of the reference character. The starting point is then selected on the basis of a relationship including the scan parameter of the reference character and the feature points of the unknown character.

Character recognition apparatus

A character pattern recognition system is disclosed in which an unknown input pattern of character and a standard pattern of character are described and maintained in the form of a sequence of Freeman direction codes. One-to-multiple and multiple-to-one correspondence is permitted between the codes, to obtain a specific correspondence between them in which the sum of the difference between direction codes is minimum, so that the minimum value of code difference is used as a measure of determining the similarity between the two patterns.

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Hachioji, Japan

Yoshiji Fujimoto