Title:
BINARIZATION THRESHOLD VALUE DETERMINING DEVICE
Document Type and Number:
Japanese Patent JP3248965
Kind Code:
B2
Abstract:
PURPOSE: To improve the precision of binarization threshold value determination by inputting the whole density histogram to a neural network.
CONSTITUTION: The binarization threshold value determining device 4 which determines a threshold value for converting a multi-valued image into a binary image as an input image to a character recognizing device 2 by using the neural network 10 provided with a learning function is provided with a means 9 which generates the density histogram from respective pixel values of the multi-valued image, and the neural network 10 is provided with an input layer for inputting frequency values of the density histogram corresponding to respective density values, an output layer which outputs an optimum binarization threshold value for the inputted multi-valued image, and a learning control means which makes the neural network 10 learn by regarding as an error the misrecognition rate of the character recognizing device 2 at the time of binarization using the binarization threshold value calculated by supplying the density histogram to the input layer and using the value outputted from the output layer; and the whole density histogram is inputted to the neural network 10 to determine the binarization threshold value.
Inventors:
Toshio Miyazawa
Hideaki Yamagata
Are eye levin
Hideaki Yamagata
Are eye levin
Application Number:
JP34237192A
Publication Date:
January 21, 2002
Filing Date:
December 22, 1992
Export Citation:
Assignee:
株式会社リコー
International Classes:
G06G7/60; G06N3/00; G06N99/00; G06T1/00; G06F15/18; G06T5/00; G06V30/162; H04N1/40; H04N1/403; G06V30/10; (IPC1-7): G06K9/38; G06N3/00; G06T1/00; G06T5/00
Domestic Patent References:
| JP4297961A | ||||
| JP5328133A |
Other References:
馬場口 他，「コネクショニストモデルによる画像２値化の実験的検討」，電子情報通信学会論文誌Ｄ−ＩＩ，Ｖｏｌ．Ｊ７３−Ｄ−ＩＩ，Ｎｏ．８，ｐｐ．１２８１−１２８７，平成２年８月
Attorney, Agent or Firm:
Akira Kashiwagi (1 person outside)