JPS59147367U

JPS59147367U - Image reading device

Info

Publication number: JPS59147367U
Application number: JP4148783U
Authority: JP
Inventors: 片平　俊介
Original assignee: 株式会社東芝
Priority date: 1983-03-23
Filing date: 1983-03-23
Publication date: 1984-10-02

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例における画像読取装置のブロ
ック構成図、第２図は同装置の如部を示す回路構成図、
第３図〜第５図は第１図に示した装置で使用される信号
のタイミング図、第６図および第７図は第１図に示した
装置の作用説明に用いるためのタイミング図である。　
　　　　−１・・・読取部、２・・・記憶回路（ＲＡＭ
）、３・・・信号処理回路、３１．３２・・・ラッチ回
路、３３・・・比較器、３４・・・バスドライバ、３５
・・・ドライブクロック発生回路、４・・・補正演算部
、５・・・記憶制御回路。FIG. 1 is a block configuration diagram of an image reading device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram showing some parts of the device.
3 to 5 are timing diagrams of signals used in the device shown in FIG. 1, and FIGS. 6 and 7 are timing diagrams used to explain the operation of the device shown in FIG. 1. .
-1...Reading unit, 2...Storage circuit (RAM)
), 3... Signal processing circuit, 31.32... Latch circuit, 33... Comparator, 34... Bus driver, 35
. . . Drive clock generation circuit, 4 . . . Correction calculation unit, 5 . . . Storage control circuit.

Claims

[Scope of utility model registration request]

Prior to reading and scanning the original, main scanning is performed multiple times while relatively changing the scanning position in the sub-scanning direction with respect to the uniform density surface, and each time an image signal is obtained in these main scannings, this image signal and the memory circuit are stored. The image signal that is stored is subjected to signal processing, the processed image signal is updated and stored in the storage circuit as correction information, and the original reading scanning signal is corrected based on the correction information stored in this storage circuit. In an image reading device, an image signal arriving in a pre-specified small selection period is selected from among one line of image signals obtained by main scanning, and the image signal selected by the end of the non-selection period following the small selection period is selected. and a corresponding image signal of one line stored in a storage circuit, the processed image signal is updated and stored in the storage circuit, and each operation from the selection to update storage is An image reading device characterized in that the correction information for one line is stored in the storage circuit by performing the scan multiple times while sequentially changing the position of the small selection period in units of scanning.