JPH01119264U - - Google Patents
Info
- Publication number
- JPH01119264U JPH01119264U JP1366288U JP1366288U JPH01119264U JP H01119264 U JPH01119264 U JP H01119264U JP 1366288 U JP1366288 U JP 1366288U JP 1366288 U JP1366288 U JP 1366288U JP H01119264 U JPH01119264 U JP H01119264U
- Authority
- JP
- Japan
- Prior art keywords
- image
- gradation
- photoelectric conversion
- conversion element
- element array
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009825 accumulation Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
Description
第１図は、本考案の一実施例のブロツク図、第
２図は、同動作フローチヤートである。
１……電荷蓄積型光電変換素子アレイ、２……
Ａ／Ｄ変換器、３……デイジタルコンパレータ、
４……蓄積時間制御部、５……しきい値選択回路
、６……画像検知部、７……デイザパターン発生
回路、８……固定しきい値発生回路。
FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart of the same operation. 1...Charge storage type photoelectric conversion element array, 2...
A/D converter, 3...digital comparator,
4... Accumulation time control section, 5... Threshold selection circuit, 6... Image detection section, 7... Dither pattern generation circuit, 8... Fixed threshold generation circuit.
Claims (1)
変換素子アレイで受け、２階調読取と多階調読取
の機能を備えた画像読取装置において、原稿が２
階調画像か多階調画像かを検知する画像階調検知
部と、この画像階調検知部からの検知信号により
前記電荷蓄積型光電変換素子アレイの電荷蓄積時
間を制御する蓄積時間制御部とを設けたことを特
徴とする画像読取装置。 In an image reading device that receives reflected light from an illuminated original with a charge storage type photoelectric conversion element array and has two-tone reading and multi-tone reading functions, the original is
an image gradation detection section that detects whether the image is a gradation image or a multi-gradation image; and an accumulation time control section that controls the charge accumulation time of the charge accumulation type photoelectric conversion element array based on the detection signal from the image gradation detection section. An image reading device characterized by being provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1366288U JPH01119264U (en) | 1988-02-05 | 1988-02-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1366288U JPH01119264U (en) | 1988-02-05 | 1988-02-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01119264U true JPH01119264U (en) | 1989-08-11 |
Family
ID=31224160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1366288U Pending JPH01119264U (en) | 1988-02-05 | 1988-02-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01119264U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59221072A (en) * | 1983-05-31 | 1984-12-12 | Hitachi Ltd | Facsimile equipment |
-
1988
- 1988-02-05 JP JP1366288U patent/JPH01119264U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59221072A (en) * | 1983-05-31 | 1984-12-12 | Hitachi Ltd | Facsimile equipment |