JPS5586267A - Binary coding unit for output signal of image sensor - Google Patents

Binary coding unit for output signal of image sensor

Info

Publication number
JPS5586267A
JPS5586267A JP16052678A JP16052678A JPS5586267A JP S5586267 A JPS5586267 A JP S5586267A JP 16052678 A JP16052678 A JP 16052678A JP 16052678 A JP16052678 A JP 16052678A JP S5586267 A JPS5586267 A JP S5586267A
Authority
JP
Japan
Prior art keywords
circuit
signal
pulse
comparison reference
image sensor
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
Application number
JP16052678A
Other languages
Japanese (ja)
Inventor
Shinji Miura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP16052678A priority Critical patent/JPS5586267A/en
Publication of JPS5586267A publication Critical patent/JPS5586267A/en
Pending legal-status Critical Current

Links

Landscapes

  • Image Input (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE: To make invariably-accurate decisions of black and white parts of a picture by varying a comparison reference voltage according to variation in the scanning speed of an original reader.
CONSTITUTION: A timing mask signal outputted by a photo detecting diode is amplified by amplifier 11 and then inputted to differentiating circuit 12. Circuit 12 varies a voltage level in accordance with the gradient of the timing mask signal. The peak value of this differential signal is obtained by peak holding circuit 13, sampled and held by sample holding circut 14, and subtracted from a set reference value by subtracter circuit 15 to shift a comparison reference value in level. On the other hand, the timing mask signal is inputted to pulse generating circuit 16 to let a comparator, one-short FF, FF, etc., generate a reset pulse to circuit 13, a sampling pulse to circuit 14, and a transfer pulse to CCD image sensor 17. Further, continuous clock pulses from clock generator 18 are gated to generate a string of transfer pulses. In this way, the set comparison reference signal is compared with the picture signal of the CCD sensor by comparator 19 and converted into binry codes.
COPYRIGHT: (C)1980,JPO&Japio
JP16052678A 1978-12-25 1978-12-25 Binary coding unit for output signal of image sensor Pending JPS5586267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16052678A JPS5586267A (en) 1978-12-25 1978-12-25 Binary coding unit for output signal of image sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16052678A JPS5586267A (en) 1978-12-25 1978-12-25 Binary coding unit for output signal of image sensor

Publications (1)

Publication Number Publication Date
JPS5586267A true JPS5586267A (en) 1980-06-28

Family

ID=15716859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16052678A Pending JPS5586267A (en) 1978-12-25 1978-12-25 Binary coding unit for output signal of image sensor

Country Status (1)

Country Link
JP (1) JPS5586267A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57164657A (en) * 1981-01-02 1982-10-09 Nadoreeru Moruton Image analyzing method and device
DE3601323A1 (en) 1985-01-17 1986-07-17 Ricoh Co., Ltd., Tokio/Tokyo MOVABLE IMAGING DEVICE
JPS61181260A (en) * 1985-02-06 1986-08-13 Matsushita Electric Ind Co Ltd Picture input device
JPS6315659U (en) * 1986-07-16 1988-02-02

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57164657A (en) * 1981-01-02 1982-10-09 Nadoreeru Moruton Image analyzing method and device
DE3601323A1 (en) 1985-01-17 1986-07-17 Ricoh Co., Ltd., Tokio/Tokyo MOVABLE IMAGING DEVICE
JPS61181260A (en) * 1985-02-06 1986-08-13 Matsushita Electric Ind Co Ltd Picture input device
JPS6315659U (en) * 1986-07-16 1988-02-02

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