JPS60208170A - White level detecting circuit of picture signal - Google Patents

White level detecting circuit of picture signal

Info

Publication number
JPS60208170A
JPS60208170A JP6211884A JP6211884A JPS60208170A JP S60208170 A JPS60208170 A JP S60208170A JP 6211884 A JP6211884 A JP 6211884A JP 6211884 A JP6211884 A JP 6211884A JP S60208170 A JPS60208170 A JP S60208170A
Authority
JP
Japan
Prior art keywords
white level
picture signal
counter
level data
detecting circuit
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.)
Granted
Application number
JP6211884A
Other languages
Japanese (ja)
Inventor
Yoshikazu Yokoyama
Shunsuke Katahira
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.)
Toshiba Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Toshiba Corp
Nippon Telegraph and Telephone Corp
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 Toshiba Corp, Nippon Telegraph and Telephone Corp filed Critical Toshiba Corp
Priority to JP6211884A priority Critical patent/JPS60208170A/en
Publication of JPS60208170A publication Critical patent/JPS60208170A/en
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To detect a correct white level without being affected by noise by providing a white level data storage means, comparing it with a white level data having an input picture signal data so as to allow the output to decrease or increase the white level.
CONSTITUTION: A white level data of a picture signal is stored in an up-down counter 21. An input picture signal is given to a comparator 32 via a line 24 and compares with the white level data from the counter 21. When the level of the input picture signal is large, the white level of the counter 21 is increased. When the white level data from the counter 21 is larger, the white level data of the counter 21 is decreased. Thus, even when the white level is detected in error due to effect of noise or the like, the correct white level is detected.
COPYRIGHT: (C)1985,JPO&Japio
JP6211884A 1984-03-31 1984-03-31 White level detecting circuit of picture signal Granted JPS60208170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6211884A JPS60208170A (en) 1984-03-31 1984-03-31 White level detecting circuit of picture signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6211884A JPS60208170A (en) 1984-03-31 1984-03-31 White level detecting circuit of picture signal

Publications (1)

Publication Number Publication Date
JPS60208170A true JPS60208170A (en) 1985-10-19

Family

ID=13190819

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6211884A Granted JPS60208170A (en) 1984-03-31 1984-03-31 White level detecting circuit of picture signal

Country Status (1)

Country Link
JP (1) JPS60208170A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62180487A (en) * 1986-02-04 1987-08-07 Fujitsu Ltd Level correcting system
JPS62188470A (en) * 1986-02-13 1987-08-18 Toshiba Corp Picture signal processor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57210774A (en) * 1981-06-19 1982-12-24 Fujitsu Ltd White level follower circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57210774A (en) * 1981-06-19 1982-12-24 Fujitsu Ltd White level follower circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62180487A (en) * 1986-02-04 1987-08-07 Fujitsu Ltd Level correcting system
JPS62188470A (en) * 1986-02-13 1987-08-18 Toshiba Corp Picture signal processor

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