JPS645168A - Contour compensating circuit - Google Patents

Contour compensating circuit

Info

Publication number
JPS645168A
JPS645168A JP62160123A JP16012387A JPS645168A JP S645168 A JPS645168 A JP S645168A JP 62160123 A JP62160123 A JP 62160123A JP 16012387 A JP16012387 A JP 16012387A JP S645168 A JPS645168 A JP S645168A
Authority
JP
Japan
Prior art keywords
video signal
signal
contour
added
contour compensation
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
JP62160123A
Other languages
Japanese (ja)
Inventor
Satoyuki Ishii
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
Original Assignee
Toshiba 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 filed Critical Toshiba Corp
Priority to JP62160123A priority Critical patent/JPS645168A/en
Publication of JPS645168A publication Critical patent/JPS645168A/en
Pending legal-status Critical Current

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  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To compensate the counter of a video signal with a fine amplitude sufficiently, and to prevent the SN ratio from deteriorating and dot disturbance from increasing by allowing or inhibiting a signal for contour compensation to be or from being added to the video signal while the presence or absence of a noise in the video signal is detected respectively. CONSTITUTION:A second derivative signal for contour compensation is passed through a switch circuit 30, then amplified by an amplifier circuit 31, and added by an adder 32 to the video signal outputted from a delay circuit 24, so that a signal having its emphasized contour appears at an output terminal 33. Here, when a certain picture element is not correlative with any one of picture elements adjoined in its vertical and horizontal direction, it is regarded as a noise and the signal for contour compensation is not added to the video signal, but when at least one picture element is correlative, it is regarded as a noise and the signal for contour compensation is added to the video signal. Consequently, the contour of the video signal with a fine amplitude is compensated sufficiently and deterioration in SN ratio and an increase of dot disturbance due to the contour compensation are precluded.
JP62160123A 1987-06-27 1987-06-27 Contour compensating circuit Pending JPS645168A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62160123A JPS645168A (en) 1987-06-27 1987-06-27 Contour compensating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62160123A JPS645168A (en) 1987-06-27 1987-06-27 Contour compensating circuit

Publications (1)

Publication Number Publication Date
JPS645168A true JPS645168A (en) 1989-01-10

Family

ID=15708363

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62160123A Pending JPS645168A (en) 1987-06-27 1987-06-27 Contour compensating circuit

Country Status (1)

Country Link
JP (1) JPS645168A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560170A2 (en) * 1992-03-09 1993-09-15 THOMSON multimedia Method and apparatus for sharpness enhancement
EP0940977A1 (en) * 1997-08-26 1999-09-08 Matsushita Electric Industrial Co., Ltd. Apparatus for correcting vertical contours

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560170A2 (en) * 1992-03-09 1993-09-15 THOMSON multimedia Method and apparatus for sharpness enhancement
EP0560170A3 (en) * 1992-03-09 1994-01-05 Thomson Consumer Electronics
EP0940977A1 (en) * 1997-08-26 1999-09-08 Matsushita Electric Industrial Co., Ltd. Apparatus for correcting vertical contours
EP0940977A4 (en) * 1997-08-26 2001-04-11 Matsushita Electric Ind Co Ltd Apparatus for correcting vertical contours
US6424383B1 (en) 1997-08-26 2002-07-23 Matsushita Electric Industrial Co., Ltd. Apparatus for correcting vertical contours

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