JPS6451890A - Video signal processor - Google Patents

Video signal processor

Info

Publication number
JPS6451890A
JPS6451890A JP62209671A JP20967187A JPS6451890A JP S6451890 A JPS6451890 A JP S6451890A JP 62209671 A JP62209671 A JP 62209671A JP 20967187 A JP20967187 A JP 20967187A JP S6451890 A JPS6451890 A JP S6451890A
Authority
JP
Japan
Prior art keywords
video signal
black level
level
minimum
minimum level
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
JP62209671A
Other languages
Japanese (ja)
Inventor
Haruo Yamashita
Yasuki Matsumoto
Kin Nishikawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP62209671A priority Critical patent/JPS6451890A/en
Publication of JPS6451890A publication Critical patent/JPS6451890A/en
Pending legal-status Critical Current

Links

Landscapes

  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To constantly obtain a picture high in a contrast by providing a black level converting means for deciding the black level of a video signal according to the minimum level data of an RGB video signal. CONSTITUTION:A minimum level detecting means 4 for detecting a minimum level in the effective screen of the minimum value of the R, G, B of the video signal, A/D converters 5-8 for A/D converting the video signal and the output signal of the minimum level detecting means 4 and the black level converting means 9-11 for deciding the black level of the video signal according to the minimum level data of the RGB video signal obtained by the A/D converters 5-8 are provided, Then, the black level converting means changes a gain and an offset or the like according to the minimum level data of video data obtained by A/D converting the respective video signals of R, G, B to convert the black level. Thereby, the contrast of a recording picture can be enlarged.
JP62209671A 1987-08-24 1987-08-24 Video signal processor Pending JPS6451890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62209671A JPS6451890A (en) 1987-08-24 1987-08-24 Video signal processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62209671A JPS6451890A (en) 1987-08-24 1987-08-24 Video signal processor

Publications (1)

Publication Number Publication Date
JPS6451890A true JPS6451890A (en) 1989-02-28

Family

ID=16576677

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62209671A Pending JPS6451890A (en) 1987-08-24 1987-08-24 Video signal processor

Country Status (1)

Country Link
JP (1) JPS6451890A (en)

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