JPS5647188A - Picture-quality improving device of color television receiver - Google Patents

Picture-quality improving device of color television receiver

Info

Publication number
JPS5647188A
JPS5647188A JP12462379A JP12462379A JPS5647188A JP S5647188 A JPS5647188 A JP S5647188A JP 12462379 A JP12462379 A JP 12462379A JP 12462379 A JP12462379 A JP 12462379A JP S5647188 A JPS5647188 A JP S5647188A
Authority
JP
Japan
Prior art keywords
color difference
signal
difference signal
luminance signal
polarity
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
JP12462379A
Other languages
Japanese (ja)
Inventor
Yoshio Yasumoto
Tetsuo Tomimoto
Hidekazu Taira
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 JP12462379A priority Critical patent/JPS5647188A/en
Priority to US06/188,478 priority patent/US4316215A/en
Priority to GB8030371A priority patent/GB2062400B/en
Priority to DE3036388A priority patent/DE3036388C2/en
Publication of JPS5647188A publication Critical patent/JPS5647188A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Abstract

PURPOSE:To improve the resolution of a colored picture part by positively mixing the high frequency component of a luminance signal into a color difference signal according to the intensity of the color difference signal. CONSTITUTION:Color difference signal C-Y is inputted from coloring signal source 11 to differentiating circuit 19 for differentiation. Luminance signal Y, on the other hand, is applied to and differentiated by differentiating circuit 20 as well. Differential outputs of differentiating circuits 19 and 20 are inputted to multiplier 21 to output their product. The polarity of its output is positive when transient parts of luminance signal Y and color difference signal C-Y rise or fall in the same direction or negative when in the opposite direction. The circuit method like this, when the luminance signal and color difference signal differ in transient polarity, reduces the amplitude or inverts the polarity of high frequency component YH of the luminance signal applied to variable gain amplifier 17.
JP12462379A 1979-09-26 1979-09-26 Picture-quality improving device of color television receiver Pending JPS5647188A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP12462379A JPS5647188A (en) 1979-09-26 1979-09-26 Picture-quality improving device of color television receiver
US06/188,478 US4316215A (en) 1979-09-26 1980-09-18 System for improving reproduction of images in a color television receiver
GB8030371A GB2062400B (en) 1979-09-26 1980-09-19 Colour television receivers
DE3036388A DE3036388C2 (en) 1979-09-26 1980-09-26 A system for enhancing the sharpness of color television images in a color television set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12462379A JPS5647188A (en) 1979-09-26 1979-09-26 Picture-quality improving device of color television receiver

Publications (1)

Publication Number Publication Date
JPS5647188A true JPS5647188A (en) 1981-04-28

Family

ID=14889993

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12462379A Pending JPS5647188A (en) 1979-09-26 1979-09-26 Picture-quality improving device of color television receiver

Country Status (1)

Country Link
JP (1) JPS5647188A (en)

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