GB2015294A - Noise reduction in colour television signals - Google Patents
Noise reduction in colour television signalsInfo
- Publication number
- GB2015294A GB2015294A GB7844884A GB7844884A GB2015294A GB 2015294 A GB2015294 A GB 2015294A GB 7844884 A GB7844884 A GB 7844884A GB 7844884 A GB7844884 A GB 7844884A GB 2015294 A GB2015294 A GB 2015294A
- Authority
- GB
- United Kingdom
- Prior art keywords
- video
- incoming
- difference
- motion
- exceeds
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Picture Signal Circuits (AREA)
Abstract
A noise-reduced video output signal 22 has contributions both from the incoming video 10 and from stored video 11 representing the video which arrived one frame or field earlier. The relative contributions of the incoming and stored video vary 54 according to the difference 46 between them, i.e. the motion in the picture, provided that the difference exceeds a preset threshold 50 selected to exclude differences due to noise. To prevent chrominance phase noise which exceeds the threshold from being interpreted as motion the chrominance component is removed either from the incoming and stored signals by filtering, 24, 26, 28 and 32, 34, 36, or from the difference signal. If the difference of the incoming and stored video exceeds a higher preset threshold 72, indicating a large degree of motion, the output video 22 consists of the incoming video alone. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US88128478A | 1978-02-27 | 1978-02-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2015294A true GB2015294A (en) | 1979-09-05 |
GB2015294B GB2015294B (en) | 1982-06-23 |
Family
ID=25378151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7844884A Expired GB2015294B (en) | 1978-02-27 | 1978-11-17 | Noise reduction in colour television signals |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS54115018A (en) |
CA (1) | CA1106058A (en) |
DE (1) | DE2845591C2 (en) |
FR (1) | FR2418594A2 (en) |
GB (1) | GB2015294B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4242705A (en) * | 1978-09-21 | 1980-12-30 | Sony Corporation | Noise reduction system for video signals |
GB2139037A (en) * | 1983-03-11 | 1984-10-31 | British Broadcasting Corp | Measuring the amount of unsteadiness in video signals derived from cine film |
US4680638A (en) * | 1982-07-16 | 1987-07-14 | British Broadcasting Corporation | Concealment of defects in a video signal |
EP0242935A1 (en) * | 1986-01-17 | 1987-10-28 | Rca Licensing Corporation | Video signal motion detecting apparatus |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4390894A (en) * | 1980-08-20 | 1983-06-28 | U.S. Philips Corporation | Noise suppression circuit for a video signal |
JPS5914471U (en) * | 1982-07-20 | 1984-01-28 | 日本ビクター株式会社 | Image quality improvement circuit for color video signals |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1306178A (en) * | 1971-06-24 | 1973-02-07 | ||
US3716667A (en) * | 1971-10-26 | 1973-02-13 | Bell Telephone Labor Inc | Apparatus for detecting the moving areas in a video signal |
US4107736A (en) * | 1971-12-20 | 1978-08-15 | Image Transform, Inc. | Noise reduction system for video signals |
US3875584A (en) * | 1973-10-17 | 1975-04-01 | Nasa | Television noise reduction device |
US4032975A (en) * | 1974-02-25 | 1977-06-28 | Mcdonnell Douglas Corporation | Detector array gain compensation |
US4064530A (en) * | 1976-11-10 | 1977-12-20 | Cbs Inc. | Noise reduction system for color television |
-
1978
- 1978-09-21 CA CA311,836A patent/CA1106058A/en not_active Expired
- 1978-10-05 FR FR7828546A patent/FR2418594A2/en active Granted
- 1978-10-19 DE DE19782845591 patent/DE2845591C2/en not_active Expired
- 1978-10-20 JP JP12942378A patent/JPS54115018A/en active Pending
- 1978-11-17 GB GB7844884A patent/GB2015294B/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4242705A (en) * | 1978-09-21 | 1980-12-30 | Sony Corporation | Noise reduction system for video signals |
US4680638A (en) * | 1982-07-16 | 1987-07-14 | British Broadcasting Corporation | Concealment of defects in a video signal |
GB2139037A (en) * | 1983-03-11 | 1984-10-31 | British Broadcasting Corp | Measuring the amount of unsteadiness in video signals derived from cine film |
EP0242935A1 (en) * | 1986-01-17 | 1987-10-28 | Rca Licensing Corporation | Video signal motion detecting apparatus |
Also Published As
Publication number | Publication date |
---|---|
FR2418594B2 (en) | 1985-05-17 |
GB2015294B (en) | 1982-06-23 |
JPS54115018A (en) | 1979-09-07 |
DE2845591C2 (en) | 1982-09-09 |
CA1106058A (en) | 1981-07-28 |
DE2845591A1 (en) | 1979-08-30 |
FR2418594A2 (en) | 1979-09-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |