GB1386604A - Automatic colour correcting system - Google Patents
Automatic colour correcting systemInfo
- Publication number
- GB1386604A GB1386604A GB1837171A GB1837171A GB1386604A GB 1386604 A GB1386604 A GB 1386604A GB 1837171 A GB1837171 A GB 1837171A GB 1837171 A GB1837171 A GB 1837171A GB 1386604 A GB1386604 A GB 1386604A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- red
- circuit
- green
- black
- 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.)
- Expired
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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Color Television Image Signal Generators (AREA)
Abstract
1386604 Colour television BRITISH BROADCASTING CORP 12 June 1972 [1 June 1971] 18371/71 Heading H4F The black and white levels of the red, green, blue colour video signals from a television camera or telecine apparatus are adjusted to remove errors in the signals. The black levels are set using clamp circuits 28 controlled by corrector 20 receiving the output signals via feedback loop 18. Corrector 20 may operate in each field to set the black level of the green signal equal to areference level, the black levels of the red and blue signals then being made equal to the black level of the green signal. A variable gain amplifier 26 in the green channel is adjusted in each field by a circuit 22 to make the maximum value of the largest of the three colour signals equal to a predetermined value, variable gain amplifiers 26 for the red and blue signals being controlled by an "integrate to grey" circuit 24 so as to make the time integrals of the red, green and blue signals equal. Circuit 22 may control all three variable gain amplifiers 26, in which case "integrate to grey" circuit 24 may be omitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1837171A GB1386604A (en) | 1971-06-01 | 1971-06-01 | Automatic colour correcting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1837171A GB1386604A (en) | 1971-06-01 | 1971-06-01 | Automatic colour correcting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1386604A true GB1386604A (en) | 1975-03-12 |
Family
ID=10111324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1837171A Expired GB1386604A (en) | 1971-06-01 | 1971-06-01 | Automatic colour correcting system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1386604A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4136360A (en) * | 1975-10-14 | 1979-01-23 | Dr. Ing. Rudolf Hell Gmbh | Apparatus including a circuit arrangement for adjusting the color signal levels of a white dot |
| US4608595A (en) * | 1983-04-19 | 1986-08-26 | Fuji Photo Film Co., Ltd. | White balance correction for negative-to-positive conversion |
-
1971
- 1971-06-01 GB GB1837171A patent/GB1386604A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4136360A (en) * | 1975-10-14 | 1979-01-23 | Dr. Ing. Rudolf Hell Gmbh | Apparatus including a circuit arrangement for adjusting the color signal levels of a white dot |
| US4608595A (en) * | 1983-04-19 | 1986-08-26 | Fuji Photo Film Co., Ltd. | White balance correction for negative-to-positive conversion |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |