Patent US5644358A successfully refreshed from Google Patents.
US5644358A
Expired / Lapsed
US
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Automatic white balance adjusting device
Assignee: Intellectual Ventures Fund 83 LLC
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Filing: 1995-11-21
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Granted: 1997-07-01
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Expires: 2015-11-21
Abstract
Abstract An automatic white balance adjusting device adjusts the white balance of a white object which is indoors under the influence of bright sunlight, or a white object which is indoors under the influence of dull sunlight light and a fluorescent lamp. The device includes a weighting circuit for a fluorescent lamp block, and a weighting circuit for a sunlight-and-tungsten-lamp block. The former weights an average of the fluorescent lamp block, while the latter weights an average of the sunlight-and-tungsten-lamp block. The weighted averages are used to generate a white balancing signal, which will be used for white balancing a white object.
Inventors
- 👤 Toshiki Miyano
- 👤 Eiichi Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:13
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
269 words
An automatic white balance adjusting device comprising: (a) a block representative value calculating circuit for dividing a video signal into a plurality of blocks and for calculating representative values of the divided blocks; (b) a fluorescent lamp block average calculating circuit for calculating a fluorescent lamp block average of the representative values of the blocks where the video signal represents a substantially white object under a fluorescent lamp; (c) a sunlight-and-tungsten-lamp block average calculating circuit for calculating a sunlight-and-tungsten-lamp block average of the representative values of the blocks where the video signal represents the substantially white object under bright sunlight and a tungsten lamp; (d) a fluorescent lamp block weighting circuit for receiving the fluorescent lamp block average and object brightness, and multiplying one of a number of fluorescent weighting coefficients, predetermined on the basis of the object brightness, by the fluorescent lamp block average to generate a weighted fluorescent lamp block average; (e) a sunlight-and-tungsten-lamp block weighting circuit for receiving the sunlight-and-tungsten-lamp block average, and multiplying one of a number of daylight weighting coefficients, predetermined on the basis of the sunlight-and-tungsten-lamp block average, by the sunlight-and-tungsten-lamp block average to generate a weighted sunlight-and-tungsten-lamp block average; (f) a white balance adjusting signal calculating circuit for mixing the weighted fluorescent lamp block average and the weighted sunlight-and-tungsten-lamp block average in accordance with a ratio of fluorescent lamp blocks and sunlight-and-tungsten-lamp blocks which are weighted by the fluorescent and daylight weighting coefficients, so as to generate a white balance adjusting signal; and (g) a white balance adjusting circuit for performing white balance adjustment in response to the white balance adjusting signal.
Claim 2
Dependent Claim
269 words
An automatic white balance adjusting device comprising: (a) a block representative value calculating circuit for dividing a video signal into a plurality of blocks and for calculating representative values of the divided blocks; (b) a fluorescent lamp block average calculating circuit for calculating a fluorescent lamp block average of the representative values of the blocks where the video signal represents a substantially white object under a fluorescent lamp; (c) a sunlight-and-tungsten-lamp block average calculating circuit for calculating a sunlight-and-tungsten-lamp block average of the representative values of the blocks where the video signal represents the substantially white object under bright sunlight and a tungsten lamp; (d) a fluorescent lamp block weighting circuit for receiving the fluorescent lamp block average and object brightness, and multiplying one of a number of fluorescent weighting coefficients, predetermined on the basis of the object brightness, by the fluorescent lamp block average to generate a weighted fluorescent lamp block average; (e) a sunlight-and-tungsten-lamp block weighting circuit for receiving the sunlight-and-tungsten-lamp block average, and multiplying one of a number of daylight weighting coefficients, predetermined on the basis of the sunlight-and-tungsten-lamp block average, by the sunlight-and-tungsten-lamp block average to generate a weighted sunlight-and-tungsten-lamp block average; (f) a white balance adjusting signal calculating circuit for mixing the weighted fluorescent lamp block average and the weighted sunlight-and-tungsten-lamp block average in accordance with a ratio of fluorescent lamp blocks and sunlight-and-tungsten-lamp blocks which are weighted by the fluorescent and daylight weighting coefficients, so as to generate a white balance adjusting signal; and (g) a white balance adjusting circuit for performing white balance adjustment in response to the white balance adjusting signal.
Claim 3
Dependent Claim
227 words
An automatic white balance adjustment method comprising the steps of: (a) generating a block representative value by dividing a video signal into a plurality of blocks and calculating representative values of the divided blocks; (b) calculating a fluorescent lamp block average of the representative values of the blocks where the video signal represents a substantially white object under a fluorescent lamp; (c) calculating a sunlight-and-tungsten-lamp block average of the representative values of the blocks where the video signal represents the substantially white object under bright sunlight and a tungsten lamp; (d) generating a weighted fluorescent lamp block average by receiving the fluorescent lamp block average and object brightness, and multiplying one of a number of fluorescent weighting coefficients, predetermined on the basis of the object brightness, by the fluorescent lamp block average; (e) generating a weighted sunlight-and-tungsten-lamp block average by receiving the sunlight-and-tungsten-lamp block average, and multiplying one of a number of daylight weighting coefficients, predetermined on the basis of the sunlight-and-tungsten-lamp block average, by the sunlight-and-tungsten-lamp block average; (f) generating a white balance adjusting signal by mixing the weighted fluorescent lamp block average and the weighted sunlight-and-tungsten-lamp block average in accordance with a ratio of fluorescent lamp blocks and sunlight-and-tungsten-lamp blocks which are weighted by the fluorescent and daylight weighting coefficients and (g) performing the white balance adjustment in response to the white balance adjusting signal.
Claim 4
Dependent Claim
227 words
An automatic white balance adjustment method comprising the steps of: (a) generating a block representative value by dividing a video signal into a plurality of blocks and calculating representative values of the divided blocks; (b) calculating a fluorescent lamp block average of the representative values of the blocks where the video signal represents a substantially white object under a fluorescent lamp; (c) calculating a sunlight-and-tungsten-lamp block average of the representative values of the blocks where the video signal represents the substantially white object under bright sunlight and a tungsten lamp; (d) generating a weighted fluorescent lamp block average by receiving the fluorescent lamp block average and object brightness, and multiplying one of a number of fluorescent weighting coefficients, predetermined on the basis of the object brightness, by the fluorescent lamp block average; (e) generating a weighted sunlight-and-tungsten-lamp block average by receiving the sunlight-and-tungsten-lamp block average, and multiplying one of a number of daylight weighting coefficients, predetermined on the basis of the sunlight-and-tungsten-lamp block average, by the sunlight-and-tungsten-lamp block average; (f) generating a white balance adjusting signal by mixing the weighted fluorescent lamp block average and the weighted sunlight-and-tungsten-lamp block average in accordance with a ratio of fluorescent lamp blocks and sunlight-and-tungsten-lamp blocks which are weighted by the fluorescent and daylight weighting coefficients and (g) performing the white balance adjustment in response to the white balance adjusting signal.
References Cited (Backward Citations)
US4584598A
Cited
US4736241A
Cited
US4989093A
Cited
US5010394A
Cited
JPH057369A
Cited
JPH05292533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-30 | 2000-12-30 | 2001-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-30 | 2004-12-30 | 2005-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-30 | 2008-12-30 | 2009-07-01 | $7700.00 | Window Closed / Lapsed |