Patent US6442294B1 successfully refreshed from Google Patents.
US6442294B1
Expired / Lapsed
US
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Digital image processing apparatus with interpolation and adder circuits
Assignee: Panasonic Holdings Corp
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Filing: 1996-07-18
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Granted: 2002-08-27
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Expires: 2016-07-18
Abstract
Abstract Input data is sampled discretely by a sampling circuit and a cumulative histogram of a plurality of bars is prepared by a cumulative histogram preparing circuit on the basis of the sampled input data. The cumulative histogram is latched by a latch circuit for three vertical scanning periods. Bar values of the cumulative histogram are used by an interpolation circuit to perform contrast conversion of the input data. A gamma circuit applies the gamma characteristic to the data subject to the contrast conversion. An output of the gamma circuit and the input data are inputted to an adder circuit so as to be added and averaged at a predetermined ratio.
Inventors
- 👤 Masato Nishizawa
- 👤 Kenji Tabei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:41
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/20; H; H04; H04N; H04N5/00; H04N5/14; H04N5/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
87 words
A digital image processing apparatus comprising: cumulative histogram preparing means for receiving input data and preparing a cumulative histogram from input data; interpolation means for performing contrast conversion of the input data by using the cumulative histogram prepared by said cumulative histogram preparing means to produce contrast converted data; and adder means for receiving (a) the contrast converted data from said interpolation means and (b) the input data and for adding and averaging the received contrast converted data and the received input data at a predetermined ratio.
Claim 2
Dependent Claim
87 words
A digital image processing apparatus comprising: cumulative histogram preparing means for receiving input data and preparing a cumulative histogram from input data; interpolation means for performing contrast conversion of the input data by using the cumulative histogram prepared by said cumulative histogram preparing means to produce contrast converted data; and adder means for receiving (a) the contrast converted data from said interpolation means and (b) the input data and for adding and averaging the received contrast converted data and the received input data at a predetermined ratio.
Claim 3
Dependent Claim
32 words
A digital image processing apparatus according to claim 1 further comprising sampling means for sampling the input data discretely and supplying the discretely sampled input data to said cumulative histogram preparing means.
Claim 4
Dependent Claim
32 words
A digital image processing apparatus according to claim 1 further comprising gamma correction means interposed between said interpolation means and said adder means for applying gamma correction to the contrast converted data.
Claim 5
Dependent Claim
38 words
A digital image processing apparatus according to claim 3 further comprising sampling means for sampling the input data discretely to produce discretely sampled input data and supplying the discretely sampled input data to said cumulative histogram preparing means.
Claim 6
Dependent Claim
43 words
A digital image processing apparatus according to claim 1 further comprising latch means interposed between said cumulative histogram preparing means and said interpolation means for holding the cumulative histogram prepared by said cumulative histogram preparing means for one or more vertical scanning periods.
Claim 7
Dependent Claim
32 words
A digital image processing apparatus according to claim 5 further comprising sampling means for sampling the input data discretely and supplying the discretely sampled input data to said cumulative histogram preparing means.
Claim 8
Dependent Claim
32 words
A digital image processing apparatus according to claim 6 further comprising gamma correction means interposed between said interpolation means and said adder means for applying gamma correction to the contrast converted data.
Claim 9
Dependent Claim
32 words
A digital image processing apparatus according to claim 5 further comprising gamma correction means interposed between said interpolation means and said adder means for applying gamma correction to the contrast converted data.
Claim 10
Dependent Claim
43 words
A digital image processing apparatus according to claim 1 further comprising image memory means for delaying the input data by one vertical scanning period to produce delayed input data and supplying the delayed input data to said interpolation means and said adder means.
Claim 11
Dependent Claim
38 words
A digital image processing apparatus according to claim 9 further comprising sampling means for sampling the input data discretely to produce discretely sampled input data and supplying the discretely sampled input data to said cumulative histogram preparing means.
Claim 12
Dependent Claim
31 words
A digital image-processing apparatus according to claim 10 further comprising gamma correction means interposed between said interpolation means and said adder means for applying gamma correction to the contrast converted data.
Claim 13
Dependent Claim
32 words
A digital image processing apparatus according to claim 9 further comprising gamma correction means interposed between said interpolation means and said adder means for applying gamma correction to the contrast converted data.
Claim 14
Dependent Claim
36 words
A digital image processing apparatus according to claim 9 further comprising latch means interposed between said cumulative histogram preparing means and said interpolation means for holding the cumulative histogram preparing means for one vertical scanning period.
Claim 15
Dependent Claim
38 words
A digital image processing apparatus according to claim 13 further comprising sampling means for sampling the input data discretely to produce discretely sampled input data and supplying the discretely sampled input data to said cumulative histogram preparing means.
Claim 16
Dependent Claim
32 words
A digital image processing apparatus according to claim 14 further comprising gamma correction means interposed between said interpolation means and said adder means for applying gamma correction to the contrast converted data.
Claim 17
Dependent Claim
32 words
A digital image processing apparatus according to claim 13 further comprising gamma correction means interposed between said interpolation means and said adder means for applying gamma correction to the contrast converted data.
Claim 18
Dependent Claim
30 words
A digital image processing apparatus according to claim 1 , wherein said adder means comprises means for performing an arithmetic average of the contrast converted data and the input data.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-08-26 | 2006-02-25 | 2006-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-08-26 | 2010-02-25 | 2010-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-08-26 | 2014-02-25 | 2014-08-27 | $7700.00 | Window Closed / Lapsed |