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US5210600A
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US
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Extraction of film image parameters in image processing apparatus
Assignee: Fujifilm Business Innovation Corp
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Filing: 1991-01-03
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Granted: 1993-05-11
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Expires: 2011-01-03
Abstract
Abstract An imaging unit including a line sensor reads a film image to produce color decomposition data by scanning a plurality of lines on the film image in a stepped prescanning operation. During the prescanning operation, the color decomposition data of a plurality of pixels at each of a plurality of sampling points are sampled and added up on a line-by-line basis, and the added color decomposition data are averaged, where corrections including a shading correction are performed concurrently with the adding and averaging operations. During a period of from the end of the prescanning operation to the start of a main scanning operation, on the basis of the averaged color decomposition data, a density correction amount is determined and parameters to be used for correcting the film image in a succeeding actual image processing operation are calculated. The calculated parameters are set in a line memory.
Inventors
- 👤 Kunio Hirata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:33
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/62; H04N1/622
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
An image processing apparatus comprising: image reading means for reading an image of a film to produce color decomposition data by scanning a plurality of lines on the film image in a stepped prescanning operation; memory means; and parameter extracting and setting means for, during the prescanning operation, sampling and adding the color decomposition data of a plurality of pixels at each of a first plurality of sampling points on a line-by-line basis and averaging the added color decomposition data, corrections including a shading correction being performed concurrently with the adding and averaging of the color decomposition data, and for, during a period of from an end of the prescanning operation to a start of a main scanning operation, from the averaged color decomposition data, determining a density correction amount and responsive to said density correction amount calculating parameters to be used for correcting the film image in a succeeding actual image processing operation, and setting the calculated parameters in the memory means.
Claim 2
Dependent Claim
163 words
An image processing apparatus comprising: image reading means for reading an image of a film to produce color decomposition data by scanning a plurality of lines on the film image in a stepped prescanning operation; memory means; and parameter extracting and setting means for, during the prescanning operation, sampling and adding the color decomposition data of a plurality of pixels at each of a first plurality of sampling points on a line-by-line basis and averaging the added color decomposition data, corrections including a shading correction being performed concurrently with the adding and averaging of the color decomposition data, and for, during a period of from an end of the prescanning operation to a start of a main scanning operation, from the averaged color decomposition data, determining a density correction amount and responsive to said density correction amount calculating parameters to be used for correcting the film image in a succeeding actual image processing operation, and setting the calculated parameters in the memory means.
Claim 3
Dependent Claim
41 words
The apparatus according to claim 1, wherein the corrections performed by the parameter extracting and setting means during the prescanning operation includes an offset and density adjustment and an orange mask correction in accordance with a negative/positive type of the film.
Claim 4
Dependent Claim
90 words
The apparatus according to claim 1, wherein the parameter extracting and setting means converts the averaged color decomposition data into hue/density data, calculates first block density data of respective first blocks each consisting of a second plurality of the sampling points on the basis of the hue/density data, makes a color area judgment as to whether each block density data belongs to a gray area, a colored area or a skin color area, and determines the density correction amount on the basis of a result of the color area judgment.
Claim 5
Dependent Claim
38 words
The apparatus according to claim 3, wherein the parameter extracting and setting means limits the density correction amount in accordance with a number of the first blocks whose first block density data belong to the skin color area.
Claim 6
Dependent Claim
88 words
The apparatus according to claim 1, wherein the parameter extracting and setting means calculates second block density data of respective second blocks each consisting of a third plurality of the sampling points, judges a degree of exposure and a degree of contrast by calculating a maximum and a minimum, an average and a deviation of the second block density data, and differences within the second block density data, and determines the density correction amount on the basis of a result of the judgment on the exposure and contrast.
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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) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |