Patent US3743147A successfully refreshed from Google Patents.
Patent US5099276A successfully refreshed from Google Patents.
US5099276A
Expired / Lapsed
US
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Method of controlling exposure of process camera using sub-exposure and apparatus therefor
Assignee: Dainippon Screen Manufacturing Co Ltd
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Filing: 1991-01-25
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Granted: 1992-03-24
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Expires: 2011-01-25
Abstract
Abstract Disclosed are a method of and an apparatus for controlling exposure in halftone photography by calculating a main exposure amount, a bump exposure amount and a flash exposure amount based on basic data peculiar to the combination of a screen and a photosensitive material original data depending on an original in a process camera. The method includes the steps of preparing the basic data and the original data, obtaining a dot image by exposing the original to a photosensitive material through a screen based on the prepared basic data and original data, defining a resultant dot percentage correction value by obtaining differences between dot percentages of the portions of the obtained dot image which portions corresponding to a highlight region and a shadow region of the original, respectively, and the respective desired values, and correcting at least one of the main exposure amount, the bump exposure amount and the flash exposure amount based on the resultant dot percentage correction value and the basic data. The difference between the dot percentage of the dot image obtained as a result of the exposure and a desired value can be used as a correction value, and therefore, a dot image having a desired dot percentage can be obtained without requiring a difficult procedure of evaluating a correction result.
Inventors
- 👤 Hiroshi Kagosaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:45
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
203 words
A method of controlling exposure of an original to a photosensitive material through a screen by calculating a main exposure amount, a bump exposure amount and a flash exposure amount based on basic data peculiar to the combination of the screen and the photosensitive material and original data depending on the original in a process camera, said basic data including said main exposure amount said bump exposure amount and said flash exposure amount for reproducing a predetermined reference original on said screen with a desired dot percentage, the method comprising the steps of: (a) preparing said basic data and said original data; (b) obtaining a dot image by exposing said original to the photosensitive material through said screen based on said prepared basic data and original data; (c) defining a resultant dot percentage correction value by obtaining differences between dot percentages of the portions of said obtained dot image and the respective desired values, said portions corresponding to a highlight region of said original, and to a shadow region of said original; (d) correcting at least one of said main exposure amount, said bump exposure amount and said flash exposure amount based on said resultant dot percentage correction value and said basic data.
Claim 2
Independent Claim
203 words
A method of controlling exposure of an original to a photosensitive material through a screen by calculating a main exposure amount, a bump exposure amount and a flash exposure amount based on basic data peculiar to the combination of the screen and the photosensitive material and original data depending on the original in a process camera, said basic data including said main exposure amount said bump exposure amount and said flash exposure amount for reproducing a predetermined reference original on said screen with a desired dot percentage, the method comprising the steps of: (a) preparing said basic data and said original data; (b) obtaining a dot image by exposing said original to the photosensitive material through said screen based on said prepared basic data and original data; (c) defining a resultant dot percentage correction value by obtaining differences between dot percentages of the portions of said obtained dot image and the respective desired values, said portions corresponding to a highlight region of said original, and to a shadow region of said original; (d) correcting at least one of said main exposure amount, said bump exposure amount and said flash exposure amount based on said resultant dot percentage correction value and said basic data.
Claim 3
Dependent Claim
45 words
The method of controlling exposure according to claim 1, wherein said basic data includes: basic data for a main exposure, basic data for flash exposure, basic data for bump exposure, basic data for correcting a shadow region, and basic data for correcting a highlight region.
Claim 4
Dependent Claim
62 words
The method of controlling exposure according to claim 2, wherein said original data includes the density of the highlight region of said original and the density of the shadow region of said original, and said step (a) includes the step of measuring the density of the highlight region of said original and measuring the density of the shadow region of said original.
Claim 5
Dependent Claim
115 words
The method of controlling exposure according to claim 3, wherein said step (c) comprises the steps of: measuring a dot percentage of the portion of said obtained dot image, which portion corresponding to the highlight region of said original, defining said resultant dot percentage correction value corresponding to the highlight region by obtaining the difference between said measured dot percentage of said obtained dot image and the desired dot percentage of the portion of said obtained dot image corresponding to the highlight region of said original, recalculating the density of said highlight region included in said original data based on said resultant dot percentage correction value and said basic data for correcting the highlight region.
Claim 6
Dependent Claim
57 words
The method of controlling exposure according to claim 4, wherein said step of recalculating the density of said highlight region includes the steps of: comparing the original range of said original and the screen range of said screen, and recalculating the density of said highlight region according to a predetermined calculations varying depending on said comparison results.
Claim 7
Dependent Claim
109 words
The method of controlling exposure according to claim 5, wherein said predetermined calculation is defined by the equation: where D'.sub.MIN =D.sub.MIN ±K.sub.H ·δ.sub.H D' MIN denotes the density of the highlight region of said original after the correction included in said original data, D MIN denotes the density of the highlight region of said original after the correction included in said original data, K H denotes a predetermined correction coefficient peculiar to the screen and δ H denotes said defined resultant dot percentage correction value with respect to the highlight region, and said correction coefficient K H is determined according to an equation varying depending on said comparison result.
Claim 8
Dependent Claim
109 words
The method of controlling exposure according to claim 3, wherein said step (c) includes the steps of: measuring the dot percentage of said portion of said obtained dot image corresponding to the shadow region of said original, defining said resultant dot percentage correction value corresponding to the shadow region image by obtaining the difference between said measured dot percentage of said obtained dot image and the desired dot percentage of the portion corresponding to the shadow region of said original, recalculating the density of said shadow region included in said original data based on said resultant dot percentage correction value and said basic data for correcting the shadow region.
Claim 9
Dependent Claim
94 words
The method of controlling exposure according to claim 7, wherein said predetermined calculation is defined by the following equation: D'.sub.MAX =D.sub.MAX ±K.sub.S ·δ.sub.S where D' MAX denotes the density of the shadow region of said original after the correction included in said original data, D MAX denotes the density of the shadow region of said original after the correction included in said original data, K S denotes a predetermined correction coefficient for the shadow region peculiar to the screen and δ S denotes said defined resultant dot percentage correction value for the shadow region.
Claim 10
Independent Claim
206 words
An apparatus for controlling exposure of an original to a photosensitive material through a screen by calculating a main exposure amount, a bump exposure amount and a flash exposure amount based on basic data peculiar to the combination of the screen and the photosensitive material and original data depending on the original in a process camera, said basic data including said main exposure amount, said bump exposure amount and said flash exposure amount for reproducing a predetermined reference original on said screen with a desired dot percentage, the apparatus comprising: (a) means for preparing said basic data and said original data; (b) means for obtaining a dot image by exposing said original to the photosensitive material through said screen based on said prepared basic data and original data; (c) means for defining a resultant dot percentage correction value by obtaining differences between dot percentages of the portions of said obtained dot image, respectively, and the respective desired values said portions corresponding to a highlight region and a shadow region of said original; and (d) means for correcting at least one of said main exposure amount, said bump exposure amount and said flash exposure amount based on said resultant dot percentage correction value and said basic data.
Claim 11
Independent Claim
206 words
An apparatus for controlling exposure of an original to a photosensitive material through a screen by calculating a main exposure amount, a bump exposure amount and a flash exposure amount based on basic data peculiar to the combination of the screen and the photosensitive material and original data depending on the original in a process camera, said basic data including said main exposure amount, said bump exposure amount and said flash exposure amount for reproducing a predetermined reference original on said screen with a desired dot percentage, the apparatus comprising: (a) means for preparing said basic data and said original data; (b) means for obtaining a dot image by exposing said original to the photosensitive material through said screen based on said prepared basic data and original data; (c) means for defining a resultant dot percentage correction value by obtaining differences between dot percentages of the portions of said obtained dot image, respectively, and the respective desired values said portions corresponding to a highlight region and a shadow region of said original; and (d) means for correcting at least one of said main exposure amount, said bump exposure amount and said flash exposure amount based on said resultant dot percentage correction value and said basic data.
Claim 12
Dependent Claim
44 words
The apparatus for controlling exposure according to claim 9, wherein said basic data includes: basic data for main exposure, basic data for flash exposure, basic data for bump exposure, basic data for correcting a shadow region, and basic data for correcting a highlight region.
Claim 13
Dependent Claim
63 words
The apparatus for controlling exposure according to claim 10, wherein said original data includes the density of the highlight region of said original and the density of the shadow region of said original, and said means (a) includes means for measuring said density of the highlight region of said original and means for measuring said density of the shadow region of said original.
Claim 14
Dependent Claim
113 words
The apparatus for controlling exposure according to claim 11, wherein said means (c) includes: means for measuring a dot percentage of the portion of the obtained dot image, which portion corresponding to the highlight region of said original, means for defining said resultant dot percentage correction value corresponding to the highlight region by obtaining the difference between said measured dot percentage of said obtained dot image and the desired dot percentage of the portion corresponding to the highlight region of said original, means for recalculating the density of said highlight region included in said original data based on said resultant dot percentage correction value and said basic data for correcting the highlight region.
Claim 15
Dependent Claim
61 words
The apparatus for controlling exposure according to claim 12, wherein said means for recalculating the density of the highlight region includes, means for comparing the original range of said original and the screen range of said screen, and means for recalculating the density of said highlight region according to a predetermined calculation varying depending on an output of said comparing means.
Claim 16
Dependent Claim
109 words
The apparatus for controlling exposure according to claim 13, wherein said predetermined equation is defined by the following equation: D'.sub.MIN =D.sub.MIN ±K.sub.H ·δ.sub.H where D' MIN denotes the density of the highlight region of said original after the correction included in said original data, D MIN denotes the density of the highlight region of said original after the correction included in said original data, K H denotes a predetermined correction coefficient peculiar to the screen and δ H denotes said defined resultant dot percentage correction value corresponding to the highlight region, and said correction coefficient K H is determined according to an equation varying depending on said comparison result.
Claim 17
Dependent Claim
111 words
The apparatus for controlling exposure according to claim 11, wherein said means (c) includes: means for measuring a dot percentage of said portion of said obtained dot image corresponding to the shadow region of said original, means for defining said resultant dot percentage correction value corresponding to the shadow region by obtaining the difference between said measured dot percentage of said obtained dot image and the desired dot percentage of the portion corresponding to the shadow region of said original, means for recalculating the density of said shadow region included in said original data based on said resultant dot percentage correction value and said basic data for correcting the shadow region.
Claim 18
Dependent Claim
93 words
The apparatus for controlling exposure according to claim 15, wherein said predetermined equation determined by the following equation: D'.sub.MAX =D.sub.MAX ±K.sub.S ·δ.sub.S where D' MAX denotes the density of the shadow region of said original after the correction included in said original data, D MAX denotes the density of the shadow region of said original after the correction included in said original data, K S denotes a predetermined correction coefficient for the shadow region peculiar to the screen and δ S denotes said defined resultant dot percentage correction value for the shadow region.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |