US6801365B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection type image display system and color correction method thereof
Assignee: Olympus Corp
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Filing: 2002-12-04
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Granted: 2004-10-05
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Expires: 2022-12-04
Abstract
Abstract There is provided a projection type image display system comprising color image displaying means for displaying an image to be projected onto a screen, means for storing a correlation between an initial XYZ-tristimulus value of an image projected onto the screen at the time of initial adjustment and an initial luminance value of the image projected onto the screen at the time of initial adjustment, luminance measuring means for measuring a maximum luminance value of each of primary colors of an image projected onto the screen upon lapse of a predetermined time from the initial adjustment, means for estimating an XYZ-tristimulus value of the image on the screen upon lapse of the predetermined time based on the maximum luminance value and the correlation, and means for calculating a color correction coefficient based on the estimated XYZ-tristimulus value.
Inventors
- 👤 Tomoyuki Nakamura
- 👤 Toru Wada
- 👤 Kensuke Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:20
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/3147; G; G03; G03B; G03B21/00; G03B21/005; G03B21/006; H04N9/3179; H04N9/3182
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
157 words
A color correction method of a projection type image display system which projects an image from color image displaying means onto a screen, the method comprising: a step of measuring an initial XYZ-tristimulus value of an image projected onto the screen at the time of initial adjustment; a step of measuring an initial luminance value of the image projected onto the screen at the time of initial adjustment; a step of obtaining a correlation between the initial XYZ-tristimulus value and the initial luminance value; a step of measuring a maximum luminance value of each of primary colors of an image projected onto the screen upon lapse of a predetermined time from the initial adjustment; a step of estimating an XYZ-tristimulus value of the image on the screen upon lapse of the predetermined time based on the maximum luminance value and the correlation; and a step of calculating a color correction coefficient based on the estimated XYZ-tristimulus value.
Claim 2
Dependent Claim
157 words
A color correction method of a projection type image display system which projects an image from color image displaying means onto a screen, the method comprising: a step of measuring an initial XYZ-tristimulus value of an image projected onto the screen at the time of initial adjustment; a step of measuring an initial luminance value of the image projected onto the screen at the time of initial adjustment; a step of obtaining a correlation between the initial XYZ-tristimulus value and the initial luminance value; a step of measuring a maximum luminance value of each of primary colors of an image projected onto the screen upon lapse of a predetermined time from the initial adjustment; a step of estimating an XYZ-tristimulus value of the image on the screen upon lapse of the predetermined time based on the maximum luminance value and the correlation; and a step of calculating a color correction coefficient based on the estimated XYZ-tristimulus value.
Claim 3
Dependent Claim
134 words
A projection type image display system comprising: color image displaying means for displaying an image to be projected onto a screen; means for storing a correlation between an initial XYZ-tristimulus value of an image projected onto the screen at the time of initial adjustment and an initial luminance value of the image projected onto the screen at the time of initial adjustment; luminance measuring means for measuring a maximum luminance value of each of primary colors of an image projected onto the screen upon lapse of a predetermined time from the initial adjustment; means for estimating an XYZ-tristimulus value of the image on the screen upon lapse of the predetermined time based on the maximum luminance value and the correlation; and means for calculating a color correction coefficient based on the estimated XYZ-tristimulus value.
Claim 4
Dependent Claim
134 words
A projection type image display system comprising: color image displaying means for displaying an image to be projected onto a screen; means for storing a correlation between an initial XYZ-tristimulus value of an image projected onto the screen at the time of initial adjustment and an initial luminance value of the image projected onto the screen at the time of initial adjustment; luminance measuring means for measuring a maximum luminance value of each of primary colors of an image projected onto the screen upon lapse of a predetermined time from the initial adjustment; means for estimating an XYZ-tristimulus value of the image on the screen upon lapse of the predetermined time based on the maximum luminance value and the correlation; and means for calculating a color correction coefficient based on the estimated XYZ-tristimulus value.
Claim 5
Dependent Claim
51 words
The projection type image display system according to claim 2 , wherein the system measures a luminance value by using the luminance measuring means at the end of an operation of the system, and reflects correction based on a measurement result at the start of a next operation of the system.
Claim 6
Dependent Claim
44 words
The projection type image display system according to claim 2 , wherein an image projected onto the screen from the color image displaying means at the end of an operation of the system includes an image for luminance measurement by the luminance measuring means.
Claim 7
Dependent Claim
53 words
The projection type image display system according to claim 2 , wherein a series of images projected onto the screen from the color image displaying means include a predetermined image for luminance measurement by the luminance measuring means, and the luminance measuring means measures a luminance value when the predetermined image is displayed.
Claim 8
Dependent Claim
33 words
The projection type image display system according to claim 2 , wherein a measurement area for the initial XYZ-tristimulus value is substantially the same as a measurement area for the initial luminance value.
Claim 9
Dependent Claim
52 words
The projection type image display system according to claim 2 , wherein the luminance measuring means includes: a plurality of measuring portions; and a plurality of filters each of which is provided at a position corresponding to each of the measuring portions and selectively transmits therethrough light in a specific wavelength band.
Claim 10
Dependent Claim
54 words
The projection type image display system according to claim 2 , wherein the luminance measuring means includes: a measuring portion; a plurality of filters each of which selectively transmits therethrough light in a specific wavelength band; and filter driving means for moving one of the filters to a position corresponding to the measuring portion.
Claim 11
Dependent Claim
67 words
The projection type image display system according to claim 2 , further comprising processing means for processing an input image signal, wherein the processing means includes: separating means for separating the input image signal into image signals of primary colors; lookup tables to which the separated image signals are inputted; and signal generating means for generating an image signal based on output signals of the lookup tables.
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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) | 2007-10-05 | 2008-04-05 | 2008-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-10-05 | 2012-04-05 | 2012-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-10-05 | 2016-04-05 | 2016-10-05 | $7700.00 | Window Closed / Lapsed |