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US4472037A
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Additive color means for the calibration of stereoscopic projection
Assignee: RealD Inc
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Filing: 1981-08-24
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Granted: 1984-09-18
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Expires: 2001-08-24
Abstract
Abstract Right and left projected image fields of stereoscopic images must have even illumination. If audiences are subjected to uneven illumination intensity of right and left pairs of stereoscopic images, the result for most people will be discomfort. Complimentary colored filters are used in the optical paths of the right and left projected fields, and the resultant additive color mixture is used for evaluation of symmetrical illumination. A means is thus presented for quickly, accurately, and inexpensively calibrating right and left image fields for both equal and even illumination intensity.
Inventors
- 👤 Lenny Lipton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:05
CPC Classifications
G; G03; G03B; G03B35/00; G03B35/18; G03B35/24; G03B43/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
In a stereoscopic projection system which includes the projection of left and right images on a screen, a method of providing uniform illumination of both images across the entire field of the screen comprising the steps of: projecting a complementary first color on the screen to define the left image; projecting a second, different complementary color on the screen to define the right image in a manner such that the combination of the left and right images generate a third color; and adjusting the illumination intensity of portions of the left and right image fields to produce uniformity of the third color over the field thereby achieving uniform illumination intensity of both left and right images across the field.
Claim 2
Dependent Claim
119 words
In a stereoscopic projection system which includes the projection of left and right images on a screen, a method of providing uniform illumination of both images across the entire field of the screen comprising the steps of: projecting a complementary first color on the screen to define the left image; projecting a second, different complementary color on the screen to define the right image in a manner such that the combination of the left and right images generate a third color; and adjusting the illumination intensity of portions of the left and right image fields to produce uniformity of the third color over the field thereby achieving uniform illumination intensity of both left and right images across the field.
Claim 3
Dependent Claim
26 words
A process as recited in claim 1 wherein each projecting steps are carried out by placing a colored filter in the optical path of a projector.
Claim 4
Dependent Claim
28 words
A process as recited in claim 2 wherein one of the filters is red and the other filter is green such that the generated third color is yellow.
Claim 5
Dependent Claim
35 words
A process as recited in claim 1 further comprising the steps of: providing a transparency tinted to the shade of the desired third color; comparing the shade of the transparency to the generated third color.
References Cited (Backward Citations)
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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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |