US3580995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant sized halftone dot image generator
Assignee: RCA Corp
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Filing: 1968-04-29
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Granted: 1971-05-25
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Expires: 1988-04-29
Abstract
Abstract A halftone image generator that simulates the continuous tones in an original pattern by producing a plurality of visually subliminal halftone dots of substantially the same size, with the coordinate spacings between the halftone dots being made dependent upon the density of the tones in the original pattern.
Inventors
- 👤 Richard J Klensch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:20
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4051
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A system for producing a halftone image of a continuous tone scene comprising in combination; first means for providing a plurality of halftone dots in a two coordinate direction pattern, with each of said halftone dots being of substantially the same predetermined size, second means for varying the spacings between said halftone dots in one of said coordinate directions of said pattern in accordance with the tones in said continuous tone scene and third means for canceling selected ones of said halftone dots in the other coordinate direction of said pattern in accordance with the tones in said continuous tone scene to produce an effective variation in spacings of said halftone dots in said other coordinate direction.
Claim 2
Independent Claim
117 words
A system for producing a halftone image of a continuous tone scene comprising in combination; first means for providing a plurality of halftone dots in a two coordinate direction pattern, with each of said halftone dots being of substantially the same predetermined size, second means for varying the spacings between said halftone dots in one of said coordinate directions of said pattern in accordance with the tones in said continuous tone scene and third means for canceling selected ones of said halftone dots in the other coordinate direction of said pattern in accordance with the tones in said continuous tone scene to produce an effective variation in spacings of said halftone dots in said other coordinate direction.
Claim 3
Dependent Claim
22 words
The combination in accordance with claim 1 wherein said first means includes an imaging device for producing radiation pulses representing halftone dots.
Claim 4
Dependent Claim
55 words
The combination in accordance with claim 2 wherein said second means includes a variable frequency multivibrator for producing substantially identical digital pulses having a repetition rate dependent on the densities of said tones in said continuous tone scene, and gating means for applying said digital pulses to said imaging device to produce said radiation pulses.
Claim 5
Dependent Claim
107 words
The combination in accordance with claim 3 wherein said radiation pulses are derived from a scanning beam produced by said imaging device, and said imaging device includes means for deflecting said scanning beam in said two coordinate direction pattern by a plurality of spaced scan lines. 5. The combination in accordance with claim 4 wherein said third means includes a tone measuring circuit coupled to measure the tones in said continuous tone scene to provide digitized outputs representing the various densities of said tones and means for coupling said digitized outputs to said gating means to control the application of said digital pulses to said imaging device.
Claim 6
Dependent Claim
20 words
The combination in accordance with claim 5 that further includes a counter for counting said scanlines of said imaging device.
Claim 7
Dependent Claim
38 words
The combination in accordance with claim 6 that further includes scanline select means coupled to said counter and said tonal measuring circuit to select one and more scanlines of said imaging device based on said digitized tonal values.
Claim 8
Dependent Claim
60 words
The combination in accordance with claim 7 wherein said digital output pulses are gated to said imaging device only on said selected scanlines to produce radiation pulses having a spatial frequency in one coordinate direction that is dependent on said variable frequency multivibrator and a spatial frequency in the other coordinate direction that is dependent on said tone measuring circuit.
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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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |