EP0440216A2
Expired / Lapsed
EP
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White balance control system
Assignee: Pioneer Corp
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Filing: 1991-01-30
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Granted: —
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Expires: 2011-01-30
Abstract
Abstract Quantity of light of blue projected on a screen is detected. A ratio of the detected quantity of the light to a whole quantity is calculated. The calculated ratio is compared with a reference ratio, and a deviation of the calculated ratio from the reference ratio is corrected so as to provide a white balance.
Inventors
- 👤 Kohsuke C/O Ohmori Koujou Ajima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:46
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A white balance control system for a color television receiver having a red output control circuit, green output control circuit and a blue output control circuit, and projecting means for projecting beams of each color on to a screen comprising: detector means for detecting quantity of at least one color light projected on the screen; calculator means for calculating ratio of the detected quantity of the color light to a whole quantity; a memory storing a reference ratio for obtaining a white balance; comparing means for comparing the calculated ratio with the reference ratio stored in the memory; correcting means for correcting a deviation of the calculated ratio from the reference ratio so as to coincide with the reference ratio; and signal processing means for processing video signals applied to the three output control circuits in accordance with the corrected ratio.
Claim 2
Dependent Claim
53 words
The system according to claim 1 wherein the detector means detects quantity of light including the three colors, and the system further comprising separating means for separating the quantity of the light into respective quantities of the three colors, and the calculator means being arranged to calculate respective ratios of the three colors.
References Cited (Backward Citations)
No citation records indexed.
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